摘要
通过对三峡库区3种森林类型(松栎混交林、栓皮栎纯林、马尾松纯林)林下枯落物储量调查分析及其持水特性试验,得到不同森林类型林下枯落物储量、最大持水量、吸水速率等水文特征参数。结果表明,栓皮栎纯林林下枯落物储量最大(10.7t/hm2),其后依次为松栎混交林(10.1t/hm2)、马尾松纯林(5.8t/hm2)。松栎混交林林下枯落物未分解层最大持水量为其风干重的310.4%,栓皮栎纯林为286.5%,马尾松纯林为221.1%。松栎混交林林下枯落物半分解层最大持水量为其风干重的252.7%,栓皮栎纯林为249.2%,马尾松纯林为201.5%。经分析拟合,得到林下枯落物未分解层和半分解层吸水速率与浸泡时间之间关系式为S=ktn。研究结果还表明,在同为中龄林条件下,三峡库区针阔混交林林下枯落物持水能力大于阔叶树纯林或针叶树纯林林下枯落物持水能力。
Through the litter amount survey and the water holding characteristic experiment of the litter under three kinds of forest (mixed forest of Quercus variabils B1 and Pinus massoniana Lamb., Quercus variabils B1 forest and Pinus massoniana Lamb. forest), the litter amount and the characteristic parameters, such as the maximum water holding capacity, water absorption speed, have been gotten. The result shows that the litter amount under Quercus variabils B1 forest is the maximum(10.7 t/hm2), the second is mixed forest(10.1 t/hm2), the third is Pinus massoniana Lamb. forest(5.8 t/hm2). The maximum water holding capacity of the undecomposed litter under mixed forest is 310.4% of its dry weight, that of the litter under Quercus variabils B1 forest is 286.5%, that of the litter under Pinus massoniana Lamb. forest is 221.1%. The maximum water holding capacity of the halfdecomposed litter under Mixed forest is 252.7% of its dry weigh, that of the litter under Quercus variabils.B1 forest is 249.2%, that of the litter under Pinus massoniana Lamb. forest is 201.5%. By analyzing, the equation between the water absorption speed of the litter and the immerse time is S=ktn. The result also shows that when they are in midage, the water holding ability of the litter under the mixed forest of broadleaf and conifer is higher than that of the litter under the pure broadleaf or under the pure conifer.
出处
《水土保持学报》
CSCD
北大核心
2003年第3期55-58,123,共5页
Journal of Soil and Water Conservation
基金
国家自然科学基金项目"长江三峡库区优先流对地表径流过程的影响"(40171014)的部分研究内容
