【摘要】 桉树连栽人工林地的地表枯枝落叶层中 ,干物质和各种养分贮藏量与次生阔叶林和厚荚相思林比较明显下降 ,土壤有机质 ,全 N量和碱解 N含量随土壤剖面深度增加也出现下降趋势 .传统的砍、烧、机耕整地使桉树林地的枯枝落叶和养分库呈突变形式退化 .林分组成单一 ,凋落物数量和养分含量少 ,也是桉树林地土壤有机物的养分库退化的原因 .通过改变林分组成和施肥 ,可以控制人工桉树林地有机物和养分库的退化 ,提高人工林地的生产力 .更多还原

【Abstract】 It was reported that under EF (artificial eucalyptus continual forest ),there were evident drops of litter matter and all nutrients on litter layer of soil surface compared with secondary broad leaved forest and Acacia crassicarpa. And similar drop trends of soil organic matter content and total N and hydrolyzed N were found with the increment of soil profile distribution. The degradations of litter layer and nutrient pool under EF were abrupt as the traditional reforestation like cutting, firing and machinery management was implemented. In addition, a unitary composition of standing forest with less litter and nutrients returned to soil is another factor. By changing forest component and using mineral elements to promote the transfer to organic component, the degradation of soil organic matter and nutrient pool could be controlled, thus improving the productivity of artificial eucalyptus forest.更多还原