论文题目:

Temperature sensitivity of carbon dioxide production in aggregates and their responses to nitrogen addition in a freshwater marsh, Sanjiang Plain

英文论文题目:

Temperature sensitivity of carbon dioxide production in aggregates and their responses to nitrogen addition in a freshwater marsh, Sanjiang Plain

第一作者:

陶宝先

英文第一作者:

Tao, B. X.

联系作者:

宋长春

英文联系作者:

Song, C. C.

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发表年度:

2013

卷:

59

期:

6

页码:

953-960

摘要:

　　Nitrogen (N) availability may affect the decomposition of soil organic carbon (SOC) in a wetland experiencing global warming. The distribution of SOC within the soil matrix may be an important factor determining its turnover. However, the temperature sensitivity of SOC decomposition in aggregate and its response to N addition are crucial in the context of global warming but to date have been less obvious. Thus, an incubation experiment was conducted to investigate these problems in a freshwater marsh of Northeast China. The results showed that the rates of SOC decomposition in macro-aggregate were lower than that in micro-aggregate at high temperature (15 degrees C), whereas macro-aggregate was the main source of carbon fluxes due to the largest mass contribution to bulk soil. Increasing temperature had a positive effect, while N addition produced neutral and negative effects on SOC decomposition. The micro-aggregate had the largest temperature sensitivity (Q(10)) within a temperature range from 5 to 15 degrees C. A low level of N input had no effect on Q(10) value in macro- and micro-aggregate as well as bulk soil, whereas a high level of N input significantly decreased the temperature sensitivity in 2-1mm,< 0.25mm aggregates and bulk soil. Our results suggest that SOC decomposition in micro-aggregate may be more sensitive to increasing temperatures, whereas this positive feedback to global warming may be weakened by enhanced N deposition in the near future.

英文摘要:

刊物名称:

Soil Science and Plant Nutrition

英文刊物名称:

Soil Science and Plant Nutrition

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参与作者:

宋长春

英文参与作者:

Song, C. C.