生态学报2017，Vol.37Issue(9)：3096-3105,10.DOI:10.5846/stxb201601290213
高寒森林不同生境对凋落叶分解灰分动态的影响
Effects of environmental conditions on ash dynamics during foliar litter decomposition in an alpine forest
摘要
Abstract
Ash is an important component of fotiar litter,the concentration of which is closely related to the process of litter decomposition and the concomitant organic matter dynamics.Ash dynamics in decomposing litter may be affected by environmental conditions and decomposition period.However,currently there is little information about the dynamics of ash concentration in decomposing litter.To fill this knowledge gap,we investigated the dynamics of ash mass and concentration in decomposing foliar litter (litterbag method) of four dominant species (Salix paraplesia,Rhododendron lapponicum,Sabina saltuaria,and Larix mastersiana) under different environmental conditions (forest floor,stream,and riparian zone) in an alpine forest in the upper reaches of the Minjiang River.The results indicated that ash mass in decomposing foliar litter generally decreased over the 2-year experiment,regardless of litter species and environmental conditions,but that there was variation in the magnitude of the decrease.In contrast,ash concentration in all litter species showed a general increasing trend (5.86％-72.15％),except for S.paraplesia foliar litter in streams,which decreased approximately 0.99％ over the two years.Changes in ash concentration varied significantly among different decomposition periods,and were significantly affected by initial litter quality and environmental factors.Overall,our results are inconsistent with the historical opinion that ash concentration is relatively stable during litter decomposition,which suggests that the method for calculating ash-free mass loss,using the initial ash concentration value based on the assumption that ash concentration is relatively stable during litter decomposition,is incorrect.The results of this study can provide the basis for a better understanding of ash dynamics during litter decomposition,and the correct method for calculating litter mass loss.关键词
凋落叶分解/溪流/林下/河岸带/灰分浓度/环境特征Key words
foliar litter decomposition/stream/forest floor/riparian zone/ash concentration/environmental factor引用本文复制引用
岳楷,杨万勤,张川,彭艳,黄春萍,吴福忠..高寒森林不同生境对凋落叶分解灰分动态的影响[J].生态学报,2017,37(9):3096-3105,10.基金项目
国家自然科学基金(31270498,31570445,31500358) （31270498,31570445,31500358）
高等学校博士学科点专项科研基金(20135103110002) （20135103110002）
