杉木世行造林水土流失及土壤肥力监测

通过建立２８个不同营林措施的径流小区，对杉木世行造林地水土流失及土壤肥力进行定位研究．结果表明：炼山清理迹地造林导致了林地严重水土流失，林地６年的水、土、肥流失分别是不炼山林地的３．１、１９．７和６．１倍；穴状整地造林可比全垦、带垦整地减少３７．６５％和２３．４２％的土壤侵蚀量；扩穴连带抚育水保效果不明显．杉木世行造林模式可比传统造林模式减少７．７６％的土壤侵蚀量和１１．３５％的液体径流量，造林后林地表层养分指标呈下降趋势，主要是林地水土流失引起的．

Supervision on Soil and Water Losses and Soil Fertility in Chinese Fir Plantation by World-bank-culture Method

In Chinese fir plantation planted with World-bank-culture method, which costs of silviculture were provided by world Bank, located determination of soil and water losses, and soil fertility in twenty-six runoff plots treated with different cultural measures showed that: control burning caused great losses of soil and water, the lossee of water, soil and nutrient in burned land were 3.1, 19.7, and 6.1 times as much as those in no-burned land. The soil erosion caused by pit-like site preparation reduced by 37. 65% and 23. 42% respectively compared with those caused by allover site preparation and strip-like site preparation. The soil erosion and water losses in plantation planted by World-bank-culture method reduced by 7. 76%. and 11. 35% respectively compared with those by traditional culture method. The decrease of soil nutrienfs after silviculture resulted from soil and water losses.