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	Crown condition assessment in the LWF plots
	Christian Hug (Project leader) Matthias Dobbertin

Contents: Rationale Project aims Methods Work plan Publications Participants

Rationale Since 1985, the condition of forests in Switzerland has been monitored through the Sanasilva Inventory. This is based on a systematic sampling programme, using a network of plots. Although the network provides representative results for Swiss forests, the network design is inappropriate for cause-effect research. The LWF plots are providing a variety of ecologically relevant data (including information on soils, vegetation, meteorology, pollutant deposition etc.). It is therefore important to have good information on the condition of the trees in the plots. At the same time, assessing the crown condition of trees in the LWF plots provides an important link between the results from this sub-programme and those of the Sanasilva Inventory. Project aims The aims of this project are: to determine the relationships between crown condition and a number of environmental parameters determined on site to provide a link between the LWF and Sanasilva sub-programmes to develop the basis for a better explanation of the trends recorded in the Sanasilva inventory. Back to contents Methods A full inventory of the crown condition of all trees > 12 cm diameter is made in each LWF plot at the start of the programme. This is repeated at regular intervals, using a rolling assessment programme so that the work is spread evenly. An annual assessment of the crown condition of trees > 12 cm diameter in a 50x50 m subplot is made. The assessment methods are based on those used in the Sanasilva inventory. Work plan Inventories have been completed for the following sites:  Alptal, Beatenberg,  Bettlachstock, Celerina, Chironico, Isone,  Jussy, Lausanne, Lens, Nationalpark, Neunkirch, Novaggio, Othmarsingen, Schänis, Visp and Vordemwald.  Completed and planned inventories (including the 50x50m subplots) are listed in Table 1. Table 1. Completed and planned crown condition inventories on LTFER plots 1. priority 2. priority 3. priority year Bea Bet Cel Lau Nov Sch Vor Chi Jus Len Nat Oth Vis Alp Iso Neu Lan 1994 - - - f - - - - - - - f - - - - - 1995 - f - sAB f - sAB sAB f - - sAB - f sAB f - 1996 - s - sAB s - f sAB sAB sAB sAB sAB sAB f sAB sAB - 1997 sAB s sAB sAB s - sAB sA sA sB sB sAB sAB f sA sAB - 1998 f s f sAB s sAB sAB f sB sA f sAB f f sB sAB - 1999 sAB s sAB sAB s f sAB sB sAB f sA s sAB f sAB sAB - 2000 sAB s sAB sAB s sAB sAB sA sAB sB sB f sAB f sA sAB - 2001 sAB s sAB f s sAB sAB sB sAB sA sA s sAB f sB sAB sAB 2002 sAB s sAB sAB s sAB sAB sA sAB sB sB s sAB f f sAB sAB 2003 sAB s sAB sAB s sAB sAB sB sAB sA sA s sAB f sA sAB f 2004 sAB s sAB sAB s sAB sAB sA sAB sB sB s sAB f sB sAB sAB 2005 sAB f sAB sAB f sAB sAB sB sAB sA sA s sAB f sA sAB sAB 2006 sAB s sAB sAB s sAB f sA sAB sB sB s f f sB sAB sAB 2007 sAB s sAB sAB s sAB sAB sB f sA sA s sAB f sA sAB sA 2008 f s f sAB s sAB sAB sA sAB sB sB s sAB f sB sAB sB 2009 sAB s sAB sAB s f sAB sB sAB sA sA s sAB f sA sAB sA 2010 sAB s sAB sAB s sAB sAB f sAB sB sB s sAB f sB sAB sB 2011 sAB s sAB f s sAB sAB sA sAB sA sA s sAB f sA sAB sA 2012 sAB s sAB sAB s sAB sAB sB sAB sB sB f sAB f sB sAB sB 2013 sAB s sAB sAB s sAB sAB sA sAB sA sA s sAB f sA sAB sA 2014 sAB s sAB sAB s sAB sAB sB sAB f sB s f f sB sAB sB 2015 sAB f sAB sAB f sAB sAB sA sAB sB sA s sAB f sA f sA 2016 sAB s sAB sAB s sAB f sB sAB sA sB s sAB f sB sAB sB 2017 sAB s sAB sAB s sAB sAB sA sAB sB sA s sAB f sA sAB sA 2018 f s f sAB s sAB sAB sB sAB sA f s sAB f sB sAB sB 2019 sAB s sAB sAB s f sAB sA sAB sB sB s sAB f sA sAB sA reps f = 10 10 10 10 10 10 10 12 12 15 20 12 8 1 20 20 20 f= full inventory fA/B = full inventory on plot A or B s = inventory on subplot(s) (A or/and B) Publications Brang P. (Redaktion), 1998. Sanasilva-Bericht 1997. Gesundheit und Gefährdung des Schweizer Waldes - eine Zwischenbilanz nach 15 Jahren Waldschadenforschung. Berichte der Eidg. Forschungsanstalt für Wald, Schnee und Landschaft 345, 102 p. Innes J.L., Ghosh S., Schwyzer A., 1996. A method for the identification of trees with unusually colored foliage. Canadian Journal of Forest Research 26(9): 1548-1555. (abstract) Innes J.L., Eichhorn J., Ferretti M., Roskams P., 1997 . Visual assessment of tree condition. In: Manual on methods and criteria for harmonized sampling, assessment, monitoring and analysis of the effects of air pollution on forests. Hamburg and Prague, United Nations Economic Commission for Europe, International Cooperative Programme on Assessment and Monitoring of Air Pollution Effects on Forests (ICP-Forests), Programme Coordinating Centres. Innes J.L., 1998. Role of diagnostic studies in forest monitoring programmes. Chemosphere 36(4): 1025-1030. Participants Matthias Dobbertin Christian Hug Back to contents

Projekt 6.95.950 "Aufnahme der Merkmale der Sanasilva-Inventur auf Dauerbeobachtungsflächen"

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