Journal cover Journal topic
Hydrology and Earth System Sciences An interactive open-access journal of the European Geosciences Union
Hydrol. Earth Syst. Sci., 21, 4469-4478, 2017
https://doi.org/10.5194/hess-21-4469-2017
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.
Research article
08 Sep 2017
Large-scale vegetation responses to terrestrial moisture storage changes
Robert L. Andrew1, Huade Guan1,2, and Okke Batelaan1,2 1School of the Environment, Flinders University, Bedford Park, 5042, Australia
2National Centre for Groundwater Research and Training, Bedford Park, 5042, Australia
Abstract. The normalised difference vegetation index (NDVI) is a useful tool for studying vegetation activity and ecosystem performance at a large spatial scale. In this study we use the Gravity Recovery and Climate Experiment (GRACE) total water storage (TWS) estimates to examine temporal variability of the NDVI across Australia. We aim to demonstrate a new method that reveals the moisture dependence of vegetation cover at different temporal resolutions. Time series of monthly GRACE TWS anomalies are decomposed into different temporal frequencies using a discrete wavelet transform and analysed against time series of the NDVI anomalies in a stepwise regression. The results show that combinations of different frequencies of decomposed GRACE TWS data explain NDVI temporal variations better than raw GRACE TWS alone. Generally, the NDVI appears to be more sensitive to interannual changes in water storage than shorter changes, though grassland-dominated areas are sensitive to higher-frequencies of water-storage changes. Different types of vegetation, defined by areas of land use type, show distinct differences in how they respond to the changes in water storage, which is generally consistent with our physical understanding. This unique method provides useful insight into how the NDVI is affected by changes in water storage at different temporal scales across land use types.

Citation: Andrew, R. L., Guan, H., and Batelaan, O.: Large-scale vegetation responses to terrestrial moisture storage changes, Hydrol. Earth Syst. Sci., 21, 4469-4478, https://doi.org/10.5194/hess-21-4469-2017, 2017.
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Short summary
In this study we statistically analyse the relationship between vegetation cover and components of total water storage. Splitting water storage into different components allows for a more comprehensive understanding of the temporal response of vegetation to changes in water storage. Generally, vegetation appears to be more sensitive to interannual changes in water storage than to shorter changes, though this varies in different land use types.
In this study we statistically analyse the relationship between vegetation cover and components...
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