Arid Desert Research Articles

Analysis of spatial-temporal trends and causes of vapor pressure deficit in China from 1961 to 2020

Understanding the spatial-temporal trends and variability of vapor pressure deficit (VPD) is important for promoting climate protection and water management. This study was based on long-term series data of maximum/minimum air temperature (Tmax/Tmin) and relative humidity (RH) from 1740 meteorological stations in China from 1961 to 2020 to jointly analyze the spatial-temporal variation characteristics of VPD at different time scales, climate zones and extreme events and their influencing factor. The results showed an overall highly significant increasing trend in VPD, Tmax, and Tmin, with Sen's slope (SS) values of 0.0178 kPa/decade, 0.22 °C/decade, and 0.32 °C/decade, respectively. The opposite was true for RH (SS = −0.41%/decade). Moreover, the trends all changed abruptly around the year 2000. The VPD exhibited a highly significant upward trend in spring as well as at the junction of climatic zones and along the southeastern coast. This was particularly evident in the semi-arid steppe of Inner Mongolia (IM), the humid tropical south China (SC), and the semi-humid warm-temperate north China (NC) regions. For the frequency distribution of VPD extremes in each climate zone, the arid desert of northwest China (NWC)> > IM > NC. The frequency range was 758–910 days/decade, 249–410 days/decade, and 170–300 days/decade, respectively. Moreover, their average frequency of extreme events was 88 times/decade, 55 times/decade, and 38 times/decade respectively. The main meteorological factors affecting VPD taken together were Tmax, RH, Tmin, sunshine duration (N), and wind speed (U2) with mean importance values of 0.612, 0.351, 0.020, 0.016, and 0.001 respectively. Meanwhile, we found that VPD and reference crop evapotranspiration (ET0) were positively correlated and negatively correlated with soil water content and altitude. The maximum growth rate of VPD was observed in Cropland and Impervious environments. This research reveals the spatial-temporal characteristics of meteorological elements in China and provides a reference for scholars to formulate countermeasures against climate change.

Mechanics and road performance of mudstone modified stabilized gravel subgrade in arid desert areas

This study investigates the feasibility of using mudstone to enhance poorly graded gravel in certain arid regions of the S21 Altay-Urumqi Highway project in Xinjiang. Despite mudstone typically being considered a poor-quality rock, its combination with higher-performance materials like cement, lime, and fly ash can stabilize expansive soils for use as roadbed fill. In the experiments, 30% and 40% mudstone were added to the gravel mixture. The experiments were compared with unmodified K80 and 35% crushed rock mixes. The findings reveal that adding 30% mudstone substantially increased the California Bearing Ratio (CBR) of the gravel mix by over 20%. However, excessive mudstone inclusion could weaken load-bearing capacity. Moreover, mudstone-modified specimens exhibited superior unconfined compressive strength (UCS), splitting strength, compressive resilience modulus (CRM), drying shrinkage resistance, and temperature shrinkage resistance. Under optimum cement dosage, the UCS of mudstone-modified specimens outperformed unmodified specimens, consistently surpassing fly ash-altered groups. Although mixed fly ash initially exhibited lower strength, it gradually approached cement-stabilized strength with an extended curing time. Incorporating crushed stone into the grading curve significantly increased splitting strength due to its high strength and hardness. In contrast, adding mudstone introduced a notable proportion of fine aggregates, resulting in a looser grading skeleton prone to early cracking. This research demonstrates that mudstone enhancement significantly improves roadbed performance, including increased CBR, splitting strength, and crack resistance. The use of mudstone in arid desert areas enhances overall performance while reducing shrinkage coefficients. The suggested approach for semi-rigid pavements in arid deserts recommends specific mineral proportions, various aggregate sizes, an appropriate amount of cement, and 30% mudstone to create dense structures with a higher quantity of coarse aggregate.

