Responses of the reflectance indices PRI and NDVI to experimental warming and drought in Europan shrublands along a north-south climatic gradient

Pille Mänd, Lea Hallik, Josep Peñuelas, Tiit Nielsen, Pierpaolo Duce, Bridget A. Emmett, Claus Beier, Marc Estiarte, János Garadnai, Tibor Kalapos, Inger Kappel Schmidt, Edit Kovács-Láng, Patricia Prieto, Albert Tietema, Joke W. Westerveld, Olevi Kull