Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.1002/ldr.2170 |
ECO-GEOMORPHOLOGICAL PROCESSES WITHIN GRASSLANDS, SHRUBLANDS AND BADLANDS IN THE SEMI-ARID KAROO, SOUTH AFRICA | |
Dickie, J. A.1; Parsons, A. J.2 | |
通讯作者 | Dickie, J. A. |
来源期刊 | LAND DEGRADATION & DEVELOPMENT
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ISSN | 1085-3278 |
EISSN | 1099-145X |
出版年 | 2012 |
卷号 | 23期号:6页码:534-547 |
英文摘要 | Vegetation type and cover play an important role in the operation of geomorphological processes by controlling runoff and sediment dynamics. In drylands, land degradation is particularly sensitive to these eco-geomorphic interactions. Although many geomorphological studies of land degradation focus on the change in hydrological response as a function of vegetation cover, few have investigated how the autogenic response of plants may influence the susceptibility of soil to erosion through a change of soil resources. This study investigates the hypothesis that shrub communities possess greater soil parameter heterogeneity compared with grasslands and assesses how these different scales of heterogeneity can influence the susceptibility of soil to erosion. Soil samples were taken from seven 60?m?x?60?m plots within grasslands, shrublands and badlands situated in the Sneeuberg uplands of the central Karoo. One hundred and eight samples per plot were analysed for bulk density, organic matter, pH, conductivity and available sodium, calcium, magnesium, potassium and phosphorus. Geostatistical analyses determined that the grassland landscape was largely homogenous in its distribution of soil parameters, whereas shrublands demonstrated an increase in heterogeneity. Periodicity in the semi-variograms indicated that regular patterns across the landscape were evident for all parameters and thus likely to represent the differences between shrub and intershrub regions, areas of high and low erodibility. More pronounced patterns were identified in the badlands. This indicates that, if the conditions are right, changes in plant-soil interactions caused by soil parameter redistribution in shrubland landscapes can exacerbate erosion, leading to further degradation in the form of badlands. Copyright (c) 2012 John Wiley & Sons, Ltd. |
英文关键词 | soil heterogeneity land degradation geostatistics Karoo South Africa badlands |
类型 | Article |
语种 | 英语 |
国家 | England |
收录类别 | SCI-E |
WOS记录号 | WOS:000312541100004 |
WOS关键词 | VEGETATION CHANGE ; OVERLAND-FLOW ; INTERRILL RUNOFF ; LAND DEGRADATION ; SURFACE SOIL ; EROSION ; WATER ; DYNAMICS ; SCALE ; HETEROGENEITY |
WOS类目 | Environmental Sciences ; Soil Science |
WOS研究方向 | Environmental Sciences & Ecology ; Agriculture |
资源类型 | 期刊论文 |
条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/173974 |
作者单位 | 1.Univ Leicester, Dept Geog, Leicester LE1 7RH, Leics, England; 2.Univ Sheffield, Dept Geog, Sheffield S10 2TN, S Yorkshire, England |
推荐引用方式 GB/T 7714 | Dickie, J. A.,Parsons, A. J.. ECO-GEOMORPHOLOGICAL PROCESSES WITHIN GRASSLANDS, SHRUBLANDS AND BADLANDS IN THE SEMI-ARID KAROO, SOUTH AFRICA[J],2012,23(6):534-547. |
APA | Dickie, J. A.,&Parsons, A. J..(2012).ECO-GEOMORPHOLOGICAL PROCESSES WITHIN GRASSLANDS, SHRUBLANDS AND BADLANDS IN THE SEMI-ARID KAROO, SOUTH AFRICA.LAND DEGRADATION & DEVELOPMENT,23(6),534-547. |
MLA | Dickie, J. A.,et al."ECO-GEOMORPHOLOGICAL PROCESSES WITHIN GRASSLANDS, SHRUBLANDS AND BADLANDS IN THE SEMI-ARID KAROO, SOUTH AFRICA".LAND DEGRADATION & DEVELOPMENT 23.6(2012):534-547. |
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