干旱区生态环境知识资源中心(Arid): Shrub encroachment occurs near previously invaded areas in Patagonia (southern South America)

Arid

DOI	10.1002/ldr.4974
	Shrub encroachment occurs near previously invaded areas in Patagonia (southern South America)
	Romero-Ovalle, Paula Esteli; Campanella, Maria Victoria; Pascual, Miguel; Garcia-Asorey, Martin; Pacheco, Cristian; Barrionuevo, Cristian; Bisigato, Alejandro Jorge
通讯作者	Romero-Ovalle, PE
来源期刊	LAND DEGRADATION & DEVELOPMENT
ISSN	1085-3278
EISSN	1099-145X
出版年	2024
卷号	35 期号:3 页码:1098-1109
英文摘要	During the last century shrub encroachment has occurred in many arid and semiarid areas of the world. Patagonia is a large xeric territory located in the southern tip of South America, which has been grazed by sheep for more than a century. In many areas overgrazing led to vegetation change (shrub encroachment), which in turn reduced sheep carrying capacity and caused ranch abandonment. However, these changes in physiognomy did not occur everywhere, and even some authors did not find evidence that shrub encroachment is currently occurring. Our objectives were to determine if encroachment really happened in NE Patagonia and, in the case of confirming shrub encroachment, to evaluate if the increase in shrub density was spatially homogeneous. We used object-based image analysis to evaluate shrub density and cover in aerial photographs taken in 1970 and 2018. In both dates, shrub density showed a clear contrast between two kinds of areas showing higher and lower density than was expected by chance. Shrub density and cover more than doubled between 1970 and 2018. This increase was concentrated in those areas with moderate or high densities of shrubs in 1970. Our results confirm the occurrence of shrub encroachment in NE Patagonia and demonstrate that it is currently concentrated near previously invaded areas. These findings have implications when defining protocols for monitoring shrub encroachment since monitors should focus on both areas that already have shrubs and areas that lack them.
英文关键词	Patagonia shrub cover shrub density shrub encroachment spatial pattern
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:001093424200001
WOS关键词	WOODY PLANT ENCROACHMENT ; ORIENTED IMAGE-ANALYSIS ; ECOSYSTEM STRUCTURE ; SEMIARID SAVANNA ; VEGETATION ; PATTERNS ; INVASION ; DYNAMICS ; RAINFALL ; DESERTIFICATION
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/2XILL650/404839
推荐引用方式 GB/T 7714	Romero-Ovalle, Paula Esteli,Campanella, Maria Victoria,Pascual, Miguel,et al. Shrub encroachment occurs near previously invaded areas in Patagonia (southern South America)[J],2024,35(3):1098-1109.
APA	Romero-Ovalle, Paula Esteli.,Campanella, Maria Victoria.,Pascual, Miguel.,Garcia-Asorey, Martin.,Pacheco, Cristian.,...&Bisigato, Alejandro Jorge.(2024).Shrub encroachment occurs near previously invaded areas in Patagonia (southern South America).LAND DEGRADATION & DEVELOPMENT,35(3),1098-1109.
MLA	Romero-Ovalle, Paula Esteli,et al."Shrub encroachment occurs near previously invaded areas in Patagonia (southern South America)".LAND DEGRADATION & DEVELOPMENT 35.3(2024):1098-1109.