Responses of the arbuscular mycorrhizal fungi community to warming coupled with increased drought in an arid desert region

Warming coupled with precipitation changes induced by climate change profoundly affect desert ecosystem functions in global drylands. Arbuscular mycorrhizal fungi (AMF) play a crucial role in such ecosystems by regulating energy and nutrient exchange. However, little is known about how AMF communities respond to warming coupled with reduced precipitation (W + RP). We evaluated the impacts of 0.5 °C and 1.5 °C increase in temperature coupled with 5 % and 8 % reductions in total annual precipitation (0.5 °C W + 5 % RP, 1.5 °C W + 8 % RP) on AMF communities and the main ecological processes structuring AMF community assemblies in the rhizosphere soil of typical winter annual plants in the Tengger Desert, northwest China. The results showed that warming coupled with reduced precipitation could significantly alter the composition, abundance, and diversity of AMF communities. Both AMF biomass and AMF diversity increased in the 0.5 °C W + 5 % RP treatment but decreased in the 1.5 °C W + 8 % RP treatment. The 1.5 °C W + 8 % RP treatment significantly reduced root biomass and the AMF colonization rate but increased the specific root length, indicating a trade-off between fine roots and their symbiotic AMF. The AMF community was phylogenetically random in the 0.5 °C W + 5 % RP treatment but appeared clustered in the 1.5 °C W + 8 % RP treatment, implying that more pronounced warming coupled with reduced precipitation can promote the deterministic assembly of the AMF community. We provide a conceptual framework for comprehending the mechanisms underlying the effects of warming coupled with reduced precipitation on AMF communities, incorporating biological and geochemical processes. Overall, the findings of this study suggest that AMF abundance and diversity and the main ecological processes driving AMF assemblages respond differently to more pronounced compared to less intensive warming coupled with reduced precipitation. Importantly, higher warming coupled with a reduction in precipitation reduced plant dependence on AMF and resulted in stronger environmental filtration by significantly reducing soil water content.

Relict Plants Are Better Able to Adapt to Climate Change: Evidence from Desert Shrub Communities

Shrubs are the main dominant plants in arid desert systems and play an important role in maintaining the biodiversity, ecosystem services and stability of desert ecosystems. Studies have shown that the survival of a large number of shrub species in desert areas under the influence of climate change is significantly threatened, with different species showing different response strategies. To test the tolerance of different shrub species to climate change, this study selected 10 dominant shrub species (ancient relict shrub species and regional endemic shrub species) in the Alashan desert area as the research object. Based on a field survey of species distribution, a species distribution model was developed to simulate the suitable distribution area of shrub species under current conditions and under future climate change scenarios. The distribution changes of ancient relict and regional endemic shrub species under the climate change scenarios were tested, and the tolerance of the two types of shrub to climate change was analyzed. The results showed that under different climate change scenarios, except for Ammopiptanthus mongolicus, the total suitable area of four out of the five relict plants was relatively stable, the potential distribution area of Tetraena mongolica increased, and the future distribution pattern was basically consistent with the current distribution. However, the suitable area of typical desert plants was unstable under different climate change scenarios. Except for Kalidium foliatum, the suitable distribution areas of four out of the five shrubs showed different degrees of reduction, and the distribution location showed significant migration. Based on the research results, climate change will lead to the reduction and displacement of the distribution area of typical desert shrubs, while relict shrubs will be less affected by climate change. This is because, compared to desert species, relict plants have a longer evolutionary history and have developed a wider range of adaptations after experiencing dramatic environmental changes. This study provides a scientific basis for actively responding to the impacts of climate change on desert ecosystems.

Energy-carbon emission nexus in a residential building using BIM under different climate conditions: an application of multi-objective optimization

This study was carried out to investigate the impact of building insulation, a method of reducing energy consumption, on the amount of energy consumed in a building, as well as its impact on cooling and heating loads and carbon emission. A residential structure was designed in Revit, and DesignBuilder determined the cooling and heating loads, as well as the energy consumption. Under three distinct climate conditions, the impact of the environment on the energy-carbon emission nexus of residential buildings was assessed. The cold mountain climate of Koick, Slovakia; the arid desert climate of Ha’il, Saudi Arabia; and the tropical monsoon climate of Borneo, Indonesia were chosen. During the design stage, the Particle Swarm Optimization (PSO) method was used to minimize the energy consumption cost (ECC) and CO2 emissions. Over the course of 24 h, the cooling and heating loads decreased by 2.51 kW and 1.9 kW, respectively. When the two modes in Ha’il were combined, the heating load was reduced to 850 kWh and the cooling load was reduced to 650 kWh, according to the results. In Borneo, the heating load was reduced by 200 kWh, while in Koick, it was reduced by 2,000 kWh. The cooling load was reduced by 550 and 50 kWh in Borneo and Koick, respectively. This system appears to perform better in arid and hot climates in terms of both heating and cooling loads. However, energy losses in the arid and hot climate (Ha’il) are greater than in other climates. This could be due to temperature and humidity differences between the inside and outside. According to the findings of the PSO evolutionary algorithm optimization, the building can be constructed to reduce ECC by 19% by taking into account input characteristics such as Wind-to-Wall Ratio (WWR), wall, glazes, and weather conditions. This research provides useful insights into the practical application of optimization methods for reducing CO2 emissions, paving the way for more sustainable and eco-conscious architectural practices.

