检索结果-南通市图书馆

Pedosphere 2013年第3期23卷 305-311页

作者： SHEN Zhang-Quan SHAN Ying-Jie PENG Li JIANG Yu-Gen Institute of Agricultural Remote Sensing and Information Technology Application Zhejiang University Zhejiang soil and fertilizer station Fuyang soil and fertilizer station

Characterizing spatial variability of soil attributes, using traditional soil sampling and laboratory analysis, is cost prohibitive. The potential benefit of managing soils on a site-specific basis is well established. High variations in glacial till soil render detailed soil mapping difficult with limited number of soil samples. To overcome this problem, this paper demonstrates the feasibility of soil carbon and clay mapping using the newly developed on-the-go near-infrared reflectance spectroscopy (NIRS). Compared with the geostatistics method, the partial least squares regression (PLSR), with NIRS measurements, could yield a more detailed map for both soil carbon and clay. Further, by using independent validation dataset, the accuracy of predicting could be improved significantly for soil clay content and only slightly for soil carbon content. Owing to the complexity of field conditions, more work on data processing and calibration modeling might be necessary for using on-the-go NIRS measurements.

关键词： independent validation on-the-go measurement soil carbon mapping soil clay mapping soil sensors

Cultivating New Agricultural Operators to Promote the Transformation and Upgrading of Traditional Agriculture——A Case Study of nanchong City

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Asian Agricultural Research 2019年第2期11卷 26-31,37页

作者： Hui LI Wanqiu WANG Changjia PENG Shipei LI Yong DU Fengrong ZHOU Jielin ZHANG Honghuan XIAO Ya ZHOU Xiangyou CHENG nanchong soil and fertilizer station nanchong Plant Protection and Inspection station nanchong Rural Cooperative Economy Management station nanchong Organic Agriculture Development Center

In order to provide reference for cultivating new agricultural operators to promote the transformation and upgrading of traditional agriculture,the main practices,achievements and problems of cultivating new agricultural operators to promote the transformation and upgrading of traditional agriculture in nanchong City,Sichuan Province were analyzed firstly,and then some measures were proposed.

关键词： New agricultural operators Cultivation Traditional agriculture Transformation and upgrading nanchong Sichuan

Main Measures and Achievements in the Development of Organic Agriculture in nanchong City

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Asian Agricultural Research 2019年第10期11卷 11-17页

作者： Ying GAO Changjia PENG Fengyuan LI Jiawei DU Jun LUO Ning LU Wanqiu WANG nanchong Agricultural Information Service station Nanchong 637000China nanchong Plant Protection and Quarantine station Nanchong 637000China nanchong Silkworm Management station Nanchong 637000China nanchong soil and fertilizer station Nanchong 637000China

In order to improve the quality and efficiency of agriculture,increase farmers'income steadily and rapidly,and improve the ecological environment of agriculture,a strong city of organic agriculture should be constructed in nanchong *** on ecological agriculture,nanchong makes great efforts to build a strong city of organic agriculture,takes environmental protection supervision as an opportunity to promote sustainable agricultural development feasibly,takes regional brands as the starting point,and promotes the development of agricultural *** main measures and achievements of the development of organic agriculture in nanchong City are analyzed and discussed starting with the next work plan.

关键词： Organic agriculture Main measures Achievements Next work plan

How to Evaluate the Rice Cultivation Suitability?

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Asian Agricultural Research 2013年第12期5卷 59-64页

作者： Wenxi LI Yueping ZHANG Changsong WANG Wei MAO Tianwen HANG Ming CHEN Bingning ZHANG Yangzhou station of soil and fertilizer Yizheng station of soil and fertilizer

To rationally allocate farmland resources,and scientifically make farming industrial planning,we take Yizheng City in Jiangsu Province as the research object,and select 13 *** on Farmland Resources Management Information System in Yizheng City,we establish AHP model,and membership function model,for the evaluation of farmland suitability of *** results show that the farmland area in the highly suitable areas accounts for 10.2%of the total farmland area;the farmland area in the suitable areas accounts for 56.08%of the total farmland area;the farmland area in the marginally suitable areas accounts for 25.50%of the total farmland area;the farmland area in the unsuitable areas accounts for 8.22%of the total farmland *** is significant positive correlation between the actual yield of rice surveyed and suitability index obtained through evaluation(R2=0.1964,319 samples);the actual yield of rice in the highly suitable areas is higher than in the marginally suitable areas and suitable areas,and the rice yield is the lowest in the unsuitable areas.

