Long-term effects of stump removal to control root rot on forest soil bulk density, soil carbon and nitrogen content.

Abstract

Phellinus weirii (Mum.) Gilb is a native pathogen in the forests of the Northwestern United States causing laminated root rot and mortality in Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) and other susceptible conifer species. This facultative saprophyte is a natural part of the ecosystem, present in most Douglas-fir forests of the Pacific Northwest. In a natural stand, the tree mortality caused by P. weirii creates openings that will be occupied by resistant or early-successional plant species, and creates habitat changes that increase overall species diversity in the forest. In a managed forest, P. weirii can exist as a saprophyte in the stumps and roots of infested trees that are harvested. Spread of the fungus is usually vegetative and occurs when seedling roots come in contact with infested stumps or roots. Laminated root rot can cause growth reduction, mortality, and economic loss, especially in harvested stands that regenerate to Douglas-fir or other susceptible conifer species. Spread of the fungus by root contact can create infestations many hectares in size.

Citation

Zabowski, D.; Chambrear, D.; Rotramel, N.; Thies, W.G. 2008. Long-term effects of stump removal to control root rot on forest soil bulk density, soil carbon and nitrogen content. Forest Ecology and Management. 255(3-4): 720-727