辽西水土保持林土壤改良效应的研究

通过分析比较油松纯林和油松-固N树种混交杯土壤的理化性质和油松生长量，结果表明，油松-固N树种混交杯土壤有机质含量、全N、全P、速效P和水解N含量都比油松纯林显著提高，土壤容重减小，硬度降低，初渗速度增大．油松胸径和树高生长量也有较明显提高，对土壤的改良作用比油松纯林效果更加显著．通过土壤酶活性和固N树种固N活性的测定，对不同水土保持林的土壤肥力状况作出了综合评价。

Effect of water and soil conservation forest on soil improvement in western Liaoning Province

Comparative studies on the soil physical and chemical properties and Chinese pine growth inChinese pine pure forest and Chinese pine-N fixers mixed forest show that the contents of organic matter, total N, total P. Olsen-P and available N were higher in mixed than in pure forest soil. In mixed forest soil, its bulk density and hardness decreased. and the initial penetration speed increased; thc growth of height and diameter at breast height of Chinese pine wasfaster in mixed forest, indicating that this forest was more effective on soil improvement. Basedon thc measurement of soil cnzyme activity and N-fixing capacity, the soil fertility 1evel of different water and soil conservation forests was evaluated comprehensively.