炼山后间种绿肥对杉木林退化地的改良效果

Effect of intercorpping green manure crops on degraded soil improvement of Chinese fir plantation after control burning

针对传统炼山清理迹地短期内速效养分大量增加, 随后雨季来临, 地表裸露引起严重水土流失的现实, 通过建立径流场, 进行间种绿肥对杉木林退化地水土流失、土壤肥力及林木生长影响进行定位研究。结果表明: 在杉木炼山林地间种不同种类的绿肥可减少林地17-76 % ～52-25 % 的土壤侵蚀量, 而且间种绿肥后林地物理性质及养分状况得到一定的改善, 林地表层土壤养分大量富集, 提高了林地养分有效性和供应水平, 同时间种绿肥对杉木幼林生长有一定促进作用。因此炼山后间种绿肥是值得南方林区大力推广的杉木传统炼山制度变革技术。表7

Effect of intercorpping green manure crops on water and soil losses,soil fertility and tree growth are studied through runoff plots due to serious soil erosion after control burning.The results are as follows:intercropping different green manure crops can control soil erosion,improve soil physical properties and nutrients conditions,and enhance tree growth of Chinese fir.The soil erosion of intercropping land has decreased by 17 76%～52 25% compared with that of control burning land.Therefore,intercorpping green manure crops after control burning is a practical technique in the south of China.