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The Amount and Nutrient Content of Litter Fall under Sitka Spruce on Poorly Drained Soils
Authors:ADAMS, S. N.   DICKSON, E. L.   QUINN, C.
Affiliation:Agricultural and Food Chemistry Research Division, Department of Agriculture Newforge Lane, Belfast BT9 5PX, N. Ireland
Abstract:Litter fall was collected every three months for four yearsfrom twenty-one vigorous (Yield Class 18–20 m3 ha–1y–1) and sixteen less vigorous (Yield Class 10–12)plots of Sitka spruce on gleyed soils in Northern Ireland. Forty-fourper cent of all litter fell in the June-August quarter, andlitter fall was heaviest in years when there was green spruceaphis attack. Beneath YC 10–12 crops, both rate and quantityof litter fall was less and nutrient concentrations were lower,than under YC 18–20 crops. As the pool of organic matterand nutrients on the forest floor was greater under trees ofYC 10–12, poor growth was associated with a slow organicmatter and nutrient turnover.
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