麦积山风景区5种典型林分枯落物水文效应研究  

Hydrological Effects of Litter in Five Typical Stands of Maijishan Scenic Spot

作　　者：何鹏 王具元[1] He Peng;Wang Juyuan(Gansu Forestry Vocational and Technical College,Tianshui 741020,China)

机构地区：[1]甘肃林业职业技术学院

出　　处：《防护林科技》2019年第11期7-10,共4页Protection Forest Science and Technology

基　　金：天水市科技局科技支撑项目

摘　　要：选取麦积山风景区5种典型林分为研究对象,对林下枯落物层水文效应进行研究。结果表明:就蓄积量而言,油松林枯落物最大,为9.65 t·hm-2;白皮松林最小,为5.31 t·hm-2。在所有的蓄积量中,占比最多的是白皮松林未分解层,比例接近50%;油松+锐齿栎林所占比例最小,为35.452%;半分解层油松+锐齿栎林比例最大,为64.48%;锐齿栎最小,为51.85%。未分解层和半分解层最大拦蓄率和有效拦蓄率均表现为锐齿栎最大,白皮松最大拦蓄率和有效拦蓄率最小;油松群落最大拦蓄率和有效拦蓄量最大。将这些枯落物浸泡在水中,刚开始2 h内,它们的持水量都得到了显著上升,2 h后持水量明显下降;浸泡6 h以后,未分解层枯落物的持水量最高;连续将半分解层枯落物在水中一直浸泡12 h后,半分解层枯落物的蓄积水量达到最大值;这些枯落物最初浸泡1 h内,枯落物半分解层的吸水率比其他枯落物的吸水率要高,连续浸泡达到6 h时,这5种林分枯落物吸水率数值图最终几乎完全重合。Taking five typical stands in Maijishan Scenic Spot as the research object to study the hydrological effect of litter layer under the forest.Result shows that the litter of Pinus tabulaeformis forest is the largest,being 9.65 t·hm-2 in total, and that of Pinus bungeana forest is the smallest,being 5.31 t·hm-2. Among all the stocks, the largest is the undifferentiated layer, nearly being 50%. The proportion of Pinus tabulaeformis + Quercus acutissima forest is the smallest, which is 35.452%. The proportion of Pinus tabulaeformis + Quercus acutissima forest in semi decomposed layer is the largest, being 64.48%, and Quercus acutissima forest is the smallest, being 51.85%. Quercus aliena of the maximum and the available interception rates of the nondecomposed and the semidecomposed layer are the largest, the maximum and the available interception rates of the Pinus bungeana are the smallest;and the maximum and the available interceiption rates of Pinus tabulaeformis community are the largest.The retention capacity of Pinus bungeana is the worst. In the first two hours, the water holding capacity of the litter increase significantly, and after two hours, the water holding capacity decrease significantly. After soaking for six hours, the value of the litter in the undifferentiated layer is the highest in terms of the water capacity of the litter. When the litter in the semi decomposed layer is continuously immersed in the water for more than 12 hours, the volume of the litter in the semidecomposed layer reaches the maximum. In the first hour of soaking these litter, the water absorption of litter decomposition layer is higher than that of other litter. When soaking for six hours continuously, the numerical charts of water absorption of these five kinds of litter are almost identical.

关 键 词：麦积山风景区 林内枯落物 水文效应 

分 类 号：S718.5[农业科学—林学]