干旱区生态环境知识资源中心(Arid): Global Mapping of Potential and Climatic Plant-Available Soil Water

Arid

DOI	10.1029/2022MS003277
	Global Mapping of Potential and Climatic Plant-Available Soil Water
	Gupta, Surya; Lehmann, Peter; Bickel, Samuel; Bonetti, Sara; Or, Dani
通讯作者	Gupta, S
来源期刊	JOURNAL OF ADVANCES IN MODELING EARTH SYSTEMS
EISSN	1942-2466
出版年	2023
卷号	15 期号:11
英文摘要	The estimation of plant-available soil water (PASW) is essential to quantify transpiration fluxes, the onset of heatwaves, irrigation water management, land-use decisions, vegetation ecology, and land surface memory in climate models. PASW is the amount of stored water available for plant use. It is broadly defined as the difference between soil water content at field capacity (FC) and wilting point (WP) in the root zone. The limiting states of FC and WP are linked to gravitational drainage and plant physiology and are often deduced from soil water characteristics at prescribed matric potentials (-3.3 and -150 m for FC and WP, respectively). Evidence suggests that static definition of FC at a constant matric potential ignores dynamic effects on FC attainment affected by soil and climate. Here, we revise the definition of PASW by considering (a) soil-specific dynamic effects and (b) local climate effects of evaporation and rainfall frequency on PASW. The new global PASW maps benefit from state-of-the-art soil maps, water characteristic parameterization, and incorporation of dynamic definition of FC. For completeness we provide static and dynamic PASW estimates. Globally, ice-free soils store up to 19,941 km(3) of water in the top 1 m (representing 18% of annual terrestrial precipitation). Adjusted for local climatic conditions, global PASW storage rarely exceeds 14,853 km(3) per year highlighting the need for multiple refilling of soil profiles. Differences between potential and climatic PASW are manifested primarily in arid regions (where soil profiles are rarely filled to capacity) whereas in humid regions differences in PASW storage are minor.
英文关键词	soil water characteristics curves field capacity climate effects arid and humid regions irrigation water management
类型	Article
语种	英语
开放获取类型	Green Published, gold
收录类别	SCI-E
WOS记录号	WOS:001098439400001
WOS关键词	FIELD-CAPACITY ; HYDRAULIC CONDUCTIVITY ; MODEL ; RETENTION
WOS类目	Meteorology & Atmospheric Sciences
WOS研究方向	Meteorology & Atmospheric Sciences
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/397095
推荐引用方式 GB/T 7714	Gupta, Surya,Lehmann, Peter,Bickel, Samuel,et al. Global Mapping of Potential and Climatic Plant-Available Soil Water[J],2023,15(11).
APA	Gupta, Surya,Lehmann, Peter,Bickel, Samuel,Bonetti, Sara,&Or, Dani.(2023).Global Mapping of Potential and Climatic Plant-Available Soil Water.JOURNAL OF ADVANCES IN MODELING EARTH SYSTEMS,15(11).
MLA	Gupta, Surya,et al."Global Mapping of Potential and Climatic Plant-Available Soil Water".JOURNAL OF ADVANCES IN MODELING EARTH SYSTEMS 15.11(2023).