青藏高原矮嵩草草甸和金露梅灌丛草甸CO2通量变化与环境因子的关系
Relations between Carbon Dioxide Fluxes and Environmental Factors of Kobresia humilis Meadows and Potentilla fruticosa Meadows
查看参考文献27篇
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文摘
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利用涡度相关技术观测了青藏高原两个典型的生态系统即矮嵩草（Kobresia humilis）草甸和金露梅（Potentilla fruticosa）灌丛草甸的CO2通量，并就2003年8月份的数据，分析了生态系统通量变化与环境因子的关系。8月份是这两个生态系统的叶面积指数达到最高也是相对稳定的时期，在此期间矮嵩草草甸和金露梅灌丛草甸净碳吸收量分别达56．2和32．6g C·m^-2，日CO2吸收量最大值分别为12．7μmol·m^-2·s^-1和9．3μmol·m^-2·s^-1，排放量最大值分别为5．1μmol·m^-2·s^-1和5．7μmol·m^-2·s^-1。在相同光合有效光量子通量密度（PPFD）条件下，矮嵩草草甸CO2吸收速度大于金露梅灌丛草甸；在PPFD高于1200μmol·m^-2·s^-1。的条件下，随气温增加，两生态系统的CO2吸收速度都下降，但矮嵩草草甸的下降速度（-0．086）比金露梅灌丛草甸（-0．016）快。土壤水分影响土壤呼吸，并且影响差异因植被类型不同而不同。生态系统日CO2吸收量随昼夜温差增加而增大；较大的昼夜温差导致较高的净CO2交换量；植物反射率与CO2通量之间存在负相关关系。 |
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其他语种文摘
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Carbon dioxide fluxes of Kobresia humilis and Potentilla fruticosa meadows,two typical ecosystems in Qinghai-Tibet Plateau,were measured by eddy covariance technology and the data collected in August 2003 were employed to analyze the relations between carbon dioxide fluxes and environmental factors and keep stable,and during the period the net carbon absorptions of Kobresia hurnilis and Potentilla fruticosa meadows reach 56.2 g C·m^-2 and 32.6 g C· m^-2 with their highest daily carbon dioxide absorptions standing at 12.7 μmol·m^-2·s^-1 and 9.3 μmol·m^-2·s^-1,and their highest carbon discharges arriving at 5.1 μmol·m^-2·s^-1and 5.7 μmol·m^-2·s^-1,respectively. At the same photosynthetic photo flux densities （PPFD）,the carbon dioxide-up-taking rate of Kobresia hurnilis meadow is higher than that of Potentilla fruticosa meadow;where the photosynthetic photo flux densities （PPFD） are higher than 1200 μmol·m^-2·s^-1,the carbon dioxide up-taking rates of the two ecosystems declined with increased air temperature, but the carbon dioxide rate of Kobresia hurnilis meadow decreased more quickly （-0. 086） than that of Potentilla fruticosa meadow （-0. 016）. The soil moistures exert influence on the soil respirations and the influences vary with the vegetation types. The daily carbon dioxide absorptions of the ecosystems increase with increased diurnal temperature differences and carbon dioxide exchanges. There exists a negative bon dioxide fluxes. higher diurnal temperature differences results in higher correlation between the vegetation albedos and the carbon dioxide fluxes. |
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来源
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西北植物学报
,2006,26(1):133-142 【核心库】
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关键词
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高寒草甸
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植被类型
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生态系统净CO2交换量
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涡度相关法
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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, 西宁, 810001
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日本国立环境研究所, 日本
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日本农林环境技术研究所, 日本
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中国科学院地理科学与资源研究所, 北京, 100101
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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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1000-4025 |
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学科
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植物学 |
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基金
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中国科学院知识创新工程项目
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国家973计划
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文献收藏号
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CSCD:2329382
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