Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 501740
Title A multi-scale approach to assess the effect of groundwater extraction on Prosopis tamarugo in the Atacama Desert
Author(s) Decuyper, M.; Chávez Oyanadel, R.O.; Copini, P.; Sass-Klaassen, U.G.W.
Source Journal of Arid Environments 131 (2016). - ISSN 0140-1963 - p. 25 - 34.
Department(s) Laboratory of Geo-information Science and Remote Sensing
Alterra - Vegetation, forest and landscape ecology
Forest Ecology and Forest Management
Publication type Refereed Article in a scientific journal
Publication year 2016
Abstract Groundwater-dependent ecosystems occur in arid and semi-arid areas worldwide and are sensitive to changes in groundwater availability. Prosopis tamarugo Phil, endemic to the Atacama Desert, is threatened by groundwater overexploitation due to mining and urban consumption. The effect of groundwater depletion on two representative sites (low -and high-depletion) was studied using a multi-scale approach, combining remote sensing based estimations of canopy growth and water condition, and tree-ring based analysis of stem growth. On the stand level two NDVI (Normalized Difference Vegetation Index) -derived parameters: NDVI in winter and the difference between NDVI in summer and winter showed significant negative trends in the high-depletion site, indicating drought stress. Radial stem growth of viable P. tamarugo trees was 48% lower in the high-depletion site. At the tree level, the Green Canopy Fraction (GCF) also indicated drought stress since a larger percentage of trees fell within lower GCF classes. Groundwater depletion of 3 m, reaching a groundwater depth of >10 m, increased drought stress, and led to reduced growth in viable trees. Viable trees may be able to adapt to the drop in groundwater levels by increasing root growth, whereas for non-viable trees, the effects might be detrimental. © 2016 Elsevier Ltd. All rights reserved.
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