干旱区生态环境知识资源中心(Arid): 土地利用变化对岩溶地下水溶解无机碳及其稳定同位素组成的影响

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	土地利用变化对岩溶地下水溶解无机碳及其稳定同位素组成的影响
其他题名	Influence of land use change on dissolved inorganic carbon and stable isotopic compositions of karst groundwater
	赵敏 1; 曾成 2; 刘再华 1
ISSN	0379-1726
出版年	2009
卷号	38 期号:6 页码:565-572
中文摘要	土地利用变化对岩溶地下水溶解无机碳(DIC)的影响关系到岩溶作用强弱及其相关的全球碳循环的正确评价.对贵州茂兰原始森林内的板寨岩溶地下河流域和普定岩溶石漠化强烈的陈旗、灯盏河泉域三种不同的土地利用下的地下水的DIC及其稳定同位素进行了分析,结果表明,地下水的DIC表现形式主要为HCO_3~-.对于缺少土壤覆盖的板寨和灯盏河岩溶地区.雨季主要因为稀释作用,HCO_3~-含量出现年内最低值;而对于较多土壤覆盖的陈旗岩溶地区,雨季主要受土壤CO_2效应控制,HCO_3~-含量出现年内最高值,反映了土壤在岩溶作用及其碳循环中的特殊重要性.此外,夏季由于生物量的增加,delta(13)C_(DIC)值较冬季偏轻1～2.而对于不同土地利用而言,石漠化影响下的地下水delta~(13)C_(DIC)较原始森林下的地下水偏重2.5～3.0,且随着石漠化的发展,土壤的进一步流失,地下水delta~(13)C_(DIC)进一步偏重,反映了石漠化后生物量比例减少和大气成因CO_2比例增加对地下水delta~(13)C_(DIC)升高的影响.
英文摘要	Influences of land use change on the dissolved inorganic carbon (DIC) of karst groundwater has implications for estimating the intensity of karstification and the karst-related global carbon cycle. In this paper,DIC and stable carbon isotopic compositions of ground waters under three different land use conditions, which are Banzhai karst groundwater in the virgin forest of Maolan, Chenqi and Dengzhanhe spring waters in Puding County,where karst rocky desertification developed severely, were analyzed. The results show that the DIC of groundwater was mainly in the form of HCO_3~-. Because of the dilution effect, the HCO_3~- concentration was lower in rainy season for the Banzhai and Dengzhanhe karst areas with little soil cover. However, because of the stronger soil CO_2 effect compared to dilution effect, the HCO_3~- concentration was higher in rainy season for the Chenqi karst area with greater soil cover. This difference shows that soil cover plays a very important role in the karstification. In addition,the values of delta~(13)C_(DIC)in summer were 1 - 2 lower than those in winter due to larger biomass effect in summer.With respect to the effect of different land use, the delta~(13)C_(DIC) values of groundwater under areas with karst rocky desertification were 2. 5- 3.0 higher than those under virgin forest. With the development of karst rocky desertification, soil losses became more serious, and the delta~(13)C_(DIC) values of groundwater were getting higher. This reflects the combined effect of biomass reduction and more atmospheric CO_2 input under karst rocky desertification,both of which increased the delta~(13)C_(DIC) values of groundwater.
中文关键词	溶解无机碳 ; 稳定碳同位素 ; 生物量效应 ; 稀释效应 ; 土地利用 ; 岩溶石漠化 ; 森林
英文关键词	dissolved inorganic carbon stable carbon isotope biomass effect dilution effect land use karst rocky desertification forest
语种	中文
国家	中国
收录类别	CSCD
WOS类目	GEOLOGY
WOS研究方向	Geology
CSCD记录号	CSCD:3751047
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/223392
作者单位	1.中国科学院,地球化学研究所, 环境地球化学国家重点实验室, 贵阳, 贵州 550002, 中国; 2.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, 广西 541004, 中国
推荐引用方式 GB/T 7714	赵敏,曾成,刘再华. 土地利用变化对岩溶地下水溶解无机碳及其稳定同位素组成的影响[J],2009,38(6):565-572.
APA	赵敏,曾成,&刘再华.(2009).土地利用变化对岩溶地下水溶解无机碳及其稳定同位素组成的影响.,38(6),565-572.
MLA	赵敏,et al."土地利用变化对岩溶地下水溶解无机碳及其稳定同位素组成的影响".38.6(2009):565-572.