冀北地区不同林分枯落物层的持水能力分析

Analysis of Water Holding Capacity of Litter Layer in Different Stands in Northern Hebei Province

采用样地调查和室内浸泡法,对河北省木兰围场国有林场孟滦分场3种不同林分枯落物的持水能力进行了研究。结果表明:枯落物的蓄积量为针阔混交林>油松林>蒙古栎林;枯落物的吸水速率在未分解层和半分解层中均表现为针阔混交林>蒙古栎林>油松林。在未分解层中最大持水量为蒙古栎林(2931.7)>针阔混交林(2477.6)>油松林(1504.8);而在半分解层中最大持水量为针阔混交林(2801.2)>蒙古栎林(2718.3)>油松林(1128.4)。枯落物的有效拦蓄量未分解层和半分解层均表现为油松林>蒙古栎林>针阔混交林。蒙古栎林的持水能力优于其他2种林分类型。

With the method of sample plot investigation and indoor immersion,the water holding capacity of litter in three different stands of Mengluan Branch of Hebei Mulan Paddock State-owned Forest Farm in was studied.The results showed as follows:the order of litter volume from large to small was coniferous and broad-leaved mixed forest,Pinus tabuliformis,Castanea mollisssima;the water absorption rate of litter in the undecomposed layer and semi-decomposed layer was coniferous and broad-leaved mixed forest>Castanea mollisssima>Pinus tabuliformis.The maximum water holding capacity in the undecomposed layer was Castanea mollisssima(2931.7)>coniferous and broad-leaved mixed forest(2477.6)>Pinus tabuliformis(1504.8),while in the semi-decomposition layer,the maximum water holding capacity from high to low was coniferous and broad-leaved mixed forest(2801.2)>Castanea mollisssima(2718.3)>Pinus tabuliformis(1128.4).The effective retention amount of litter in the undecomposed layer and the semi-decomposed layer showed Pinus tabulaeformis>Castanea mollisssima>mixed coniferous and broad-leaved forest.The water holding capacity of Castanea mollisssima was better than that of the other two stands types.