冀北山地油松林枯落物的持水特性研究

Water holding capacity of litters of Pinustabulaeformis forests in the northern mountains of Hebei Province

为了阐明冀北山地油松林枯落物的持水规律,对其枯落物蓄积量、持水量、吸水速率和有效拦蓄量进行了研究。结果表明:油松林枯落物的未分解层和半分解层蓄积量分别为2.95t/hm2和11.58t/hm2。油松林枯落物半分解层和未分解层持水量在浸泡6h和4h时基本达到饱和;吸水速率随着时间的延长逐渐下降。油松未分解层和半分解层枯落物最大持水量分别为2.28t/hm2、14.23t/hm2,而有效拦蓄量分别为1.69t/hm2和10.77t/hm2。

In order to clarify the water holding capacity of litters of Pinus tabulaeformis forest in the northern mountains of Hebei Province ,the litter stock ,water holding capacity , water absorption rate and modified interception amount at Mulanweichang were studied .The result showed that ：the litter amount of Pinus tabulae f ormis forest at undecomposed layer and semi decomposed layer was 2 .95 t/hm2 and 11 .58 t/hm2 . Water absorption rate decreased gradually with the immersion time increasing .when immersed for 4 h and 6 h , respectively ,both undecomposed litter ,and semidecomposed litter were saturated ,with the maximum water holding capacity and effective interception amount of 2 .28 t/hm2 and 14 .23 t/hm2 ,and 1 .69 t/hm2 and 10 .77 t/hm2 respectively .