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()
)
图6. 2005-2014年华北分县冬小麦氮平衡及效率现状分析
每个点代表一个县,白色方点代表华北地区均值,样本量（n）为370
Fig. 6. Analysis of current status of wheat nitrogen management and nitrogen use efficiency in North China Plain from 2005 to 2014
Each point represents a county, the green dot represents the mean of the North China Plain with a sample size (n) of 370
