色季拉山典型林分枯落物持水性能研究

A Study of the Water-Holding Capacity of Typical Forest Litter of the Sejila Mount

本文通过对色季拉山四种典型林分枯落物持水性能进行研究,结果表明:枯落物总蓄积量范围在57.0 t·hm-2～173.78 t·hm-2,林芝云杉﹥川滇高山栎﹥高山松﹥西藏箭竹。枯落物平均吸水速率林芝云杉﹥川滇高山栎﹥西藏箭竹﹥高山松;枯落物吸水速率与浸泡时间存在明显幂函数关系,持水量与浸泡时间存在明显对数函数关系;枯落物最大持水量和最大持水率均为林芝云杉﹥高山松﹥川滇高山栎﹥西藏箭竹。上层枯落物有效拦蓄率和有效拦蓄量高山松均为最大,有效拦蓄率川滇高山栎最小,为71.83%,有效拦蓄量西藏箭竹林最小,为14.35 t·hm-2;下层枯落物的有效拦蓄率高山松最大,为198.95%,林芝云杉其次,为160.23%,西藏箭竹林最小,仅为高山松的30.2%,有效拦蓄量林芝云杉最大,为187.29 t·hm-2,川滇高山栎其次,西藏箭竹最小。

Based on studies of the water holding capacity of four typical forest litter on the Sejila Mount,the results showed that： The total storage capacity of litter ranged from 57.0 t·hm-2 to 173.78 t·hm-2,Picea Likiangensi var.linzhiensis〉Quercus aquifolioides〉Pinus densata〉Fargesia setosa.The average water absorption rate of litter was Picea Likiangensi var.linzhiensis〉Quercus aquifolioides〉Fargesia setosa〉Pinus densata;The water absorption rate of litter and the soaking time was an obvious power function.The moisture capacity increased logarithmically with the soaking time;Both of the total water holding capacity and proportional water holding capacity of litter were Picea Likiangensi var.linzhiensisPinus densata〉Quercus aquifolioides〉Fargesia setosa.Comparing effective holding capacity and effective holding quantity of rainfall of the four types of upper litters found that Pinus densata was the best.The modified interception rate of Quercus aquifolioides was the least（71.83%）.The modified interception of Fargesia setosa was the least（14.35 t·hm-2）.Comparing the modified interception rate of the four types of lower litters found that Pinus densata was the best（198.95%）,and Picea Likiangensi var.linzhiensis followed（160.23%）,Fargesia setosa was the least（only 30.2% of Pinus densata）.Comparing the modified interception of the four types of lower litters found that Picea Likiangensi var.linzhiensis was the best（187.29 t·hm-2）,and Quercus aquifolioides followed,Fargesia setosa was the least.