Level II beech plot measurements

Variables monitored in UK Beech long-term forest monitoring plots

Variables	Period	Frequency of sampling
Foliar sampling and analysis	2005	Once
Foliar sampling and analysis	2007	Once
Increment	2004	Once
Crown condition	1991-2001	Annual
Crown condition	2002-2006	Annual
Meteorology	2002	Continuous (automatic)
	2003-2005	Continuous (automatic)
	2006	Continuous (automatic)
Deposition volume	2002-2008	4 weeks
Deposition volume	2009-2010	4 weeks
SO₂,O₃NO_xNH₄ below canopy (diffusion tubes)	2002-2005	Monthly
Ground vegetation	2004	Once
Ground vegetation	2007	Once
Litter fall quantification	2002-2008	4 weeks (2 weeks in autumn)
Litter fall quantification	2009-2010	4 weeks (2 weeks in autumn)
Litter fall analysis	2009	Once
Growth uptake of heavy metals	2003	Single measurement