干旱区生态环境知识资源中心(Arid): Hydrologic connectivity drives extremes and high variability in vegetation productivity across Australian arid and semi-arid ecosystems

Arid

DOI	10.1016/j.rse.2022.112937
	Hydrologic connectivity drives extremes and high variability in vegetation productivity across Australian arid and semi-arid ecosystems
	Norton, Alexander J.; Rayner, Peter J.; Wang, Ying-Ping; Parazoo, Nicholas C.; Baskaran, Latha; Briggs, Peter R.; Haverd, Vanessa; Doughty, Russell
通讯作者	Parazoo, NC
来源期刊	REMOTE SENSING OF ENVIRONMENT
ISSN	0034-4257
EISSN	1879-0704
出版年	2022
卷号	272
英文摘要	Vegetation growth drives many of the interactions between the land surface and atmosphere including the uptake of carbon through photosynthesis and loss of water through transpiration. In arid and semi-arid regions water is the dominant driver of vegetation growth. However, few studies consider the fact that water can move laterally across the landscape as runoff via streams and floodplains, termed hydrologic connectivity. Using multiple observations alongside models and a hydromorphology dataset for Australia, we examine how ecosystems with high hydrologic connectivity differ in their vegetation response to water availability, soil properties, and interannual variability and extremes in vegetation productivity. We find that the average interannual variability of vegetation productivity is 21-34% higher in ecosystems with high hydrologic connectivity, with skewed annual anomalies showing larger extremes in carbon uptake. This is driven by a higher average and more variable surface soil moisture and significantly higher soil available water capacity and soil depth. These spatially small ecosystems, covering 14% of the study region, contribute 15-22% (median = 17%) to regionalscale carbon uptake through higher rates of gross photosynthesis, especially evident during wet years, and 3-37% (median = 19%) to annual anomalies. Current global land surface models do not reproduce the observed spatial patterns of interannual variability in carbon uptake over regions where hydrologic connectivity is high as they lack the mechanism of connectivity of water between discrete land surface elements. This study highlights the significant role of riparian and floodplain vegetation on the interannual variability and extremes of the regional carbon cycle.
英文关键词	Ecohydrology Carbon cycle Photosynthesis Vegetation dynamics
类型	Article
语种	英语
开放获取类型	Bronze, Green Accepted
收录类别	SCI-E
WOS记录号	WOS:000759731300001
WOS关键词	LAKE EYRE BASIN ; TERRESTRIAL CARBON ; WATER AVAILABILITY ; SURFACE HYDROLOGY ; CLIMATE EXTREMES ; SUBSURFACE FLOW ; DATA-SETS ; SOIL ; INDEXES ; TRENDS
WOS类目	Environmental Sciences ; Remote Sensing ; Imaging Science & Photographic Technology
WOS研究方向	Environmental Sciences & Ecology ; Remote Sensing ; Imaging Science & Photographic Technology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/394260
推荐引用方式 GB/T 7714	Norton, Alexander J.,Rayner, Peter J.,Wang, Ying-Ping,et al. Hydrologic connectivity drives extremes and high variability in vegetation productivity across Australian arid and semi-arid ecosystems[J],2022,272.
APA	Norton, Alexander J..,Rayner, Peter J..,Wang, Ying-Ping.,Parazoo, Nicholas C..,Baskaran, Latha.,...&Doughty, Russell.(2022).Hydrologic connectivity drives extremes and high variability in vegetation productivity across Australian arid and semi-arid ecosystems.REMOTE SENSING OF ENVIRONMENT,272.
MLA	Norton, Alexander J.,et al."Hydrologic connectivity drives extremes and high variability in vegetation productivity across Australian arid and semi-arid ecosystems".REMOTE SENSING OF ENVIRONMENT 272(2022).