塔里木沙漠公路防护林土壤酶分布特征及其与有机质的关系

对咸水灌溉条件下的塔里木沙漠公路防护林土壤酶活性及其对土壤有机质的影响进行的研究表明:人工绿地建成后,土壤结构和养分状况得到改善,土壤酶活性大幅提高,并且在时间和空间分布上呈现明显的规律性。通径系数分析显示,土壤蛋白酶对土壤有机质直接作用最大,其余依次为中性磷酸酶、脲酶、转化酶、碱性磷酸酶和过氧化氢酶。中性磷酸酶—碱性磷酸酶、碱性磷酸酶—中性磷酸酶、脲酶—中性磷酸酶、蛋白酶—中性磷酸酶之间的间接作用对土壤有机质动态影响较大,其余土壤酶间的作用相对不显著。

Distribution Characteristics of Soil enzymes of Talimu Desert Highway Shelter-Forest and Their Relations with Soil Organic Matter

The distribution laws of soil enzymes of Talimu Desert Highway Shelter-forest and the effects of soil or- ganic matter on them were studied. The results show that the activities of soil enzymes increased sharply, the dis- tribution of soil enzymes had distinct laws with time elapse and variation of space,and soil structure and nutrient status were improved with greenbelt set up under condition of irrigating by saline water. By analysis of path coef- ficient, soil proteinase had the largest direct effect on soil organic matter, neutral phosphatase, uraease, invertase, alkline phosphatase and catalase ranked in order. The interactions between pairs of neutral phosphatase-alkline phosphatase, alkline phosphatase-neutral phosphatase, uraease-neutral phosphatase, proteinase-neutral phos- phatase had larger effects on soil organic matter.