传统农业区土地利用对土壤氮素季节动态变化的影响——以官厅水库上游延庆盆地为例
전통농업구토지이용대토양담소계절동태변화적영향——이관청수고상유연경분지위례
Effect of land use on seasonal dynamics of soil nitrogen in traditional agricultural area of China: A case study in Yanqing basin
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