Nutrient stress in young scots pines suffering from needle loss in a dry heath forest
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Abstract
In the early summer of 1987 an untimely needle loss was observed in Scots pine (Pinus sylvestris L.) of different ages growing on oliogotrophic mineral soils in Cladina and Calluna-type heath forests in northern Finland. The first symptoms were observed at the beginning of July when current shoot growth was ending and the young needles were flushing. The older needles first yellowed then later turned brown before falling. Needle loss proceeded from the oldest to the younger needle age classes. The trees lost between one and four age classes of needles from earlier growth and retained only the most recent 1 to 3 yr needles. Foliar analysis indicated nutrient stress as revealed by retranslocation of mobile nutrients such as N and insufficient uptake of immobile nutrients such as Ca. The soil nutrient concentration, however, was normal at poor sites and therefore it appears the primary reason for needle loss is a nutrient stress due to root damage. This damage was caused by unusual weather in the winter of 1986 to 1987, rather than by soluble Al.
Keywords
Nutrient Stress Root Damage Poor Site Mobile Nutrient Soil Nutrient ConcentrationPreview
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