Ann. For. Sci.
Volume 67, Number 8, December 2010
|Number of page(s)||7|
|Section||Opinions and Comments|
|Published online||29 October 2010|
Stop-words filtered out of the character strings extracted from the titles of our study sample.
Coincidence of (A) the decreasing trend word “SO-2” and the reduction of modelled critical loads in Europe until 2005 (=grey area; Hettelingh et al., 2005), and (B) the increasing trend word “boreal” and climate warming (=grey area; IPCC, 2007). Fitted curves of relative trend word frequencies (solid symbols) and temperature anomalies (asterisks) are calculated by cubic smoothing splines (df = 4).
© INRA, EDP Sciences, 2010