Longnan City Research Articles

Evolution of Phenotypic Traits and Main Functional Components in the Fruit of 'Chenggu-32' Olives (Olea europaea L.) Cultivated in Longnan (China).

China has taken olive cultivation as a significant part of its agricultural development. Longnan city of Gansu province was marked into the world olive distribution map by International Olive Oil Council in 1998. However, so far, little research has been done on the growth and development stages of Chinese olives. The objective of this study was to investigate the dynamics changes of several quality characteristics of olive oil at different sampling times. Olive fruit of 'Chenggu-32' grown in Longnan were harvested at twenty-four time periods and used for determination of phenotypic traits and oil quality characteristics: total polyphenols and flavonoids contents, as well as fatty acid composition by using Gas Chromatography-Mass Spectrometer (GC-MS) and analysed by using Principal Components Analysis (PCA). Towards maturation, fruit moisture content decreased while oil content increased. Levels of both total flavonoids and total polyphenols contents slightly decreased first then increased. The ratio of unsaturated to saturated fatty acids was close to three. The ratio of monounsaturated fatty acids (MUFA)/ polyunsaturated fatty acids (PUFA) was from 2.28 to 4.05. The oleic acid (C18:1)/linoleic acid (C18:2) ratio was varied between 5.23 and 10.67 according to different sampling dates. The olive oil had lower oleic acid (C18:1) levels, higher linoleic acid (C18:2), linolenic acid (C18:3), and palmitic acid (C16:0) levels compared to Codex values (2017) in some periods, which is the characteristics fatty acid composition of 'Chenggu-32' variety in Longnan, China.

An example of a hazard and risk assessment for debris flows—A case study of Niwan Gully, Wudu, China

The highly geologically active, structurally complex Bailongjiang river basin, Longnan City, Gansu Province hosts many debris-flow gullies. The recent Wenchuan and Jiuzhaigou earthquakes have increased the amount of source material available in these debris flow gullies, and the disturbed nature of the slopes makes them prone to failure under high rainfall, increasing the risk of large-scale debris flows. Moreover, poor urban planning in the region may multiply the human and economic losses caused by debris flows. Therefore, it is necessary to determine the potential hazard zones associated with such debris flows and to implement debris flow hazard and risk assessment. In this paper, Niwan gully is chosen as the study object, as it is characterized by repeated debris flow outbreaks and an ill-considered urban planning at the outlet of the gully. A depth-integrated continuum method is adopted to determine the potential hazard zones of debris flows with different recurrence intervals. The debris flow inundation and evolutionary trajectory are shown to be reasonably comparable with historical debris flows. A two-factor model that couples maximum flow depth with momentum is used to better classify the hazard zones. This study also provides a complete and efficient means to determine the values of debris flow parameters and to implement a hazard and risk assessment based on the solid material reserve method and a probabilistic method. This proposed approach efficiently generated a debris flow risk distribution map that can be used for effective disaster prevention in the Bailongjiang River basin.

The Cassidinae beetles of Longnan County (Jiangxi, China): overview and community composition.

There are few reports on the community composition and diversity pattern of the Cassidinae species of China. Compared to the neighbouring provinces of Guangdong, Fujian and Zhejiang, the Cassidinae richness in Jiangxi Province is under-reported. Longnan City, a biodiversity hotspot in Jiangxi Province, was chosen to obtain the first overview of the Cassidinae beetles. The sample coverage curves for the three sample sites reached an asymptote which indicated sampling was sufficient for data analysis. A total of eight tribes, 16 genera, 59 species and 1590 individuals of Cassidinae beetles were collected. Most belonged to the tribe Hispini (1121 individuals; 70.5%), followed by the tribe Cassidini (161 individuals; 10.13%) and the tribe Oncocephalini (159 individuals; 10.0%). The remainder (149 individuals) belonged to five tribes (Gonophorini, Basiprionotini, Callispini, Notosacanthini and Aspidimorphini). The tribes Notosacanthini, Aspidimorphini and Oncocephalini were newly recorded for Jiangxi Province. There were 14 families, 27 genera and 39 species of host plants of Cassidinae beetles in Longnan County. Cassidinae larvae mainly feed on the plant families Poaceae, Rosaceae, Lamiaceae and Rubiaceae. Most host-plant associations are new reords for the beetle species. This research, together with our planned future work in China, may help to explain the geographical distribution, diversity patterns and host plant associations of these beetles.

