【摘 要】
：
In Japanese cedar plantations, forest management strategies to minimize soil degradation including acidification need to be established. Both clear-cutting and stem girdling (removal of bark and phloe
【机 构】
：
Graduate School of Agriculture,Kyoto University,Kyoto 606-8502,Japan;Forestry and Forest Products Re
【出 处】
：
International Symposium on Forest Soils(2013年森林土壤国际研讨会)
论文部分内容阅读
In Japanese cedar plantations, forest management strategies to minimize soil degradation including acidification need to be established. Both clear-cutting and stem girdling (removal of bark and phloem) have strong influences on organic matter cycling and these managements are hypothesized to increase soil acidification by the decreased plant uptake and increased nitrification. To evaluate the effects of clear-cutting or stem girdling on soil organic matter cycling and acidification processes, soil C budgets and proton budgets were analyzed for clearcut, girdling, and control treatments in a Japanese cedar plantation. The downward fluxes of nitrate leachingout of the soil profile were greatest in the clearcut treatment (4.7 N kg ha-l yr-l), compared to the girdling and control treatments (0.4 and 0.9 N kg ha-l yr-l, respectively). Soil acidification was mainly caused by cation plant uptake in control forest, whereas acidification was induced by net mineralization of soil organic N and subsequent nitrification in the clearcut soil. In girdling treatment, translocation of basic cations from canopy and organic layer to the mineral soil horizon contributed to soil alkalization. The processes of management-induced acidification are similar to the other reports, but their magnitude appeared to be small in Japanese cedar plantation at least within a few years after managements.
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