三峡库区几种林下苔藓的保水功能

通过对三峡库区三种森林类型(松栎混交林、栓皮栎纯林、马尾松纯林)林下苔藓储量调查分析及其持水特性试验，得到不同森林类型林下苔藓储量、最大持水量、吸水速率等水文特征参数。结果表明，马尾松纯林林下苔藓储量最大(12．93t／hm^2)，松栎混交林和栓皮栎纯林林下苔藓储量相同(9．47t／hm^2)。松栎混交林林下苔藓最大持水量为5．36mm，栓皮栎纯林为5．73mm，马尾松纯林为6．26mm。研究结果还表明，三峡库区林下苔藓持水量随时间变化过程与森林类型无关。在只有苔藓覆盖情况下，不同森林类型林内不产生水分下渗和地表径流时的最大降雨量和最大降雨雨强分别为：松栎混交林林地5．36mm，5．820mm／h；马尾松纯林林地6．26mm，7．420mm／h；栓皮栎纯林林地5．73mm，6．060mm／h。

WATER CONSERVING FUNCTION OF MOSS ON FOREST STANDS IN THE THREE GORGES AREA

Through the water holding experiment and the moss amount survey on three kinds of forest stands(the mixed forest of Quercus variabils.B1and pinus massoniana Lamb,the pure Quercus variabils.B1forest and the pure pinus massoniana Lame.forest)in the Three Gorges area,the moss amount and the hydrological characteris - tic parameters,such as the maximum water capacity,water absorption speed,have been studied.The result shows that the moss amount on the pure pinus massoniana Lamb.forest stand is the maximun(12.93t/hm 2 ),the moss amount on the mixed forest stand of Quercus variabils.B1and Pinus massoniana Lamb is the same as that on the Pure Quercus Variabils.B1forest stand(9.47t/hm 2 ).The maximum water capacity of the moss on the mixed forest stand of Quercus variabils.B1and pinus massoniana Lamb is5.36mm,that of the moss on the pure Quercus variabils.B1forest stand is5.73mm,that of the moss on the pure pinus massoniana Lamb.forest stand is6.26mm.The result also shows that the temporal variation of moss' water capacity has no relation with forest type.When there is only moss on the forest stands,the maximum rainfall amount and the maximum rain - fall intensity under which there will be no water infiltration and surface runoff,is respectively5.36mm,5.820mm/h(for the mixed forest),6.26mm,7.420mm/h(pure pinus massoniana Lamb.forest),5.73mm,6.060mm/h(pure Quercus variabils.B1forest).