The Response of Oxytropis aciphylla Ledeb. Leaf Interface to Water and Light in Gravel Deserts

In arid areas, the scarcity of rainfall severely limits the growth of plants in the area. In arid sandy deserts, plants survive by deeply rooting to absorb groundwater. In arid gravel soil deserts (Gobi), the gravel in the soil layer limits the growth and water absorption of local plant roots. Therefore, the strategies adopted by local plants to obtain water to sustain life have become crucial. Oxytropis aciphylla Ledeb. is a perennial, strongly xerophytic, cushion-shaped semi-shrub plant widely distributed in arid gravel desert areas. Its plant height is relatively short, its crown width is not large, and its root system is also underdeveloped. There are small and curly pinnate compound leaves and dense hairy fibers on the surface of the leaves. In this study, we focused on the function of leaf surface trichomes by observing the leaf submicroscopic structure, conducting in situ water harvesting experiments, measuring reflectance spectra, and analyzing chloroplast genomes of O. aciphylla leaves. The experimental results indicate that the surface of the leaves of O. aciphylla is densely covered with hair-like fiber arrays, and these hair-like fiber surfaces have micro and nanoscale protrusions. These structures can quickly capture moisture in the air and filter out ultraviolet and infrared rays from the sun, without affecting the normal photosynthesis of the chloroplasts inside the leaves. The important findings of this study are the nanostructures on the surface of the hair-like fibers on the leaves of O. aciphylla, which not only have a water capture function but also reflect light. This has important theoretical significance for understanding how plant leaves in gravel deserts adapt to the environment.

Temporal and spatial dynamics and functional metabolism of dark septate endophytes of Gymnocarpos przewalskii Maxim. in Northwest Desert, China

In extreme habitats, plants can survive mutually with their beneficial colony partners. How dark septate endophytes (DSE) assist the relict plant Gymnocarpos przewalskii survive in extremely desert environment and maintain the stability of the ecosystem remains unclear. Studying distribution, seasonal changes and functional physiological responses of DSE colonized in roots of G. przewalskii can help understand symbiosis mechanism of these endophytes associated to relict plants in extremely arid desert environments. DSE colonization, species diversity and soil properties of G. przewalskii were measured in Anxi and Minqin sites, Northwest China in July, September and December 2019. Subsequently, the functional metabolism of DSE strain was measured, and the response of DSE strain to drought stress was performed in vitro. DSE hyphal colonization (23.3 % - 39.2 %) and DSE isolation frequency (6.0 % - 27.6 %) varied sharply among seasons and sites. Soil alkaline phosphatase, nitrate nitrogen and total phosphorus were main factors affecting the DSE composition. Twenty-six DSE isolates produced indole-3-acetic acid (IAA) in the medium, while 50 % of DSE showed a potential for IAA production in L-tryptophan-dependent. Additionally, the composition of functional metabolites of DSE strains varied greatly with different drought levels and DSE isolates, which may indirectly reflect the complementarity between different strains in helping hosts cope with drought stress. This study confirmed the temporal and spatial dynamics and growth-promoting and drought-tolerant potential of DSE community in desert environment, and provided a new perspective for exploring the survival strategy and vegetation protection of desert relict plants.

