摘要
在北京九龙山自然保护区内选取有代表性的4种林分类型,测定各林分枯落物的蓄积量,采用室内浸泡法对其水文效应进行研究,旨在为该区森林植被枯落物生态水文功能评价提供一定的参考。结果表明:(1)4种林分枯落物层蓄积量大小依次为:黄栌油松混交林(29.65t/hm2)>黄栌纯林(22.78t/hm2)>黄栌侧柏混交林(16.87t/hm2)>侧柏纯林(12.17t/hm2);(2)同一浸水时间下黄栌油松混交林的枯落物持水量最大,黄栌纯林、黄栌侧柏混交林次之,侧柏纯林最小,枯落物层的持水量与浸泡时间为对数函数关系,持水量历时过程呈现出迅速吸水、缓慢吸水、逐渐饱和、饱和4个阶段;(3)4种林分枯落物层的吸水速率与浸水时间为幂函数关系,其过程可分为迅速下降、缓慢下降、趋于稳定的3个阶段。
Four types of representative forests at the Jiulongshan Nature Reserve were selected to investigate the forest stock volume and water-holding capacity of litter layers, to provide reference for forest litter's eco- hydrological function evaluation in this area. The results showed: (1) the order of the total storage capacity of four stand litters showed mixed forest of Continus coggygria and Pinus tabulaeforrnis (29.65 t/hm2) 〉 Continus coggygria forests(22.78 t/hm2) :〉mixed forest of Continus coggygria and Platycladus orientalis (16.87 t/hm2 ) :〉 artificial Platycladus orientalis forests (12. 17 t/hm2 ) ; (2) under the same soaking time, mixed forest of Continus coggygria and Pinus tabulaeformis r water holdings capacity of litters is the largest, followed by Continus coggygria forests, mixed forest of Continus coggygria and Platycladus orientalis, ar- tificial Platycladus orientalis forests, the relationship between water holding capacity and soaking time is de- scribed by the equation of Q=aln(t)+b, the lasting process of water holding capacity showed four stages as rapid water absorption, slow absorption, gradual saturation, saturated;(3) the relationship between absorp- tion rate and immersion time can be described by the equation of V=kt^n , the process can be divided into rapid decline, slow decline, tends to be stable three stages.
出处
《水土保持研究》
CSCD
北大核心
2013年第5期160-164,169,共6页
Research of Soil and Water Conservation
基金
863计划数字化森林资源监测技术研究(2012AA102001-2)
中国博士后科学基金面上资助(2012M510611)
关键词
水文效应
枯落物
持水率
吸水速率
hydrological effect
forest litters
proportion of water holding capacity
water absorption rate