田锴,张成,杨锦霞,沈萌荷,李雨霖,王雪

• 1:南阳师范学院生命科学学院
• 2:河南省南水北调中线渠首湿地生态系统野外科学观测研究站
• 3:南阳师范学院水资源与现代农业学院

摘要(Abstract)：

丹江口水库是南水北调中线工程的水源地。自2021年首次满蓄调水以来，水库新生消落区面临多种自然和人为因素干扰，当前对其CO_2释放规律与特征的认知尚属空白。本研究聚焦中线工程渠首湿地，通过对7个样地的21个样方的实地观测，探明了2023年度消落区土壤CO_2的排放特征：(1)中线渠首消落区非淹没时段土壤呼吸的CO_2年排放量为(18.79±3.50) t·hm~(-2),CO_2释放通量自生长季初期逐渐升高，各样地的平均峰值出现在8月23日(4.056μmol·m~(-2)·s~(-1)),在夏末秋初水位上涨时开始下降；(2)水分是驱动中高水位消落区及周边非消落区内次生林土壤呼吸变化的首要因素，CO_2排放波动与这些区域的湿度变化动态高度一致；(3)低高程消落区的土壤呼吸不受干旱限制，土壤温度和植被类型是影响其CO_2排放的主要因素。作为丹江口水库消落区土壤CO_2释放通量的首次观测，揭示了人工调水与自然环境共同塑造大型水库消落区碳排放的规律特征，为该区生态系统功能恢复研究和管理实践提供了重要参考。

关键词(KeyWords)： 丹江口水库;土壤呼吸通量;消落区;时空格局;干扰

Abstract:

Keywords:

基金项目(Foundation): 河南省高等学校重点科研项目(25A180013);; 南阳师范学院自然科学类博士科研启动金项目(208203)

作者(Author): 田锴,张成,杨锦霞,沈萌荷,李雨霖,王雪

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