本文選題：長江口 + 懸浮顆粒物��； 參考：《中國海洋大學(xué)學(xué)報(自然科學(xué)版)》2016年02期

【摘要】：對河流顆粒有機碳的來源和歸宿的認識是全球碳循環(huán)研究的重要方面,而從分級的角度研究顆粒有機碳的輸運過程,有助于深入了解其遷移轉(zhuǎn)化過程。于2012年3月采集了長江口的表層懸浮顆粒物,采用水淘選法對其進行了分級分離,分析了這些顆粒物的有機碳含量、穩(wěn)定碳同位素豐度及木質(zhì)素等參數(shù),結(jié)合顆粒物的質(zhì)量百分組成,討論了不同粒級顆粒物有機碳的分布、來源及降解情況。從質(zhì)量分布上來說,長江口懸浮顆粒物的主要組成部分是32μm粒級的顆粒物。隨粒徑增大,顆粒有機碳的含量逐漸降低,但并不是最小粒級賦存最多的有機碳,大部分站位顆粒有機碳集中在16~32μm粒級顆粒物上(55%以上)。粗顆粒物(63μm)中有機碳含量低,N/C比較小,13 C較虧損,木質(zhì)素含量較高,說明粗顆粒物中陸源有機碳的貢獻較大,而在細顆粒物,尤其是8μm和8~16μm顆粒物中,除δ13 C外,其它參數(shù)的變化均與粗顆粒物的相反,其13 C則比粗顆粒物還要虧損,說明在這些粒級中,除了陸地高等植物外,土壤有機碳或淡水浮游植物的貢獻可能也很重要。長江口不同粒級懸浮顆粒物的C/V值和S/V值均較小,表明顆粒物中木質(zhì)素是被子植物組織與裸子植物組織的混合來源。隨粒徑增大,木質(zhì)素降解參數(shù),如(Ad/Al)v、P/(S+V)和3,5-Bd/V均逐漸降低,表明細顆粒物中木質(zhì)素的降解程度最高。
[Abstract]:Understanding the origin and fate of particulate organic carbon in rivers is an important aspect in the study of the global carbon cycle, and studying the transport process of particulate organic carbon from the perspective of classification is helpful to further understand the migration and transformation process of particulate organic carbon. The suspended particles in the surface layer of the Yangtze Estuary were collected in March 2012 and separated by water scouring method. The organic carbon content, stable carbon isotope abundance and lignin of these particles were analyzed. The distribution, source and degradation of organic carbon in different particles were discussed in combination with the mass percent composition of particulate matter. In terms of mass distribution, the main component of suspended particles in the Changjiang Estuary is 32 渭 m particles. With the increase of particle size, the content of particulate organic carbon decreased gradually, but it was not the most abundant organic carbon at the smallest grain level, and most of the particulate organic carbon at the station was concentrated on 16 ~ 32 渭 m particles (55% or more). The content of organic carbon in coarse particulate matter (63 渭 m) was lower than that in small N / C ratio of 13C, and the content of lignin was higher, which indicated that the contribution of terrestrial organic carbon in coarse particulate matter was greater, but in fine particulate matter, especially in 8 渭 m and 816 渭 m particulate matter, except 未 13 C. The change of other parameters is contrary to that of coarse particulate matter, and its 13C is lower than that of coarse particulate matter, indicating that the contribution of soil organic carbon or freshwater phytoplankton may also be important in these grain-level, in addition to the terrestrial higher plants, the contribution of soil organic carbon or freshwater phytoplankton may also be very important. The C / V and S / V values of suspended particles of different grain levels in the Changjiang Estuary were small, which indicated that lignin in particles was the mixed source of angiosperm and gymnosperms. The degradation parameters of lignin, such as (Ad/Al) V P / (S V) and (35 B / V), gradually decreased with the increase of particle size, indicating that the degradation degree of lignin in fine particles was the highest.
【作者單位】： 中國海洋大學(xué)海洋化學(xué)理論與工程技術(shù)教育部重點實驗室;中國海洋大學(xué)化學(xué)化工學(xué)院;海洋科學(xué)與技術(shù)青島協(xié)同創(chuàng)新中心;中國海洋大學(xué)海洋有機地球化學(xué)研究所;
【基金】：國家自然科學(xué)基金項目(41176063;41221004)資助~~
【分類號】：P734

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