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	Spatial variability of soil organic carbon in a catchment of the Loess Plateau
	Han F. P. ; Hu W. ; Zheng J. Y. ; Du F. ; Zhang X. C.
	2010
关键词	Geo-statistical analyses land-use china geostatistics dynamics storage stock
英文摘要	The issue of soil organic carbon (SOC) is of increasing concern. Because SOC, as an important soil component in farming systems, is essential for improving soil quality, sustaining food production and quality, and maintaining water quality and as a major part of the terrestrial carbon reservoir, it plays an important role in the global carbon cycle. In this paper, a total of 665 soil samples from different depths were collected randomly in the autumn of 2007, and the spatial variability of SOC content at a small catchment of the Loess Plateau was analysed using classical statistics and geo-statistical analysis. In nonsampled areas classical kriging was utilized for interpolation of SOC estimation. The classic statistical analysis revealed moderate spatial variability with all five layers of SOC-content. In addition, the average SOC content decreased with soil depth and the relationship can be modelled by an exponential equation (y=3.1795x -1.2015, R 2=0.9866) and all of the SOC-content data in the different depth were normally distributed. The geo-statistical analysis indicated a moderate spatial dependence in 0-60 cm, while in the 60-80 cm depth spatial dependence was strong. The semi-variogram could be fitted by an exponential model for 0-10 cm depth; by a spherical model for 10-20 cm depth and 60-80 cm depth; and by a Gaussian model for 20-60 cm depth. The range increases with increasing depth. In addition, classical kriging could successfully interpolate SOC content in the catchment. In general, the geo-statistics method on a watershed scale could be accurately used to evaluate spatial variability of the SOC content in the Loess Plateau, China.
出处	Acta Agriculturae Scandinavica Section B-Soil and Plant Science
卷	60
期	2
页	136-143
收录类别	SCI
语种	英语
ISSN号	0906-4710
内容类型	SCI/SSCI论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/23896]
专题	地理科学与资源研究所_历年回溯文献
推荐引用方式 GB/T 7714	Han F. P.,Hu W.,Zheng J. Y.,et al. Spatial variability of soil organic carbon in a catchment of the Loess Plateau. 2010.

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