气候变化领域集成服务门户(CCPortal): Relevance of near-surface soil moisture vs. terrestrial water storage for global vegetation functioning

CCPortal

DOI	10.5194/bg-21-1533-2024
	Relevance of near-surface soil moisture vs. terrestrial water storage for global vegetation functioning
	Khanal, Prajwal; Van Dijke, Anne J. Hoek; Schaffhauser, Timo; Li, Wantong; Paulus, Sinikka J.; Zhan, Chunhui; Orth, Rene
发表日期	2024
ISSN	1726-4170
EISSN	1726-4189
起始页码	21
结束页码	6
卷号	21 期号:6
英文摘要	Soil water availability is an essential prerequisite for vegetation functioning. Vegetation takes up water from varying soil depths depending on the characteristics of its rooting system and soil moisture availability across depth. The depth of vegetation water uptake is largely unknown across large spatial scales as a consequence of sparse ground measurements. At the same time, emerging satellite-derived observations of vegetation functioning, surface soil moisture, and terrestrial water storage present an opportunity to assess the depth of vegetation water uptake globally. In this study, we characterize vegetation functioning through the near-infrared reflectance of vegetation (NIRv) and compare its relation to (i) near-surface soil moisture from the ESA's Climate Change Initiative (CCI) and (ii) total water storage from the Gravity Recovery and Climate Experiment (GRACE) mission at a monthly timescale during the growing season. The relationships are quantified through partial correlations to mitigate the influence of confounding factors such as energy- and other water-related variables. We find that vegetation functioning is generally more strongly related to near-surface soil moisture, particularly in semi-arid regions and areas with low tree cover. In contrast, in regions with high tree cover and in arid regions, the correlation with terrestrial water storage is comparable to or even higher than that of near-surface soil moisture, indicating that trees can and do make use of their deeper rooting systems to access deeper soil moisture, similar to vegetation in arid regions. At the same time, we note that this comparison is hampered by different noise levels in these satellite data streams. In line with this, an attribution analysis that examines the relative importance of soil water storage for vegetation reveals that they are controlled by (i) water availability influenced by the climate and (ii) vegetation type reflecting adaptation of the ecosystems to local water resources. Next to variations in space, the vegetation water uptake depth also varies in time. During dry periods, the relative importance of terrestrial water storage increases, highlighting the relevance of deeper water resources during rain-scarce periods. Overall, the synergistic exploitation of state-of-the-art satellite data products to disentangle the relevance of near-surface vs. terrestrial water storage for vegetation functioning can inform the representation of vegetation-water interactions in land surface models to support more accurate climate change projections.
语种	英语
WOS研究方向	Environmental Sciences & Ecology ; Geology
WOS类目	Ecology ; Geosciences, Multidisciplinary
WOS记录号	WOS:001190615600001
来源期刊	BIOGEOSCIENCES
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/291584
作者单位	Max Planck Society; Technical University of Munich; University of Twente; Friedrich Schiller University of Jena; University of Freiburg; Technical University of Munich
推荐引用方式 GB/T 7714	Khanal, Prajwal,Van Dijke, Anne J. Hoek,Schaffhauser, Timo,et al. Relevance of near-surface soil moisture vs. terrestrial water storage for global vegetation functioning[J],2024,21(6).
APA	Khanal, Prajwal.,Van Dijke, Anne J. Hoek.,Schaffhauser, Timo.,Li, Wantong.,Paulus, Sinikka J..,...&Orth, Rene.(2024).Relevance of near-surface soil moisture vs. terrestrial water storage for global vegetation functioning.BIOGEOSCIENCES,21(6).
MLA	Khanal, Prajwal,et al."Relevance of near-surface soil moisture vs. terrestrial water storage for global vegetation functioning".BIOGEOSCIENCES 21.6(2024).