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长白山天然次生白桦林土壤CO_2释放通量研究
Authors
李向义
林丽莎
韩士杰
Publication date
1 January 2009
Publisher
Abstract
利用静态箱/气相色谱法测定了长白山天然次生白桦林土壤二氧化碳释放通量。在生长季节的春、夏、秋三个时间段对白桦林土壤CO2释放通量测定的结果表明:白桦林土壤呼吸的日变化和不同生长季节的变化均与温度的变化有明显的相关性。白昼的土壤CO2的释放通量始终高于夜晚,但白昼土壤CO2释放通量的峰值与气温的峰值相比具有一定的滞后性。土壤CO2释放通量夏季明显高于春秋两季,凋落物层对土壤CO2释放具有一定的影响,夏季去除凋落物层后土壤CO2释放通量高于未除凋落物层时CO2释放通量,而春秋两季则出现相反的结果。通过相关分析发现,有凋落物覆盖的土壤CO2释放通量与地下5cm温度相关性最好,而去除凋落物后土壤CO2释放通量则与地表温度相关性最高
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Institutional Repository of Xinjiang Institute of Ecology and Geography, CAS
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Last time updated on 29/11/2016