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Groundwater-surface Water Interactions, Vegetation Dependencies and Implications for Water Resources Management in the Semi-arid Hailiutu River Catchment, China – a Synthesis : Volume 9, Issue 11 (29/11/2012)

By Zhou, Y.

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Book Id: WPLBN0004013172
Format Type: PDF Article :
File Size: Pages 40
Reproduction Date: 2015

Title: Groundwater-surface Water Interactions, Vegetation Dependencies and Implications for Water Resources Management in the Semi-arid Hailiutu River Catchment, China – a Synthesis : Volume 9, Issue 11 (29/11/2012)  
Author: Zhou, Y.
Volume: Vol. 9, Issue 11
Language: English
Subject: Science, Hydrology, Earth
Collections: Periodicals: Journal and Magazine Collection, Copernicus GmbH
Historic
Publication Date:
2012
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

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Yin, L., Yang, Z., Hou, L., Huang, J., Zhou, Y., Uhlenbrook, S.,...Zhang, D. (2012). Groundwater-surface Water Interactions, Vegetation Dependencies and Implications for Water Resources Management in the Semi-arid Hailiutu River Catchment, China – a Synthesis : Volume 9, Issue 11 (29/11/2012). Retrieved from http://hawaiilibrary.net/


Description
Description: UNSCO-IHE Institute for Water Education, P.O. Box 3015, 2601 DA, Delft, The Netherlands. During the last decades, large scale land use changes took place in the Hailiutu River catchment, a semi-arid area in northwest China. These changes had significant impacts on the water resources in the area. Insights into groundwater and surface water interactions and vegetation-water dependencies help to understand these impacts and formulate sustainable water resources management policies. In this study, groundwater and surface water interactions were identified using the baseflow index at the catchment scale, and hydraulic and temperature methods as well as event hydrograph separation techniques at the sub-catchment scale. The results show that almost 88% of the river discharge consists of groundwater. Vegetation dependencies on groundwater were analyzed from the relationship between the Normalized Difference Vegetation Index (NDVI) and groundwater depth at the catchment scale and along an ecohydrogeological cross-section, and by measuring the sap flow of different plants, soil water contents and groundwater levels at different research sites. The results show that all vegetation types, i.e. trees (willow (Salix matsudana) and poplar (Populus simonii)), bushes (salix (Salix psammophila)) and agricultural crops (maize (Zea mays)), depend on groundwater as the dominant water source for transpiration. The comparative analysis indicates that maize crops use the largest amount of water, followed by poplar trees, salix bushes, and willow trees. For sustainable water use with the objective of satisfying water demand for socio-economical development and to prevent desertification, more water use efficient crops such as sorghum, barley and millet should be promoted to reduce the consumptive water use for irrigation. Willow trees should be used as wind-breaks in croplands and along roads, and dry resistant and less water use intensive plants (for instance native bushes) should be used to vegetate sand dunes.

Summary
Groundwater-surface water interactions, vegetation dependencies and implications for water resources management in the semi-arid Hailiutu River catchment, China – A synthesis

Excerpt
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