西双版纳不同森林类型土壤肥力差异性研究

Research on the Difference of Soil Fertility in the Different Forest Types in Xishuangbanna

以西双版纳热带季节雨林、次生林、人工橡胶林为例,对pH值、有机质等12项土壤肥力指标进行了检测,并对3种林型土壤肥力差异状况进行了比较。研究结果表明:3种林型间土壤pH值差异未达到0.05的显著水平,有机质、全N、水解N、速效K差异达0.05的显著水平。NH4-N、NO3-N、全P、有效P、全K、缓效K、CEC差异达0.01的极显著水平。3种林型土壤肥力指标空间变异系数顺序为:全N>有机质>NH4-N>NO3-N>有效P>缓效K>速效K>水解N>CEC>全P>全K>pH值。3种林型土壤肥力的整体水平:次生林>人工橡胶林>季节雨林。

There is great difference in surrounding factors among different forest types because of both succession phase and conditions. In the long-term evolvement and development, especially, during the felling and building, the gap of soil fertility is very high. In this researeh, twelve soil fertility indexes were examined and the differences of three forest types were compared, the results showed that the difference of pH was not remarkable among three forest types, however, the differences of organic matter, total N, hydrolyzing N and quicking K reached significant（0.05）, the differences of NH4-N, NO3-N, total P,valid P, total K, chronic K and CEC were quite remar .kable, which reach 0.01 level. The spatial SD sequence of soil fertility in three forest types： total N 〉 organic matter 〉 NH4-N 〉 NO3-N 〉 valid P 〉 chronic K 〉 quicking K 〉 hydrolyzing N 〉 CEC 〉 total P 〉 total K 〉 pH .the whole level of soil fertility was the seeondary torest〉 manpower rubber forest 〉 seasonal rain forest.