长江流域资源与环境 >> 2017, Vol. 26 >> Issue (02): 304-313.doi: 10.11870/cjlyzyyhj201702017
赵登忠1,3, 肖潇1,3, 汪朝辉1,3, 谭德宝1,3, 陈永柏2
ZHAO Deng-zhong1,3, XIAO Xiao1,3, WANG Zhao-hui1,3, TAN De-bao1,3, CHEN Yong-bo2
摘要: 为了评估大型水库对河流碳循环的拦截作用,选择清江流域最上游水布垭水库为典型案例,采用德国元素公司vario TOC分析仪对定期采集水样进行分析,研究新建大型水库水体碳时空分布特征及其影响因素。结果表明,水布垭水库表层水体总碳、总无机碳、溶解有机碳和颗粒有机碳平均含量分别为26.665、24.089、2.141和0.438 mg/L,在水库年内蓄水阶段呈现显著的峰值,其空间分布格局在支流库湾和坝前典型断面表现出显著的差异,在水体碳中总无机碳占据主导地位,与湖泊水体碳时空分布特征极为相似。由于受到人类活动和自然环境的双重影响,水体无机碳则与水体电导率指标具有较强的相关性,溶解有机碳则与水体温度具有直接的关系,而数量最少的颗粒有机碳则与水体叶绿素含量具有弱相关关系。研究成果可以为理解水库碳循环过程机制提供数据支持,对于开展大坝建设的河流碳循环影响评估具有重要参考意义。
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