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	Soil properties and their spatial pattern in a degraded sandy grassland under post-grazing restoration, inner Mongolia, northern China
	Su, Yong Zhong; Li, Yu Lin; Zhao, Ha Lin
刊名	BIOGEOCHEMISTRY
	2006-07-01
卷号	79期号:3页码:297-314
关键词	degraded sandy grassland grazing restoration soil properties spatial heterogeneity semivariograms
ISSN号	0168-2563
DOI	10.1007/s10533-005-5273-1
通讯作者	Su, Yong Zhong(suchengyang@yahoo.com.cn)
英文摘要	In this study, we use classical and geostatistical methods to identify characteristics of some selected soil properties including soil particle size distribution, soil organic carbon, total nitrogen, pH and electrical conductivity and their spatial variation in a 5-year recovery degraded sandy grassland after two different grazing intensity disturbance: post-heavy-grazing restoration grassland (HGR) and post-moderately grazing restoration grassland (MGR), respectively, in Horqin steppe, Inner Mongolia, northern China. The objective was to examine effect of grazing intensity on spatial heterogeneity of soil properties. One hundred soil samples were taken from the soil layer 0-15 cm in depth of a grid of 10 mx10 m under each treatment. The results showed that soil fine fractions (very fine sand, 0.1-0.05 mm and silt + clay, < 0.05 mm), soil organic carbon and total nitrogen concentrations were significant lower and their coefficients of variation significant higher under the HGR than under the MGR. Geostatistical analysis of soil heterogeneity revealed that soil particle size fractions, organic carbon and total nitrogen showed different degree of spatial dependence with exponential or spherical semivariograms on the scale measured under HGR and MGR. The spatial structured variance account for a large proportion of the sample variance in HGR plot ranging from 88% to 97% for soil particle fractions, organic C and total N, however, except for organic C (88.8%), the structured variance only account for 50% of the sample variance for soil particle fractions and total N in the MGR plot. The ranges of spatial autocorrelation for coarse-fine sand, very fine sand, silt + clay, organic C and total N were 13.7 m, 15.8 m, 15.2 m, 22.2 m and 21.9 m in HGR plot, respectively, and was smaller than in MGR plot with the corresponding distance of 350 m, 144.6 m, 45.7 m, 27.3 m and 30.3 m, respectively. This suggested that overgrazing resulted in an increase in soil heterogeneity. Soil organic C and total N were associated closely with soil particle fractions, and the kriging-interpolated maps showed that the spatial distribution of soil organic C and total N corresponded to the distribution patterns of soil particle fractions, indicating that high degree of spatial heterogeneity in soil properties was linked to the distribution of vegetative and bare sand patches. The results suggested that the degree of soil heterogeneity at field scale can be used as an index for indicating the extent of grassland desertification. Also, the changes in soil heterogeneity may in turn influence vegetative succession and restoration process of degraded sandy grassland ecosystem.
收录类别	SCI
WOS关键词	HETEROGENEITY ; DESERTIFICATION ; CARBON ; DEPENDENCE ; PLANTS
WOS研究方向	Environmental Sciences & Ecology ; Geology
WOS类目	Environmental Sciences ; Geosciences, Multidisciplinary
语种	英语
出版者	SPRINGER
WOS记录号	WOS:000239020800002
内容类型	期刊论文
URI标识	http://www.corc.org.cn/handle/1471x/2555779
专题	寒区旱区环境与工程研究所
通讯作者	Su, Yong Zhong
作者单位	Chinese Acad Sci, Cold & Arid Reg Environm & Engn Res Inst, Lanzhou 730000, Peoples R China
推荐引用方式 GB/T 7714	Su, Yong Zhong,Li, Yu Lin,Zhao, Ha Lin. Soil properties and their spatial pattern in a degraded sandy grassland under post-grazing restoration, inner Mongolia, northern China[J]. BIOGEOCHEMISTRY,2006,79(3):297-314.
APA	Su, Yong Zhong,Li, Yu Lin,&Zhao, Ha Lin.(2006).Soil properties and their spatial pattern in a degraded sandy grassland under post-grazing restoration, inner Mongolia, northern China.BIOGEOCHEMISTRY,79(3),297-314.
MLA	Su, Yong Zhong,et al."Soil properties and their spatial pattern in a degraded sandy grassland under post-grazing restoration, inner Mongolia, northern China".BIOGEOCHEMISTRY 79.3(2006):297-314.

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