Can a vegetation index derived from remote sensing be indicative of areal transpiration?

Research output: Contribution to journalArticle

23 Citations (Scopus)

Abstract

Monthly, maximum-value-composited normalized difference vegetation indices (NDVI), calculated from NOAAAVHRR images, were correlated with annual transpiration (TR) estimates (i.e. annual precipitation minus runoff) for seven watersheds in Pennsylvania. A moderate relationship between the standardized variables was detected. The NDVI-TR relationship dramatically improved with improved watershed TR estimates. At the Little River watershed in Georgia, where the water balances of two sub-catchments could be reliably estimated over water cycles of variable length (about 2 months to 1 1/2 years), the correlation coefficient between NDVI and TR was found to be 0.94 (a sample size of 13). The present approach avoids the common practice of applying arbitrary hydrological models to validate the NDVI-TR relationship and attempts to minimize the effects of possible spurious correlations between the two variables that may stem from well-defined annual cycles in both the TR process and the foliage development of vegetation. It is concluded here that NDVI seems to reflect temporal changes in areal TR in a humid environment under well-vegetated conditions. (C) 2000 Elsevier Science B.V.

Original languageEnglish
Pages (from-to)65-79
Number of pages15
JournalEcological Modelling
Volume127
Issue number1
DOIs
Publication statusPublished - Mar 1 2000

Fingerprint

vegetation index
transpiration
remote sensing
NDVI
watershed
humid environment
hydrologic cycle
hydrologic models
annual cycle
water balance
foliage
water budget
runoff
normalized difference vegetation index
catchment
vegetation
rivers
stems
river
leaves

Keywords

  • Areal transpiration
  • Remotely sensed vegetation index

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics
  • Ecological Modelling
  • Ecology

Cite this

Can a vegetation index derived from remote sensing be indicative of areal transpiration? / Szilagyi, J.

In: Ecological Modelling, Vol. 127, No. 1, 01.03.2000, p. 65-79.

Research output: Contribution to journalArticle

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