The Temporal Dynamics of Carbon Dioxide under Snow in a High Elevation Rocky Mountain Subalpine Forest and Meadow
The Temporal Dynamics of Carbon Dioxide under Snow in a High Elevation Rocky Mountain Subalpine Forest and Meadow
复制标题
高海拔落基山亚高山森林和草甸雪下二氧化碳的时间动态
DOI：
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发表时间：
2005
期刊：
影响因子：
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通讯作者：
J. Korfmacher
中科院分区：
文献类型：
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作者：
R. Musselman;W. Massman;J. Frank;J. Korfmacher
摘要在怀俄明州海拔3100 m的亚高山地区，通过两个冬季对雪下二氧化碳（CO2）浓度进行了研究。在土壤/雪界面每半小时监测一次CO2，第二年在大约-25厘米的土壤深度，在草地和邻近的森林中。草甸雪下CO2浓度显著高于森林。土壤中-25 cm深度的CO2明显高于土壤表面的CO2。雪下的CO2随着雪的融化而迅速增加，春季开始融雪。雪下的CO2浓度主要取决于发生在前24或48小时的量。而CO2浓度则与雪深和土壤温度有关，并间接与季节性环境因子，特别是太阳辐射有关。太阳辐射、雪深和雪下的二氧化碳都随着冬季的进展而同时增加。CO2通量始终高于在草甸比在森林中，并增加在这两个网站的冬末。积雪覆盖的亚高山草甸和森林在冬季向大气中排放了大量的二氧化碳。
Abstract Carbon dioxide (CO2) concentration under snow was examined through two winter seasons at a 3100 m elevation subalpine site in the Snowy Range of Wyoming. CO2 was monitored every half hour at the soil/snow interface, and at about −25 cm soil depth the second year, in a meadow and in an adjacent forest. CO2 under snow in the meadow was significantly higher than that in the forest. CO2 at −25 cm depth in the soil was significantly higher than soil surface CO2. The CO2 under snow increased rapidly as snow melted and snowmelt began in the spring. CO2 concentration under snow depended primarily on amount occurring during the previous 24 or 48 h. However, CO2 concentration was related to snow depth and soil temperature, and indirectly to several seasonal environmental factors, especially solar radiation. Solar radiation, snow depth, and CO2 under snow all increase concurrently as the winter season progresses. CO2 flux was consistently higher in the meadow than in the forest and increased in late winter for both sites. Snow covered subalpine meadows and forests contribute considerable amounts of CO2 to the atmosphere in the winter.