Field Study In China Research Articles

AI-Enhanced Design and Application of High School Geography Field Studies in China: A Case Study of the Yellow (Bohai) Sea Migratory Bird Habitat Curriculum

China’s Yellow (Bohai) Sea bird habitat is an important ecological region. Its unique ecology and challenges provide rich resources for research and study. Our course design concept is supported by AI technology, and improves students’ abilities through innovative functions such as dynamic data support, personalized learning paths, immersive research and study experience, and diversified evaluation mechanisms. The course content revolves around the “human–land coordination concept”, including pre-trip thinking, research and study during the trip, and post-trip exhibition learning, covering regional cognition, remote sensing image analysis, field investigation, and protection plan display activities. ERNIE Bot participates in optimizing the learning path throughout the process. The course evaluation system starts from the three dimensions of “land to people”, “people to land”, and the “coordination of the human–land relationship”, adopts processes and final evaluation, and uses ERNIE Bot to achieve real-time monitoring, data analysis, personalized reports, and dynamic feedback, improving the objectivity and efficiency of evaluation, and helping students and teachers optimize learning and teaching. However, AI has limitations in geographical research and study, such as insufficient technical adaptability, the influence of students’ abilities and habits, and the adaptation of teachers’ role changes. To this end, optimization strategies such as improving data quality and technical platforms, strengthening student technical training, enhancing teachers’ AI application capabilities, and enriching AI functions and teaching scenarios are proposed to enhance the application effect of AI in geographical research and promote innovation in educational models and student capacity building.

Innovative approach to utilising magnetic fields to enhance wheat yield: evidence from field studies in China

Innovative approach to utilising magnetic fields to enhance wheat yield: evidence from field studies in China

Impact of Molecular Chlorine Production from Aerosol Iron Photochemistry on Atmospheric Oxidative Capacity in North China.

Elevated levels of atmospheric molecular chlorine (Cl2) have been observed during the daytime in recent field studies in China but could not be explained by the current chlorine chemistry mechanisms in models. Here, we propose a Cl2 formation mechanism initiated by aerosol iron photochemistry to explain daytime Cl2 formation. We implement this mechanism into the GEOS-Chem chemical transport model and investigate its impacts on the atmospheric composition in wintertime North China where high levels of Cl2 as well as aerosol chloride and iron were observed. The new mechanism accounts for more than 90% of surface air Cl2 production in North China and consequently increases the surface air Cl2 abundances by an order of magnitude, improving the model's agreement with observed Cl2. The presence of high Cl2 significantly alters the oxidative capacity of the atmosphere, with a factor of 20-40 increase in the chlorine radical concentration and a 20-40% increase in the hydroxyl radical concentration in regions with high aerosol chloride and iron loadings. This results in an increase in surface air ozone by about 10%. This new Cl2 formation mechanism will improve the model simulation capability for reactive chlorine abundances in the regions with high emissions of chlorine and iron.

Improving children's outdoor thermal comfort: A field study in China's severely cold regions

This study used meteorological monitoring, subjective thermal perception surveys, and activity records to explore the factors that affect children's outdoor thermal comfort in China's severely cold regions. The Universal Thermal Climate Index (UTCI) was used to determine children's thermal benchmarks and calendar, based on which a strategy to improve thermal comfort was proposed. Results showed (1) significant differences in solar radiation and wind speed, but not in air temperature and relative humidity between different areas. (2) Different Microclimate parameters affected children's thermal perception in different seasons: solar radiation (G) in winter, air temperature (Ta) in summer. (3) Children tolerate the UTCI changes in winter than in summer. (4) Children's neutral UTCI in winter and summer were 9.7 °C and 17.6 °C, respectively, and its ranges were 2.3–17.1 °C and 13.6–21.7 °C, respectively. The thermal acceptability range by 80% of the interviewed children was 2.1–16.3 °C. (5) Based on these results, a thermal comfort improvement on two dimensions—children and the environment—was implemented. This study enriches basic research on children's outdoor thermal comfort and provides a reference for the construction of urban child-friendly spaces.

