Effects of nitrogen deposition on soil sulfur cycling

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• 作者：Hao Chen ; Liqiong Yang ; Li Wen ; Pan Luo ; Lu Liu ; Yi Yang ; Kelin Wang ; Dejun Li
• 刊名：Global Biogeochemical Cycles
• 出版年：2016
• 出版时间：November 2016
• 年：2016
• 卷：30
• 期：11
• 页码：1568-1577
• 全文大小：897.8KB
• ISSN：1944-9224

文摘

Increased atmospheric nitrogen (N) deposition has been found to alter processes and functions of terrestrial ecosystems including the biogeochemical cycling of N and other elements, e.g., phosphorus (P), calcium (Ca), and potassium (K). Nevertheless, how N deposition changes sulfur (S) cycling is largely unknown. Based on a meta-analysis and a lab N addition experiment, here we show that N addition significantly suppresses the activity of soil arylsulfatase, which is a major enzyme involved in the mineralization of organic S. The evidence suggests that N-induced decrease in soil pH is responsible for the decrease of arylsulfatase activity. Soil buffering capacity plays a critical role in mediating the extent of arylsulfatase activity response to N inputs via its regulation on soil pH. Our results suggest that N deposition may slow down S cycling by suppressing soil organic S mineralization.