不同密度华北落叶松叶凋落物年际分解动态研究

林业资源管理 ›› 2013›› Issue (1): 38-44.

不同密度华北落叶松叶凋落物年际分解动态研究

江萍^1,2, 刘勇¹

1.北京林业大学省部共建森林培育与保护教育部重点实验室,北京 100083;
2.石河子大学林学系,新疆石河子 832000

收稿日期:2012-09-13 修回日期:2012-11-14 出版日期:2013-02-28 发布日期:2020-11-17
通讯作者: 刘勇(1961-),男,云南威信人,教授,博士生导师,主要从事森林培育研究。Email:lyong@bjfu.edu.cn
作者简介:江萍(1978-),女,山西临猗人,讲师,博士,主要从事森林培育研究。Email:bjfujp@sohu.com
基金资助:
高等学校博士学科点专项科研基金(20090014110011);国家自然基金(30972353);北京市教育委员会学科建设与研究生教育建设项目“北京市生态公益林质量升级关键技术研究”;产学研联合培养研究生基地项目(CXYBL2008-2010)

nter-annual Dynamics of Leaf Litter Decomposition in Control-density Larix principis-rupprechtii Plantations

JIANG Ping^1,2, LIU Yong¹

1. Key Laboratory for Silviculture and Conservation,Ministry of Education,Beijing Forestry University,Beijing 100083,China;
2. Forestry Department,Shihezi University,Shihezi 832000,Xinjiang,China

Received:2012-09-13 Revised:2012-11-14 Online:2013-02-28 Published:2020-11-17

摘要/Abstract

摘要： 不同林分密度下叶凋落物基质物质、养分动态及分解速率研究对人工林密度管理具有重要的实践意义。2009—2011年应用分解网袋法对不同林分密度等级下叶凋落物3年间的分解速率、养分动态及化学成分的变化进行测定分析,结果表明:1)凋落物叶失重率年际变化为倒“V”型变化;高密度林分Ⅰ失重率在第3年与其它林分密度存在极显著差异,说明密度对凋落物分解的影响有时间效应。2)分解速率所体现出的林分密度调控效应与失重率及木质素与氮的比值在试验的3年内均保持负相关的变化规律,故木质素/氮、失重率可作为凋落物分解速率的预测指标;可用灰分含量作为周转时间的指示指标。3)N,K的养分动态为释放—固定循环模式;P为平衡波动—固定模式,Mg为持续固定模式,Ca表现出单一的释放—固定变化模式。

关键词: 年际动态, 凋落物基质质量, 抚育间伐, 分解模型

Abstract: It is of vital importance to study the density effects on leaf litter substrate quality and their roles on decomposition rate in managed Larix principis-rupprechtii plantations.In 2000,the thinning experiment was done in four different densities.Decomposition rate,nutrient dynamics and chemical components of leaf litter were explored by litter bag method during 2009 to 2011.The results showed that:(1)Mass loss rate of inter-annual dynamics were shaped like inversed “V”.Highest-density standⅠ,induced by regulated thinning,showed obviously significance between other three-densities’ stands(Ⅱ,Ⅲ and Ⅳ ).It indicates that density has specific temporal effect on litter decomposition.(2)The density effect reflected by decomposition rates was consistent with ratio of lignin content to nitrogen and mass loss rate;therefore the ratio and mass loss rate could be used as predictors of leaf litter decomposition.Additionally,ash mass could be considered as a predictor of turnover period.(3)In the whole observation of 3 years,return pattern of N and K exhibited two-recycled accumulation-release mode ;P followed balanced fluctuation- accumulation mode;Mg indicated the continuous increased mode.However,return pattern of Ca was one-recycled release-accumulation mode.The paper was aimed at offering a theoretical basis for forest thinning management.

Key words: inter-annual dynamics, litter substrate quality, pre-commercial thinning, litter decomposition model

中图分类号:

S791.22

江萍, 刘勇. 不同密度华北落叶松叶凋落物年际分解动态研究[J]. 林业资源管理, 2013,(1): 38-44.

JIANG Ping, LIU Yong. nter-annual Dynamics of Leaf Litter Decomposition in Control-density Larix principis-rupprechtii Plantations[J]. FOREST RESOURCES WANAGEMENT, 2013,(1): 38-44.

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