杉木幼林生态系统水文效应研究

在福建尤溪建立１２个迳流场进行杉木幼林生态系统降雨的树冠截留、树干截留及水土流失的定位研究，结果表明：杉木幼林生态系统是通过林冠及树干截留对降雨的再分配而表现出涵养水源、保持水土功能．６年生杉木幼林平均林冠截留率１５．７４％，树干截留率１．７５％．在９～１２ｍｍ雨量级条件下，杉木幼林可延缓迳流形成３～２６ｍｉｎ、迳流高峰２～１５ｍｉｎ，保留杉木幼林采伐剩余物林地可比炼山林地减少６８．０４％的地表迳流和９４．９２％的土壤侵蚀量．

Study on Hydrological Benefit of the Ecosystem of Thicket Chinese Fir Plantation

Through the fixed-position observation of twelve runoff plots in youxi county of Fujian province,the precipitation,interception of canopy,stemflow,soil erosion of the ecosystem of thicket Chinese fir plantation have been studied, with the results being as follows:The average rate of canopy interception is 15. 74% in the six-year-old plantation of Chinese fir,and the average stemflow rate 1. 75%;the gathering of runoff and the appearing of flood peak can be postponed by 3～26 minutes and 2～25 minutes respectively;the losses of water and soil of the ecosystem of thicket Chinese fir plantation,in which slash remain,can be reduced by 68.04% and 94.92% respectively in comparison with that of the controlled burnned site.