高寒山区退耕还林不同年限土壤理化性质研究——以青海省大通县为例
고한산구퇴경환림불동년한토양이화성질연구——이청해성대통현위례
Improvement of Soil Physical and Chemical Properties after "Conversion of Farmland to Forest" in Alpine Areas——Take Datong County of Qinghai Province as an Example
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