An interplay of soil salinization and groundwater degradation threatening coexistence of oasis-desert ecosystems

被引:36
|
作者
Yin, Xinwei [1 ,2 ]
Feng, Qi [1 ]
Li, Yan [3 ,4 ]
Deo, Ravinesh C. [5 ]
Liu, Wei [1 ]
Zhu, Meng [1 ]
Zheng, Xinjun [4 ,6 ]
Liu, Ran [4 ,6 ]
机构
[1] Chinese Acad Sci, Key Lab Ecohydrol Inland River Basin, Northwest Inst Environm & Resources, Lanzhou 730000, Peoples R China
[2] Univ Chinese Acad Sci, Beijing 100049, Peoples R China
[3] Zhejiang A&F Univ, State Key Lab Subtrop Silviculture, Hangzhou 311300, Peoples R China
[4] Chinese Acad Sci, Fukang Stn Desert Ecol, Fukang 831505, Xinjiang, Peoples R China
[5] Univ Southern Queensland, Sch Sci, Ctr Appl Climate Sci, Ctr Sustainable Agr Syst,Inst Life Sci & Environm, Springfield 4300, Australia
[6] Chinese Acad Sci, Xinjiang Inst Ecol & Geog, State Key Lab Desert & Oasis Ecol, Urumqi 830011, Peoples R China
基金
中国国家自然科学基金;
关键词
Oasis-desert ecosystems; Soil salinization; Groundwater dynamics; Interplay; Adaptive water-salt management; INLAND RIVER-BASINS; DRYLAND SALINITY; HEIHE RIVER; IRRIGATED AGRICULTURE; SURFACE-WATER; LAND-USE; EVOLUTION; RECHARGE; DYNAMICS; FLOW;
D O I
10.1016/j.scitotenv.2021.150599
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
In salt-affected and groundwater-fed oasis-desert systems, water and salt balance is critically important for stable coexistence of oasis-desert ecosystems, especially in the context of anthropogenic-induced over-development and perturbations due to climate variability that affects the sustainability of human-natural systems. Here, an investigation of the spatio-temporal variability of soil salinity and groundwater dynamics across four different hydrological regions in oasis-desert system is performed. An evaluation of the effects of soil salinization and groundwater degradation interplays on the coexistence of oasis-desert ecosystems in northwestern China is undertaken over 1995-2020, utilizing comprehensive measurements and ecohydrological modelling framework. We note that the process of salt migration and accumulation across different landscapes in oasis-desert system is reshaping, with soil salinization accelerating especially in water-saving agricultural irrigated lands. The continuous decline in groundwater tables, dramatic shifts in groundwater flow patterns and significant degradation of groundwater quality are occurring throughout the watershed. Worse so, a clear temporal-spatial relationship between soil salinization and groundwater degradation appearing to exacerbate the regional water-salt imbalance. Also, the eco-environmental flows are reaching to their limit with watershed closures, although these progressions were largely hidden by regional precipitation and streamflow variability. The oasis-desert ecosystems tend to display bistable dynamics with two preferential configurations of bare and vegetated soils, and soil salinization and groundwater degradation interplays are causing catastrophic shift in the oasis-desert ecosystems. The results highlight the importance of regional adaptive water and salt management to maintain the coexistence of oasis-desert ecosystems in arid areas. (c) 2021 Elsevier B.V. All rights reserved.
引用
收藏
页数:20
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