文献类型: 外文期刊
第一作者: Wang Di
作者: Wang Di;Chen Zhongxin;Zhou Qingbo;Liu Jia
作者机构:
关键词: spatial sampling;winter wheat;sown area;sample size;extrapolation;error analysis
期刊名称:2012 FIRST INTERNATIONAL CONFERENCE ON AGRO-GEOINFORMATICS (AGRO-GEOINFORMATICS)
ISSN: 2334-3168
年卷期: 2012 年
页码:
收录情况: SCI
摘要: it is essential for grain production, trade and grain security warning that the information on crop sown area is collected timely and accurately at regional and national level. The experiment on optimal design of spatial sampling schemes for estimating winter wheat sown acreage was conducted combining Remote Sensing, Geographic Information Systems with the traditional sampling methods as well as Geostatistics theory, in order to improve the current crop acreage sampling survey systems. Mengcheng County was selected as study area in Anhui Province, China and winter wheat sown area as the study object. 5 kinds of spatial sampling schemes (simple random sampling, spatial random sampling, classical systematic sampling, spatial systematic sampling and stratified sampling) were designed, respectively. Relative error, coefficient of variation (CV) and sampling costs (represented by sample size) were selected as indices to evaluate the efficiency of spatial sampling schemes in the experiment. The experimental results demonstrate that, the efficiency of stratified sampling scheme is the highest among 5 spatial sampling schemes, which the ratio of winter wheat sown area accounting for the area of a square grid in a sampling fundamental unit (that is a square gird with a size of 5'x5') was selected as the stratification symbol; Sample size, relative error and CV of population total estimators decrease with numbers of stratum increasing, when stratified sampling scheme is used to extrapolate population values and estimate sampling error; Furthermore, when the number of stratum is 5, sample size, relative error and CV of population total estimators are minimum compared with the rest results of stratified sampling schemes at 5 stratification levels
分类号:
- 相关文献
作者其他论文 更多>>
-
Three Dimensional Fluorescence Characteristics of Soluble Organic Matter From Different Straw Decomposition Products Treated With Calcium Containing Additives
作者:Xia Ming-ming;Wu Meng;Fan Jian-bo;Liu Xiao-li;Chen Ling;Ma Xin-ling;Li Zhong-pei;Liu Ming;Xia Ming-ming;Wu Meng;Fan Jian-bo;Liu Xiao-li;Chen Ling;Ma Xin-ling;Li Zhong-pei;Liu Ming;Liu Jia
关键词:Calcium containing additives; Straw; Dissolved organic matter; 3DEEM; Parallel factor analysis
-
Effect of Exogenous Abscisic Acid (ABA), a Potential Growth Regulator on Physiological Response to Chilling Stress of Adzuki Bean (Vigna angularis) at Flowering Stage
作者:Xiang Hong-Tao;Xie Hong-Chang;Wang De-Ming;Xiang Hong-Tao;Li Wan;Liu Jia;He Ning;Wang Xue-Yang;Li Bo;Li Wan;Li Bo
关键词:Adzuki bean; Anti-adversity defense system; Chilling; Exogenous ABA; Yield.
-
Assembly and co-occurrence patterns of rare and abundant bacterial sub-communities in rice rhizosphere soil under short-term nitrogen deep placement
作者:Li Gui-long;Wu Meng;Li Peng-fa;Wei Shi-ping;Liu Jia;Jiang Chun-yu;Liu Ming;Li Zhong-pei;Li Gui-long;Wu Meng;Li Peng-fa;Wei Shi-ping;Liu Ming;Li Zhong-pei;Liu Jia
关键词:rare bacteria; community assembly; network analysis; co-occurrence patterns; N deep placement
-
Bacterial diversity and community composition changes in paddy soils that have different parent materials and fertility levels
作者:Ma Xin-ling;Jiang Chun-yu;Wu Meng;Liu Ming;Li Zhong-pei;Ma Xin-ling;Jiang Chun-yu;Wu Meng;Liu Ming;Li Zhong-pei;Liu Jia;Chen Xiao-fen;Li Wei-tao
关键词:microorganisms; soil biodiversity; soil fertility; soil texture; soil nutrients
-
Hydrophilic interaction liquid chromatography for removal of pesticide residues in ginseng extracts
作者:Sun Lingli;Liu Jia;Duan Zhengchao;Wang Lianzhi;Wang Chaoran;Guo Xiujie;Wang Chaoran;Wu Lidong
关键词:hydrophilic interaction liquid chromatography ( HILIC); ginsenosides; pesticide residues; ginseng extracts; removal method
-
Soil application of Trichoderma asperellum GDFS1009 granules promotes growth and resistance to Fusarium graminearum in maize
作者:He An-le;Liu Jia;Wang Xin-hua;Chen Jie;Zhang Quan-guo;Song Wei
关键词:Trichoderma asperellum; maize; Fusarium graminearum; stalk rot; biocontrol agent
-
Modeling the spatio-temporal changes in land uses and its impacts on ecosystem services in Northeast China over 2000-2050
作者:Xia Tian;Wu Wenbin;Zhou Qingbo;Yang Peng;Xia Tian;Tan Wenxia;Verburg, Peter H.;Ye Liming;Ye Liming
关键词:Northeast China; land use; spatio-temporal change; scenario; ecosystem service