赣南不同母质及植被覆盖红壤有机碳矿化研究  

Study on Organic Carbon Mineralization of Red Soil Developed from Different Parent Materials and Vegetation Coverage

作　　者：覃灵华[1] 徐祥明[2] 冷雄 黄艳[2] 张羿[2] QIN Linghua;XU Xiangming;LENG Xiong;HUANG Yan;ZHANG Yi(College of Life and Environment Science, Gannan Normal University, Ganzhou 341000, China;College of Geography and Planning, Gannan Normal University, Ganzhou 341000, China)

机构地区：[1]赣南师范大学生命与环境科学学院,江西赣州341000 [2]赣南师范大学地理与规划学院,江西赣州341000

出　　处：《生态环境学报》2016年第9期1453-1460,共8页Ecology and Environmental Sciences

基　　金：国家自然科学基金项目(41301226);江西省自然科学基金项目(20132BAB213020);江西省教育厅青年科学基金项目(GJJ13645);赣南师范学院大学生创新训练计划项目

摘　　要：为探明不同母质及植被覆盖红壤有机碳矿化的变化规律，采集赣南地区3种不同成土母质（花岗岩风化堆积物、红砂岩风化堆积物、第四纪红土）及不同植被覆盖模式（林草地、灌草地、裸地）下的红壤样品，通过密闭培养法对有机碳矿化动态进行分析，结果表明，（1）花岗岩和第四纪红土母质土壤有机碳矿化速率表现为林草地>灌草地>裸地，红砂岩母质土壤则表现为灌草地>林草地>裸地，裸地土壤有机碳矿化速率较其他植被覆盖低。（2）有机碳日均矿化量随土壤深度及培养时间（28d）的增加而降低；培养14d，有机碳矿化累积量高达总量的70.26%~86.36%；培养14d后，有机碳日均矿化量较小且相对稳定。有机碳矿化量与植被覆盖率呈显著正相关关系（P<0.05）。（3）不同母质及植被覆盖对土壤有机碳释放CO2-C分配比例有较大影响，第四纪红土红壤有机碳释放CO2-C分配比例最大，固碳能力较弱；裸地土壤有机碳矿化释放CO2-C分配比例最大，固碳能力较弱。In order to reveal the dynamic change of soil organic carbon (SOC) mineralization developed from different parentmaterials and vegetation coverage. Soil samples developed from three parent materials (the granite, red sandstone and quaternary redearth) under different vegetation coverage (woodland, shrub land and bare land) were selected in Gannan area, Jiangxi province, toexplore the dynamic change of soil organic carbon mineralization by using incubation method. The results show that, (1) As to soilsdeveloped from granite and quaternary parent materials, the rank of SOC mineralization rate was woodland>shrub land>bare land.While the rank was shrub land>woodland>bare land as to soils developed from red sandstone parent material. In summary, themineralization rate of bare land was lower than the other two vegetation coverage. (2) The mineralization accumulation per daydeceased as the increase of soil horizon depth and cultivate time. The mineralization accumulation of the former 14 days occupied70.26% to 86.36% of the total accumulation. The SOC mineralization accumulation was positive correlated with vegetation coveragesignificantly at the level of P<0.05. And (3) the parent materials and vegetation coverage impact on the ratio of CO2-C released bymineralization. The ratio was higher of red soil developed from quaternary than the other two parent materials, and the ratio washigher of bare land red soil compared with the other vegetation coverage which means lower carbon sequestration capacity.

关 键 词：赣南 红壤 有机碳矿化 植被覆盖率 

分 类 号：X171[环境科学与工程—环境科学]