澜沧江上游典型退化山地土壤酶活性研究

对澜沧江上游洱源山区的典型退化山地土壤酶活性及其变化规律进行了研究,结果表明:不同土壤资源利用方式下,土壤酶活性存在显著差异,土壤蔗糖酶活性、脲酶活性和蛋白酶活性的变化趋势为旱冬瓜林>果园>云南松纯林>桉树林,土壤过氧化氢酶活性的变化趋势为云南松纯林>旱冬瓜林>果园>桉树林;相关性分析表明:土壤酶活性与土壤有机质和全氮含量存在正相关关系,土壤酶之间也存在共性关系,共同推动土壤肥力的发展;综合土壤有机质、全氮及土壤蔗糖酶活性、脲酶活性、蛋白酶活性和过氧化氢酶活性6项指标,运用因子分析法进行综合评价,表明旱冬瓜林土壤质量最优,果园、云南松纯林和桉树林土壤质量较差.

Soil Enzyme Activities of the Typical Degraded Mountainous Ecosystem in the upper Reach of the Lancang River

The soil enzyme activities and the change patterns of each soil enzyme from different soil utilization types in the typical degraded mountainous area of the upper reaches of the Lancang River were studied.The results showed that soil enzyme activities significantly differed from varied land utilization types.The activities of sucrase,urease and protease in the different ecosystems ordered as plantation of Alnus nepalensis> orchard> pure forest of Pinus yunnanensis> plantation of Eucalyptus spp..The activity of catalase had the order as pure forest of Pinus yunnanensis> plantation of Alnus nepalensis> orchard> plantation of Eucalyptus spp..It was showed by the correlation analyses that there were significant positive correlations among soil enzyme activity,organic material content and the content of total N in the soil,there were also certain correlations among the varied soil enzyme activities,and all these factors would contribute to the soil fertility development.The comprehensive evaluation on the 6 indexes,i.e.,organic material content,total N content,the activities of sucrase,urease,protease and catalase in the soils by the method of factor analysis showed that the integrated soil quality under the plantation of Alnus nepalensis was the best,and then followed by that of orchard,pure forest of Pinus yunnanensis and plantation of Eucalyptus spp..