Ecological drought and its state assessment: a case study in the Yellow River estuary

Water cycle has been intensified by global warming, leading to frequent extreme climate events. Drought is an extreme climate phenomenon. Runoff decrease and human water demand increase aggravate the water shortage of regional ecosystems, affecting regional water and land ecosystems and causing ecol...

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Published in:Journal of water and climate change 2022-01, Vol.13 (1), p.13-25
Main Authors: Zhang, Jinliang, Liu, Bojun, Yang, Libin, He, Liyuan, Cao, Xinyi, Shao, Guangwen
Format: Article
Language:English
Subjects:
Agricultural production
Aquatic ecosystems
Biodiversity
Climate
Climate change
Climatic extremes
concept redefinition
Disasters
Drought
Drought index
ecological drought
Ecological effects
Ecosystems
Estuaries
Estuarine dynamics
Evaluation
Global warming
Hydrologic cycle
Hydrological cycle
Hydrology
leading indicators
Plant cover
River discharge
River ecology
River flow
River runoff
Rivers
Runoff
Runoff decrease
state assessment
Vegetation
Water demand
Water pollution
Water quality
Water shortages
Wetlands
yellow river estuary
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description Water cycle has been intensified by global warming, leading to frequent extreme climate events. Drought is an extreme climate phenomenon. Runoff decrease and human water demand increase aggravate the water shortage of regional ecosystems, affecting regional water and land ecosystems and causing ecological drought, river cutoff and water pollution. Finally, the reverse succession and the imbalance of regional ecological structures take place. The clarification of the concept of ecological drought for effective evaluation of regional ecological drought degree has become an urgent important scientific issue to be resolved. Therefore, in this paper, the typical region of the Yellow River estuary was studied for the analysis of characteristics of regional ecological changes and the definition of the concept and connotation of ecological drought. Based on the representative monitoring and early warning indices to ecological drought, the evaluation method and the classification standard of regional ecological drought were proposed. The regional ecological drought includes four levels: I (Severe), II (General), III (Weak) and IV (None). The indicator thresholds of river runoff, biodiversity and vegetation coverage on different ecological drought levels were quantified. The research results can be technically beneficial for the improvement of global ecological drought emergent support capacity and reducing loss due to drought.
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subjects Agricultural production
Aquatic ecosystems
Biodiversity
Climate
Climate change
Climatic extremes
concept redefinition
Disasters
Drought
Drought index
ecological drought
Ecological effects
Ecosystems
Estuaries
Estuarine dynamics
Evaluation
Global warming
Hydrologic cycle
Hydrological cycle
Hydrology
leading indicators
Plant cover
River discharge
River ecology
River flow
River runoff
Rivers
Runoff
Runoff decrease
state assessment
Vegetation
Water demand
Water pollution
Water quality
Water shortages
Wetlands
yellow river estuary
title Ecological drought and its state assessment: a case study in the Yellow River estuary
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