宁夏六盘山不同林龄华北落叶松人工林枯落物水文效应
Hydrological effects of Forest Litters of Larix principis-rupprechtii plantations with varying age in Liupan Mountains of Ningxia, China
投稿时间:2018-09-17  修订日期:2018-11-29
DOI:
中文关键词:  六盘山  华北落叶松  林龄  枯落物  水文功能
英文关键词:Liupan Mountain  Larix principis-rupprechtii  forest age  forest litter  hydrological functions
基金项目:宁夏回族自治区农业科技自主创新专项全产业链创新示范项目(QCYL-2018-12)、国家重点研发计划项目(2016YFC0501603、2017YFC0504602)、国家自然科学基金项目(41671025、41230852)、国家林业草原局宁夏六盘山森林生态站资助。
作者单位E-mail
高迪 北京林业大学 jstcgaudi@hotmail.com 
郭建斌 北京林业大学 jianbinguo@bjfu.edu.cn 
王彦辉 中国林业科学研究院森林生态环境与保护研究所  
王晓 中国林业科学研究院森林生态环境与保护研究所  
马菁 北京林业大学  
洪流 北京林业大学  
高艳斌 山西农业大学  
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中文摘要:
      摘要:[目的] 为探究林龄对枯落物水文效应的影响。[方法] 本研究于2017年6月在宁夏六盘山香水河小流域选择4种林龄阶段(16a、25a、34a、43a)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。[结果] 研究表明:(1)华北落叶松枯落物厚度介于4.5-6cm,总蓄积量在29.08-33.21 t/hm2,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/hm2,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0.5h内吸水速率最大,4h之后吸水速率趋于平缓,10h后枯落物持水量之后基本饱和,持水量与浸水时间均呈明显对数关系(R2>0.92),吸水速率与浸水时间呈明显幂函数关系(R2>0.99);(4)各龄林枯落物有效拦蓄量在43.64-70.52 t/hm2之间,且成熟林拦蓄能力最强。[结论] 成熟林枯落物层水文功能最强。本研究将有助于加深和完善六盘山地区华北落叶林枯落物层水文过程的研究,为该区域“林水关系”协调的多功能森林管理发展提供理论依据。
英文摘要:
      Abstract: [Objective] In order to explore the impacts of forest age on hydrological functions of humus. [Method] This study selected four different ages of Larix principis-rupprechtii plantation in the small watershed of Xiangshuihe in Liupan Mountain in June 2017. The hydrological functions of litter of Larix principis-rupprechtii plantations under different forest ages were surveyed by investigating the stand structure and measuring the amount of litter accumulation, thickness and water holding capacity. [Result] (1)Litter thickness ranged from 4.5 to 6 cm, and total accumulation was 29.08-33.21 t/hm2, and the storage of semi-decomposed layer were higher than the undecomposed layer, the thickness and accumulation of litter in four forest ages were followed: mature forest > near mature forest > middle age forest > young forest; (2)The maximum water holding capacity of litter was between 79.47 and 110.05 t/hm2, and mature forest had the maximum water holding capacity. The maximum water holding rate varied from 273.32 to 341.27%, and the middle age forest had the maximum water holding rate;(3) Dynamic relationship between water holding capacity and soaking time of litter under different forest ages was similar with water absorption rate. The water absorption rate of the litter in different forest ages was the highest during 0.5 h, and the variation of water absorption rate tended to be gentle after 4 h. The water content of the litter was basically saturated after 10h, the relationship between water holding capacity and soaking time showed a significant logarithmic relationship (R2>0.92), and the water absorption rate showed a significant power function relationship with soaking time (R2>0.99).(4) The modified water-interception capacity of litter in each forest age was between 43.64 and 70.52 t/hm2, and the mature forest had the strongest intercepting capacity. [Conclusion] In a word, the hydrological function of litter reaches their maximums at mature forest. This study supplement the research on hydrological process of the litter layer of Larix principis-rupprechtii plantation, and provide a theoretical basis for the coordinated development between forest and water in Liupan Mountain.
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