A systematic review on thermal environment and thermal comfort studies in Chinese residential buildings

Amid the backdrop of the energy crisis, thermal comfort is crucial to achieve energy savings. Residential buildings are characterized by a wide range of adaptive comfort opportunities. However, there has been a lack of systematic refinement and review of residential thermal comfort field studies in China to provide valuable recommendations for energy conservation. We systematically reviewed studies on thermal environment and thermal comfort in Chinese residential buildings published in peer-reviewed journals up to 2020. A total of 34 studies were deemed to have provided sufficient information on both the thermal environment and thermal comfort. We found that in winter, there were obvious differences between urban and rural dwellings in Severe Cold (SC) and Cold (C) zones, with regard to their indoor air temperature (urban: 19.8 ∼ 25.0 °C v.s. rural: 11.3 ∼ 17.8 °C) and neutral temperature (urban: 17.6 ∼ 25.1 °C v.s. rural: 11.9 ∼ 23.45 °C). While in summer, the indoor air temperature in urban dwellings were slightly lower than those in rural areas due to their prevalent use of air conditioner (urban: 26.1 ∼ 28.9 °C v.s. rural: 29.5 ∼ 34.9 °C). Indoor air temperature and neutral temperature varied considerably in different climate zones in winter. In SC zones, the indoor environment was overheated, which could lead to energy wastage and overheating discomfort for residents. Residents in Hot-Summer and Cold-Winter (HSCW) zone were the most tolerant to the variation of thermal environment (the median coefficient of MTS or TSV equation: SC: 0.18; C: 0.20; HSCW: 0.13; HSWW: 0.23).

Ideas endorsed, credit claimed: Managerial credit claiming weakens the benefits of voice endorsement on future voice behavior through respect and work group identification

Does endorsement of employees’ constructive voice always result in more voice behavior in the future? Although it is often assumed that endorsement is a critical predictor of future voice behavior, we argue that this effect is contingent on whether managers claim credit for their employees’ voice. Drawing from the group engagement model, we first predict that endorsement will be positively associated with voicing employees’ perceived respect within the group, while managers’ credit-claiming behaviors will be negatively associated with such respect. We then further predict that credit-claiming behaviors serve as a boundary condition to the positive association between endorsement and respect, such that when levels of credit claiming by managers are higher, the positive association between endorsement and respect will be weakened. Higher levels of respect, in turn, are associated with higher levels of work group identification and then higher levels of future voice behavior. Results from a multi-wave survey field study in China and a scenario experiment in the United States offer support for our model. Our findings suggest an important but neglected form of managerial response to voice – credit claiming – and highlight its detrimental effect on motivating future voice behavior despite voice endorsement.

Large Contribution of Nitrous Acid to Soil-Emitted Reactive Oxidized Nitrogen and Its Effect on Air Quality.

Soil emissions have long been recognized as an important source of nitric oxide (NO), which regulates atmospheric oxidative capacity and the production of air pollutants. Recent research has also indicated that nitrous acid (HONO) can be emitted in significant quantities from soil microbial activities. However, only a few studies have quantified emissions of HONO along with NO from a wide range of soil types. In this study, we measured emissions of HONO and NO from soil samples collected from 48 sites across China and found much higher emissions of HONO than of NO, especially for samples from northern China. We performed a meta-analysis of 52 field studies in China, which revealed that long-term fertilization increased the abundance of nitrite-producing genes much more than the abundance of NO-producing genes. This promotion effect was greater in northern China than in southern China. In simulations using a chemistry transport model with laboratory-derived parametrization, we found that HONO emissions had a greater effect than NO emissions on air quality. Moreover, we determined that with projected continuous reductions in anthropogenic emissions, the contribution from soils to maximum 1 h concentrations of hydroxyl radicals and ozone and daily average concentrations of particulate nitrate in the Northeast Plain will increase to 17%, 4.6%, and 14%, respectively. Our findings highlight the need to consider HONO in the assessment of the loss of reactive oxidized nitrogen from soils to the atmosphere and its effect on air quality.

2.3 Results of the ICD-11 Clinic-Based Field Study of Mental and Behavioral Disorders in Children and Adolescents – Part 2: Clinical Utility and Implementation Characteristics Across 4 Countries

Improving clinical utility was a focus in the development of the ICD-11 mental and behavioral disorders. Clinical utility was defined in terms of value in communicating among stakeholders, implementation characteristics (eg, goodness of fit, time required to use), and usefulness for clinical decisions (eg, assigning diagnoses, selecting treatments). Here, we report the clinical utility data from the ICD-11 clinic-based field studies in China, India, Japan, and Mexico for common mental and behavioral disorders affecting youth.

