Many higher plants have mycorrhizae associated with their roots. These structures are often essential for survival and growth (Harley & Smith 1983). Mycorrhizae are known for the abilities to enhance nutrient absorption. ...

Information about forest substrate respiration, nitrogenase activity and mineralizable nitrogen may be incorporated into carbon and nitrogen budgets that comprise an important element of forest management planning. In t ...

Denitrification, the biological or chemical reduction of ionic nitrogen oxide or dinitrogen, has not been widely studied in forest ecosystems despite widespread interest in other facets of the forest nitrogen economy. Th ...

Effects of partial understory removal on belowground and aboveground ecosystem properties were investigated in 5 and 15 yr old Douglas-fir (Pseudotsuga menziesll (Mirb.) Franco) experimental plantations in western Oregon ...

Disturbance, whether natural or of human origin, modifies to varying degrees many ecosystem attributes. Fire is a natural process in the montane forests of southern Oregon but for much of the 20th century fire was view ...

Adaptive ecosystem management is a new paradigm for managing federal forests which requires regular monitoring of ecosystem function and diversity to measure the effects of management. Managers need new strategies and to ...

The role of insect herbivores in the nutrient cycling dynamics of forest ecosystems remains poorly understood. Although past research in herbivory has focused primarily on the deleterious effects that insects can have ...

In an agrisilviculture system, trees and crops compete for above and below ground resources. This study aimed at quantifying the effect of shoot pruning and root barriers around pollarded trees on the production of crop ...

Widespread erosion of the Yellow River loess plateau has led to serious soil and water conservation problems for north central China. In the DingXi District of Gansu Province, with less than 400 mm annual precipitation, ...

The use of Native American fire regimes evolved in the Klamath-Siskiyou bioregion over millennia. A mixture of Native American and Euro-American sociocultural management has developed from adaptations to climate, topog ...