关键词： Rice Farmland suitability Suitability index Evalua

Comparison of potential potassium leaching associated with organic and inorganic potassium sources in different arable soils in China

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Pedosphere 2022年第2期32卷 330-338页

作者： Dianjun LU Yanhong DONG Xiaoqin CHEN Huoyan WANG Jianmin ZHOU State Key Laboratory of soil and Sustainable Agriculture Institute of Soil ScienceChinese Academy of SciencesNanjing 210008China University of Chinese Academy of Sciences Beijing 100049China soil and fertilizer station of Shandong Province Jinan 250100China

Potassium (K) leaching is detrimental to the maintenance of sustainable arable soil K fertility,especially in low-K fixation *** is not known whether the application of inorganic fertilizers with lower K mobility or crop straw can reduce potential K leaching in low-K fixation arable *** potential K leaching of 14 representative arable soils with different K fixation capacities in China was evaluated with or without the addition of K under two rainfall intensities (90 and 225 mm),and then potential K leaching was assessed in relation to five K sources (KCl,K_(2)SO_(4),KH_(2)PO_(4),maize (Zea mays L.) straw,and rice (Oryza sativa L.) straw).Without K addition,K leaching mainly occurred in sandy soils at 90 mm of rainfall and in soils with greater organic matter at225 mm of *** K addition,the leaching percentage of exogenous K ranged from 0.6%to 11.6%at 90 mm of rainfall and 1.2%to 21.2%at 225 mm of *** greatest K leaching occurred in soils with fewer K-bearing minerals and lower pH at both rainfall *** most cases,KH_(2)PO_(4),which has lower K mobility,markedly reduced K leaching in both high-and low-K leaching soils at the two rainfall *** and rice straw reduced K leaching only in soils with high K leaching,regardless of rainfall amount,whereas more K was leached in soils with lower K leaching at high rainfall *** conclusion,KH_(2)PO_(4) and straw should be preferred for reducing K leaching in low-K fixation arable soils.

关键词： crop straw K-bearing mineral K fixation K source soil type

Effects of Long-Term Winter Planted Green Manure on Distribution and Storage of Organic Carbon and Nitrogen in Water-Stable Aggregates of Reddish Paddy soil Under a Double-Rice Cropping System

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Journal of Integrative Agriculture 2014年第8期13卷 1772-1781页

作者： YANG Zeng-ping ZHENG Sheng-xian NIE Jun LIAO Yu-lin XIE Jian soil and fertilizer Institute of Hunan Province Hunan Academy of Agricultural Sciences Scientifi c Observing and Experimental station of Arable Land Conservation (Hunan) Ministry of Agriculture

In agricultural systems, maintenance of soil organic matter has long been recognized as a strategy to reduce soil degradation. Manure amendments and green manures are management practices that can increase some nutrient contents and improve soil aggregation. We investigated the effects of 28 yr of winter planted green manure on soil aggregate-size distribution and aggregateassociated carbon（C） and nitrogen（N）. The study was a randomized completed block design with three replicates. The treatments included rice-rice-fallow, rice-rice-rape, rice-rice-Chinese milk vetch and rice-rice-ryegrass. The experiment was established in 1982 on a silty light clayey paddy soil derived from Quaternary red clay（classified as Fe-Accumuli-Stagnic Anthrosols） with continuous early and late rice. In 2009, soil samples were collected（0-15 cm depth） from the field treatment plots and separated into water-stable aggregates of different sizes（i.e., 〉5, 2-5, 1-2, 0.5-1, 0.25-0.5 and 〈0.25 mm） by wet sieving. The long-term winter planted green manure significantly increased total C and N, and the formation of the 2-5-mm water-stable aggregate fraction. Compared with rice-rice-rape, rice-rice-Chinese milk vetch and rice-rice-ryegrass, the rice-rice-fallow significantly reduced 2-5-mm water-stable aggregates, with a significant redistribution of aggregates into micro-aggregates. Long-term winter planted green manure obviously improved C/N ratio and macro-aggregate-associated C and N. The highest contribution to soil fertility was from macro-aggregates of 2-5 mm in most cases.