Experimental study on energy and exergy assessments of a new PV system with a concave cover for active cooling and self-cleaning

Sandstorms and the spread of dust are problems in semi-arid and arid desert regions. The performance of the photovoltaic cells is lowered as a result of dust buildup on their front side and overheating. Through the use of a combined cooling and self-cleaning technique, the overall performance of a solar panel is improved in this experimental study. As a result, the solar panel receives four upgrades: a concave cover, mirrors, constant flow water cooling, and natural flow air cooling. For this purpose, a transparent concave cover is applied to the front side of the photovoltaic cells to allow the greatest amount of solar radiation to pass through while preventing the accumulation of dust on this face. The front face is cooled with water at a constant flow of 0.0042 kg/s and cooled by air to pass between the front face of the solar cell and the concave cover with a natural flow. Mirrors are positioned on the right and left sides to increase solar radiation. The modified PV solar panel module (PV-M) and conventional solar panel module (PV-C) are contrasted in terms of their operating temperature, current, and output voltage. According to the experimental findings, PV-M had a 24.11% increase in electrical efficiency over PV-C under the same operating conditions and at maximum solar radiation. With a 76.51% improvement, the overall average energy efficiency of PV-C and PV-M was calculated to be 23.63 and 41.71%, respectively. in comparison, the average exergy efficiency was about 25.04%.

Rodent disturbances in arid regions drive ephemeral plant diversity but deteriorate soil health

The desert ecosystem is an important ecological barrier to prevent desertification and maintain the stability of arid zone ecosystem and regional security. The degree of change and species composition of pioneer species during the early spring recovery of the community can be used as important indicators of regional ecology and to predict subsequent ecological stability in the early spring. Rodents serve as ecological engineers in the ecosystem through their behavior, and they influence the composition of biological communities. In this study, we analyzed the correlations between soil physicochemical properties, community assembly, plant diversity and microbial diversity in the areas disturbed by gerbils (RD) and those not disturbed by gerbils (CK) with ephemeral plants in the arid zone and comprehensively evaluated the soil quality (SQI) and ecosystem sustainability (SI). The results showed the following: (1) soil nutrients within the two different areas were significantly different owing to disturbance, and the biodiversity in the RD was greater than that in the CK, but there was low homogeneity; (2) There were significant differences in plant diversity and microbial diversity within the two different; (3) The correlation analysis of community assembly showed that the niche width of the community in RD was higher and the community composition was more affected by deterministic factors, while that in CK was the opposite; and (4) The analytical results showed that the SI and SQI in the RD were smaller than those in the CK. In conclusion, disturbance by rodents enhances biodiversity in arid areas but detrimental to the long-term development of communities. Therefore, it is important to explore the rational use of disturbance relationships to “complement the strengths and weaknesses,” provide a theoretical basis for future reasonable control of disturbance, maintain the ecological development of arid areas, and improve the ecological stability of desert arid regions.

Evaluating the Stand Structure, Carbon Sequestration, Oxygen Release Function, and Carbon Sink Value of Three Artificial Shrubs alongside the Tarim Desert Highway

Currently, the ecological problems caused by the greenhouse effect are growing more serious, and implementing carbon sequestration methods is an effective way to address them. Arid and semi-arid desert areas have tremendous potential as carbon sinks, and artificial forests in these areas play an important role in absorbing and sequestering carbon dioxide. This study selected three main species of artificial protective trees along the Tarim Desert Highway—Haloxylon ammodendron (C.A.Mey.) Bunge, Calligonum mongolicum Turcz. and Tamarix chinensis Lour.—and evaluated them for their carbon sequestration, oxygen release capacity, and economic benefits using Pn (net photosynthetic rate) and biomass methods. The results showed that the average daily Pn value and carbon sequestration and oxygen release per unit leaf area of T. chinensis were significantly higher than those of H. ammodendron and C. mongolicum (p < 0.05). The total carbon storage of the three shelterbelts was 15.41 × 104 t, and the carbon storage of H. ammodendron was significantly higher than that of C. mongolicum and T. chinensis (p < 0.05). According to the net photosynthetic rate method, the annual carbon sequestration and oxygen release of the shelter forest is 6.13 × 104 t a−1, and the transaction price is CNY 13.73 million a−1. The total amount of carbon sequestration and oxygen release of the shelter forest obtained via the biomass method is 97.61 × 104 t, and the transaction price is CNY 218.77 million. This study conducted research on the carbon sequestration capacity of protective forests along the Tarim Desert Highway located in an extremely arid region. It highlights the significant contribution of these protective forests in terms of carbon storage, playing a crucial role in promoting ecological restoration and sustainable development in arid areas. Additionally, this study provides a scientific basis for estimating carbon storage and promoting the sustainable management of artificial forests in arid desert regions.