Two New Species of the Genus Trechus Clairville, 1806 from Gansu Province of China (Coleoptera, Carabidae)

A new species group of Trechus Clairville, 1806 has been established to include two new rather isolated species of the genus from southern Gansu, China. Both species were collected in the high mountains located WSW of Longnan (= Wudu) City: T. glebisp. n. (from the valley, situated 8–11 km SE of Guazigou Village) and T. rhombussp. n. (from the sources of the Yantanghe River). In their external characters, members of the glebi-species group are characterized, first of all, by the Epaphius-like robust appearance and the posterior position of the preapical pore on elytra typical of the true Trechus.

Dynamic assessment of the fruit quality of olives cultivated in Longnan (China) during ripening

As an emerging olive planting country, olive growing area in China is expanding to southwest. The fruit quality changes of five main olive cultivars in Longnan City, Gansu Province during ripening were evaluated. The olive fruits introduced and cultivated in Longnan experienced a period of growth and maturity from June to October, and the suitable harvest time is from late October to mid-November. The appearance, colour and main biochemical components of olive fruits changed significantly during ripening. There was a significant relationship between the changes of total sugar contents in fruit and leaf, and oil accumulation in fruit, showed that as the oil content in olive fruit was increasing, while the sugar content in fruit and leaf was decreasing. Although the oil content in olive fruits increased continuously during ripening, the fatty acid types and proportions of different varieties do not change significantly, the main fatty acids are: C18:1>C16:0 >C18:2 >C18:0 >C16:1. Flavonoids and polyphenols content in olive leaves increased constantly during fruits ripening, while the evolution of those components in fruits was different due to the cultivars and maturity degree. The PPO activity in olive fruit reached a peak in mid-September, and there was no correlation between PPO activity and polyphenol content in fruits. The results showed that the five main olive cultivars introduced and cultivated in Longnan exhibited good production performance. Fruit quality and its evolution mainly depend on cultivars, genetic characteristics and also related to grade of maturity, environmental and agronomic conditions.

Efficacy and safety of small-incision open reduction and internal fixation with absorbable screws for anterior cruciate ligament tibial eminence avulsion fractures: a self-controlled clinical trial

Background and objective: Anterior cruciate ligament tibial eminence avulsion fractures are repaired via early open reduction. Choosing the best fixation method in accordance with the bone size can effectively promote restoration of the cruciate ligament to its normal anatomical position and achieve bone healing. The use of absorbable screws for internal fixation of anterior cruciate ligament tibial eminence avulsion fractures reportedly promotes fracture healing, but the efficacy and safety need further clarification. The present study aims to observe the efficacy and safety of open reduction and internal fixation with absorbable screws through a small incision in the repair of anterior cruciate ligament tibial eminence avulsion fracture. Participants and methods: This prospective, single-center, self-controlled trial will include 72 patients with anterior cruciate ligament tibial eminence avulsion fractures. Open reduction and internal fixation with absorbable screws will be performed through a small incision. All patients will be followed up at 3, 6, and 12 months postoperatively. This study was approved by the Medical Ethics Committee of No. 1 Hospital of Longnan City, China in December 2014 (approval number: S2014-064-02). Protocol version is 1.0. Written informed consent regarding the study protocol and surgery procedure will be obtained from the participants’ family members or the participants themselves. Results: The primary outcome measure is the recovery of knee function assessed by the Lysholm Knee Scoring Scale score at 12 months postoperatively. Secondary outcome measures are the Lysholm Knee Scoring Scale scores preoperatively and 3 and 6 months postoperatively, the International Knee Documentation Committee scores, knee range of motion, knee morphology on radiographs and magnetic resonance images preoperatively and 3, 6, and 12 months postoperatively, and the incidences of adverse reactions 3, 6, and 12 months postoperatively. In our pilot study involving 50 patients with anterior cruciate ligament tibial eminence avulsion fractures (50 knees) from October 2015 to January 2018, no patient had joint stiffness or fracture redisplacement on radiography 3 months postoperatively. The mean knee range of motion was significantly larger at 6 months postoperatively compared with preoperatively (P Conclusion: This trial will assess the efficacy and safety of open reduction and internal fixation with absorbable screws through a small incision to restore knee function in patients with anterior cruciate ligament tibial eminence avulsion fracture. Trial registration: This study was registered with the Chinese Clinical Trial Registry on March 13, 2019 (registration number: ChiCTR1900021865).

