Journal article

Publication year: 2019

Pages: 49-56

Journal: Applied Soil Ecology

Volume number: 137

ISSN: 0929-1393

DOI Link: https://doi.org/10.1016/j.apsoil.2019.01.008

Publisher: Elsevier

Abstract: 
Nitrogen (N) losses are related to N deposition and activity of microbes that affect N dynamics. However, the effects of N deposition on gross N dynamics and mechanisms of N losses are not fully understood. Here, we quantified N losses from runoff and gaseous N (NO, N2O) emissions, assessed gross N transformation rates using N-15 tracing, and recorded microbe abundance using real-time PCR in a temperate Korean pine plantation treated with zero N (control), low-N (20 kg N ha(-1 )yr(-1)), moderate-N (40 kg N ha(-1) yr(-1)) and high-N (80 kg N ha(-1) yr(-1)). The results showed that total N loss (N2O, NO and surface runoff) during the growing season was higher with N addition, where it was 0.86 kg N ha(-1) in control and 1.83 kg N ha(-1) in the high-N treatment. NH(4)(+ )and DON losses from surface runoff and NO loss from gas emissions were higher with N addition, whereas gross N mineralization and autotrophic nitrification rates were lower. Gross mineral N immobilization and dissimilatory nitrate reduction to ammonium rates were very low, and immobilization of NH4+ and NO3- varied among the treatments. The contrast between stimulated mineral N losses and suppressed mineral N production processes (mineralization and nitrification) with N addition showed that greater mineral N losses were likely related to losses from recently added N, rather than from old N converted from the native N pool, as a result of mineralization and nitrification processes. Suppressed NH4+ and NO3- immobilizations in some treatments also contributed to greater N losses.

Harvard Citation style: Song, L., Zhang, J., Müller, C. and Jin, G. (2019) Responses of soil N transformations and N loss to three years of simulated N deposition in a temperate Korean pine plantation in northeast China, Applied Soil Ecology, 137, pp. 49-56. https://doi.org/10.1016/j.apsoil.2019.01.008

APA Citation style: Song, L., Zhang, J., Müller, C., & Jin, G. (2019). Responses of soil N transformations and N loss to three years of simulated N deposition in a temperate Korean pine plantation in northeast China. Applied Soil Ecology. 137, 49-56. https://doi.org/10.1016/j.apsoil.2019.01.008