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Root-order-associated variations in fine-root decomposition and their effects on soil in a subtropical evergreen forest

引用

Ecological Processes 2022年第1期11卷 654-668页

作者： Yibo Wu Mengling Zhang Zhibao Cheng Fang Wang Xiaoyong Cui School of Civil and Environment Engineering Ningbo UniversityNingbo 315211China Institute of International Rivers and Eco-Security Yunnan UniversityKunming 650504China College of Life Sciences University of Chinese Academy of SciencesBeijing 100049China Environmental Futures Research Institute School of Environment and ScienceGriffith UniversityBrisbane 4111Australia Beijing Yanshan Earth Critical Zone National Research Station University of Chinese Academy of SciencesBeijing 101408China

Background:Despite the importance of root decomposition in predicting ecosystem responses to future climate change,the effects of branch order on root decomposition and the feedback to soil still remains poorly *** we separated root samples taken from two tree species(Castanopsis fargesii and Schima superba in subtropical forests along the coastal area in eastern China)into four-order classes(1st–2nd order,3rd order,4th order,and 5th order)and conducted a 540-day litterbag incubation experiment in laboratory to examine root mass loss,nutrient release,and the influence on soil during ***:*** roots of 1st–2nd and 3rd order decayed more slowly than those of 4th and 5th order,but this pattern was not significant for *** all the measured root traits,the decomposition rates correlated best with root C/N ratio,diameter and specific root length(SRL)based on the structural equation *** tree species and root order exhibited significantly effects on root initial ***,*** roots decay faster than ***,and this appears to be associated with root initial C quality and N *** addition,root order positively affected root decomposition rates mainly through root diameter and ***,no significant difference was found in C and N content between soils below the litterbag with different-order ***:Our findings suggest the effects of branch order on root decomposition are dependent on tree ***,root morphological properties might also be the controlling factor in root decay besides root chemistry ***,the integrative effects should be considered to improve our understanding of the fate of fine-root litter and their contribution to soil C and N pool.

关键词： Root branch Mass loss Initial quality subtropical evergreen tree Soil carbon

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