华北落叶松人工林凋落物储量及其持水特性  

Reserve and Water-holding Characteristics of Litters in Larix principis-rupprechtii Plantation

作　　者：张愿[1] 马长明[1] 

机构地区：[1]河北农业大学林学院,河北保定071000

出　　处：《林业资源管理》2014年第6期63-68,共6页Forest Resources Management

基　　金：国家"十二五"科技支撑计划项目"华北土石山区森林可持续经营技术研究与示范"(2012BAD22B0304);河北农业大学林学院校基金"基于天然更新的油松华北落叶松人工混交林抚育采伐技术研究"(qj201207)

摘　　要：以燕山山地主要的造林树种华北落叶松(Larix principis-rupprechtii)(16a,23a,34a,42a)和主要混交树种26a白桦(Betula platyphylla)、30a山杨(Populus davidiana)凋落物为研究对象,从不同林龄、不同组成成分、组成比例方面对凋落物的储量和持水特征展开研究。结果表明:1)华北落叶松人工林(16a,23a,34a,42a)以及26a白桦次生林、30a山杨次生林这6种林分类型的凋落物储量分别为35.75,45.50,60.00,65.94,25.40,19.39t/hm2。2)不同林龄落叶松凋落物的持水率呈现出16a>23a>34a>42a的趋势,白桦和34a华北落叶松,山杨和34a华北落叶松分别以不同比例混合的凋落物的持水率以落叶松+白桦(1∶3)的最大,凋落物持水率随着浸泡时间的增加呈指数式增加;3)不同林龄华北落叶松凋落物的吸水速率呈现16a>23a>34a>42a。6种不同比例混合凋落物的吸水速率以落叶松+白桦(1∶3)的最大。凋落物吸水速率与浸水时间之间存在幂函数关系,随浸泡时间的增加,吸水速率减小。To understand the reserves and Water-holding caracteristics of litter in Larix principis-rupprechtii,Betula platyphylla and Populus davidiana,we implemented our experiment among different Forest ages,different components and different proportion of litters in Larix principis-rupprechtii in Yanshan mountain. The results shows that（i） the reserves of 6 forest stands are 35. 75,45. 50,60. 00,65. 94,25. 40,19. 39 t / hm2 separately.（ii） in each period,the water-holding rate of litter of different ages in Larix principis-rupprechtii plantations all present a same trend as 16 a〉 23 a 〉34 a〉 42a; when we studied the different mixed modes of litter,the water-holding rate of litter of Larix principis-rupprechtii ＋ Betula platyphylla（1：3） is the biggest. Water-holding rate increased in a way of logarithm when soak time was extended.（iii）water absorption rate reduces in turn among 16 a,23a,34 a and 42 a. When we studied the different mixed modes of litter,the water absorption rate of litter of Larix principis-rupprechtii ＋ Betula platyphylla（1： 3） is the biggest. Water absorption rate decreases in a way of power function when soak time was extended.

关 键 词：华北落叶松 凋落物 储量 持水率 吸水速率 

分 类 号：S718.55[农业科学—林学]