作　　者： ; ; ; ;

机构地区： 华南农业大学林学院

出　　处： 《土壤学报》 2003年第2期280-285,共6页

摘　　要： 研究了尾叶桉、马占相思、柚木、落羽杉纯林及黎蒴栲和湿地松、红荷和湿地松、黎蒴栲和加勒比松针阔混交林的土壤养分含量、微生物数量和酶活性。结果表明 :与马尾松纯林相比 ,马占相思、柚木、落羽杉纯林及针阔混交林能显著增加有机质和土壤养分 ,而尾叶桉纯林的效果随养分种类而异。黎蒴栲×湿地松混交林地及尾叶桉林地的微生物数量小于马尾松纯林地 ,其余林地的微生物数量大于后者。除了尾叶桉林地和马占相思林地外 ,其他林地的酶活性大于马尾松纯林地。总的来看 ,尾叶桉纯林改良土壤效果不佳 ,其他 6种人工林可以提高土壤肥力 ,防止地力衰退。 Summary The nutrient concentrations, microorganisms and enzyme activities of soil in pure Eucalypyus urophylla, Acacia mangium, Tectona grandis, Taxodium distichum stands and in mixed stands of Castanopsis fissa and Pinus elliottii, Schima wallichii and Pinus elliottii, Castanopsis fissa and Pinus caribaea were studied. The results show that compared with P. massoniana stand, A. mangium , T. grandis, T. distichum stands and mixed stands with conifer and broadleaf tree could increase organic matter content and improve the nutrient status of soil, whereas the effect of E. urophylla changed with nutrient type. The microorganism amount of P. massoniana stand soil was bigger than those of mixed stand soil of C. fissa and P. elliottii and pure stand soil of E. urophylla , but it was smaller than those of other stand soils. Except for E. urophylla stand soil and A. mangium stand soil, the enzyme activities of other stand soils were bigger than those of P. massoniana stand soil. In a word, E. urophylla was not good at improving soil fertility, whereas other stands could improve soil fertility.

关 键 词： 土壤养分 林分 微生物 酶活性 纯林 混交林

领　　域： [农业科学]