Bioaccessible metals in dust materials from non-sulfide Zn deposit and related hydrometallurgical operation

Mining and processing of ores in arid (desert) areas generates high amounts of dust, which might be enriched in potentially harmful elements. We studied dust fractions of ores, soils, and technological materials from mining and related hydrometallurgical operation at former Skorpion Zinc non-sulfide Zn deposit in southern Namibia (closed and placed under maintenance in 2020). Chemical and mineralogical investigation was combined with oral bioaccessibility testing of fine dust fractions (<48 μm and <10 μm) in simulated gastric fluid (SGF) to assess potential risk of intake of metallic contaminants (Cd, Cu, Pb, Zn) for staff operating in the area. The bulk metals concentrations were largely variable and ranked as follows: soils < tailings ≪ Skorpion ores < imported ores and dross used for feed ore blending. Maximum contaminant concentrations in the original granular materials were 927 mg Cd/kg, 9150 mg Cu/kg, 50 g Pb/kg and 706 g Zn/kg, respectively, and generally increased as a function of decreasing grain size. The highest bioaccessible concentrations of Cd and Pb yielded imported ores from Taiwan and Turkey and, together with the milled dross, these samples also exhibited the highest Zn bioaccessibilities. The exposure estimates calculated for a worker (weighing 70 kg) in this mining/ore processing operation at a dust ingestion rate of 100 mg/day indicated that most dust samples (soils, tailings, Skorpion ores) exhibited metals intake values far below tolerable daily intake limits. The overall health risk was limited in all mining and ore processing areas except for the ore blending area, where imported ores and recycled dross enriched in bioaccessible Cd, Pb and/or Zn were used for the ore blending. Safety measures required by the mine operator (wearing of masks by the operating staff) helped to prevent the staff's exposure to potentially contaminated dust even in this blending ore area.

Reviewing Historic Urban Water Transitions to Advance Water-Sensitive Urban Design for Bhuj, India

In rapidly growing urban contexts, water plays a pivotal role in the transitions the urban environment goes through to sustain the quality of life of its population. Spatial planning and design are essential for the facilitation and manifestation of such transitions. Focusing on Bhuj, a rapidly growing Indian city in a hot arid desert climate, its crucial yet changing sensitivity to urban water flows over time is assessed. The concept of water sensitivity is coined as a goal to pursue by the Water-Sensitive Urban Design approach. In India, however, much of the urban design and development processes are of an unplanned and informal nature, seemingly inhibiting the water sensitivity of urban transitions. Reviewing spatial planning paradigms and their manifestation in space in Bhuj over time, however, brings to light a pre-existing water sensitivity. Yet it also shows a shift from the supply security-oriented ingenious watershed expansion to catastrophe-steered and urban expansion-driven water system negligence. Review and discussion of past and present urban water transitions and management points out drivers, barriers, and their interrelationships, to enable and advance water-sensitive urban development tied to local history, traditional knowledge, and context specificities.

Groundwater Level Dynamic Impacted by Land-Cover Change in the Desert Regions of Tarim Basin, Central Asia

Groundwater is essential to residents, ecology, agriculture, and industry. The depletion of groundwater impacted by climatic variability and intense human activities could threaten water, food, and socioeconomic security in arid regions. A thorough understanding of groundwater level dynamics and its response to land-cover change is necessary for groundwater management and ecosystem improvement, which are poorly understood in arid desert regions due to a scarcity of field monitoring data. In our study, spatiotemporal characteristics of groundwater level impacted by land-cover change and its relationship with vegetation were examined using 3-years in-situ monitoring data of 30 wells in the desert regions of Tarim Basin during 2019–2021. The results showed that the depth to groundwater level (DGL) exhibited obvious spatial and seasonal variations, and the fluctuation of DGL differed significantly among the wells. The cultivated land area increased by 1174.6, 638.0, and 732.2 km2 during 2000–2020 in the plains of Yarkand, Weigan-Kuqa, and Dina Rivers, respectively, mainly transferring from bare land and grassland. Annual average Normalized Difference Vegetation Index (NDVI) values increased with time during the period in the plains. DGL generally exhibited a weakly increasing trend from 2019 to 2021, mainly due to human activities. Land-cover change significantly affected the groundwater level dynamic. Generally, the groundwater system was in negative equilibrium near the oasis due to agricultural irrigation, was basically in dynamic equilibrium in the desert region, and was in positive equilibrium near the Tarim River Mainstream due to irrigation return water and streamflow. NDVI of natural desert vegetation was negatively correlated with DGL in the desert regions (R2 = 0.78, p &lt; 0.05). Large-scale land reclamation and groundwater overexploitation associated with water-saving irrigation agriculture development have caused groundwater level decline in arid oasis-desert regions. Hence, controlling groundwater extraction intensity, strengthening groundwater monitoring, and promoting water-saving technology would be viable methods to sustainably manage groundwater and maintain the ecological environment in arid areas.

