Severe depletion of soil moisture following land-use changes for ecological restoration: Evidence from northern China

2016 ◽  
Vol 366 ◽  
pp. 1-10 ◽  
Author(s):  
Lei Deng ◽  
Weiming Yan ◽  
Yongwang Zhang ◽  
Zhouping Shangguan
Keyword(s):  
Land Use ◽  
Soil Moisture ◽  
Ecological Restoration ◽  
Land Use Changes ◽  
Northern China

Modelling the Hydrologic Regime of Arid Inland Wetlands: Non-linear Relationship Between Root-uptakes of Water and Underground Water Table

2021 ◽  
Author(s):  
Lin Li ◽  
Hu Liu ◽  
Yang Yu ◽  
Wenzhi Zhao
Keyword(s):  
Climate Change ◽  
Land Use ◽  
Soil Moisture ◽  
Water Table ◽  
Land Use Changes ◽  
Northwestern China ◽  
Wetland Ecosystem ◽  
Soil Moisture Dynamics ◽  
Inland Wetlands ◽  
Moisture Dynamics

<p><strong>Abstract: </strong>Wetlands remaining in the arid inland river landscapes of northwestern China suffer degradation and their resilience and ability to continue functioning under hydrologic and land use changes resulting from climate change may be significantly inhibited. Information on the desert-oasis wetlands, however, is sparse and knowledge of how ecological functioning and resilience may change under climate change and water-resource management is still lacking. Research in oasis wetland areas of the Northwestern China identified linkages between subsurface flow, plant transpiration, and water levels. In this study, we present an ecohydrological analysis of the energy and water balance in the wetland ecosystem. A process-based stochastic soil moisture model developed for groundwater-dependent ecosystems was employed to modelling the interactions between rainfall, water table fluctuations, soil moisture dynamics, and vegetation, and to investigate the ecohydrology of arid inland wetlands system. Field measured groundwater levels, vertical soil moisture profiles, soil water potentials, and root biomass allocation and transpiration of pioneer species in the wetlands were used to calibrate and validate the stochastic model. The parameterized model was then running to simulate the probability distributions of soil moisture and root water uptake, and quantitative descript the vegetation–water table–soil moisture interplay in the hypothesized scenarios of future. Our analysis suggested the increasing rates of water extraction and regulation of hydrologic processes, coupled with destruction of natural vegetation, and climate change, are jeopardizing the future persistence of wetlands and the ecological and socio-economic functions they support. To understand how climate change will impact on the ecohydrological functioning of wetlands, both hydrological and land use changes need to be considered in future works.</p><p><strong>Keywords: </strong>Wetland ecosystem, groundwater, soil moisture dynamics, water balances, Heihe River Basin</p>

Consistent functional response of meadow species and communities to land-use changes across productivity and soil moisture gradients

2016 ◽  
Vol 19 (2) ◽  
pp. 196-205 ◽  
Author(s):  
Maria Májeková ◽  
Štěpán Janeček ◽  
Ondřej Mudrák ◽  
Jan Horník ◽  
Petra Janečková ◽  
...  
Keyword(s):  
Land Use ◽  
Soil Moisture ◽  
Functional Response ◽  
Land Use Changes ◽  
Meadow Species

scholarly journals Water Balance and Soil Moisture Deficit of Different Vegetation Units under Semiarid Conditions in the Andes of Southern Ecuador

Climate ◽  
2020 ◽  
Vol 8 (2) ◽  
pp. 30 ◽  
Author(s):  
Andreas Fries ◽  
Karen Silva ◽  
Franz Pucha-Cofrep ◽  
Fernando Oñate-Valdivieso ◽  
Pablo Ochoa-Cueva
Keyword(s):  
Land Use ◽  
Soil Moisture ◽  
Land Use Changes ◽  
Soil Samples ◽  
Soil Moisture Deficit ◽  
Climate Conditions ◽  
The Andes ◽  
Moisture Deficit ◽  
Southern Ecuador ◽  
Semiarid Conditions

