Effects of Laminated Root Rot on Relationships Between Stem Growth and Root-System Size, Morphology, and Spatial Distribution in Douglas-fir
Root-system size (length, cross-sectional area, and volume) was measured in 30- to 40-year-old Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) in five stands. Mean root-system size varied widely among stands (length 2,485-5,316 cm; cross-sectional area 4,070-13,520 cm²; volume 72,760-251,020 cm³). Percentage of roots decayed by Phellinus weirii varied among stands and among root orders ranging 22-83 percent by length and 21-84 percent by volume. Root size distribution in P. weirii-infected trees was generally of the same magnitude and pattern as in healthy trees. Diameter at breast height (dbh) was highly correlated with total root-system size in all stands in all three root measures. Height was highly correlated with total root-system size in four stands. Diameter at breast height increment and dbh increment percent and height-dbh ratio were moderately correlated with root-system size in some stands and for some root measures. Height increment percent was poorly correlated with root-system size. Correlations of most stem variables with sizes or percent decay of roots stratified by root orders and by distance and depth zones were significantly stronger than correlations with total root-system size. Healthy and infected trees differed in the root orders and zones that were most strongly correlated with stem-growth variables. Diameter at breast height and height were mostly positively correlated with infected and healthy root sizes whereas increment variables were predominantly inversely correlated with infected root size. Stem radii measured vertically above junctions of infected roots with the stem base were smaller than those measured above junctions of healthy roots. Radial increments above infected roots producing adventitious branches were greater than those above other infected roots or above healthy roots. Forest Sci. 32:202-219.
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Document Type: Journal Article
Affiliations: Research Technician, Pacific Forest Research Centre, Agriculture Canada, Canadian Forestry Service, Victoria, B.C. V8Z 1M5
Publication date: 1986-03-01
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