中文摘要：

选择天宝岩国家级自然保护区内4种不同长苞铁杉混交林（A－D）粗木质残体（CWD）为研究对象,采用自然风干法与室内浸泡法对不同类型（倒木、枯立木、树桩）和不同腐烂程度（Ⅰ－Ⅴ级,腐烂由轻到重）CWD的蓄水能力进行测定分析和对比研究。结果显示：（1）CWD有效拦蓄量在不同长苞铁杉混交林下表现为：长苞铁杉＋石栎＋马尾松混交林（B,14.21t/hm^2）〉长苞铁杉＋甜槠＋青冈混交林（C,7.78t/hm^2）〉长苞铁杉＋青冈＋深山含笑混交林（D,6.99t/hm^2）〉长苞铁杉＋猴头杜鹃混交林（A,4.74t/hm^2）,而在各CWD类型下表现为：倒木（19.579t/hm^2）〉枯立木（8.494t/hm^2）〉树桩（5.661t/hm^2）。（2）各长苞铁杉混交林CWD的蓄水量和蓄水速率在蓄水过程中都表现为B〉D〉C〉A,而在脱水过程中都表现为B〉C〉A〉D。（3）不同腐烂等级的CWD按其蓄水量、蓄水速率和脱水速率大小排列皆为：Ⅱ级〉Ⅵ级〉Ⅲ级〉Ⅴ级〉Ⅰ级。研究表明：CWD蓄水量的大小差异与群落类型、腐烂等级、CWD本身持水性等因素有关,其蓄水和脱水的速率与其持水量、蓄积量以及腐烂等级之间也存在密切的联系;CWD的自然持水率随腐烂等级增加呈增加趋势,而且腐烂等级越高CWD蓄水速率变化也越明显,CWD腐烂等级对其蓄水能力影响较大;倒木具有较好的持水能力,并在蓄积量上远大于树桩和枯立木,对降雨有较强的实际拦截能力。

英文摘要：

In the Tianbaoyan National Nature Reserve,with coarse woody debris（CWD）in the four kinds of different Tsuga longibracteata mixed forests（A-D）as the research object,by the method of natural wind dry and indoor soak,we carried out CWD quantitative analysis and comparative study for water storage capacity in the process of water and dehydration according to types（fallen woods,snags,stumps）and decay classes（I-V,from slight to severe degrees）.The results showed that：（1）different T.longibracteata mixed forests arranged order by modified interception amount of CWD：T.longibracteata＋Lithocarpus glabra＋Pinus massoniana mixed forests（B,14.21t/hm^2）〉T.longibracteata＋Castanopsis eyrei＋Cyclobalanop-sis glauca mixed forests（C,7.78t/hm^2）〉T.longibracteata＋C.glauca＋Michelia maudiae mixed forests（D,6.99t/hm^2）T.longibracteata＋Rhododendron simiarum mixed forests（A,4.74t/hm^2）;The various types of CWD arranged order by modified interception：Fallen woods（19.579t/hm^2）〉Snags（8.494t/hm^2）〉Stumps（5.661t/hm^2）;（2）In the water-absorption process,arrange the water storage capacity and waterabsorption rate of the CWD with different Tsuga longibracteata mixed forests according to size：B〉D〉C〉A,while in the water-losing process,arrange the water storage capacity and water-losing rate of the CWD with different T.longibracteata mixed forests according to size：BCAD;（3）The CWD of different decay calsses according to water storage capacity,water-absorption rate and water-losing rate for size：Ⅱ〉Ⅵ〉Ⅲ〉Ⅴ〉Ⅰ.The studies showed that：the size difference of CWD storage of water is connected with the community types,decay classes,water holding capacity of CWD and other factors.The rate of water and dehydration is also closely related to its water-holding capacity,water storage capacity and decay classes.The natural water holdup of CWD is compounded by the increasing decay class.And the decay class of CWD is higher,the change of water storage rat