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OALib Journal期刊
ISSN: 2333-9721
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若尔盖高寒草地沙化过程碳通量的变化特征
DOI: 10.3724/SP.J.1145.2015.02028, PP. 954-959
Keywords: 若尔盖高原,高寒草地,沙化,碳通量,季节动态,日动态
Abstract:
为了解若尔盖高原高寒草地沙化过程生态系统中co2的收支变化，利用li-840静态箱法于2013年生长季（5-10月），在一处典型沙化区域，分别调查未沙化（un）、中度沙化（mo）和重度沙化（se）草地的生态系统净通量（nee）、生态系统呼吸（er）和土壤呼吸（sr）的季节和日动态变化.结果显示：若尔盖高寒草地未沙化草地和中度沙化草地nee季节变化呈单峰状，中度沙化草地波动性增强，而重度沙化草地在整个生长季节变化不明显.未沙化草地在生长季节日间瞬时nee为-3.33?molm-2s-1，中度沙化草地为-2.06?molm-2s-1，是未沙化草地的61.86%，严重沙化草地为-0.62?molm-2s-1，是未沙化草地的18.61%.在沙化过程中，土壤所贡献给生态系统整体的呼吸占比，从72.90%增加到79.28%，季节变化动态呈现出与系统呼吸相似的变化规律.未沙化草地在生长季节的初期和中期均呈现出较强的碳汇特性，固碳速率分别为9.05gm-2d-1和28.70gm-2d-1，而在末期呈现出微弱碳源.本研究表明，沙化使得高寒草地在生长季节由微弱的碳汇转变成为碳源，固碳能力严重削弱.
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