The role of long-term site productivity in maintaining healthy ecosystems: A prerequisite of ecosystem management

Forest health is a central issue across North America. Most definitions imply that forest health is a condition of the forest ecosystem which sustains complexity or diversity while still providing for human needs. Imbedded in this definition is the need to maintain the productive capacity of managed sites. Although site productivity is largely a function of climate, soil properties, and the biotic potential of the vegetation occupying the site, forest management can also play an influential role in altering site productivity.In terms of site productivity, different concerns exist when managing different ecosites. Based on a recently-conducted expert opinion survey, the major concerns when harvesting black spruce from shallow-soil, upland sites were: 1) harvest-related nutrient removals, and 2) loss of organic matter. In contrast to these ecosites, the major concerns for organic sites (including wet, mineral soils) were: 1) altered hydrology, and 2) rutting. The water table on these sites is typically near...