Forest vegetation carbon dynamics are widely considered as basic indicators of the capacity of a forest ecosystem for carbon sequestration and carbon exchange with the atmosphere and the ability of the forest ecosystem to function as a carbon sink or source. Forest management practices such as harvesting, afforestation, and reforestation are the most important factors that influence forest carbon dynamics. Therefore, elucidation of the effects of human silvicultural activities on forest ecosystem dynamics will provide a valuable insight into ways of expanding the size of the carbon pool and improving

In the last 150 years, human activities such as fossil fuel usage and centralized agricultural schemes have resulted in the emission of large amounts of reactive nitrogen. Most of this reactive nitrogen falls to the ground via wet deposition as precipitation or dust fall. Nitrogen deposition plays a key role in the nitrogen biogeochemical cycles. Hence, quantification of nitrogen deposition in different areas is important for eco鄄security assessment. The Changbai Mountain region is a typical temperature forest in China; however, data regarding nitrogen deposition in this region are scarce. Investigation of nitrogen deposition in the Changbai Mountain region can provide a scientific basis for understanding nitrogen cycling in similar natural ecosystems. We conducted our present study at the Changbai Mountain Research Station of Forest Ecosystems. During 2009-2010, we collected rain and snow samples by using a rain gauge. We analyzed the concentrations

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Influence of selection cutting on sustainable timber production of a broadleaved Korean pine ( Pinus koraiensis) forest on Changbai Mountain.

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