Relationship Between Crown Condition and Tree Diameter Growth in Southern Swedish Oaks

We studied correlation between crown conditions and tree-ring widths in 260 trees of pedunculate oak (Quercus robur L.) growing on 33 sites in southern Sweden. The tree-ring increment over 1998–2002 was highest in trees with healthy crowns, intermediate in trees with moderately declined crowns, and lowest in trees with heavily declining crowns. The time period with significant correlation between crown status and tree-ring increment varied between 10 years (given autocorrelation in tree-ring chronologies preserved) and 4 years (autocorrelation removed). In pairwise comparisons of three crown classes, differences in tree-ring increment between trees with healthy crowns and trees with heavily declining crowns were the most pronounced, Fisher LSD P value staying below 0.05 over 13 years (autocorrelation preserved ) or 4 years (autocorrelation removed). Over two 5-year periods (1993–1997 vs. 1998–2002) the cumulative increment increased significantly for trees with healthy crowns, did not change in trees with moderately declining crowns, and significantly decreased in trees with heavily declining crowns. For trees with healthy crowns, this dynamics may represent growth recovery after 1992 drought. Instead, oaks with defoliation above 60% appear to reach a threshold in their ability to recover growth. At sites on nutrient-poor soils cumulative increments over 1998–2002 differed significantly among trees with different crown condition and no differences were observed at sites on nutrient-rich soils. Analyses and interpretation of the oak growth trends as recovered from tree-ring chronologies may be improved by controlling for the crown status of the trees sampled, e.g., by using sampling strategy that would represent the average crown and growth conditions of the sites.

[1]  H. Andreae,et al.  Long-Term Acid Load and its Consequences in Forest Ecosystems of Saxony (Germany) , 2000 .

[2]  Magnus Löf.  UTHÅLLIGT SKOGSBRUK I ÄDELLÖVSKOG , 2008 .

[3]  M. Dobbertin,et al.  Potential sampling bias in long-term forest growth trends reconstructed from tree rings: A case study from the Italian Alps , 1998 .

[4]  B. Pedersen.  THE MORTALITY OF MIDWESTERN OVERSTORY OAKS AS A BIOINDICATOR OF ENVIRONMENTAL STRESS , 1999 .

[5]  F. Thomas,et al.  Abiotic and biotic factors and their interactions as causes of oak decline in Central Europe , 2002 .

[6]  Crown Condition and Needle Chemistry of Norway Spruce in Relation to Critical Loads of Acidity in South-East Norway , 2002 .

[7]  H. Sterba,et al.  Crown condition, needle mass, and sapwood area relationships of Norway spruce (Picea abies). , 2000 .

[8]  M. Fortin,et al.  The recent sugar maple decline in southern Quebec : probable causes deduced from tree rings , 1996 .

[9]  M. Bridge,et al.  An evaluation of standard oak tree growth in Ruislip woods, West London , 2000 .

[10]  C. Bigler,et al.  Growth-dependent tree mortality models based on tree rings , 2003 .

[11]  K. Ufnalski,et al.  Review of oak stand decline with special reference to the role of drought in Poland , 1998 .

[12]  John A. Hartigan,et al.  Clustering Algorithms , 1975 .

[13]  H. Fritts.  Laboratory of Tree -Ring Research University of Arizona , 1987 .

[14]  E. Matzner,et al.  Soil changes induced by air pollutant deposition and their implication for forests in central Europe , 1995 .

[15]  F. Thomas,et al.  Nutrient relations in healthy and damaged stands of mature oaks on clayey soils: two case studies in northwestern Germany , 1998 .

[16]  E. Halmschlager,et al.  The mycobiota in nonmycorrhizal roots of healthy and declining oaks , 2004 .

[17]  J. Neirynck,et al.  Relationships Between Crown Condition of Beech (Fagus sylvatica L.) and Throughfall Chemistry , 1999 .

[18]  B. Cutter,et al.  A dendrochronological study of black and scarlet oak decline in the Missouri Ozarks , 1995 .

[19]  Corresponding patterns of site quality, decline and tree growth in a sessile oak stand , 1998 .

[20]  W. Seidling.  Crown condition within integrated evaluations of Level II monitoring data at the German level , 2004, European Journal of Forest Research.

[21]  Matthias Dobbertin,et al.  Tree growth as indicator of tree vitality and of tree reaction to environmental stress: a review , 2005, European Journal of Forest Research.

[22]  H. Blaschke.  Decline symptoms on roots of Quercus robur , 1994 .

[23]  B. Zierl.  Relations between crown condition and ozone and its dependence on environmental factors. , 2002, Environmental pollution.

[24]  R. Dickson,et al.  Oak growth, development and carbon metabolism in response to water stress , 1996 .

[25]  R. Ouimet,et al.  Assessment of sugar maple health based on basal area growth pattern , 2003 .

[26]  R. Waring,et al.  Stem Growth per Unit of Leaf Area: A Measure of Tree Vigor , 1980 .

[27]  K. Sonesson.  Oak Decline in Southern Sweden , 1999 .

[28]  N. Luisi.  Recent advances in studies on oak decline , 1992 .

[29]  Harold C. Fritts,et al.  Tree Rings and Climate. , 1978 .

[30]  Matthias Dobbertin,et al.  Crown defoliation improves tree mortality models , 2001 .

[31]  Richard H. Waring,et al.  Characteristics of Trees Predisposed to Die , 1987 .

[32]  K. Briffa,et al.  The climatic interpretation of pan-European signature years in oak ring-width series , 2002 .

[33]  Alan S. White,et al.  Effects of chronic ammonium sulfate treatment on basal area increment in red spruce and sugar maple at the Bear Brook Watershed in Maine , 2003 .

[34]  F. James Rohlf,et al.  Biometry: The Principles and Practice of Statistics in Biological Research , 1969 .

[35]  Gert Jan Reinds,et al.  Intensive monitoring of forest ecosystems in Europe: 1. Objectives, set-up and evaluation strategy , 2003 .

[36]  D. Epron,et al.  Stomatal and non stomatal limitation of photosynthesis by leaf water deficits in three oak species: a comparison of gas exchange and chlorophyll a fluorescence data , 1990 .

[37]  T. Ahti,et al.  Vegetation zones and their sections in northwestern Europe , 1968 .

[38]  M. Stokes,et al.  An Introduction to Tree-Ring Dating , 1996 .

[39]  C. Bigler,et al.  Growth patterns as indicators of impending tree death in silver fir , 2004 .

[40]  F. Huber,et al.  Comparison of radial increment and volume growth in stems and roots of Quercus petraea , 2004, Plant and Soil.

[41]  G. Glatzel,et al.  Response of Quercus petraea seedlings to nitrogen fertilization , 2001 .

[42]  J. Pilcher,et al.  THE RELATIONSHIPS BETWEEN OAK TREE GROWTH AND CLIMATE IN BRITAIN , 1982 .