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OALib Journal期刊
ISSN: 2333-9721
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西江河口段溶解无机碳稳定同位素组成的时空变化
DOI: 10.11821/xb200805011, PP. 553-560
Keywords: 西江河口段,溶解无机碳,稳定碳同位素
Abstract:
从2006年9月至2007年6月间对西江河口段溶解无机碳稳定同位素组成(δ13CDIC)及其相关的水体理化参数进行了一个水文年的季节性采样调查。夏、秋两季δ13CDIC平均值(-13.91‰、-13.09‰)小于春、冬季节(-11.71‰、-12.26‰),呈现出明显的季节性。δ13CDIC与温度呈负相关(p=0.000；r=-0.646),而与氧化还原电位正相关(p=0.000；r=0.569),表明河段表层水体δ13CDIC受到季节性变化的水体理化性质等河道有机质氧化分解条件的控制；夏季洪水期δ13CDIC与航测距离呈正相关,而春季枯水期的δ13CDIC与航测距离负相关。δ13CDIC的这种时空变异证明了研究河段河-海作用过程影响了水体的理化性状进而控制了河道表层水体DIC的性质。研究河段δ13CDIC的上述时空分布规律与流域所处的地理环境关系密切,汛期的夏季受陆源有机质的强烈分解作用的影响,DIC的同位素组成向海洋方向变轻；枯期的春季因海洋作用加强以及咸潮的入侵,河道DIC的同位素组成向海洋方向变重。
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