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NTIS 바로가기Communications in soil science and plant analysis, v.36 no.15/16, 2005년, pp.2129 - 2135
Kang, Hojeong (Department of Environmental Science and Technology, Ewha Womans University, Seoul, Korea) , Lee, Dowon (Graduate School of Environmental Studies, Seoul National University, Seoul, Korea)
Forest ecosystems are known to be nitrogen (N) limited, and productivity often increases with N additions. However, recent studies have suggested that additions of excessive N through atmospheric deposition may affect soil processes adversely. In this study, we conducted a laboratory‐based manipulation experiment to reveal the effects of N additions on extracellular enzyme activities in a temperate forest soil. Three different levels of N additions (water‐only control, low N addition, and high N addition) were applied to soil columns (2.5‐cm diameter×12 cm height) over 4 weeks. Overall, the additions of N decreased specific activities (enzyme activity per log bacterial cell number) of urease, glutaminase, phosphatase, and arylsulfatase significantly. However, dehydrogenase activity was increased with the high N addition. The results suggest that N deposition may impede nutrient cycling, particularly mineralization of organic nutrients. In addition, this enzyme inhibition may be one of the mechanisms for N retention observed in forest floors.
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