Reduced Carbon Dioxide Sink and Methane Source under Extreme Drought Condition in an Alpine Peatland
| العنوان: | Reduced Carbon Dioxide Sink and Methane Source under Extreme Drought Condition in an Alpine Peatland |
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| المؤلفون: | Kerou Zhang, Liang Yan, Haidong Wu, Xiaoming Kang, Xiaodong Zhang, Yuan Zhang, Yong Li, Yanbin Hao, Wei Li, Jinzhi Wang, Zhongqing Yan, Lijuan Cui |
| المصدر: | Sustainability Volume 10 Issue 11 Sustainability, Vol 10, Iss 11, p 4285 (2018) |
| بيانات النشر: | MDPI AG, 2018. |
| سنة النشر: | 2018 |
| مصطلحات موضوعية: | Peat, extreme drought, controlled experiment, 010504 meteorology & atmospheric sciences, Geography, Planning and Development, TJ807-830, Growing season, Management, Monitoring, Policy and Law, TD194-195, Atmospheric sciences, 01 natural sciences, Renewable energy sources, Sink (geography), Carbon cycle, carbon budget, chemistry.chemical_compound, GE1-350, Ecosystem, alpine peatland, 0105 earth and related environmental sciences, geography, geography.geographical_feature_category, Environmental effects of industries and plants, Renewable Energy, Sustainability and the Environment, Carbon sink, 04 agricultural and veterinary sciences, Environmental sciences, chemistry, Carbon dioxide, 040103 agronomy & agriculture, 0401 agriculture, forestry, and fisheries, Environmental science, Ecosystem respiration |
| الوصف: | Potential changes in both the intensity and frequency of extreme drought events are vital aspects of regional climate change that can alter the distribution and dynamics of water availability and subsequently affect carbon cycles at the ecosystem level. The effects of extreme drought events on the carbon budget of peatland in the Zoige plateau and its response mechanisms were studied using an in-field controlled experimental method. The results indicated that the peatland ecosystem of the Zoige plateau functioned as a carbon sink while under the control (CK) or extreme drought (D) treatment throughout the entire growing season. Maximum fluxes of methane (CH4) emissions and the weakest carbon sink activity from this ecosystem were in the early growth stage, the most powerful carbon sink activity was during the peak growth stage, while the absorption sink activity of carbon dioxide (CO2) and CH4 was present during the senescence stage. Extreme drought reduced the gross primary productivity (GPP) and ecosystem respiration (Re) of the peatland ecosystem by 14.5% and 12.6%, respectively (p < 0.05) and the net ability to store carbon was reduced by 11.3%. Overall, the GPP was highly sensitive to extreme drought. Moreover, extreme drought significantly reduced the CH4 fluxes of the ecosystem and even changed the peatland from a CH4 emission source to a CH4 sink. Subsequent to drought treatment, extreme drought was also shown to have a carry-over effect on the carbon budget of this ecosystem. Soil water content and soil temperature were the main driving factors of carbon budget change in the peatland of the Zoige plateau, but with the increase in soil depth, these driving forces were decreased. The findings indicated that frequent extreme drought events in the future might reduce the net carbon sink function of peatland areas, with an especially strong influence on CO2. |
| وصف الملف: | application/pdf |
| تدمد: | 2071-1050 |
| الوصول الحر: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::d5e9dd44b79111d6d9eef8ca7c3097baTest https://doi.org/10.3390/su10114285Test |
| حقوق: | OPEN |
| رقم الانضمام: | edsair.doi.dedup.....d5e9dd44b79111d6d9eef8ca7c3097ba |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 20711050 |
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