典型岩溶区不同土地利用类型土壤CO_(2)浓度时空变化特征及影响因素分析——以贵州双河洞为例  

Spatiotemporal Variation Characteristics of CO_(2) and its Influencing Factors under Different Land Use Types in Typical Karst Areas——A Case Study of the Shuanghe Cave,Guizhou

作　　者：郑维熙 周忠发[1,2] 朱粲粲 梅再美 汤云涛[1,2] 安丹 ZHENG Wei-xi;ZHOU Zhong-fa;ZHU Can-can;MEI Zai-mei;TANG Yun-tao;AN Dan(College of Geography and Environmental Science/Karst Institute,Guizhou Normal University,Guiyang 550001,China;National Key Laboratory Breeding Base of Karst Mountain Ecological Environment in Guizhou Province,Guiyang 550001,China)

机构地区：[1]贵州师范大学地理与环境科学学院/喀斯特研究院,贵州贵阳550001 [2]贵州省喀斯特山地生态环境国家重点实验室培育基地,贵州贵阳550001

出　　处：《土壤通报》2021年第3期594-601,共8页Chinese Journal of Soil Science

基　　金：国家自然科学基金项目(41361081,41661088);贵州师范大学资助博士科研项目(GZNUD[2017]6号);贵州省高层次创新型人才培养计划(黔科合平台人才[2016]5674)资助。

摘　　要：为揭示典型岩溶地区不同用地类型下土壤CO_(2)的时空变化特征及其影响因素,于2018年1月~2019年8月对白云岩分布的贵州绥阳双河洞地区6种典型用地的5、20、40和60 cm深度土壤CO_(2)浓度进行了为期一年的监测、采样和室内实验。并运用数理统计分析方法对各指标进行综合分析,进一步探究影响土壤CO_(2)时空变化的主要影响因子。结果表明:不同用地类型下土壤CO_(2)各深度平均浓度均表现出明显的夏秋高、冬春低的季节性变化特征,年平均浓度最高出现在10月,浓度值为23276 ppm,最低在1月,浓度值为6602 ppm;不同用地类型下土壤CO_(2)浓度表现为旱地(19967 ppm)>灌草地(17098 ppm)>灌丛地(15054 ppm)>有林地(11494 ppm)>退耕还林地(10529 ppm)>撂荒地(6147 ppm),且除有林地土壤CO_(2)随着深度加深,表现出先减小后增加的特征外,其余五种用地类型下土壤CO_(2)均表现出随土层深度增加而增加的趋势;土壤温度、土壤含水量、有机碳含量、孔隙度与土壤CO_(2)浓度均成正相关关系,相关系数分别为0.406、0.252、0.382、0.703。相关性分析表明土壤温度、土壤孔隙度对土壤中CO_(2)的产生和保存具有显著影响。In order to reveal the temporal and spatial variation characteristics of soil CO_(2) and its influencing factors under different land use types in the typical karst areas,the CO_(2) concentration of 5 cm,20 cm,40 cm,and 60 cm depths of six typical sites in the Shuanghe Cave,Suiyang,Guizhou was detected from January 2018 to August 2019.And the main factors affecting the spatial and temporal changes of soil CO_(2) were investigated.The results showed that:(1)The soil CO_(2) concentration under different land types showed obvious seasonal variation characteristics,being higher in summer and autumn and lower in winter and spring.The annual average concentration of CO_(2) was the highest in October(23276 ppm),and was the lowest in January(6602 ppm).(2)The soil CO_(2) concentration under different land types decreased in the order of dry land(19967 ppm)>grassland(17098 ppm)>shrub land(15054 ppm)>forest land(11494 ppm)>returning farmland to forestland(10529 ppm)>wasteland(6147 ppm).The soil CO_(2) concentration in the forest land showed a decreasing first and then increasing trend with soil depths,while the CO_(2) concentrations in the other five land types were increased with soil depths.(3)The soil CO_(2) concentration was positively correlated with soil temperature,soil moisture content,organic carbon content,and porosity,with a correlation coefficient of 0.406,0.252,0.382,and 0.703,respectively.Correlation analysis showed that soil temperature and soil porosity had significant effects on the generation and preservation of CO_(2) in soil.The research results are of great significance for evaluating the effects of land types in typical karst areas on soil carbon sources and sinks,and would provide a certain theoretical reference for investigating the vertical carbon cycling in a key karst zones.

关 键 词：典型岩溶区 不同用地类型 土壤CO_(2)浓度 时空变化 影响因素 

分 类 号：S147.2[农业科学—肥料学]