关键词： green manure organic carbon reddish paddy soil total nitrogen water-stable aggregates

Strategic Measures for Implementing 300 Demonstration Projects to Lead the Construction of Modern Agricultural Industrial Clusters with Output of 100 Billion Yuan

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Asian Agricultural Research 2018年第11期10卷 14-22页

作者： Ying GAO Changjia PENG Fengyuan LI Jun LUO Jiawei DU Feng LUO Ning LU nanchong Agricultural Information Service station Nanchong 637000 China nanchong National Modern Agriculture Management Committee Office Nanchong 637000 China nanchong Plant Protection and Quarantine station Nanchong 637000 China nanchong Sericulture Management station Nanchong 637000 China nanchong soil and fertilizer station Nanchong 637000 China

To carefully implement the rural revitalization strategy,further promote the structural reform of the agricultural supply front,implement the "155 Development Strategy",speed up the cultivation of the modern agricultural industrial clusters with output of 100 billion yuan,and constantly consolidate the industrial foundation of the " Second City in Chengdu-Chongqing Line",the Municipal Party Committee and the Municipal Government of nanchong City decided to implement the " 300 Demonstration Projects" of modern agriculture. It firmly grasps the " bull nose"( key part) of the project,energetically implements the construction of 100 modern circular agricultural demonstration parks,100 agricultural leading enterprises with output value of 100 billion yuan,and 100 agricultural new business model demonstration projects( hereinafter referred to as 300 Demonstration Projects),to realize the goal of the output value of the modern agriculture industrial clusters of nanchong City exceeds 100 billion yuan in 2020.

关键词：农村振兴战略供应链结构改革

Spatial-temporal differentiation and influencing factors of rural settlements in mountainous areas: an example of Liangshan Yi Autonomous Prefecture, Southwestern China

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Journal of Mountain Science 2024年第1期21卷 218-235页

作者： WANG Yumeng DENG Qingchun YANG Haiqing LIU Hui YANG Feng ZHAO Yakai School of Geographical Sciences China West Normal UniversityNanchong 637009China Sichuan Provincial Engineering Laboratory of Monitoring and Control for soil Erosion in Dry Valleys China West Normal UniversityNanchong 637009China Liangshan soil Erosion and Ecological Restoration in Dry Valleys Observation and Research station Xide 616753China

Rural settlement is the basic spatial unit for compact communities in rural area. Scientific exploration of spatial-temporal differentiation and its influencing factors is the premise of spatial layout rationalization. Based on land use data of Liangshan Yi Autonomous Prefecture(hereinafter referred to as Liangshan Prefecture) in Sichuan Province, China from 1980 to 2020, compactness index, fractal dimension, imbalance index, location entropy and the optimal parameters-based geographical detector(OPGD) model are used to analyze the spatial-temporal evolution of the morphological characteristics of rural settlements, and to explore the influence of natural geographical factors, socioeconomic factors, and policy factors on the spatial differentiation of rural settlements. The results show that:(1) From 1980 to 2020, the rural settlements area in Liangshan Prefecture increased by 15.96 km^(2). In space, the rural settlements are generally distributed in a local aggregation, dense in the middle and sparse around the periphery. In 2015, the spatial density and expansion index of rural settlements reached the peak.(2) From 1980 to 2020, the compactness index decreased from 0.7636 to 0.7496, the fractal dimension increased from 1.0283 to 1.0314, and the fragmentation index decreased from 0.1183 to 0.1047. The spatial morphological structure of rural settlements tended to be loose, the shape contour tended to be complex, the degree of fragmentation decreased, and the spatial distribution was significantly imbalanced.(3) The results of OPGD detection in 2015 show that the influence of each factor is slope(0.2371) > traffic accessibility(0.2098) > population(0.1403) > regional GDP(0.1325) > elevation(0.0987) > poverty alleviation(0). The results of OPGD detection in 2020 show that the influence of each factor is slope(0.2339) > traffic accessibility(0.2198) > population(0.1432) > regional GDP(0.1219) > poverty alleviation(0.0992) > elevation(0.093). Natural geographical facto