Cooking fuel types and the health effects: A field study in China

Recognizing the health effect induced by using solid fuels is a stimulus for speeding up the clean energy transition in rural China. This paper estimates the impact of cooking fuel choice on residents' health based on a Multinomial Logistic regression model. We conducted a field survey and collected data from ten villages in Northern China. The results indicate that fuel stacking is prevalent in the surveyed rural region, but a transition to cleaner fuels is underway. We find that rural residents’ health status is significantly influenced by cooking fuel types. Respondents who used clean cooking fuels chronically have a 0.138 higher probability of positive evaluation and a 0.128 lower probability of negative evaluation of their health status, compared to those who use solid cooking fuel. Existing energy transition policies focus on outdoor air pollution reduction and associated public health benefits; while our results suggest that transition to clean energy in rural China can also bring significant indoor air pollution reduction and family health benefits.

Assessing heat stress relief measures to enhance outdoor thermal comfort: A field study in China's cold region

We recruited 72 healthy college students on a university campus in Xi'an, China to investigate the effectiveness of heat stress relief measures (shade, mist spraying and shade+mist) on enhancing outdoor thermal comfort. Using the Universal Thermal Climate Index (UTCI) and mean skin temperature (MST), we evaluated respondents’ thermal and physiological responses. We found that: 1) Mist spraying and shade were effective in improving respondents’ outdoor thermal comfort. The cooling effect of mist spraying was more effective than shade, while shade+mist provided a wider thermal comfort range. 2) UTCI declined among cooling strategies by 12.31 °C (shade+mist), 8.03 °C (mist spraying) and 3.48 °C (shade) on average. 3) Shade and mist caused similar cooling effects on skin temperature (ST), but MST plateaued 5 min after exposure to these cooling environments in isolation. Shade+mist provided the greatest cooling effect with MST continuing to drop as the exposure continued. 4) Predictive models showed that MST in shade, mist spraying and shade+mist decreased 0.24, 0.21 and 0.16 °C, respectively when air temperature (Ta) declined 1 °C with constant relative humidity (RH) and mean radiation temperature (Tmrt). MST in shade, mist spraying and shade+mist decreased 0.05, 0.08 and 0.06 °C, respectively where RH increased 1% with constant Ta and Tmrt.

How and When Perceptions of Top Management Bottom-Line Mentality Inhibit Supervisors’ Servant Leadership Behavior

Extending existing bottom-line mentality (BLM) perspectives, we provide a new theoretical account of how supervisors’ perceptions of top management BLM influence supervisors’ servant leadership (SL) behavior. Using role theory, we propose that these perceptions inhibit supervisors’ SL behavior by reducing their SL role conceptualization or the extent to which supervisors consider SL part of their work responsibility. Further, given that the process underlying the relationship between perceived top management BLM and supervisor SL behavior may be explained by social learning theory and human adaptive capacity perspectives, we examine the incremental validity of supervisor SL role conceptualization versus supervisor BLM and empathy as mediating mechanisms. We also propose low perspective-taking among supervisors as a boundary condition that exacerbates the negative effect of perceived top management BLM on SL role conceptualization, which then results in less servant leader behavior. Data from two multiwave field studies in China and the United Kingdom provided some support for our hypotheses. Across unique cultural contexts, our findings highlight the value of a role theory perspective in understanding perceptions of top management BLM. We discuss critical theoretical and practical implications of these findings and avenues for subsequent research.

Investigation of the consistency of Swarm data and CHAOS-6 towards crustal magnetic field studies in China

Investigation of the consistency of Swarm data and CHAOS-6 towards crustal magnetic field studies in China

Evaluation of freeway travel speed estimation using anonymous cellphones as probes: a field study in China

The high penetration rate of mobile phones among drivers and passengers indicates an opportunity for obtaining detailed information on vehicle spatial movement and estimating traffic state at a lower cost than traditional traffic monitoring techniques. In this study, we examine and assess the use of cellphones as probes to measure vehicle speeds. Network-based wireless location technology is adopted and calibrated, and the cellphone signalling data are used for traffic state estimation. Then, we introduce the relationship between the cellular network and road network, and explain how it can be used to estimate link-based average travel speed. Cellular probe-based measurements are compared with those obtained by microwave detectors for each five-minute time interval on busy road links along a freeway in Zhejiang, China, on weekdays, weekends, and holidays respectively. The analysis results show that the proposed cellphone-based system can effectively estimate travel speed on freeways with high cellphone penetration rates.