Host selection tendency of key microbiota in arid desert lichen crusts.

Lichen genus Endocarpon in biological soil crust form was chosen as a model to investigate the bacterial communities for the first time across four vertically distinct strata. Key bacterial microbiota in lichen thallus were discovered, which were gradually filtered and mainly derived from the crust soil, with clear host selection tendency. The study provided key information to better understand the homeostasis maintenance mechanism of the lichen symbiont and community assembly of desert lichen crust.

On the distribution of the Egyptian Fruit Bat Rousettus aegyptiacus in Saudi Arabia (Mammalia: Chiroptera)

New records of the Egyptian Fruit Bat (Rousettus aegyptiacus) from 14 sites situated in the north-western part of Saudi Arabia interconnect the previously known parts of the distributon range of this bat in Arabia and suggest its continuous occurrence in a belt of coastal regions and the Hijaz Mountains along the Red Sea. These data indicate that the fruit bats can occur in very small spots of fertile environment surrounded by arid rocks and deserts and use them as foraging and roosting habitats. The occurrence of R. aegyptiacus was also confirmed in most of the sites where it was suggested previously. The occurrence in Hail represents the most remote spot of the fruit bat presence in the Arabian Desert, situated more than 500 km from the closest seashore, and around 315 km from the closest locality of R. aegyptiacus reported previously. We consider this occurrence an overlooked but traditional part of R. aegyptiacus distribution, connected with the broad use of the Date Palms grown in the area continuously since antiquity.

Different Responses of Soil Bacterial and Fungal Communities in Three Typical Vegetations following Nitrogen Deposition in an Arid Desert.

The effects of increased nitrogen (N) deposition on desert ecosystems have been extensively studied from a plant community perspective. However, the response of soil microbial communities, which play a crucial role in nutrient cycling, to N inputs and plant community types remains poorly understood. In this study, we conducted a two-year N-addition experiment with five gradients (0, 10, 30, 60, and 120 kg N ha-1 year-1) to evaluate the effect of increased N deposition on soil bacterial and fungal communities in three plant community types, namely, Alhagi sparsifolia Shap., Karelinia caspia (Pall.) Less. monocultures and their mixed community in a desert steppe located on the southern edge of the Taklimakan Desert, Northwest China. Our results indicate that N deposition and plant community types exerted an independent and significant influence on the soil microbial community. Bacterial α-diversity and community dissimilarity showed a unimodal pattern with peaks at 30 and 60 kg N ha-1 year-1, respectively. By contrast, fungal α-diversity and community dissimilarity did not vary significantly with increased N inputs. Furthermore, plant community type significantly altered microbial community dissimilarity. The Mantel test and redundancy analysis indicated that soil pH and total and inorganic N (NH4+ and NO3-) levels were the most critical factors regulating soil microbial communities. Similar to the patterns observed in taxonomic composition, fungi exhibit stronger resistance to N addition compared to bacteria in terms of their functionality. Overall, our findings suggest that the response of soil microbial communities to N deposition is domain-specific and independent of desert plant community diversity, and the bacterial community has a critical threshold under N enrichment in arid deserts.

Isolation, Identification, Anti-Inflammatory, and In Silico Analysis of New Lignans from the Resin of Ferula sinkiangensis.

