干旱区生态环境知识资源中心(Arid): Ecologically relevant moisture and temperature metrics for assessing dryland ecosystem dynamics

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DOI	10.1002/eco.2509
	Ecologically relevant moisture and temperature metrics for assessing dryland ecosystem dynamics
	Chenoweth, Damaris A.; Schlaepfer, Daniel R.; Chambers, Jeanne C.; Brown, Jessi L.; Urza, Alexandra K.; Hanberry, Brice; Board, David; Crist, Michele; Bradford, John B.
通讯作者	Chenoweth, DA
来源期刊	ECOHYDROLOGY
ISSN	1936-0584
EISSN	1936-0592
出版年	2023
卷号	16 期号:3
英文摘要	In drylands, water-limited regions that cover similar to 40% of the global land surface, ecosystems are primarily controlled by access to soil moisture and exposure to simultaneously hot and dry conditions. Quantifying ecologically relevant environmental metrics is difficult in drylands because the response of vegetation to moisture and temperature conditions is not easily explained solely by climate-based metrics. To address this knowledge gap, we developed and examined 27 climate and ecological drought metrics across dryland areas of the western United States. Included in the 27 metrics is a suite of 19 largely new ecological drought metrics that are designed to quantify multiple aspects of environmental limitation in drylands, including overall growing conditions, seasonal fluctuations, seasonal moisture timing, exposure to extreme drought and recruitment potential for perennial plants. To quantify these metrics, we simulated water balance pools and fluxes of daily soil moisture at multiple depths with historical weather from 1970 to 2010 using the SOILWAT2 ecosystem water balance model. We assessed the relationships among these metrics and their spatial and temporal patterns. We found that the inclusion of ecological drought metrics substantially increased the dimensionality of the climate metrics dataset; the number of independent variables needed to explain 90% of the variance in the dataset increased with the addition of ecological drought metrics. Spatial patterns in overall growing conditions represented well-known differences among ecoregions, for example, high temperatures and low precipitation in the southwest and cool temperatures and greater precipitation in the northeast. Seasonal fluctuation in soil water availability (SWA) was greatest in the southwest (Mojave Desert), whereas fluctuation in climatic water deficit (CWD) was greatest in the northwest (northern Great Basin and Columbia Plateau). Seasonal timing of moisture also differed among metrics; the timing of wet degree days (WDD), the timing of SWA and the timing of CWD were only weakly related to seasonal timing of precipitation. Plant recruitment metrics varied strongly across western drylands. In the Great Plains, recruitment events occurred more frequently and lasted longer than in the intermountain regions, where recruitment events were comparatively rare and short. These ecological drought metrics provide new insight into patterns of soil moisture and temperature that shape the structure and function of dryland ecosystems. The metrics will be useful for assessing the potential impact of climate change on dryland ecosystems and developing adaptive resource management strategies to sustain dryland ecosystem services in a changing world.
英文关键词	dryland vegetation ecological drought hot drought plant recruitment soil moisture
类型	Article
语种	英语
开放获取类型	Bronze
收录类别	SCI-E
WOS记录号	WOS:000892043300001
WOS关键词	SOIL-WATER ; PLANT-COMMUNITIES ; GREAT-BASIN ; LAND-USE ; DIE-OFF ; VEGETATION ; ECOHYDROLOGY ; DESERT ; DESERTIFICATION ; DISTURBANCE
WOS类目	Ecology ; Environmental Sciences ; Water Resources
WOS研究方向	Environmental Sciences & Ecology ; Water Resources
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/395891
推荐引用方式 GB/T 7714	Chenoweth, Damaris A.,Schlaepfer, Daniel R.,Chambers, Jeanne C.,et al. Ecologically relevant moisture and temperature metrics for assessing dryland ecosystem dynamics[J],2023,16(3).
APA	Chenoweth, Damaris A..,Schlaepfer, Daniel R..,Chambers, Jeanne C..,Brown, Jessi L..,Urza, Alexandra K..,...&Bradford, John B..(2023).Ecologically relevant moisture and temperature metrics for assessing dryland ecosystem dynamics.ECOHYDROLOGY,16(3).
MLA	Chenoweth, Damaris A.,et al."Ecologically relevant moisture and temperature metrics for assessing dryland ecosystem dynamics".ECOHYDROLOGY 16.3(2023).