通过对土壤质地分析表明，延边地区大部分苹果梨园土壤为壤质粘土。

The analysis on the texture of soil indicated the mostly Apple-pear orchards' soil of yanbian area was clay.

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首先，用批量平衡法开展了镉在砂质壤土、壤质砂土和粉壤土中的吸附特性的试验研究，获得吸附常数；

First, to characterize the adsorption property of cadmium, cadmium adsorption isotherms in soils were determined by the batch experiment, and the adsorption parameters were obtained;

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轻壤质土壤中碱性酸酶活性低于轻粘质土壤中的酶活性。贫磷土壤中磷酸酶活性高于富磷土壤中磷酸酶的活性。

The alkaline phosphatase activity in light clayey soil is higher than that in light loamy soil, also is higher in poor-phosphate soil than in rich-phosphate soil.

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