NDLI: Evaluating flood inundation impact on wetland vegetation FPAR of the Macquarie Marshes, Australia

Content Provider	Springer Nature Link
Author	Wang, Bing Chen, Yun Lü, Changwei
Copyright Year	2015
Abstract	Vegetation is a key measure of changes in wetland hydrology and ecology induced by flood inundation. The fraction of photosynthetically active radiation absorbed by the canopy (FPAR) is an indicator of presence and state of vegetation, which can be estimated from remote sensing data. This study investigates the spatio-temporal variations of FPAR under inundation by integrating remotely sensed images and hydrological data in a GIS environment. Taking the Macquarie Marshes as a study area, it aims to model the behavior of vegetation after an ecologically significant flood using Moderate Resolution Imaging Spectroradiometer (MODIS) FPAR products, so as to reveal the impacts of flood on wetland vegetation. Flow data from four gauging stations at upstream, mid-stream and downstream were analysed. The modified Normalized Difference Water Index (mNDWI) was used to extract inundation extent from MODIS images. Image ratio and lagged cross-correlation methods were employed to disclose the vegetation response to flooding. Vegetation in the Marshes went through considerable structural changes during the identified flood event. FPAR was relatively more stable in the inundated areas than the non-inundated areas. FPAR values in both inundated and non-inundated areas exhibited a similar trend in the “non-flood period”, but a different trend in the “flood period”. Lagged cross-correlation analysis shows diverse vegetation responses to flood inundation between the inundated and non-inundated areas. It proves the water retention of wetland inundation and confirms vegetation in the non-inundated areas more sensitive to soil moisture conditions. This study proposes a feasible method for efficiently studying vegetation dynamics of flood inundation at both spatial and temporal scales. These methodology and results can provide baseline information for eco-hydrological studies of floodplain-wetland ecosystems.
Starting Page	4989
Ending Page	5000
Page Count	12
File Format	PDF
ISSN	18666280
Journal	Environmental Earth Sciences
Volume Number	74
Issue Number	6
e-ISSN	18666299
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2015-05-20
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Wetland Flow MODIS FPAR mNDWI Spatio-temporal variations Geology Hydrology/Water Resources Geochemistry Environmental Science and Engineering Terrestrial Pollution Biogeosciences
Content Type	Text
Resource Type	Article
Subject	Global and Planetary Change Earth-Surface Processes Soil Science Environmental Chemistry Pollution Geology Water Science and Technology

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