干旱区生态环境知识资源中心(Arid): Soil erosion facilitates shrub encroachment in Patagonian herbaceous steppes

Arid

DOI	10.1002/ldr.4016
	Soil erosion facilitates shrub encroachment in Patagonian herbaceous steppes
	Romero Ovalle, Paula Esteli; Jorge Bisigato, Alejandro; Victoria Campanella, Maria
通讯作者	Bisigato, AJ (corresponding author), Inst Patagon Estudio Ecosistemas Continentales, IPEEC, CONICET, Blvd Brown 2915, RA-9120 Puerto Madryn, Chubut, Argentina.
来源期刊	LAND DEGRADATION & DEVELOPMENT
ISSN	1085-3278
EISSN	1099-145X
出版年	2021
卷号	32 期号:11 页码:3377-3385
英文摘要	Previous studies in northeastern Patagonia suggested that, mainly as a consequence of overgrazing by sheep, the herbaceous steppes are being replaced by shrub steppes dominated by Chuquiraga avellanedae as a consequence of shrub encroachment. The herbaceous steppe presents a thick sandy loam to loamy sand A-horizon lying on a clay-horizon while the shrub steppe presents the clay-horizon at or near the soil surface. The thickness reduction of the remaining A-horizon and the formation of desert pavements are evidence of soil erosion. As previous studies suggested that shrub encroachment co-occurs with the erosion of the sandy A-horizon, we hypothesized that shrub encroachment is favored by the presence of an clay-horizon near the soil surface. We expected that C. avellanedae emergence and establishment would be higher as the clay horizon is closer to the soil surface and the A-horizon is reduced. We performed field and greenhouse experiments to evaluate seedling emergence and establishment along a gradient of A-horizon thickness. We found that the presence of a relatively thin sandy layer on the surface had a negative influence on both shrub emergence and establishment. The summer drought was not a critical period for the seedlings. Conversely, the highest seedling mortality took place during late winter in sandy soils, suggesting that these soils are more susceptible to frost heaving than clay soils. In conclusion, soil erosion in the northeastern Patagonian steppes would indirectly facilitate shrub encroachment due to differences in frost heaving susceptibility between sandy and clay soils.
英文关键词	frost heaving Patagonia seedling survival shrub encroachment soil erosion
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000662476200001
WOS关键词	WOODY PLANT ENCROACHMENT ; CLIMATE-CHANGE ; VEGETATION ; DYNAMICS ; PATTERNS ; RAINFALL ; DEGRADATION ; RANGELANDS ; INVASION ; SAVANNA
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/2XILL650/351087
作者单位	[Romero Ovalle, Paula Esteli; Jorge Bisigato, Alejandro; Victoria Campanella, Maria] Inst Patagon Estudio Ecosistemas Continentales, IPEEC, CONICET, Blvd Brown 2915, RA-9120 Puerto Madryn, Chubut, Argentina; [Jorge Bisigato, Alejandro] Univ Nacl Patagonia San Juan Bosco UNPSJB, Fac Ciencias Nat & Salud, Puerto Madryn, Argentina
推荐引用方式 GB/T 7714	Romero Ovalle, Paula Esteli,Jorge Bisigato, Alejandro,Victoria Campanella, Maria. Soil erosion facilitates shrub encroachment in Patagonian herbaceous steppes[J],2021,32(11):3377-3385.
APA	Romero Ovalle, Paula Esteli,Jorge Bisigato, Alejandro,&Victoria Campanella, Maria.(2021).Soil erosion facilitates shrub encroachment in Patagonian herbaceous steppes.LAND DEGRADATION & DEVELOPMENT,32(11),3377-3385.
MLA	Romero Ovalle, Paula Esteli,et al."Soil erosion facilitates shrub encroachment in Patagonian herbaceous steppes".LAND DEGRADATION & DEVELOPMENT 32.11(2021):3377-3385.