气候变化领域集成服务门户(CCPortal): Using water stable isotopes to understand evaporation; moisture stress; and re-wetting in catchment forest and grassland soils of the summer drought of 2018

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DOI	10.5194/hess-24-3737-2020
	Using water stable isotopes to understand evaporation; moisture stress; and re-wetting in catchment forest and grassland soils of the summer drought of 2018
	Kleine L.; Tetzlaff D.; Smith A.; Wang H.; Soulsby C.
发表日期	2020
ISSN	1027-5606
起始页码	3737
结束页码	3752
卷号	24 期号:7
英文摘要	In drought-sensitive lowland catchments, ecohydrological feedbacks to climatic anomalies can give valuable insights into ecosystem functioning in the context of alarming climate change projections. However, the dynamic influences of vegetation on spatio-temporal processes in water cycling in the critical zone of catchments are not yet fully understood. We used water stable isotopes to investigate the impacts of the 2018 drought on dominant soil-vegetation units of the mixed land use Demnitz Millcreek (DMC, north-eastern Germany) catchment (66 km2). The isotope sampling was carried out in conjunction with hydroclimatic, soil, groundwater, and vegetation monitoring. Drying soils, falling groundwater levels, cessation of streamflow, and reduced crop yields demonstrated the failure of catchment water storage to support "blue"(groundwater recharge and stream discharge) and "green"(evapotranspiration) water fluxes. We further conducted monthly bulk soil water isotope sampling to assess the spatio-temporal dynamics of water soil storage under forest and grassland vegetation. Forest soils were drier than the grassland, mainly due to higher interception and transpiration losses. However, the forest soils also had more freely draining shallow layers and were dominated by rapid young (age < 2 months) water fluxes after rainfall events. The grassland soils were more retentive and dominated by older water (age > 2 months), though the lack of deep percolation produced water ages > 1 year under forest. We found the displacement of any "drought signal"within the soil profile limited to the isotopic signatures and no displacement or "memory effect"in d-excess over the monthly time step, indicating rapid mixing of new rainfall. Our findings suggest that contrasting soil-vegetation communities have distinct impacts on ecohydrological partitioning and water ages in the sub-surface. Such insights will be invaluable for developing sustainable land management strategies appropriate to water availability and building resilience to climate change. © 2020 Author(s).
语种	英语
scopus关键词	Catchments; Climate change; Drought; Evapotranspiration; Forestry; Isotopes; Land use; Rain; Runoff; Soil moisture; Solvents; Vegetation; Water supply; Climate change projections; Ecosystem functioning; Ground water recharge; North-eastern germany; Spatio-temporal dynamics; Sustainable land managements; Vegetation monitoring; Water stable isotopes; Recharging (underground waters); catchment; climate change; climate effect; climate prediction; drought; ecohydrology; ecosystem function; evaporation; forest soil; hydrological cycle; moisture content; percolation; sampling; soil water; spatiotemporal analysis; water availability; water level; water storage; Germany
来源期刊	Hydrology and Earth System Sciences
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/159344
作者单位	Kleine, L., Department of Geography, Humboldt-Universität zu Berlin, Rudower Chaussee 16, Berlin, 12489, Germany, Department of Ecohydrology, Leibniz Institute of Freshwater Ecology and Inland Fisheries, Müggelseedamm 310, Berlin, 12587, Germany; Tetzlaff, D., Department of Geography, Humboldt-Universität zu Berlin, Rudower Chaussee 16, Berlin, 12489, Germany, Department of Ecohydrology, Leibniz Institute of Freshwater Ecology and Inland Fisheries, Müggelseedamm 310, Berlin, 12587, Germany; Smith, A., Department of Ecohydrology, Leibniz Institute of Freshwater Ecology and Inland Fisheries, Müggelseedamm 310, Berlin, 12587, Germany; Wang, H., School of Civil Engineering, Sun Yat-sen University, 135 Xin'gang Xi Road, Guangzhou, 510275, China; Soulsby, C., Department of Ecohydrology, Leibniz Institute of Freshwater Ecology and Inland Fisheries, Müggelseedamm 310, Berlin, 12587, Germany, Northern Rivers Institute, University of Aberdeen, St. Mary's Building, Kings College, Old Aberdeen, AB24 3UE, United Kingdom
推荐引用方式 GB/T 7714	Kleine L.,Tetzlaff D.,Smith A.,et al. Using water stable isotopes to understand evaporation; moisture stress; and re-wetting in catchment forest and grassland soils of the summer drought of 2018[J],2020,24(7).
APA	Kleine L.,Tetzlaff D.,Smith A.,Wang H.,&Soulsby C..(2020).Using water stable isotopes to understand evaporation; moisture stress; and re-wetting in catchment forest and grassland soils of the summer drought of 2018.Hydrology and Earth System Sciences,24(7).
MLA	Kleine L.,et al."Using water stable isotopes to understand evaporation; moisture stress; and re-wetting in catchment forest and grassland soils of the summer drought of 2018".Hydrology and Earth System Sciences 24.7(2020).