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本文以木质素为示踪物,认识陆源有机碳在黄河口潮间带的降解和输送特征。现场调查和样品采集进行于2012年5月、8月和11月,以及2013年3月。结果表明:黄河口潮间带有机碳含量为0.06%~0.40%,δ~(13)C变化范围为-24.4‰~-20.4‰,表现为陆海混合来源特征;木质素Σ8含量范围为0.13~0.54 mg/10g dw,均值为0.23 mg/10g dw,由黄河口门向南北递减;Λ8为0.49~2.42 mg/100 mg OC,均值为1.35 mg/100 mg OC,由南向北逐渐降低;木质素主要来源为被子植物草本和木本组织,草本和木本组织的相对贡献呈现季节变化;木质素通过氧化和去甲基/甲氧基2种过程降解,其中去甲基/去甲氧基降解作用更强,降解水平处于中等偏强。
In this paper, lignin as tracer, understanding of terrestrial organic carbon in the intertidal zone of the Yellow River estuary degradation and transport characteristics. Field surveys and sample collection were conducted in May, August and November 2012, and March 2013. The results showed that the content of organic carbon in the intertidal zone of the Yellow River Estuary was 0.06% ~ 0.40%, and the δ ~ (13) C ranged from -24.4 ‰ to -20.4 ‰, which was characterized by mixed sources of land and sea. The Σ8 content of lignin ranged from 0.13 ~ 0.54 mg / 10g dw, with an average of 0.23 mg / 10g dw, decreasing from north to south of the Yellow River mouth; Λ8 was 0.49 ~ 2.42 mg / 100 mg OC with a mean value of 1.35 mg / 100 mg OC, decreasing gradually from south to north; The main sources of lignin were angiosperm herbaceous and woody tissues, and the relative contribution of herbaceous and woody tissues presented seasonal changes. Lignin was degraded by oxidative and demethylation / Base degradation is stronger, the degradation level is moderately strong.