干旱区生态环境知识资源中心(Arid): A regional, remote sensing-based approach to mapping land degradation in the Little Karoo, South Africa

Arid

DOI	10.1016/j.jaridenv.2023.105066
	A regional, remote sensing-based approach to mapping land degradation in the Little Karoo, South Africa
	Kirsten, Tim; Hoffman, Michael Timm; Bell, Wesley Drummond; Visser, Vernon
通讯作者	Kirsten, T
来源期刊	JOURNAL OF ARID ENVIRONMENTS
ISSN	0140-1963
EISSN	1095-922X
出版年	2023
卷号	219
英文摘要	There is growing global consensus that assessments of land degradation be conducted at regional or smaller scales. Working at this scale allows for locally relevant environmental and land use conditions to be incorporated into the assessment methodology. In this paper, a recently developed regional approach to assessing land degradation in the Hardeveld bioregion of the Succulent Karoo is applied to the Little Karoo region of this biome. The methodology uses fuzzy classification statistical techniques to combine field data with multiple Sentinel-2A and Landsat vegetation indices, as well as regionally modelled soil variables. The resultant habitat condition archetype map values show strong correlation with field observations of perennial plant and bare soil cover in 96 ground-truthed plots. The archetype map indicates that heavily degraded hotspots of high bare ground cover occur throughout the project region, although there is an overall lower average habitat condition in the western half of the Little Karoo. The mean habitat condition archetype value for the entire project area is 0.54 (standard deviation = 0.13), on a continuous scale where 0 and 1 represent the most degraded and pristine extremes, respectively. Random forest regression analysis of various environmental covariates of degradation indicates a strong relationship between habitat condition and topographic as well as rainfall variables, although the limited accuracy of modelled livestock data may obscure the negative impacts of overgrazing. The 30 m resolution habitat condition archetype map builds upon previous degradation research in the Little Karoo and has the potential to inform future conservation, restoration, and rangeland management decisions. The methodology was successfully transferred to a new region and provides an opportunity to improve reporting on the extent of land degradation across South Africa.
英文关键词	Desertification Drylands Habitat condition Land degradation assessment Remote sensing
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:001078154200001
WOS关键词	SUCCULENT KAROO ; PLANT DIVERSITY ; RANGELAND
WOS类目	Ecology ; Environmental Sciences
WOS研究方向	Environmental Sciences & Ecology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/397168
推荐引用方式 GB/T 7714	Kirsten, Tim,Hoffman, Michael Timm,Bell, Wesley Drummond,et al. A regional, remote sensing-based approach to mapping land degradation in the Little Karoo, South Africa[J],2023,219.
APA	Kirsten, Tim,Hoffman, Michael Timm,Bell, Wesley Drummond,&Visser, Vernon.(2023).A regional, remote sensing-based approach to mapping land degradation in the Little Karoo, South Africa.JOURNAL OF ARID ENVIRONMENTS,219.
MLA	Kirsten, Tim,et al."A regional, remote sensing-based approach to mapping land degradation in the Little Karoo, South Africa".JOURNAL OF ARID ENVIRONMENTS 219(2023).