陇南市中药材产业新发展驱动现状及扶贫开发

陇南市中药材产业新发展驱动现状及扶贫开发

Spatio-temporal prediction of crop disease severity for agricultural emergency management based on recurrent neural networks

As crop diseases bring huge losses every year in both developed and developing countries, determining how to precisely predict crop disease severity to facilitate agricultural emergency management is really a worldwide problem. Previous studies have introduced machine learning (ML) techniques into crop disease prediction and achieved better experimental results. However, the architectures of these ML models are unsuitable to model time series data. Moreover, the dependences among observations over time and across space have not been taken into account in model construction. By applying data-mining techniques to dynamic spatial panels of remote sensing data and considering features of bioclimatic, topographic and soil conditions as a supplement, we propose a novel crop disease prediction framework for agricultural emergency management based on ensemble learning techniques and spatio-temporal recurrent neural network (STRNN) which is an extension of recurrent neural network (RNN) in time and space. Empirical experiments are conducted on a specific dataset which is built based on reported cases of wheat yellow rust outbreaks in the Longnan city. Experimental results indicate that our proposed method outperforms all baseline models in crop disease severity prediction. The managerial implication of our work is that by applying the proposed methodology, some preparedness measures can be implemented in advance to prevent or mitigate the possible disasters according to predicted results. Notable economic and ecological benefits can be achieved by optimizing the frequency and timing of application of fungicide, pesticides and other preventative measures.

Study on the Music Culture of Cribwork Song of Kangxian County, Longnan City of China

Cribwork Song is a long narrative folk song, which spread in the folk of Kangxian County, Longnan City, Gansu Province of China. This paper has analyzed historical background, humanistic environment, story plot, artistic characteristic and inheritance significance of Cribwork Song.

土壤纤毛虫群落对退耕还林生态恢复的响应——以侧柏林为例

PDF HTML阅读 XML下载 导出引用 引用提醒 土壤纤毛虫群落对退耕还林生态恢复的响应——以侧柏林为例 DOI: 10.5846/stxb201401060047 作者: 作者单位: 西北师范大学 作者简介: 通讯作者: 中图分类号: Q959 基金项目: 国家自然科学基金资助项目(41361055) Response of soil ciliate communities to ecological restoration after the implementation of the conversion of cropland to forest and grassland program:a case study of Platycladus orientalis Forest Author: Affiliation: College of Life Science，Northwest Normal University Fund Project: 摘要 | 图/表 | 访问统计 | 参考文献 | 相似文献 | 引证文献 | 资源附件 | 文章评论 摘要:为了了解土壤纤毛虫群落对退耕还林区生态恢复下土壤环境变化的响应及尝试利用土壤纤毛虫群落特征评价退耕还林生态恢复的效果,于2010年3月至9月采用"非淹没培养皿法"、活体观察法、蛋白银染色法和Foissner计数法对甘肃陇南武都退耕还林区5个不同恢复阶段的样点和1个荒草坡对照样点的土壤纤毛虫群落特征进行了研究,同时测定了pH值、温度、含水量及速效磷、有效钾、铵态氮、有机质和有机碳含量等土壤环境因子并分析了生态恢复条件下土壤纤毛虫群落特征与土壤环境因子的相关性。研究中共鉴定到71种纤毛虫,隶属于3纲、10目、22科、29属。研究发现,不同恢复年限的土样中土壤纤毛虫的物种分布存在明显差异,并随恢复时间的延长,样点间物种相似性减小,群落组成复杂化,物种数、种群密度和物种多样性指数总体均呈增长趋势。优势类群也发生了演替,由恢复初期的肾形目演替到后期的下毛目。相关性分析结果表明,在生态恢复条件下,土壤有机质和铵态氮含量是影响土壤纤毛虫群落结构稳定性的主要因素,不同纤毛虫类群对生态恢复的响应存在差异。冗余分析显示,土壤纤毛虫群落很好地响应了生态恢复过程中土壤环境条件的变化。 Abstract:Soil ciliates are some of the most complex and highly differentiated soil unicellular eukaryotes and play an important role in soil ecosystems. The species richness and individual abundance of soil ciliates, and their unique cell structures and physiological characteristics means that soil ciliate communities are highly sensitive to environmental conditions and therefore can be used as bioindicators in natural and human-influenced soil ecosystems.In order to understand the response of soil ciliate communities to the soil environmental changes after the implementation of the Conversion of Cropland to Forest and Grassland Program, from March to September 2010, the community characteristics of soil ciliates in five sampling sites(Platycladus orientalis forests) at different stages of restoration, together with a control sampling site(a wild grass slope). The sites were located in Wudu District, Longnan City, and were studied using the non-flooded petri dish method, observation in vivo, protargol impregnation, and Foissner's counting method. A total of 71 soil ciliate species were identified in this study, which belonged to 3 classes, 10 orders, 22 families, and 29 genera. Hierarchical cluster analysis showed significant differences in the distribution of soil ciliate species among the soils collected from forests at different restoration stages. Furthermore, the analysis indicated that as restoration progressed, the composition of soil ciliate species became more and more complex. The diversity of soil ciliate species in the soil samples collected from the restoration sites were all higher than that in the control soil sample. Multiple linear regression analysis revealed that there was a significant correlation between the ciliate species number and restoration stage(ŷ=2.714x2-10.820x+28.400, R2=0.940), and that there was an increase in the number of ciliate species as the restoration progressed. A statistical analysis of the number of the soil ciliate species showed a gradual succession of dominant soil ciliate groups over the course of ecological restoration. The dominant soil ciliate group Colpodida in earlier restoration soils was substituted by Hypotrichida in later restoration soils.In this study, the soil environmental conditions including pH, soil temperature, soil water content, soil available phosphorus, available potassium, ammonium nitrogen, organic matter, and organic carbon in different soil samples were also investigated using potentiometric determination, angle stem earth thermometer,high-temperature drying, Olsen's method, sodium tetraphenylboron turbidimetry, indophenol blue colorimetry, and hydration heat-photoelectric colorimetry, respectively. The results of physicochemical analysis of the soil samples suggested that soil quality improved during the conversion from cropland to forestland. Bivariate correlation analysis showed that soil organic matter and ammonium nitrogen had the most important influence on soil ciliate community diversity. Finally, the redundancy analysis results suggested that the variation between soil ciliate communities had a significant correlation with changes to soil environmental conditions during the conversion from cropland to forestland. Therefore, the soil ciliates could be considered as indicator organisms for assessing the effects of ecological restoration after conversion of cropland to forest. 参考文献 相似文献 引证文献

