Environmental correlates of multiple-stem formation in Betula pubescens ssp. tortuosa
作者： Theo Verwijst
DOI: 10.1007/BF00047385
关键词: Betula pubescens 、 Biology 、 Humus 、 Waterlogging (agriculture) 、 Canonical correspondence analysis 、 Plant ecology 、 Soil horizon 、 Botany 、 Soil pH 、 Betulaceae
摘要: Mountain birch (Betula pubescens ssp. tortuosa (Ledeb.) Nyman) shows extensive variation in the number of trunks per genet. Previous investigations have suggested that polycormism (multiple-stem formation) is associated with soils a low nutrient content and also sites relatively shallow snow cover. These studies however lack quantitative measurements on stems Canonical correspondence analysis, regression analysis correlation were used to investigate environmental correlates mountain Swedish Lapland. The best predictor for pH B C soil horizons: pure monocormous stands are expected habitats 5.7 or higher, increases decreasing pH. Multiple-stem formation at high values waterlogging composition vegetation field layer correlated along gradient. Betula regenerates mainly via sprouts from stem base: root seedlings uncommon. Decreased vigour tallest polycormous units indicated selfthinning classical sense (i.e. mortality small due suppression by larger ones) does not play role dynamics stands.
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