数字农科院2.0

Spatio-temporal dynamics of maize cropping system in Northeast China between 1980 and 2010 by using spatial production allocation model

文献类型： 外文期刊

作者： Tan Jieyang;Yang Peng;Wu Wenbin;Zhang Li;Li Zhipeng;Tang Huajun;Li Zhengguo;Liu Zhenhuan;You Liangzhi

作者机构：

关键词： spring maize;spatial production allocation model;spatio-temporal pattern;Northeast China

期刊名称： JOURNAL OF GEOGRAPHICAL SCIENCES

ISSN： 1009-637X

年卷期： 2014 年 24 卷 3 期

页码：

收录情况： SCI

摘要： Understanding crop patterns and their changes on regional scale is a critical requirement for projecting agro-ecosystem dynamics. However, tools and methods for mapping the distribution of crop area and yield are still lacking. Based on the cross-entropy theory, a spatial production allocation model (SPAM) has been developed for presenting spatio-temporal dynamics of maize cropping system in Northeast China during 1980-2010. The simulated results indicated that (1) maize sown area expanded northwards to 48 degrees N before 2000, after that the increased sown area mainly occurred in the central and southern parts of Northeast China. Meanwhile, maize also expanded eastwards to 127 degrees E and lower elevation (less than 100 m) as well as higher elevation (mainly distributed between 200 m and 350 m); (2) maize yield has been greatly promoted for most planted area of Northeast China, especially in the planted zone between 42 degrees N and 48 degrees N, while the yield increase was relatively homogeneous without obvious longitudinal variations for whole region; (3) maize planting density increased gradually to a moderately high level over the investigated period, which reflected the trend of aggregation of maize cultivation driven by market demand.

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