摘要
为了定量评价福建柏(Fokienia hodginsii)人工林凋落物的水文功能,采用野外实地调查和室内浸水法,对广西六万林场福建柏纯林、福建柏+红锥(Castanopsis hystrix)混交林两种造林模式林下凋落物的储存量、持水特性、拦蓄特性、吸水过程进行了研究。结果表明:福建柏混交林凋落物储存量大于纯林;混交林半分解层凋落物大于未分解层凋落物,而纯林则相反。混交林凋落物自然含水率、自然含水量和最大持水量均大于纯林,而纯林凋落物最大持水率、最大拦蓄量、有效拦蓄量和有效拦蓄深均大于混交林。混交林凋落物半分解层的持水和拦蓄特性均大于未分解层,而纯林除了自然含水量外,其它则相反。福建柏人工林凋落物持水速率随时间延长而增加;凋落物对最初降水的拦蓄能力较强;凋落物持水速率和吸水速率皆呈幂函数关系。因此,福建柏混交造林能更好地发挥其持水功能。
In order to evaluate the hydrological function of litter amount in Fokienia hodginsii plantation,fieldwork investigation and indoor immersion experiment were conducted to study the litter amount,water-holding characteristic,water-retaining characteristic and water-absorption process of F. hodginsii pure plantation and F. hodginsii + Castanopsis hystrix mixed plantation in Liuwan forest farm, Guangxi. The results showed that F. hodginsii mixed forest had more litter amount than that of the pure forest. In the mixed forest,semi-decomposed litter layer was thicker than that of undecomposed layer,pure forest,on the other hand,was the opposite. Litter moisture content,moisture content and maximum water-holding capacity of the mixed forest were higher than those of the pure forest,while maximum water-holding percentage,maximum interception amount,effective interception amount and effective interception depth of the pure forest were higher than those of the mixed forest. In the mixed forest,semi-decomposed layer had higher water-holding capacity and interception amount than those of undecomposed layer;while in the pure forest,undecomposed layer exhibited higher water-holding capacity and interception amount than those of semi-decomposed layer except for natural moisture content. Water-holding rate of the litter increased with the extension of time,and the litter had stronger interception capacity for initial precipitation. Both water-holding rate and water-absorption rate presented power function relationship. Therefore,afforestation of F. hodginsii mixed with C. hystrix could exert its hydrological function better.
出处
《广西林业科学》
2017年第3期271-275,共5页
Guangxi Forestry Science
基金
广西林科院基本科研业务费专项(林科201620号)
关键词
福建柏
凋落物
持水特性
拦蓄特性
Fokienia hodginsii
litter
water-holding characteristic
interception characteristic
