会仙喀斯特溶洞湿地、稻田和旱田土壤有机碳含量及其与养分的关系  

Content of Soil Organic Carbon and Its Relationship with Nutrients in Karst Cave Wetlands, Paddy Fields and Dry Farmlands in Huixian

作　　者：靳振江[1,2,3] 程亚平[1,2] 李强[3] 曾鸿鹄[1,2] 罗堃[2] 黄静云[2] 陆文体[2] 唐志琴[2] 

机构地区：[1]广西环境污染控制理论与技术重点实验室,桂林理工大学,广西桂林541004 [2]桂林理工大学环境科学与工程学院,广西桂林541004 [3]广西岩溶动力学重点实验室,中国地质科学院岩溶地质研究所国土资源部,广西桂林541004

出　　处：《湿地科学》2014年第4期485-490,共6页Wetland Science

基　　金：国家自然科学基金项目(41361054、41003038和51268008);广西自然科学基金项目(2011GXNSFD018002、2011GXNSFA018006和2010GXNSFB013004);岩溶动力学重点实验室基金项目(KDL2010-02和KDL2011-10);广西高等学校立项科研项目(201204LX162和201106LX229);广西科学研究与技术开发计划项目(桂科合14123001-13);桂林市科学研究与技术开发计划项目(20140122-1)资助

摘　　要：以桂林会仙喀斯特溶洞湿地及其附近的稻田和旱田表层土壤为研究对象,采用常规方法,测定土壤有机碳和养分含量,并分析二者之间的关系。结果显示,喀斯特溶洞湿地的土壤有机碳含量为（21.77±1.42）g/kg,与稻田的土壤有机碳含量[（22.33±1.19）g/kg]没有显著差异,而旱田土壤有机碳含量为（12.78±0.22）g/kg,比湿地土壤低41.30%。稻田土壤的全氮含量、碱解氮含量、pH、阳离子交换量、交换性钙和交换性镁含量都与喀斯特溶洞湿地土壤无显著差异。但是,上述指标在旱田土壤中较低,降低幅度为15.63%-50.87%。统计结果表明,所有土壤全氮含量和pH与土壤有机碳含量都呈显著正相关（p〈0.01）;土壤碱解氮、阳离子交换量、交换性钙和交换性镁与土壤有机碳含量都显著正相关（p〈0.05）。因此,土壤碱解氮、阳离子交换量、交换性钙和交换性镁对维持喀斯特溶洞湿地和稻田土壤较高的土壤有机碳水平具有重要的作用。The purpose of this study is to investigate the effect of landuse types on soil carbon sink in karst cave wetland ecosystem. Soil samples from karst cave wetlands, paddy fields and dry farmlands were collected from Huixian wetlands in Guilin. Contents of soil organic carbon and soil nutrients were detected using conventional methods and their correlation were analyzed. The results showed that the soil organic carbon contents were （21.77 ±1.42） g/kg and （22.33 ±1.19） g/kg in karst cave wetlands and paddy fields, respectively. Contents of soil organic carbon in dry farmlands were （12.78 ±0.22） g/kg and 41.30% lower than those in karst cave wetlands. The pH, cation exchange capacity, contents of total nitrogen, alkali-hydrolyzable nitrogen, exchangeable calcium and exchangeable magnesium in paddy fields were no significantly difference with those in karst cave wetlands. But the above parameters in dry farmlands were decreased 15.63%-50.87% in comparison with those in karst cave wetlands. Statistical analysis revealed a significant correlation of soil organic carbon with the total nitrogen and pH, respectively （p〈0.01）, as well as a significant correlation of soil organic carbon with the contents of alkali-hydrolyzable nitrogen, cation exchange capacity, exchangeable calcium and exchangeable magnesium, respectively （P〈0.05） across landuse types. These results indicated that the above nutrients can promote soil organic carbon accumulation in karst cave wetlands and paddy fields.

关 键 词：土壤有机碳 喀斯特溶洞湿地 土地利用 

分 类 号：S153[农业科学—土壤学]