【摘要】 从高黎贡山不同土地类型土壤的理化特性及微生物特性 ,探讨了不同土地类型生态因子的变化及其对微生物生长代谢的作用 ,以及人类活动对微生物的影响。更多还原

【Abstract】 The Gaoligong Mountains are of momentous significance in biological research and to which attensions have been paid by many researchers because of its manifold forest types and biological resources. But, felling, herding and planting have damaged forests, resulted in deterioration of environment and land, and threatened the forests and biological resources in natural reserve because of increasing population. The variation patterns of soil microbial growth, metabolism and ecological factors, and the effects of the factors on soil microbes in different land types in Gaoligong Mountains were studied. The effects of anthropologic disturbance on soil microbe and nutrient contain were investigated. The aim is to provide scientific basis for forest management and biological diversity protection. Land falls into five types, of original forest, secondary forest, artificial plantation, field and waste land, corresponding to five states of landuse, i.e. original state, secondary forest type for the state of the original forest felled and herded, waste land is the state of forest damaged, and artificial plantation and field are two main use types of forest planted. The 11 soil_specimens from different land types were collected in August-September,1995, and microbial number, biochemical activities and nutrient contains in the soils were determined. The correlations between soil microbe and ecological factors were analysed. The influence of anthropologic disturbance on soil microbe and nutrient contains were discussed. The result shows that soil microbial growth and metabolism were highest under original forests, and decreased from original forests→secondary forests→ Cunninghamia lanceolata plantation, and lowest in waste land of all types. The metabolism activities were all lower in artificial plantations and field. The different degree of correlations were found between variations of ecological factors and soil microbes in different land types. The growth and metabolism of soil microbes were extreme significantly correlated with organic matter and effective nitrogen except cellulose decomposition, and significantly correlated with moisture and quick acting potassium except cellulose decomposition with moisture, but the correlation were not all statistically significant between growth and metabolism of soil microbes and quick acting phosphorus. The results revealed that the main ecological factors influencing the growth and metabolism of soil microbes in different land types were organic matter, effective nitrogen, moisture, quick acting potassium and quick acting phosphorus in sequence. Anthropologic disturbances influence soil microbe through altering ecological factor. It is found that the decreasing of organic matter input or decomposition speed and alteration of environmental condition are main reasons resulting in decreasing of microbial number, activities and nutrient contain and damaging of soil construction.更多还原