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。
To reveal the distribution characteristics of soil organic carbon （SOC） and to study the influence of human activities on SOC in Karst area, 22 786 soil samples collected from 2 854 soil profiles were analyzed. Spatial distribution characteristics of SOC under different land uses in Guizhou Province were discussed. Combined with the control plan of rocky desertification in Guizhou Province, carbon sequestration caused by rocky desertification prevention and control was assessed. The results indicated that the SOC content in Guizhou was high, and the SOC density was low. The average SOC content in top soil （0--20 cm） was 25.07 g/kg, but the average SOC density was only 4.27 kg/m2. The SOC content of top soil in different land uses followed the order： shrub lands 〉 arbor-shrub mixed forest lands 〉shrub grass lands 〉 arbor forest lands abandoned lands and uncultivated lands ） grasslands ） paddy lands 〉 garden lands ） arid lands and sloping croplands. The SOC density of top soil in different land uses descended in the order： paddy lands shrub lands 2〉 arbor forest lands 〉arbor-shrub mixed forest lands 〉 abandoned lands and uncultivated lands ） shrub grass lands 〉 arid lands and sloping croplands ） grasslands ） garden lands. The SOC con- tent of top 60 em soil was sensitive to human disturbance, and small discrepancies were observed among SOC contents of different land uses in deeper soil layers. If the rocky desertifieation prevention and control project （including returning farmland to forests, construction of artificial pasture, and artificial afforestation） was carried out efficiently, the SOC storage in Guizhou Province would be obviously promoted. Up to year 2050, at calculating depth of 0-10, 0-20, 0-30 and 0-100 cm, the total SOC sequestration caused by this pro- ject would be up to 1.99× 10^13, 3.37× 10^13, 4.45× 10^13 and 6.29 × 10^13 g. In conclusion, the SOC of Karst areas was characterized by high content and low density, and the implementation of the rocky desertification prevention and control project was propitious to carbon sequestration in Karst areas.
作者
黄先飞
周运超
张珍明
HUANG Xianfei ZHOU Yunchao ZHANG Zhenming(Institute for Forest Resources ＆ Environment of Guizhou, Guizhou University, Guiyang 550025 College of Forestry, Guizhou University, Guiyang 550025 Guizhou Key Laboratory of Mountain Environment, Guizhou Normal University, Guiyang 550001 Puding Karst Ecosystem Research Station of Guizhou Province, Puding, Guizhou 562100)
出处
《水土保持学报》
CSCD
北大核心
2017年第5期215-221,共7页
Journal of Soil and Water Conservation
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)
关键词
石漠化
土壤有机碳
土地利用
碳汇
环境政策
喀斯特
rocky desertification
soil organic carbon
land use
carbon sink
environment policy
Karst
