The regression equations between soil enzyme activities and chemical properties were obtained by using a stepwise regression method. 用土壤化学性质对各种酶活性进行逐步回归分析，可以得到理想的方程。
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。