Water availability in semiarid regions is endangered, which is not only due to changing climate conditions, but also to anthropogenic land use changes. The present study analyzed the annual and monthly water balance (WBc) and the soil moisture deficit (Ds) for different vegetation units under semiarid conditions in the Andes of southern Ecuador, based on limited meteorological station data and field measurements (soil samples). To calculate crop evapotranspiration (ETc) the Blaney–Criddle method was applied, and the specific crop factor (Kc) included, because only temperature (T) and precipitation (P) data were available. By means of the soil samples the water retention capacity (RC) of the different soil types present in the study area were estimated, which, in combination with WBc, provided reliable results respective to water surpluses or deficits for the different vegetation units. The results indicated highest Ds for cultivated areas, particularly for corn and sugarcane plantations, where annual deficits up to −1377.5 mm ha−1 and monthly deficits up to −181.1 mm ha−1 were calculated. Natural vegetation cover (scrubland, forest and paramo), especially at higher elevations, did not show any deficit throughout the year (annual surpluses up to 1279.6 mm ha−1; monthly surpluses up to 280.1 mm ha−1). Hence, it could be concluded that the prevailing climate conditions in semiarid regions cannot provide the necessary water for agricultural practices, for which reason irrigation is required. The necessary water can be supplied by areas coved by natural vegetation, but these areas are endangered due to population growth and the associated land use changes.

scholarly journals Variability of moisture recycling using a precipitationshed framework

2014 ◽  
Vol 11 (5) ◽  
pp. 5143-5178 ◽  
Author(s):  
P. W. Keys ◽  
E. A. Barnes ◽  
R. J. van der Ent ◽  
L. J. Gordon
Keyword(s):  
Land Use ◽  
Land Surface ◽  
Transport Model ◽  
Land Use Changes ◽  
Growing Season ◽  
Northern China ◽  
Atmospheric Moisture ◽  
Moisture Recycling ◽  
The Core ◽  
Western Sahel

Abstract. Recent research has revealed that upwind land-use changes can significantly influence downwind precipitation. The precipitationshed (the upwind ocean and land surface that contributes evaporation to a specific location's precipitation) may provide a boundary for coordination and governance of these upwind-downwind water linkages. We aim to quantify the variability of the precipitationshed boundary to determine whether there are persistent and significant sources of evaporation for a given region's precipitation. We identify the precipitationsheds for three regions (i.e. Western Sahel, Northern China, and La Plata) by tracking atmospheric moisture with a numerical water transport model (WAM-2layers) using gridded fields from both the ERA-Interim and MERRA reanalyses. Precipitationshed variability is examined first by diagnosing the persistence of the evaporation contribution and second with an analysis of the spatial variability of the evaporation contribution. The analysis leads to three key conclusions: (1) a core precipitationshed exists; (2) most of the variance in the precipitationshed is explained by a pulsing of more or less evaporation from the core precipitationshed; and, (3) the reanalysis datasets agree reasonably well, although the degree of agreement is regionally dependent. Given that much of the growing season evaporation arises from within a core precipitationshed that is largely persistent in time, we conclude that the precipitationshed can potentially provide a useful boundary for governing land-use change on downwind precipitation.

Land Use Changes of an Aeolian-Loessial Soil Area in Northwest China: Implications for Ecological Restoration

Pedosphere ◽  
2009 ◽  
Vol 19 (3) ◽  
pp. 356-361 ◽  
Author(s):  
Yu-Fu CHEN ◽  
Yan-Sui LIU ◽  
Jing WANG ◽  
Jian-Ping YAN ◽  
Xu-Dong GUO
Keyword(s):  
Land Use ◽  
Ecological Restoration ◽  
Land Use Changes ◽  
Northwest China ◽  
Loessial Soil ◽  
Soil Area
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