闽北不同土地利用方式水土流失与降雨历时的关系研究

Relationship between rainfall duration and loss of soil and water in diverse land-use types of Northern Fujian

运用径流小区观测法,研究了闽北坡地杉木林、锥栗林、果园及裸露对照地水土流失与降雨历时的关系,结果表明:降雨历时与径流量呈极显著的线性相关,但相关系数较低,而与土壤流失次数、土壤流失量均无明显的相关性;历时较长的降雨在所有土地利用方式中均产生较多的径流量,历时较短的降雨对缺乏植被覆盖土地的土壤流失量产生较大影响,而对植被覆盖良好的土地影响较小;在长历时的降雨条件下,植被的水土保持作用将被削弱.

The relationship between rainfall duration and loss of soil and water in diverse land-use types（Chinese fir forest,Castanea henryi forest,orchard,etc.）in Northern Fujian was investigated with establishment of runoff plot.The results indicate that the extremely significant linear correlation between rainfall duration and runoff amount was observed,whereas there were non-significant correlations between rainfall duration and time and amount of soil loss.Rainfall with short duration affected soil loss in bared lands greatly and the role of vegetation in soil and water conservation was weakened with long-time rainfall.