杉木幼林地水土保持措施效果的研究

Study on Effects of Water and Soil Conservation Measure on Sites of Young Chinese Fir Plantation

通过建立２８个径流小区，对杉木幼林地水土保持措施效果的定位研究结果表明：杉木幼林地植被覆盖层的破坏是导致林地严重水土流失的主要原因．迹地采伐剩余物具有较大的涵养水源功能．保留采伐剩余物的杉木纯林、马尾松纯林及杉木×火力楠混交林迹地的土壤侵蚀量分别可比炼山迹地减少９９．１４％、９８．８０％和９８．２０％，在杉木炼山后及时间种绿肥可减少林地１７．５７％～５２．２５％的土壤侵蚀量，四种林地套种方式中以日本草×决明豆混播类型防治水土流失效果为最佳．

Researches into the effects on different measures to control soil erosion on twenty eight runoff plots show that lack of plantcover on sites of Chinese fir plantation is the main reason that cause serious wa ter and soil losses, the slash on site has singnificant waterholding capacity, annual losses on slash-remaining sites such as Cunningghamia lanceolata pure plantation, Pinus massoniana pure plantation and mixed stand of Cunninghamia lanceolata and Michelia macclurei can reduced by 99.14%, 98.80%, and 98.20% respectively. Compared with non-intercropping site, the losses on intercropping various green manures site after control burning can be reduced by 17. 57%～52. 75%.