马缨杜鹃林区枯落物与土壤持水量性研究

A STUDY ON LITTER LAYER AND HOLDING CAPACITY IN SOIL OF RHODODENDRON DELAVAYI FOREST

本文通过对贵州省大方县普底乡百里杜鹃林区马缨杜鹃林枯落物及土壤层的野外调查与室内分析,初步研究了该林分枯落物及林地土壤在水源涵养方面的作用。结果表明,马缨杜鹃林下枯落物未分解层持水量为其风干重的260%,半分解层的经持水量为其风干重的283%。经分析拟合,得到林下枯落物吸水速度与时间关系式Y=kt.n.林地A层土壤容重为0.88g/cm3,最大持水量为60.87%,毛管持水量为42.70%,田间持水量为23.27%。林地B层土壤容重为1.11g/cm3,最大持水量为41.87%,毛管持水量为33.53%,田间持水量为18.58%。

The effects of litter layer and forest soil on the water source conservation are studied when the hydrological effects of by investigating and analyzing the forest soil and litter layer in the R delavayi forest are analysed in Bailidujuan Pudi town in Dafang county ,Guizhou. The results show that the maximum water holding capacity of the undecom posed litter in R. delavayi forest is 260% of its dry weight, the maximum water holding capacity of the half- undecomposed litter in R. delavayi forest is 283% of its dry weight , .And the equation of the water ABSorption speed of in the litter layer and the immersing time is Y=kt^(n) .The density of soil of the A layer is 0.88g.cm^(-3 ),the maximum water holding capacity is 60.87%, the capillary holding capacity is 42.7%,and the field holding capacity is 23.27%. those items of the secondary Quercus acutissima forest soil are respectively 1.1g.cm^(-3),40.43%,29.73% and 25.50% . The density of soil of the B layer is 1.11g.cm^(-3 ), the maximum water holding capacity is 41.87%, the capillary holding capacity is 33.53%,and the field holding capacity is 18.58%.