现在的位置: 首页土地资源与规划管理>正文
[SCI]Spatial Variability of Soil Organic Carbon and Related Factors in Jiangsu Province, China
2012年03月01日 土地资源与规划管理 暂无评论

Spatial Variability of Soil Organic Carbon and Related Factors in Jiangsu Province, China

CHUAI Xiao-Wei, HUANG Xian-Jin, WANG Wan-Jing, ZHANG Mei, LAI Li and LIAO Qi-Lin

Pedosphere 22(3):404–414,2012

Abstract: Soil organic carbon (SOC) plays a key role in the global carbon cycle. In this study, we used statistical and geostatistical methods to characterize and compare the spatial heterogeneity of SOC in soils of Jiangsu Province, China, and investigate the factors that influence it, such as topography, soil type, and landuse. Our study was based on 24186 soil samples obtained from the surfaces oil layer (0–0.2m) and covering the entire area of the province. Interpolated values of SOC density in the surface layer, obtained by kriging based on aspherical model, ranged between 3.25 and 32.43kgm−3. The highest SOC densities tended to occur in the Taihu Plain, Lixia River Plain, along the Yangtze River, and in high-elevation hilly areas such as those in northern and southwest Jiangsu, while the lowest values were found in the coastal plain. Elevation, slope, soil type, and land use type significantly affected SOC densities. Steeper slope tended to result in SOC decline. Correlation between elevation and SOC densities was positive in the hill areas but negative in the low plain areas, probably due to the effect of different land covertypes, temperature, and soil fertility. High SOC densities were usually found in limestone and paddy soils and lowdensities in coastal saline soils and alluvial soils, indicating that high clay and silt contents in the soils could lead to an increase, and high sand content to adecrease in the accumulation of SOC. SOC densities were sensitive to land use and usually increased in towns, woodland, paddy land, and shallow water areas, which were strongly affected by industrial and human activities, covered with highly productive vegetation, or subject to long-term use of organic fertilizers or flooding conditions.

KeyWords: industrial and human activities, land cover, land use, soil type, topography

Download 全文下载

给我留言

您必须 [ 登录 ] 才能发表留言!

×
腾讯微博