Ferula sinkiangensis K. M. Shen (Apiaceae) is distributed in arid desert areas of Xinjiang, and its resin is a traditional Chinese medicine to treat gastrointestinal digestive diseases. To explore bioactive components from F. sinkiangensis, three new lignans and thirteen known components were isolated. The structural elucidation of the components was established utilizing spectroscopic analyses together with ECD calculations. Griess reaction results indicated new compounds 1 and 2 significantly decreased NO production in LPS-stimulated RAW 264.7 macrophages, and ELISA results indicated that they effectively attenuated LPS-induced inflammation by inhibiting TNF-α, IL-1β, and IL-6 expressions. The in silico approach confirmed that compound 1 docked into the receptors with strong binding energies of -5.84~-10.79 kcal/mol. In addition, compound 6 inhibited the proliferation of AGS gastric cancer cells with IC50 values of 15.2 μM by suppressing the cell migration and invasion. This study disclosed that F. sinkiangensis might be a promising potential resource for bioactive components.

Mixed Multi-Pattern Regression for DNI Prediction in Arid Desert Areas

As a crucial issue in renewable energy, accurate prediction of direct normal solar irradiance (DNI) is essential for the stable operation of concentrated solar power (CSP) stations, especially for those in arid desert areas. In this study, in order to fully explore the laws of climate change and assess the solar resources in arid desert areas, we have proposed a mixed multi-pattern regression model (MMP) for short-term DNI prediction using prior knowledge provided by the clear-sky solar irradiance (CSI) model and time series patterns of key meteorological factors mined using PR-DTW on different time scales. The contrastive experimental results demonstrated that MMP can outperform existing DNI prediction models in terms of three recognized statistical metrics. To address the challenge of limited data in arid desert areas, we presented the T-MMP model involving combined transfer learning and MMP. The experimental results demonstrated that T-MMP outperformed MMP in DNI prediction by exploiting the significant correlation between meteorological time series patterns in similar areas for data augmentation. Our study provided a valuable prediction model for accurate DNI prediction in arid desert areas, facilitating the economical and stable operation of CSP plants.

Analysis on trend evolution and driving factors of soil protection services in eastern sandy region of China

Soil erosion is the leading cause of global environmental degradation that accelerates soil degradation through climate and land use/land cover changes. The eastern sandy region of China is located at vast arid and semi-arid desert areas, and is characterized by arid climate, extreme rainfall events, vegetation degradation and poor farming practices, with serious land desertification, sandstorm disaster and soil erosion. Soil protection is the primary way to suppress soil erosion, including windbreak and sand fixation (WSF) and soil conservation (SC) service. The spatio-temporal patterns, spatial relationships and driving factors of soil protection services (WSF and SC) in eastern sandy region of China were investigated using National Wind Erosion Survey Model of China (NWESMC) and Revised Universal Soil Loss Equation (RUSLE). The results indicated that: (1) In eastern sandy region, the total soil erosion was 17.31 × 107 t from 2000 to 2020, of which wind and water erosion was 15.8 × 107 t and 1.51 × 107 t, respectively. (2) The total amount of soil protection was 45.5 × 107 t, with WSF and SC showing opposite spatio-temporal pattern. (3) Climate factors played dominant role for the change of soil protection service, with wind speed weakening being the main reason for the weakening of WSF service, the increase of precipitation enhancing SC service. Human activities (such as ecological engineering) may play a significant part in the future. The study has implications for soil protection in arid and semiarid regions worldwide, and can offer scientific recommendations for land management and soil remediation in sandy areas of China.

Analysis of Soil Pysical and Chemical Properties in Liangucheng National Reserve in Minqin, China

This study aimed to explore the basic characteristics of soil and improve the natural environment in arid desert areas. The study was conducted in the Liangucheng National Reserve in Minqin, Gansu, and SPSS, EXCEL and GIS software was used to analyze and process data. The semivariogram model and Kriging interpolation method were used to analyze the basic characteristics, mutual relationships, and spatial distribution patterns of the primary physical and chemical properties of the soil in the reserve, including the soil moisture content, conductivity, pH, organic matter, nitrogen, phosphorus, and potassium. The results show that the soil conditions in the reserve are poor, with low water content and nutrient content. The soil characteristics were correlated and were not substantially affected by soil pH and electrical conductivity. Additionally, the measured soil elements had a unique spatial distribution pattern and similarities in their spatial distribution patterns. The spatial correlation between total soil phosphorus and pH was strongest, and the northern part of the reserve, especially near Qingtu Lake, had the best soil conditions, and the central area had the worst soil conditions.