作 者：
高迪;郭建斌;王彦辉;王晓;马菁;洪流;高艳斌
单 位：
山西农业大学林学院;中国林业科学研究院森林生态环境与保护研究所;北京林业大学水土保持学院
关键词：
六盘山;华北落叶松;林龄;枯落物;水文功能
摘 要：
[目的]探究林龄对华北落叶松林枯落物水文效应的影响。[方法]于2017年6月在宁夏六盘山香水河小流域选择4种林龄阶段(16、25、34、43a)的华北落叶松人工林样地,调查林分结构和测量林下枯落物蓄积量、厚度、持水量等指标,分析不同林龄华北落叶松枯落物层持水能力差异。[结果]研究表明:(1)华北落叶松枯落物厚度介于4.5～6.0 cm,总蓄积量在29.08～33.21 t·hm~(-2),且半分解层蓄积量高于未分解层蓄积量,4种林龄枯落物厚度与蓄积量均表现为成熟林>近熟林>中龄林>幼龄林。(2)各龄林枯落物最大持水量介于79.47～110.05 t·hm~(-2),成熟林最大;最大持水率变动在273.32%～341.27%,中龄林最大。(3)各龄林枯落物持水量、吸水速率与浸水时间动态变化均类似,枯落物持水过程表现为浸水0.5 h内吸水速率最大,4 h之后吸水速率趋于平缓,10 h后枯落物持水量基本饱和,持水量与浸水时间均呈明显对数关系(R~2>0.92)。(4)各龄林枯落物有效拦蓄量在43.64～70.52 t·hm~(-2)之间,成熟林拦蓄能力最强。[结论]综合分析4种林龄枯落物水文效应,成熟林枯落物层水文功能最强。
译 名：
Hydrological Effects of Forest Litters of Larix principis-rupprechtii Plantations with Varying Ages in Liupanshan of Ningxia, China
作 者：
GAO Di;GUO Jian-bin;WANG Yan-hui;WANG Xiao;MA Jing;HONG Liu;GAO Yan-bin;School of Soil and Water Conservation, Beijing Forestry University;Research Institute of Forest Ecology, Environment and Protection, Chinese Academy of Forestry;College of Forestry, Shanxi Agricultural University;
关键词：
Liupanshan;;Larix principis-rupprechtii;;forest age;;forest litter;;hydrological function
摘 要：
[Objective] To study the impacts of forest age on hydrological functions of humus. [Method] Four Larix principis-rupprechtii plantations(mature, near mature, middle age and young) at Xiangshuihe Watershed in Liupanshan were selected in June 2017. The hydrological functions of litter of these L. principis-rupprechtii plantations were surveyed by investigating the stand structure and measuring the amount, thickness and water holding capacity of litter accumulation. [Result](1) The thickness of litter ranged from 4.5 to 6.0 cm, the total accumulation was 29.08～33.21 t·hm~(-2), and the storage of semi-decomposed layer were higher than that of the undecomposed layer. The thickness and accumulation of litter in these plantations were found in the order of mature forest > near mature forest > middle age forest > young forest.(2) The litter of mature forest had the maximum water holding capacity which was between 79.47 and 110.05 t·hm~(-2). The middle aged forest had the highest change rate of water holding capacity, which varied from 273.32% to 341.27%.(3) Dynamic relationship between water holding capacity and soaking time of litter of all these plantations was similar. The water absorption rate of the litter was the highest within 0.5 hour, and the variation of water absorption rate tended to be gentle after 4 hours. The water content of the litter was basically saturated after 10 hours, the relationship between water holding capacity and soaking time followed a significant logarithmic relationship(R~2>0.92).(4) The valid water-interception capacity of litter was between 43.64 and 70.52 t·hm~(-2), the mature forest had the strongest intercepting capacity. [Conclusion] The hydrological function of litter reaches their maximums in mature forest. The results of this study can be used as a reference for the research on hydrological process of the litter layer of L. principis-rupprechtii plantation.
