Seasonal variations of nitrogen flux and composition in a wet deposition forest ecosystem on Changbai Mountain

Abstract

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

Phosphorus Reduces Negative Effects of Nitrogen Addition on Soil Microbial Communities and Functions

“…Whether P addition can alter the effects of increasing N deposition on the soil microbial communities and functional potentials and therefore the C and N cycling in the temperate forest remains uncertain. The current N deposition rate in the Changbai mountain region in Jilin province of China is~27 kg N ha −1 yr −1 [32]. Although this rate approaches the critical load of nutrient N deposition in this region and tends to continuously increase in the future [32,33], the temperate broad-leaved Korean pine forest in this region has been considered as an N-limited ecosystem.…”

“…The current N deposition rate in the Changbai mountain region in Jilin province of China is~27 kg N ha −1 yr −1 [32]. Although this rate approaches the critical load of nutrient N deposition in this region and tends to continuously increase in the future [32,33], the temperate broad-leaved Korean pine forest in this region has been considered as an N-limited ecosystem. We build an N and P additions experiment in a typical broad-leaved Korean pine forest to study the ecological effects of the N addition and their interaction with P addition on soil microbes.…”