滇西典型退化山地不同利用类型土壤生化活性

采用野外采样及室内分析的方法，选取人为干扰较小的旱冬瓜(Alnus nepalensis)林作为对照，对不同利用方式下的土壤生化活性进行分析。结果表明：不同利用类型土壤生化活性之间存在较大差异；土壤生化活性，能比较客观地反映土壤肥力质量的差异和退化程度；除了蔗糖酶活性，不同利用类型的其他土壤生化活性指标均达到了显著影响水平；由土壤生化活性均随着土层深度的增加而降低可以看出，土壤利用类型、人为活动对土壤生化活性的影响主要集中在表层(A层)；除了氨化作用，不同土层对其他土壤生化活性指标均达到了显著影响水平。研究区旱冬瓜林土壤性状较好, 其他5 种利用类型土壤均存在不同程度的退化。

Soil biochemical activities under different land uses in typical degenerated mountainous region of western Yunnan

To understand the degradation degree of soil in different soil-utilization ways, with drought white gourd forest witless jamming as biochemical activity of soil with different utilization ways were analyzed by the method of field sampling and laboratory analysis. The results indicated that soil biochemical activities were different under different utilization types, which reflected the difference of soil fertilization and degradation degree. The different land utilization had significant effect on soil biochemical activities except for sugar activities. The effect of land utilization and human activities were mainly on the land surface (A layer) since the soil biochemical activities decreased along with the deepening of soil. Different land layer also had significant effect on soil biochemical activities except for ammonification. The soil characters in the drought white gourd forest was better than others, and the other S utilization types of soils had degradation at different degree.