农牧交错区耕地净第一性生产力动态变化研究——以陕西榆林市榆阳区为例
농목교착구경지정제일성생산력동태변화연구——이협서유림시유양구위례
Study on the dynamic changes of net primary productivity of cultivated land in pasturing-farming region——A case over Yuyang district
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