一次降水过程对青藏高原高寒草甸CO_2通量和热量输送的影响
Effects of one precipitation process on CO_2 flux and thermal transportation in alpine meadow of Qinghai-Tibetan Plateau
查看参考文献21篇
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文摘
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青藏高原高寒草甸的热量输送和碳收支对气候变化的响应十分敏感，降水过程对其影响较为复杂。利用三维超声风速仪和红外CO_2／H_2O分析仪，以及常规微气象要素的涡度相关观测系统，分析了2002年8月8—17日的一次降水过程对青藏高原高寒草甸CO_2通量和热量输送的影响。结果表明：降水过程使气温、地温和辐射等有所降低，大气湿度和CO_2通量有所升高；气温、地温、总辐射、地表反射辐射、光合有效辐射（PAR）、净辐射、土壤热通量、潜热通量和显热通量分别下降了23．3％、23．1％、61．9％、58．9％、61．7％、57．9％、268．3％、61．6％和71．0％，大气湿度和CO_2通量分别升高了27．0％和38．6％；降水削弱了PAR对白天净生态系统CO_2交换量（NEE）的影响，而增加了地温对夜间呼吸的控制；降水强度对白天NEE几乎没有影响，但能降低夜间呼吸。 |
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其他语种文摘
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The thermal transportation and carbon budget in alpine meadow of Qinghai-Tibetan Plateau are highly sensitive to climate change, but little research was made about the influence of precipitation because of its complicacy. Based on the data measured by three-dimensional uhrasonic anemometer and fast-response open-path infrared CO_2/H_2O analyzer, the effects of one pre- cipitation process from 8-17 August, 2002 on the thermal transportation and CO_2 flux in alpine meadow of northeastern Qinghai-Tibetan Plateau were analyzed. The results showed that the pre- cipitation process decreased the air temperature, soil temperature, total radiation, surface reflected radiation, photosynthetically active radiation （PAR）, net radiation, soil heat flux, latent heat flux, and sensible heat flux by 23.3%, 23.1%, 61.9%, 58.9%, 61.7%, 57.9%, 268.3%, 61.6%, and 71.0%, and increased the atmospheric humidity and CO_2 flux by 27.0% and 38.6%, respectively. Precipitation weakened the influence of PAR on the daytime net CO_2 exchange （NEE） of the alpine meadow ecosystem, but enhanced the effects of soil temperature on nighttime respiration. Precipitation intensity had no significant influence on the daytime NEE, but decreased the nighttime respiration. |
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来源
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生态学杂志
,2008,27(10):1685-1691 【核心库】
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关键词
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降水过程
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高寒草甸
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CO_2
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通量
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热量传输
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地址
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1.
中国科学院西北高原生物研究所, 青海, 西宁, 810001
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日本农业环境技术研究所, 日本
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日本国立环境研究所, 日本
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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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1000-4890 |
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学科
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普通生物学 |
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基金
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中国科学院知识创新工程西部行动计划项目
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中国科学院知识创新工程重要方向项目
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国家科技支撑计划项目
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中日合作项目、中日合作
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中国科学院“百人计划”项目
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文献收藏号
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CSCD:3397395
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