南方农业学报2013，Vol.44Issue(6)：968-973,6.DOI:10.3969/j:issn.2095-1191.2013.6.968
桂林岩溶土壤和植被的稳定碳同位素组成及季节性变化特征
Stable carbon isotopic composition and seasonal varying characteristics of karst soil and vegetation in Guilin
摘要
Abstract
[Objective]Using the karst soil in Guilin as the example,δ13C value of organic carbon in karst soil and vegetation was monitored for a long time to study the stable carbon isotopic composition and seasonal varying characteristics so as to provide scientific references for carbon cycle pathway in karst regions of South China.[Method]Dominant plants including Vitex negundo and Loropetalum chinense and soil were sampled regularly to detect organic carbon content and δ13C value.[Result] The δ13C value of soil organic carbon obviously changed in different seasons with the range of-2750‰ to-17.92‰.The average δ13C value range in each organ of Vitex negundo and Loropetalum chinense was 28.23‰ to-25.15‰.The δ13C value of soil organic carbon ranged from-22.32‰ to-19.00‰.The sequence of soil organic carbon content was karst depression bushes＞karst slop bushes＞karst depression irrigation grass,and surface soil(0-5 cm)＞ deeper soil(10-20 cm).[Conclusion]The amplitude change of soil organic carbon δ13C was larger,but the change rule of slope,depression and grassland was inconsistent.From surface to the downward,the soil δ13C value decreased with the increase of soil depth on the whole,indicating that the δ13C value of soil organic carbon was obviously higher than that of local plants.关键词
δ13C/有机碳/碳循环/岩溶土壤/桂林Key words
δ13C/organic carbon/carbon cycle/karst soil/Guilin分类
天文与地球科学引用本文复制引用
李涛,吴夏,黄艳梅,陈家瑞,张美良,朱晓燕..桂林岩溶土壤和植被的稳定碳同位素组成及季节性变化特征[J].南方农业学报,2013,44(6):968-973,6.基金项目
国家自然科学基金项目(40772216) （40772216）
广西青年科学基金项目(桂科青0640076) （桂科青0640076）
中国地质科学院岩溶地质研究所基金项目(2012006) （2012006）
