喀斯特石漠化区不同土地利用方式下土壤有机碳分布特征

发布时间：2018-05-20 12:46

本文选题：石漠化 + 土壤有机碳　；参考：《水土保持学报》2017年05期

【摘要】：为探究喀斯特土壤有机碳分布特征及其对人为干扰的响应,挖掘了2 854个土壤剖面,采集了22 786个土壤样品,分析了贵州省不同土地利用方式下土壤有机碳分布规律;并结合贵州省石漠化防治规划,初步估算了石漠化防治工程的土壤碳增汇贡献。结果表明:贵州省土壤有机碳呈现含量高、密度小的特征。表层土壤(0-20cm)有机碳平均含量25.07g/kg,平均密度仅为4.27kg/m~2。不同用地类型土壤表层有机碳含量大小为灌木林地乔灌木林地灌草地乔木林地弃耕地与荒地草地水田园地旱地与坡耕地;表层碳密度大小为水田灌木林地乔木林地乔灌木林地弃耕地与荒地灌草地旱地与坡耕地草地园地。0-60cm土层土壤有机碳含量对人为干扰较为敏感,60-100cm土层土壤有机碳含量差异较小。实施退耕还林,人工种草及人工造林等石漠化防治工程会明显促进土壤有机碳的积累,到2050年,贵州省0-10,0-20,0-30,0-100cm土层土壤有机碳将增加1.99×10~(13),3.37×10~(13),4.45×10~(13),6.29×10~(13) g。可见,喀斯特地区土壤有机碳具有含量高、密度低的显著特征,石漠化治理能有效增加喀斯特地区土壤碳汇。
[Abstract]:In order to investigate the distribution characteristics of organic carbon in karst soil and its response to human disturbance, 2854 soil sections were excavated, 22 786 soil samples were collected, and the distribution of soil organic carbon under different land use patterns in Guizhou Province was analyzed. The contribution of soil carbon sequestration in the rocky desertification control project was preliminarily estimated with the planning of rocky desertification control in Guizhou province. The results showed that soil organic carbon content was high and density was low in Guizhou province. The average organic carbon content was 25.07 g / kg, and the average density was only 4.27 kg 路m ~ (-1) 路m ~ (2) 路kg ~ (-1). The soil surface organic carbon content of different land types was shrub land, shrub forest land, abandoned cultivated land, wasteland grassland, paddy field, garden land, The content of soil organic carbon in the soil layer of 0-60cm soil layer is sensitive to anthropogenic disturbance. The difference of soil organic carbon content between abandoned cultivated land and shrubbery forest land, irrigated grassland land, arid land and grassland garden of sloping land is relatively sensitive to anthropogenic disturbance. There is little difference in soil organic carbon content between 60 and 100 cm soil layer. The implementation of rocky desertification control projects such as returning cropland to forest, artificial recommendation and artificial afforestation will obviously promote the accumulation of soil organic carbon. By 2050, the soil organic carbon in 0-10 ~ 20 ~ 30 ~ 100 cm soil layer in Guizhou Province will be increased by 1.99 脳 10 ~ (10) ~ (13) ~ (13) ~ 3.37 脳 10 ~ (10) ~ (13) ~ (4.45 脳 10 ~ (6) ~ (29) 脳 10 ~ (10) ~ (13) g of soil organic carbon. It can be seen that soil organic carbon in karst area has the characteristics of high content and low density, and rocky desertification control can effectively increase soil carbon sink in karst area.
【作者单位】：贵州大学贵州省森林资源与环境研究中心;贵州大学林学院;贵州师范大学省山地环境重点实验室;贵州普定喀斯特生态系统观测研究站;
【基金】：国家重大科学研究计划项目(2013CB956702) 贵州省科技计划项目(黔科合[J]字2014-2002-03) 贵州省百层次人才计划项目(2015-4022)
【分类号】：S153.6

【相似文献】