Historical eutrophication in the Changjiang and Mississippi delta-front estuaries: Stable sedimentary chloropigments as biomarkers

被引:30
作者
Zhao, Jun [1 ,2 ]
Bianchi, Thomas S. [1 ]
Li, Xinxin [1 ,3 ]
Allison, Mead A. [4 ]
Yao, Peng [3 ,5 ]
Yu, Zhigang [3 ,5 ]
机构
[1] Texas A&M Univ, Dept Oceanog, College Stn, TX 77843 USA
[2] Ocean Univ China, Minist Educ, Key Lab Marine Environm & Ecol, Qingdao 266100, Peoples R China
[3] Ocean Univ China, Minist Educ, Key Lab Marine Chem Theory & Technol, Qingdao 266100, Peoples R China
[4] Univ Texas Austin, Inst Geophys, Austin, TX 78758 USA
[5] Ocean Univ China, Coll Chem & Chem Engn, Inst Marine Organ Geochem, Qingdao 266100, Peoples R China
基金
美国海洋和大气管理局; 中国国家自然科学基金;
关键词
Large-river delta-front estuary; Changjiang river; Mississippi river; Eutrophication; Sedimentary chloropigments; Biomarkets; GULF-OF-MEXICO; YANGTZE-RIVER; LOUISIANA SHELF; ORGANIC-CARBON; EAST CHINA; PHYTOPLANKTON COMMUNITY; COASTAL EUTROPHICATION; SURFACE SEDIMENTS; EARLY DIAGENESIS; CHLOROPHYLL-A;
D O I
10.1016/j.csr.2012.07.005
中图分类号
P7 [海洋学];
学科分类号
0707 ;
摘要
Eutrophication is one of the most significant ecological problems in large-river delta-front estuaries (LDEs) around the world. We used TOC, TN, delta C-13, delta N-15 and three stable sedimentary chloropigments (pyropheophytin-a [pPHtin-a], sterol chlorin esters [SCEs] and carotenol chlorin esters [CCEs]) as geochemical proxies to examine historical trends of eutrophication over the last few decades in the Changjiang and Mississippi LDEs. Concentrations of sedimentary pPHtin-a, SCEs and CCEs increased from 15,12 and 120 nmol g(-1) OC in 1960s to 51, 32 and 256 nmol g(-1) OC in 1990s on the inner shelf of the East China Sea, respectively, and from 57, 69 and 31 nmol g(-1) OC in 1950s to 70, 90 and 44 nmol g(-1) OC in 2000s in the Mississippi Canyon, respectively. Riverine loading of DIN flux to LDE increased from (261 +/- 109) x 10(6) kg yr(-1) in pre-1980 to (1385 +/- 209) x 10(6) kg yr(-1) in post-1990 in the Changjiang LDE, while nitrate flux increased from (322 +/- 89) x 10(6) kg yr(-1) in the 1950s to 1960s to (589 +/- 123) x 10(6) kg yr(-1) in the 1970s, and DIN flux kept relatively stable in (963 +/- 250) x 10(6) kg yr(-1) from the 1980s to 2000s in the Mississippi LDE. This work reveals that the stable sedimentary chloropigments in accumulating sediments on the inner shelf are suitable biomarkers for examining past changes in eutrophication in the Changjiang and Mississippi LDE ecosystems. The historical record of riverine nutrient inputs as related to changes in the watershed (e.g., fertilizers and manure) is wellcorrelated with down-core concentrations of stable pheopigment biomarkers in sediments at both LDEs. These results support the coupling between enhanced phytoplankton abundance and increasing anthropogenic nutrients input to the inner shelves of these LDEs. (c) 2012 Elsevier Ltd. All rights reserved.
引用
收藏
页码:133 / 144
页数:12
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