干旱区生态环境知识资源中心(Arid): Modeling Invasive Annual Grass Abundance in the Cold Desert Ecoregions of the Interior Western United States

Arid

DOI	10.1016/j.rama.2019.09.003
	Modeling Invasive Annual Grass Abundance in the Cold Desert Ecoregions of the Interior Western United States
	Hak, John C.; Comer, Patrick J.
通讯作者	Hak, John C.
来源期刊	RANGELAND ECOLOGY & MANAGEMENT
ISSN	1550-7424
EISSN	1551-5028
出版年	2020
卷号	73 期号:1 页码:171-180
英文摘要	Invasive annual grasses, primarily Bromus tectorum, are a severe risk to native vegetation of the inter-mountain West. Once established, annual grasses alter natural fire regimes and outcompete natives until, in some places, they become the overwhelming dominant. We developed a regional spatial model encompassing eight ecoregions to indicate the relative abundance of invasive annual grass at five levels of canopy cover. We used field sample data representing invasive annual grass abundance to build and calibrate the model. Explanatory variables, represented as map inputs, included image indices, climate, landform, soil, and human-induced surface disturbance. As a novel modeling approach, we built multiple models based on classes of invasive annual grass cover abundance were developed individually and then combined into a final 90-m pixel resolution model that indicates locations relative to invasive annual grass abundance into classes of < 5%, 5-15%, 16-25%, 26-45%, and > 45% cover. Each component model was validated using held-out sample data, and relative accuracy was 86%, 74%, 62%, 62%, and 60%, respectively, with an overall kappa of 0.773. The Columbia Plateau, Northern Basin and Range, and Snake River Plain ecoregions appear to have the greatest overall proportions (48-62%) mapped within at least one of the invasive cover categories. Overlay of the resulting model with major vegetation types indicated > 50 major vegetation types that are affected by current distribution of annual grasses and are at risk of expansion. Among these, Intermountain Basins, Big Sagebrush Steppe, and Columbia Plateau Steppe and Grassland each consistently scored high for invasive risk where they occur. Spatial models of this type should assist with rangeland restoration and for decisions involving placement of infrastructure, vegetation treatments where further surface disturbance could trigger additional cheatgrass expansion. Options exist for extending this model, using climate projections over upcoming decades, to indicate areas of increasing risk for invasion. (C) 2019 The Society for Range Management. Published by Elsevier Inc. All rights reserved.
英文关键词	ecological condition ecological integrity human footprint human modification invasive annual grass weeds
类型	Article
语种	英语
国家	USA
收录类别	SCI-E
WOS记录号	WOS:000504332700018
WOS关键词	BROMUS-TECTORUM ; CHEATGRASS ; FIRE ; BASIN ; VEGETATION ; GROWTH ; PLANT ; DEMOGRAPHY ; DOMINANCE ; DYNAMICS
WOS类目	Ecology ; Environmental Sciences
WOS研究方向	Environmental Sciences & Ecology
EI主题词	2020-01-01
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/312004
作者单位	NatureServe, 1680 38th St,Suite 120, Boulder, CO 80301 USA
推荐引用方式 GB/T 7714	Hak, John C.,Comer, Patrick J.. Modeling Invasive Annual Grass Abundance in the Cold Desert Ecoregions of the Interior Western United States[J],2020,73(1):171-180.
APA	Hak, John C.,&Comer, Patrick J..(2020).Modeling Invasive Annual Grass Abundance in the Cold Desert Ecoregions of the Interior Western United States.RANGELAND ECOLOGY & MANAGEMENT,73(1),171-180.
MLA	Hak, John C.,et al."Modeling Invasive Annual Grass Abundance in the Cold Desert Ecoregions of the Interior Western United States".RANGELAND ECOLOGY & MANAGEMENT 73.1(2020):171-180.