Effects of Nitrogen Additions on Soil Respiration in an Asian Tropical Montane Rainforest

编号 010029802

推送时间 20210705

研究领域 森林生态 

年份 2021 

类型 期刊 

语种 英语

标题 Effects of Nitrogen Additions on Soil Respiration in an Asian Tropical Montane Rainforest

来源期刊 forest

期 第298期

发表时间 20210618

关键词 nitrogen addition;  soil respiration;  temperature sensitivity;  tropical forest; 

摘要 Understanding the impacts of nitrogen (N) addition on soil respiration (RS) and its temperature sensitivity (Q10) in tropical forests is very important for the global carbon cycle in a changing environment. Here, we investigated how RS respond to N addition in a tropical montane rainforest in Southern China. Four levels of N treatments (0, 25, 50, and 100 kg N ha?1 a?1 as control (CK), low N (N25), moderate N (N50), and high N (N100), respectively) were established in September 2010. Based on a static chamber-gas chromatography method, RS was measured from January 2015 to December 2018. RS exhibited significant seasonal variability, with low RS rates appeared in the dry season and high rates appeared in the wet season regardless of treatment. RS was significantly related to the measured soil temperature and moisture. Our results showed that soil RS increased after N additions, the mean annual RS was 7% higher in N25 plots, 8% higher in N50 plots, and 11% higher in N100 plots than that in the CK plots. However, the overall impacts of N additions on RS were statistically insignificant. For the entire study period, the CK, N25, N50, and N100 treatments yielded Q10 values of 2.27, 3.45, 4.11, and 2.94, respectively. N addition increased the temperature sensitivity (Q10) of RS. Our results suggest that increasing atmospheric N deposition may have a large impact on the stimulation of soil CO2 emissions from tropical rainforests in China. View Full-Text

服务人员 王璐

服务院士 蒋有绪

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