| 岩溶区不同植被下土壤水溶解无机碳含量及其稳定碳同位素组成特征 |
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| 引用本文： | 梁轩,汪智军,袁道先,杨平恒,贺秋芳.岩溶区不同植被下土壤水溶解无机碳含量及其稳定碳同位素组成特征[J].生态学报,2013,33(10):3031-3038. |
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| 作者姓名： | 梁轩 汪智军 袁道先 杨平恒 贺秋芳 |
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| 作者单位： | 1. 西南大学地理科学学院/三峡库区生态环境教育部重点实验室,重庆,400715
2. 西南大学地理科学学院/三峡库区生态环境教育部重点实验室,重庆400715;中国地质科学院岩溶地质研究所/国土资源部岩溶动力学重点实验室,桂林541004 |
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| 基金项目： | 国家自然科学基金项目，重庆市科委项目，重庆市国土房管局科技项目，西南大学博士基金，岩溶动力学重点实验室开放基金资助项目 |
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| 摘 要： | 自2010年7月至2011年7月对重庆青木关岩溶区典型植被下的土壤水进行了月动态取样,分析了土壤水溶解无机碳含量(DIC浓度)及其稳定碳同位素组成(δ13CDIC值)的时空变化特征,以揭示岩溶土壤系统碳酸盐岩溶蚀作用及其碳汇效应。研究结果表明:草地和针叶林地土壤水的DIC浓度和δ13CDIC值相对较低,分别为59.12 mg/L和-17.22‰,31.47 mg/L和-16.37‰;而旱地、灌丛地、退耕还林地土壤水具有较高的DIC浓度和δ13CDIC值,分别达153.88 mg/L和-12.2‰,221.82 mg/L和-11.9‰,97.30 mg/L和-11.23‰,其中灌丛和退耕还林地的δ13CDIC值与DIC浓度呈正比,且雨季较旱季偏高约4‰—5‰。根据δ13CDIC值,结合各植被类型下土壤水DIC浓度与其相应的土壤碳酸盐含量呈正相关,判断旱地、灌丛地、退耕还林地等岩溶土壤水中的DIC主要来自土壤中碳酸盐岩矿物的碳酸溶蚀,即岩溶土壤中存在着碳酸盐岩碳酸溶蚀作用,从而在一定程度上减少了土壤系统向大气排放的CO2量。
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| 关 键 词： | 青木关岩溶区 土壤水 溶解无机碳(DIC) 稳定碳同位素组成 |
| 收稿时间： | 3/2/2012 12:00:00 AM |
| 修稿时间： | 2012/8/29 0:00:00 |
Characteristics of concentrations and carbon isotope compositions of dissolved inorganic carbon in soil water under varying vegetations in karst watershed |
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| LIANG Xuan,WANG Zhijun,YUAN Daoxian,YANG Pingheng and HE Qiufang.Characteristics of concentrations and carbon isotope compositions of dissolved inorganic carbon in soil water under varying vegetations in karst watershed[J].Acta Ecologica Sinica,2013,33(10):3031-3038. |
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| Authors: | LIANG Xuan WANG Zhijun YUAN Daoxian YANG Pingheng and HE Qiufang |
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| Institution: | Key Laboratory of the Three Gorges Reservoir Region's Eco-Environment (MOE), School of Geographical Sciences, Southwest University, Chongqing 400715, China;Key Laboratory of the Three Gorges Reservoir Region's Eco-Environment (MOE), School of Geographical Sciences, Southwest University, Chongqing 400715, China;Key Laboratory of the Three Gorges Reservoir Region's Eco-Environment (MOE), School of Geographical Sciences, Southwest University, Chongqing 400715, China;The Karst Dynamics Laboratory (MLR), Institute of Karst Geology, Chinese Academy of Geological Sciences, Guilin 541004, China;Key Laboratory of the Three Gorges Reservoir Region's Eco-Environment (MOE), School of Geographical Sciences, Southwest University, Chongqing 400715, China;Key Laboratory of the Three Gorges Reservoir Region's Eco-Environment (MOE), School of Geographical Sciences, Southwest University, Chongqing 400715, China |
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| Abstract: | |
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| Keywords: | Qingmuguan karst area soil water dissolved inorganic carbon stable carbon isotope compositions |
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