Jyrki Hytönen and Mikko Moilanen
Proceedings of the 14th International Peat Congress
foliar-nutrients, peat-nutrients, whole-tree-harvesting
Theme VII. Ecology and management on forested peatlands
The differences between harvesting intensities as regards to the amount and the nutrient content of logging residues left on site after fist thinning were studied on five mires drained for forestry. Logging residues left on the sites were weighed and peat and foliar samples were taken from remaining trees and their nutrient concentrations were determined. The amount of logging residues was highest after cut-to-length harvesting. In whole tree harvesting the amount of logging residues was 33–66% of that of cut-to-length harvesting. When compared with peat nutrient stores, the highest relative export of nutrients was recorded in the cases of potassium and boron, especially in whole tree harvesting. However, during the first post harvesting years the amount of slash left on site had only minor effect on the nutrition status of trees.