不同森林类型枯落物水文生态功能对比研究--以甘肃祁连山和云南元阳梯田水源林为例

摘要

Taking water conservation forest of Qilian Mountains of Gansu Province and Yuanyang terrace of Yunnan Province as research object,through field investigation and comparison on data,result shows that:(1 )The average thickness and the average volume of litter is 3.1 7 cm & 27.67 t ·hm-2 ,respectively in Qilian Mountains;the aver-age thickness of litter is 2.33 cm and the average volume is 6.86 t·hm-2 in Yuanyang terrace.The average thick-ness and the average volume of the former is 1.4 and 4 times respectively larger than that of the latter.(2)The av-erage maximum water-holding capacity of litter is 79.01 t·hm-2 and the average maximum water holdup rate is 294.05% in Qilian Mountains;the average maximum water-holding capacity of litter is 4.76 t·hm-2 and the aver-age maximum water hold up is 1 73.46% in Yuanyang terrace;the average maximum water-holding capacity and the average maximum water hold up rate of the former is 1 6.61 and 1.7 times larger respectively than that of the latter.%选择甘肃祁连山和云南省元阳梯田水源林枯落物为研究对象,对野外调查数据进行对比分析,结果表明：(1)祁连山枯落物平均厚度3.17 cm,平均蓄积量为27.67 t hm-2；元阳梯田枯落物平均厚度2.33 cm,平均蓄积量为6.86 t hm-2；前者比后者的枯落物平均厚度大1.4倍,平均蓄积量大4倍。(2)祁连山枯落物平均最大持水量为79.01 t hm-2,平均最大持水率为294.05%；元阳梯田水源林枯落物平均最大持水量为4.76 t hm-2,平均持水率为173.46%；前者比后者的枯落物平均最大持水量大16.61倍,平均持水率大1.7倍。