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

TANG Yan-lin et al(Tropical Rainforest Ecosystem Station,Xishuangbanna Tropical Botanical Garden,Chinese Academy of Science,Mengla,Yunnan 666303)  
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 research,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 remarkable,which reach 0.01 level.The spatial SD sequence of soil fertility in three forest types: total Norganic matterNH4-NNO3-Nvalid Pchronic Kquicking Khydrolyzing NCECtotal Ptotal KpH.The whole level of soil fertility was the secondary forestmanpower rubber forestseasonal rain forest.
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