华北平原五省冬小麦产量和氮素管理的时空变异

任思洋,张青松,李婷玉,张福锁

Spatiotemporal Variation of Winter Wheat Yield and Nitrogen Management in Five Provinces of North China Plain

SiYang REN,QingSong ZHANG,TingYu LI,FuSuo ZHANG

表1 华北五省各年调研农户样本容量

Table 1 The survey sample size of farmers in each year in five countries in the North China Plain

年份 Year 安徽北部 Northern Anhui 河北 Hebei 山东 Shandong 江苏北部 Northern Jiangsu 河南 Henan 农户数量（N） Number of small holder farmers (N) 2005 2025 21216 7567 3913 42933 77654 2006 9511 38349 46440 20204 82689 197193 2007 27412 47216 70202 7143 124143 276116 2008 30832 87365 88436 6005 117776 330414 2009 11883 71140 32698 3837 61414 180972 2010 8437 29377 26567 3497 40310 108188 2011 3701 22846 25849 2451 19958 74805 2012 2707 19783 23998 2245 12127 60860 2013 8163 16652 24474 2931 18401 70621 2014 949 6051 1790 2252 1137 12179 总计Total 105620 359995 348021 54478 520888 1389002