青藏高原沼泽草甸生态系统环境因子及其近地表CO_2体积分数对气温升高的响应
Environmental factors and near-surface air CO_2 concentration of swamp-meadow ecosystem on Qinghai-Tibetan Plateau in response to long-term experimental ecosystem warming
查看参考文献25篇
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文摘
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采用自然升温方式,利用OTCs系统对青藏高原沼泽草甸生态系统分别进行3～5℃(OTC-80)和1～2℃(OTC-40)升温处理,研究环境因子对气温升高的响应及其与近地表CO_2体积分数的关系.结果表明:在日平均气温分别增高4.05,2.13℃的条件下,5 cm土壤温度平均上升3.67,1.65℃,而0～5 cm土壤含水量则分别下降7.9%,2.1%;系统内近地表CO_2体积分数比对照点的分别提高29.3,9.8μL/L.气温升高将促使青藏高原气候进一步向暖干化发展,碳库流失加剧,对全球气候变暖起正反馈作用.敏感性分析表明:5 cm土壤温度是影响OTC-80系统内和对照点近地表CO_2体积分数变化的最敏感因子,0～5 am土壤水分是影响OTG-40系统内近地表CO_2体积分数变化的最敏感因子. |
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其他语种文摘
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The responses of environmental factors to long-term experimental warming and their relationships with the near-surface air CO_2 concentration in the swamp meadow areas on the Qinghai-Tibetan Plateau were studied using OTCs systems with 3～5℃ (OTC-80) and 1～2℃ (OTC-40) elevated respectively. The results show that under the conditions in which the daily average air temperatures were 4.05 ℃ and 2.13℃ higher in the OTC-80 and OTC-40 chambers than those at the control points, respectively, the soil temperatures at the 5 cm depth in the OTC-80 and OTC-40 chambers were respectively 3.67 ℃and 1.65 ℃ higher than those at the control points. However, the soil moistures at the 0～5 cm depth in the OTC-80 and OTC-40 chambers were 7.9% and 2.1% lower than those at the control points, respectively, and in the whole observation period, the CO_2 concentrations in the OTC-80 chambers were averagely 29.3 μL/L higher than those at the control points and 9.8 μL/L higher in the OTC-40 chambers than those at the control points. Air temperature rising led the climate warming and drying, and accelerated the soil carbon loss in the Qinghai-Tibetan Plateau, which plays a role of positive feedback to the global warming. Sensitivity analysis showed that air temperature, soil temperature and moisture at the 5 cm depth were the major environmental factors affecting the changes of the near-surface CO_2 concentrations, of which the 5 cm soil temperature was the most sensitive factor for the CO_2 concentrations change in the OTC-80 chambers and at the control points, and, relatively, 0～5 cm soil moisture was the most sensitive factor for those in the OTC-40 chambers. |
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来源
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兰州大学学报. 自然科学版
,2009,45(3):27-33 【核心库】
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关键词
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开顶式温室
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气温升高
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二氧化碳
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沼泽草甸
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敏感性分析
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青藏高原
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地址
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中国科学院寒区旱区环境与工程研究所, 冻土工程国家重点实验室, 甘肃, 兰州, 730000
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中国科学院成都山地灾害与环境研究所, 四川, 成都, 610041
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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0455-2059 |
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学科
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环境科学基础理论 |
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基金
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国家自然科学基金国家杰出青年科学基金
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中国科学院寒区旱区环境与工程研究所青年人才基金
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国家973计划
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文献收藏号
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CSCD:3753094
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