A new wetness index to evaluate the soil water availability influence on gross primary production of european forests

TitleA new wetness index to evaluate the soil water availability influence on gross primary production of european forests
Publication TypeArticolo su Rivista peer-reviewed
Year of Publication2019
AuthorsProietti, C., Anav A., Vitale M., Fares S., Fornasier F., Screpanti A., Salvati L., Paoletti E., Sicard P., and De Marco Alessandra
JournalClimate
Volume7
ISSN22251154
KeywordsCrown defoliation, drought, Gross primary production, Modified Temperature Vegetation Wetness Index, MODIS, Soil moisture
Abstract

Rising temperature, drought and more-frequent extreme climatic events have been predicted for the next decades in many regions around the globe. In this framework, soil water availability plays a pivotal role in affecting vegetation productivity, especially in arid or semi-arid environments. However, direct measurements of soil moisture are scarce, and modeling estimations are still subject to biases. Further investigation on the effect of soil moisture on plant productivity is required. This study aims at analyzing spatio-temporal variations of a modified temperature vegetation wetness index (mTVWI), a proxy of soil moisture, and evaluating its effect on gross primary production (GPP) in forests. The study was carried out in Europe on 19 representative tree species during the 2000-2010 time period. Results outline a north-south gradient of mTVWI with minimum values (low soil water availability) in Southern Europe and maximum values (high soil water availability) in Northeastern Europe. A low soil water availability negatively affected GPP from 20 to 80%, as a function of site location, tree species, and weather conditions. Such a wetness index improves our understanding of water stress impacts, which is crucial for predicting the response of forest carbon cycling to drought and aridity. © 2019 by the authors.

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URLhttps://www.scopus.com/inward/record.uri?eid=2-s2.0-85063806748&doi=10.3390%2fcli7030042&partnerID=40&md5=44ad36ec76ee4859d26ba309fd6ba9b0
DOI10.3390/cli7030042