Identification of Slope Debris Flow Based on Fisher Discriminated Criterion

On the basis of analyzing formation condition of slope debris flow, optimize four indexes as the discriminated factors: the loose material reserves weighted by area (),effective particle size of the loose material ,geomorphic super entropy (),meteorological and hydrological index which is composed of indirect and direct antecedent precipitation and short duration rainfall (),use the basic data of slope debris flow in Beishan of Longnan City, build the Fisher discriminated analysis model , find out the discriminated function of debris flow and non-debris flow on slope is,critical value is 1.305,give the new method of identification on the slope debris flow.

Incidence of Japanese encephalitis, visceral leishmaniasis and malaria before and after the Wenchuan earthquake, in China

The objective of this study was to investigate the incidence of insect-borne diseases from 2005 to 2011, before and after the 2008 Wenchuan earthquake in Longnan City, Gansu Province, China. The data include Japanese encephalitis, Kala-azar and malaria cases from 2005 to 2011 that occurred in Longnan City. We calculated the incidence rates and analyzed the epidemiological characteristics of the diseases before and after the Wenchuan earthquake. During 2005–2011, 212 Japanese encephalitis cases were reported in Longnan City, and the average incidence was 1.11/100,000. Compared with any year from 2005 to 2010 the incidence of Japanese encephalitis in Longnan City in 2011 was not significantly different (P≥0.05). From 2005 to 2011, there were 719 Kala-azar cases in Longnan City, the annual incidence was 3.77/100,000, and the incidence in males was higher than females (P<0.001). Compared with 2011, there was no significant difference in incidence of Kala-azar in 2009 or 2010 (P≥0.05). There were seven total cases of malaria from 2005 to 2011, and the annual incidence was 0.07/100,000. Wudu District and Wen County were the main endemic areas of insect-borne diseases in Longnan City. The results showed that Japanese encephalitis and Kala-azar were common insect-borne infectious diseases in Longnan City, and that the incidence of insect-borne disease did not increase after the Wenchuan earthquake. It is possible that vector control measures implemented after the earthquake prevented an increase in such diseases.

Risk Assessment of Geological Hazard in Wudu Area of Longnan City, China

Risk assessment of geological hazard is the study of damage degree of human life and property affected by the geological disaster. It is of great importance for reducing harm level of geological hazard fatalness, preventing and controlling of geological disaster. As an example in Wudu area of Longnan City, we choose topography, lithology, meteorology, hydrology and human activity as the hazard assessment factors, on the basis of detailed investigation of geological conditions in study area. Then, adding the importance of the residents activity area as a risk assessment factor, we have finished the geological hazard assessment and its risk assessment by GIS combined with AHP. The result shows that the proportions of geological hazard risk of non-risk, low-risk, medium-risk and high-risk area are respectively 31%, 14%, 25% and 30%.