气候变化领域集成服务门户(CCPortal): The role of vadose zone physics in the ecohydrological response of a Tibetan meadow to freeze-thaw cycles

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DOI	10.5194/tc-14-4653-2020
	The role of vadose zone physics in the ecohydrological response of a Tibetan meadow to freeze-thaw cycles
	Yu L.; Fatichi S.; Zeng Y.; Su Z.
发表日期	2020
ISSN	19940416
起始页码	4653
结束页码	4673
卷号	14 期号:12
英文摘要	The vadose zone is a zone sensitive to environmental changes and exerts a crucial control in ecosystem functioning and even more so in cold regions considering the rapid change in seasonally frozen ground under climate warming. While the way in representing the underlying physical process of the vadose zone differs among models, the effect of such differences on ecosystem functioning and its ecohydrological response to freeze-thaw cycles are seldom reported. Here, the detailed vadose zone process model STEMMUS (Simultaneous Transfer of Energy, Mass and Momentum in Unsaturated Soil) was coupled with the ecohydrological model Tethys-Chloris (T & C) to investigate the role of influential physical processes during freeze-thaw cycles. The physical representation is increased from using T & C coupling without STEMMUS enabling the simultaneous mass and energy transfer in the soil system (liquid, vapor, ice)-and with explicit consideration of the impact of soil ice content on energy and water transfer properties-to using T & C coupling with it. We tested model performance with the aid of a comprehensive observation dataset collected at a typical meadow ecosystem on the Tibetan Plateau. Results indicated that (i) explicitly considering the frozen soil process significantly improved the soil moisture/temperature profile simulations and facilitated our understanding of the water transfer processes within the soil-plant-atmosphere continuum; (ii) the difference among various representations of vadose zone physics have an impact on the vegetation dynamics mainly at the beginning of the growing season; and (iii) models with different vadose zone physics can predict similar interannual vegetation dynamics, as well as energy, water, and carbon exchanges, at the land surface. This research highlights the important role of vadose zone physics for ecosystem functioning in cold regions and can support the development and application of future Earth system models. © 2020 Author(s).
英文关键词	data set; ecohydrology; ecosystem function; freeze-thaw cycle; frozen ground; numerical model; vadose zone; warming; China; Qinghai-Xizang Plateau; Chloris; Tethys
语种	英语
来源期刊	Cryosphere
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/202259
作者单位	Faculty of Geo-information Science and Earth Observation (ITC), University of Twente, Enschede, Netherlands; Department of Civil and Environmental Engineering, National University of Singapore, Singapore, Singapore; Key Laboratory of Subsurface Hydrology and Ecological Effect in Arid Region, Ministry of Education, School of Water and Environment, Chang'an University, Xi'an, China
推荐引用方式 GB/T 7714	Yu L.,Fatichi S.,Zeng Y.,et al. The role of vadose zone physics in the ecohydrological response of a Tibetan meadow to freeze-thaw cycles[J],2020,14(12).
APA	Yu L.,Fatichi S.,Zeng Y.,&Su Z..(2020).The role of vadose zone physics in the ecohydrological response of a Tibetan meadow to freeze-thaw cycles.Cryosphere,14(12).
MLA	Yu L.,et al."The role of vadose zone physics in the ecohydrological response of a Tibetan meadow to freeze-thaw cycles".Cryosphere 14.12(2020).