Heterogeneous N<sub>2</sub>O<sub>5</sub> reactions on atmospheric aerosols at four Chinese sites: improving model representation of uptake parameters

Abstract. Heterogeneous reactivity of N2O5 on aerosols is a critical parameter in assessing NOx fate, nitrate production, and particulate chloride activation. Accurate measurement of its uptake coefficient (γN2O5) and representation in air quality models are challenging, especially in the polluted environment. With an in situ aerosol flow-tube system, the γN2O5 was directly measured on ambient aerosols at two rural sites in northern and southern China. The results were analyzed together with the γN2O5 derived from previous field studies in China to obtain a holistic picture of N2O5 uptake and the influencing factors under various climatic and chemical conditions. The field-derived or measured γN2O5 was generally promoted by the aerosol water content and suppressed by particle nitrate. Significant discrepancies were found between the measured γN2O5 and that estimated from laboratory-determined parameterizations. An observation-based empirical parameterization was derived in the present work, which better reproduced the mean value and variability of the observed γN2O5. Incorporating this new parameterization into a regional air quality model (WRF-CMAQ) has improved the simulation of N2O5, nitrogen oxides, and secondary nitrate in the polluted regions of China.

Tillage and cropping effects on soil organic carbon: Biodegradation and storage in density and size fractions

AbstractImprovements in management practices can prevent the decline of soil organic carbon (SOC) storage caused by conventional tillage practice in Northeast China. Density and size fractionation can track the transformation of plant residue into SOC and its location in the soil matrix. We used a long‐term field study in China to evaluate these changes as a result of improved management involving tillage and cropping systems. Experimental treatments included no‐till (NT) and mouldboard ploughing (MP) under monoculture maize (Zea mays L.) (MM) and maize‐soybean (Glycine max Merr.) rotation (MS); these were compared to the traditional management involving conventional tillage (CT) under MM. An incubation study was conducted to evaluate mineralization and the biodegradability of SOC. The soils were also physically fractionated by density (light fraction, LF) and size (sand, silt and clay). With improved management, the SOC storage in the clay size fraction showed the largest increase across all fractions. This increase was greater for MS than MM. The NTMS treatment resulted in a decline in silt‐OC storage compared to CTMM. The SOC mineralization (mg CO2‐C g−1 soil) was affected by tillage and driven by LF‐OC and was observed in the order: NTMM (2.06) > MPMM (1.72) ≈ NTMS (1.71) > CTMM (1.52) ≈ MPMS (1.41). Both cropping and depth affected the biodegradability of SOC. Considering the plough layer (0–20 cm), treatments under MM had a larger proportion of biodegradable SOC than those under MS. We conclude that the significant differences in SOC storage in physical fractions and SOC biodegradation were caused by differences in soil management.Highlights Clay size fraction showed the largest increase in SOC storage when residue was returned. Silt size fraction lost SOC in no‐till maize‐soybean compared with traditional farming practice. Potential SOC mineralization depended on quantity of SOC in the LF. Biodegradability of the SOC was driven by cropping system not tillage.

Comparing regional stove-usage patterns and using those patterns to model indoor air quality impacts.

Monitoring improved cookstove adoption and usage in developing countries can help anticipate potential health and environmental benefits that may result from household energy interventions. This study explores stove-usage monitor (SUM)-derived usage data from field studies in China (52 stoves, 1422 monitoring days), Honduras (270 stoves, 630 monitoring days), India (19 stoves, 565 monitoring days), and Uganda (38 stoves, 1007 monitoring days). Traditional stove usage was found to be generally similar among four seemingly disparate countries in terms of cooking habits, with average usage of between 171 and 257minutes per day for the most-used stoves. In Honduras, where survey-based usage data were also collected, there was only modest agreement between sensor data and self-reported user data. For Indian homes, we combined stove-usage data with a single-zone Monte Carlo box model to estimate kitchen-level PM2.5 and CO concentrations under various scenarios of cleaner cookstove adoption. We defined clean cookstove performance based on the International Standards Organization (ISO) voluntary guidelines. Model results showed that even with 75% displacement of traditional stoves with the cleanest available stove (ISO tier-5), World Health Organization 24hours PM2.5 standards were exceeded in 96.4% of model runs, underscoring the importance of full displacement.