关键词： Rural settlements Location entropy Geographical detector Spatiotemporal differentiation Influencing factors

soil Nutrients in Intensive Agricultural Areas with Different Land-Use Types in Qingzhou County, China

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Pedosphere 2007年第2期17卷 165-171页

作者： ZHAO Geng-Xing LI Xiu- Juan WANG Ri-Yan LI Tao YUE Yu-De College of Resources and Environment Shandong Agricultural University Tai＇an 271018 （China）. soil ＆ fertilizer Working station of Shandong Jinan 250100 （China） Qingzhou Agricultural Bureau Qingzhou 262500 （China）

On the basis of the data obtained from a field survey, the relationship between land use and soil nutrients was evaluated in Qingzhou County, Shandong Province, China, through a statistical analysis of differences in 17 nutrients in five types of cultivated land. The results showed significant effects (P soil organic matter and concentration of macronutrients, secondary nutrients, and micronutrients, as well as total salt and soil pH. In vegetable land, because of the large amounts of fertilizer applied to vegetable crops, the concentrations of most soil nutrients, with exception of available Si and micronutrients, were higher than those in grain cropland. Grain cropland had a significantly lower total salt content (P soil pH than vegetable land. Within subtypes of land use, dry land, irrigable land, and open-air vegetable land had the highest coefficient of variation (CV) for available P, whereas protected vegetable land had the highest CV for total N and available S. In general, land-use types had greater impact on macronutrients than on secondary nutrients and micronutrients.

关键词： cultivated land land-use type Qingzhou County soil nutrients

Spatial Prediction of Heavy Metal Pollution for soils in Peri-Urban Beijing, China Based on Fuzzy Set Theory

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Pedosphere 2006年第5期16卷 545-554页

作者： TAN Man-Zhi XU Fang-Ming CHEN Jie ZHANG Xue-Lei CHEN Jing-Zhong State Key Laboratory of soil and Sustainable Agriculture Institute of Soil Science Chinese Academy of Sciences Nanjing 210008 （China） Graduate school of the Chinese Academy of Sciences Beijing 100039 Chengdu University of Technology Chengdu 610059 （China） Nanjing station of soil and fertilizer Nanjing 210036 （China）

Fuzzy classification combined with spatial prediction was used to assess the state of soil pollution in the peri-urban Beijing area. Total concentrations of As, Cr, Cd, Hg, and Pb were determined in 220 topsoil samples （0-20 cm） collected using a grid design in a study area of 2 600 kin2. Heavy metal concentrations were grouped into three classes according to the optimum number of classes and fuzziness exponent using the fuzzy comean （FCM） algorithm. Membership values were interpolated using ordinary kriging. The polluted soils of the study area induced by the measured heavy metals were concentrated in the northwest corner and eastern part, especially the southeastern part close to the urban zone, whereas the soils free of pollution were mainly distributed in the southwestern part. The soils with potential risk of heavy metal pollution were located in isolated spots mainly in the northern part and southeastern corner of the study region. The FCM algorithm combined with geostatistical techniques, as compared to conventional single geostatistical kriging methods, could produce a prediction with a quantitative uncertainty evaluation and higher reliability. Successful prediction of soil pollution achieved with FCM algorithm in this study indicated that fuzzy set theory had great potential for use in other areas of soil science.

关键词： continuous classification fuzzy c-means heavy metal soil pollution spatial prediction