The findings indicated that, to choose suitable plants and the disposition proportion in Cropland to Forest were more advantageous to the soil fertility enhancement.

• 摘要对青海大通县北川河流域退耕还林地土壤化学性质研究结果表明，退耕还林中选择适宜的树种及配置比例更有利于土壤肥力的提高。