Agronomic Responses of Major Fruit Crops to Fertilization in China: A Meta-Analysis

With increasing application of nitrogen (N), phosphorus (P), and potassium (K) fertilizers, especially in China’s fruit crops, the agronomic responses of fruit crops to fertilization may be reduced with time. Thus, the quantification of these responses would be useful for establishing nutrient recommendation and fertilizer management for fruit crops. Here, a meta-analysis including 552 paired data for agronomic response and 1283 sets for amounts of optimal fertilization from 293 field studies in China were performed to systemically quantify these variations of yield response (YR), relative yield (RY), agronomic efficiency (AE), and partial factor productivity (PFP) in response to the application of N, P, or K fertilizer under different groups including fruit crop types, time, and regions. The results showed that the average YRs to N, P or K fertilizer were 7.6, 5.2, or 5.9 t ha−1, indicating related RYs of 78.0%, 82.9%, or 82.4%, respectively. All of the RYs for N, P, or K application in studies after 2000 were higher and less variable than those before 2000. Higher RYs were also shown for deciduous fruit trees when compared with evergreen fruit trees. The average AEs of N, P, and K fertilizer in China’s fruit crops were 29.1, 32.4 and 20.2 kg kg−1, all of them were negatively correlated with fertilizer rate. Due to a higher yield response and less fertilizer rate, annual crops (mainly watermelon and melons) had significantly higher AE than that of perennial crops. The average PFPs of N, P, and K fertilizer in China’s fruit crops were 129, 205, and 113 kg kg−1, all of which showed a declining trend with time. These findings demonstrated that the building-up of soil indigenous nutrient supply (indicated by RY) together with improving fruit varieties, as well as pest management and other forms of management could make external fertilization less important for increasing the yield of fruit crops in China. A rational nutrient management is therefore crucial for balancing yield and environmental concerns in countries like China, India, and other countries where fertilizers are often overused.

Cooking fuel decision-making and family structure: a field study in China.

Household air pollution caused by solid fuel use for cooking is prevalent in rural China and generates various environmental and health problems. Various potential impact factors on cooking fuel decision such as income, education, modern energy, and infrastructure are examined. However, the role of family structures has been ignored. A survey on household energy consumption pattern interrelating socio-economic and demographic factors was conducted in ten villages in Northern China using stratified random sampling technique. The number of family member eating together influences households' cooking fuel decision-making significantly. The numbers of school-age children and family members under 6 and above 60years old have no significant influence on the household's cooking fuel decision-making respectively. Compared with families with neither child nor the elderly, those with no child but at least an elderly member have 0.103 lower probability of choosing clean fuels as their primary cooking fuel. Hence, the elderly owns a heavyweight in the household fuel decision-making process in rural China, and the government should formulate policies more in line with the background of the times to deal with rural energy issues.

Inclusive leadership and team innovation: The role of team voice and performance pressure

In today's complex and rapidly changing business environment, team innovation is increasingly critical to the survival and success of organizations. Although the relevant literature highlights the importance of leadership in team innovation, previous studies have mainly focused on transformational leadership and have yielded inconsistent results. To address this void, this study integrates the goal-setting theory into the input-process-output framework and proposes a moderated mediation model to examine the relationship between inclusive leadership and team innovation. The results of hierarchical regression analysis from two survey-based field studies in China demonstrated that team voice mediated the relationship between inclusive leadership and team innovation and performance pressure moderated the direct relationship between inclusive leadership and team voice as well as the indirect relationship between inclusive leadership and team innovation via team voice such that the relationships were stronger when performance pressure was high.

Boosting water conservation by improving campaign: Evidence from a field study in China

ABSTRACTSlogans advocating water conservation appear on all kinds of media. However, it is often not clear if and how much these campaigns can boost water-conserving behaviors, especially in developing countries. The current study tries to address this issue with a field randomized control trial (RCT) experiment in China. According to the longitudinal water consumption data, we found that 1) residents who received water conserving tips significantly reduced the subsequent water consumption relative to the residents who did not receive; 2) adding (vs. not adding) quantitative information into tips made the residents reduce water consumption; 3) adding (vs. not adding) norm information into tips failed to make the residents reduce water consumption. To our knowledge, this is the first study that quantitatively investigates the effect of water conservation campaigns on actual water consumption in developing countries. Our findings thus offer valuable insights on water efficiency information campaigns and policy-making.