生态学杂志2012，Vol.31Issue(11)：2748-2754,7.
桂西北石灰土土壤有机碳矿化对外源有机物质和碳酸钙的响应
Organic carbon mineralization in lime soils in Karst region of Guangxi, South China in response to exogenous organic substrate and calcium carbonate
摘要
Abstract
To elucidate the effects of exogenous organic substrate and calcium carbonate on the organic carbon mineralization in lime soils and to deepen the understanding of the characteristics of soil organic carbon turnover, the terra fusca, rendzina, and zonal red soil were collected from the Karst region in Huanjiang of Guangxi, and a 100-day incubation experiment was conducted, with the fluxes of CO2 and 14C-CO2 from the soils determined. Three treatments were installed, i. e. , no exogenous addition (CK) , addition of 14 C-labeled rice straw (S) , and addition of 14C-labeled calcium carbonate ( C ) . In treatments S and C , the mineralization of soil organic carbon was promoted obviously, and the priming effect of 14C-labeled rice straw and C-labeled calcium carbonate on the organic carbon mineralization in the terra fusca, rendzina, and zonal red soil after 100-day incubation was 28. 7% , 46. 2% , and 15. 5% , and 127. 0% , 175. 3% , and 100. 1% , respectively. In the apparent cumulative mineralization, the contribution rate of 14 C-1a- beled calcium carbonate in the terra fusca, rendzina, and zonal red soil was 40. 4% , 48. 4% , and 19.6%, respectively. Soil type, exogenous additives, and their interaction had significant effects on the priming effect of the soil organic carbon mineralization, the contribution of the additives to the apparent cumulative mineralization, and the cumulative mineralization volume ( or rate) (P＜0. 01). This study indicated that the addition of exogenous organic substrate and calcium carbonate altered the characteristics of soil organic carbon mineralization, and, as for the lime soils, the contribution of inorganic carbonate should be taken into consideration in the study of the mineralization and turnover of soil organic carbon and the assessment of their effects on atmosphere CO2.关键词
喀斯特/土壤有机碳矿化/激发效应/无机碳/14C示踪技术Key words
soil organic carbon mineralization/ priming effect/ inorganic carbon/ 14C tracer technique分类
农业科技引用本文复制引用
葛云辉,苏以荣,邹冬生,胡乐宁,冯书珍,肖伟,何寻阳..桂西北石灰土土壤有机碳矿化对外源有机物质和碳酸钙的响应[J].生态学杂志,2012,31(11):2748-2754,7.基金项目
中国科学院战略性先导科技专项(XDA05070403)、中国科学院西部行动计划项目(KZCX2-XB3-10)、国家自然科学基金项目(30970538和41171246)和中国科学院亚热带农业生态研究所青年人才领域前沿项目(ISACX-LYQY-QN-1101)资助. （XDA05070403）
