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Citation:

Response of Soil Respiration to Soil Warming and Throughfall Exclusion in Warm-temperate Oak Forest in Drought Year

  • Received Date: 2015-04-20
    Accepted Date: 2016-01-20
  • [Objective] To explore the response of soil respiration to climate warming and drought and address the feedbacks between climate change and soil carbon flux. [Method] Infrared radiation heater and throughfall exclusion were conducted to simulate warming and drought in Warm-temperate oak (Quercus aliena var. acuteserrata) forest soil. The soil respiration was measured in drought year to analyze the effect of the Control, Warming+Drought, and Warming and Drought treatments on soil respiration in growing season by using LI-8100 system. [Result] The result showed that:the soil respiration of 4 treatments were 1.78 μmol CO2m-2s-1, 1.84 μmol CO2m-2s-1, 2.02 μmol CO2m-2s-1 and 2.01 μmol CO2m-2s-1, the soil temperature and soil moisture respectively explained 68.2%~87.5% and 51.0%~66.6% of the temporal variation of soil respiration. The soil respiration in drought season was lower than that in growing season. The correlation coefficient (soil respiration vs. soil temperature) decreased in warming treatment in drought season, but increased in the relationship of soil respiration and soil moisture. [Conclusion] Soil temperature and moisture are the main factors in regulating soil respiration in drought year,and the limited effect of soil moisture to soil respiration, which is induced by warming treatment, will mitigate the positive feedbacks between soil carbon flux and climate warming in drought season.
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Response of Soil Respiration to Soil Warming and Throughfall Exclusion in Warm-temperate Oak Forest in Drought Year

  • 1. Research Institute of Forest Ecology, Environment and Protection, Chinese Academy of Forestry, Key Laboratory of Forest Ecology and Environment, State Forestry Administration, Beijing 100091, China

Abstract: [Objective] To explore the response of soil respiration to climate warming and drought and address the feedbacks between climate change and soil carbon flux. [Method] Infrared radiation heater and throughfall exclusion were conducted to simulate warming and drought in Warm-temperate oak (Quercus aliena var. acuteserrata) forest soil. The soil respiration was measured in drought year to analyze the effect of the Control, Warming+Drought, and Warming and Drought treatments on soil respiration in growing season by using LI-8100 system. [Result] The result showed that:the soil respiration of 4 treatments were 1.78 μmol CO2m-2s-1, 1.84 μmol CO2m-2s-1, 2.02 μmol CO2m-2s-1 and 2.01 μmol CO2m-2s-1, the soil temperature and soil moisture respectively explained 68.2%~87.5% and 51.0%~66.6% of the temporal variation of soil respiration. The soil respiration in drought season was lower than that in growing season. The correlation coefficient (soil respiration vs. soil temperature) decreased in warming treatment in drought season, but increased in the relationship of soil respiration and soil moisture. [Conclusion] Soil temperature and moisture are the main factors in regulating soil respiration in drought year,and the limited effect of soil moisture to soil respiration, which is induced by warming treatment, will mitigate the positive feedbacks between soil carbon flux and climate warming in drought season.

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