生态学报2017，Vol.37Issue(16)：5285-5293,9.DOI:10.5846/stxb201605190967
长白山垂直带森林叶片-凋落物-土壤连续体有机碳动态——基于稳定性碳同位素分析
Organic carbon dynamics of the leaf-litter-soil continuum in the typical forests of the Changbai Mountain transect: an analysis of stable carbon isotope technology
摘要
Abstract
The natural abundance of the stable carbon isotope (δ13C) records key information regarding the ecosystem carbon (C) cycle and is commonly used to assess the C dynamics in terrestrial ecosystems under global change.In this study,we selected four typical forest ecosystems along the vertical transect distributed in Changbai Mountain and measured the C concentrations and δ13C values of leaves of constructive tree species,litter,and soils at different soil layers.The aim of this study was to explore the patterns of C content and δ13C values in the leaf-litter-soil continuum,as well as their ecological indications.The results showed that foliar C content first increased and then decreased with the increasing altitude,and the parabolic peak appeared at the Ermans birch-spruce-fir forest stand;moreover,the C content of broadleaved tree species was significantly lower than that of coniferous species,reflecting that coniferous species had a higher C sequestration capacity relative to that of broadleaved species.Climatic factors and vegetation types dominated the pattern of foliar C content.In addition,foliar δ13C decreased with increasing altitude,indicating that vegetation at high altitude sites had lower water use efficiency (WUE) and higher water consumption by C sequestration relative to that at low altitude sites.Litter C content gradually decreased with increase in altitude,whereas topsoil C content at the 0-20 cm depth at the broad-leaved Korean pine forest (BLKP) and Ermans birch forest (EB) was higher than that of the Korean pine-spruce-fir forest (KPSF) and Ermans birch-spruce-fir forest (EBSF),reflecting the predominance of vegetation type and soil texture together.Overall,the birch forest had the highest SOC turnover rate,followed by that of the two dark coniferous forests,and that of the broad-leaved Korean pine forest was the lowest.Our results suggest that climatic factors are not the predominant factors in the belowground C cycle of temperate forests at a small scale,and vegetation functional types and soil properties could have greater effects on the turnover and stability of SOC.Because the factors driving the turnover of SOC are not the same at different study scales,we should more intensively consider the research scale when we explore the effects of environmental factors on C cycle and C budget in terrestrial ecosystems.The SOM turnover model,based on the regression of logSOC and δ13C,is a good method to characterize the rate of SOM turnover in various ecosystems,which can be used to evaluate the response of SOC dynamics to global change.关键词
13C自然丰度/叶片-凋落物-土壤连续体/水分利用效率/土壤碳周转/山地垂直带Key words
13C natural abundance/leaf-litter-soil continuum/water use efficiency/soil C turnover/mountain transect引用本文复制引用
司高月,李晓玉,程淑兰,方华军,于贵瑞,耿静,何舜,于光夏..长白山垂直带森林叶片-凋落物-土壤连续体有机碳动态——基于稳定性碳同位素分析[J].生态学报,2017,37(16):5285-5293,9.基金项目
国家自然科学基金资助项目(41471212,31470558,31290222,31290221) （41471212,31470558,31290222,31290221）
国家重点研发计划资助项目(2016YFC0500603,2016YFC0503603) （2016YFC0500603,2016YFC0503603）
青年创新研究团队资助项目(LENOM2016Q0004) （LENOM2016Q0004）
