Impact of Water-Sediment Regulation on Variations of Amino Acids in the Middle-Lower Yellow River, China  

作　　者：ZHANG Kun ZOU Li DAI Qunying WANG Jian JIANG Xueyan LIANG Shengkang 

机构地区：[1]College of Environmental Science and Engineering,Ocean University of China,Qingdao 266100,China [2]Key Laboratory of Marine Environment and Ecology,Ministry of Education,Ocean University of China,Qingdao 266100,China [3]SGS-CSTC Standards Technical Services(Qingdao)Co.,Ltd.,Qingdao 266101,China [4]Key Laboratory of Marine Chemistry Theory and Technology,Ministry of Education,Ocean University of China,Qingdao 266100,China

出　　处：《Journal of Ocean University of China》2020年第2期369-376,共8页中国海洋大学学报（英文版）

基　　金：supported by the National Key Research and Development Program of China(No.2018YFC1407 601);the National Natural Science Foundation of China(No.41176064)

摘　　要：In order to examine the impacts of water-sediment regulation on regional carbon cycling,we collected water,particulate and sediment samples from the middle-lower Yellow River in late June and early July,2015 and analyzed their specific amino acids(AA),DOC,POC,and bacteria abundance.Summarized by 14 specific AA,the total hydrolysable AA(THAA),particulate AA(PAA),and sediment AA(SAA)varied in ranges of 2.29-9.05μmol L^-1,5.22-22.96μmol L^-1,and 81.7-137.19μg g^-1 dry weight.After the regulation,dissolved free AA(DFAA)decreased by 29%while DCAA increased by 72%.These variations suggested that DFAA were further degraded,while DCAA molecules were further activated.Meanwhile,PAA increased almost 4 times as many as those before regulation,and SAA increased as well.After regulation,the amounts of bioactive amino acids(Asp,Glu and Gly)increased in THAA but decreased in PAA,with little changes in SAA.The ratios of Asp/Gly in different phases increased after regulation,indicating the AA contributions were promoted by calcareous organisms rather than by siliceous organisms.Multiple correlation analysis showed that PAA was primary representatives of AA and organic carbon,followed by DCAA and POC.Moreover,bacterial reproduction played a key role in shaping the AA compositions and properties,followed by the redox condition and acid-base balance.The results of this study provided a clear evidence for the effects of water-sediment regulation on regional biogeochemistry of organic carbon in the middle-lower Yellow River.In order to examine the impacts of water-sediment regulation on regional carbon cycling, we collected water, particulate and sediment samples from the middle-lower Yellow River in late June and early July, 2015 and analyzed their specific amino acids(AA), DOC, POC, and bacteria abundance. Summarized by 14 specific AA, the total hydrolysable AA(THAA), particulate AA(PAA), and sediment AA(SAA) varied in ranges of 2.29-9.05 μmol L-1, 5.22-22.96 μmol L-1, and 81.7-137.19 μg g-1 dry weight. After the regulation, dissolved free AA(DFAA) decreased by 29% while DCAA increased by 72%. These variations suggested that DFAA were further degraded, while DCAA molecules were further activated. Meanwhile, PAA increased almost 4 times as many as those before regulation, and SAA increased as well. After regulation, the amounts of bioactive amino acids(Asp, Glu and Gly) increased in THAA but decreased in PAA, with little changes in SAA. The ratios of Asp/Gly in different phases increased after regulation, indicating the AA contributions were promoted by calcareous organisms rather than by siliceous organisms. Multiple correlation analysis showed that PAA was primary representatives of AA and organic carbon, followed by DCAA and POC. Moreover, bacterial reproduction played a key role in shaping the AA compositions and properties, followed by the redox condition and acid-base balance. The results of this study provided a clear evidence for the effects of water-sediment regulation on regional biogeochemistry of organic carbon in the middle-lower Yellow River.

关 键 词：the middle-lower Yellow River water-sediment regulation amino acids organic carbon 

分 类 号：P342[天文地球—水文科学] P59[天文地球—地球物理学]