文献类型：期刊文献

英文题名：Role of carbon and nutrient exports from different land uses in the aquatic carbon sequestration and eutrophication process

作者：Bao, Qian Liu, Zaihua Zhao, Min Hu, Yundi Li, Dong Han, Cuihong Zeng, Cheng Chen, Bo Wei, Yu Ma, Song Wu, Yang Zhang, Yi

第一作者：Bao, Qian

通信作者：Liu, ZH[1]

机构：[1]Chinese Acad Sci, State Key Lab Environm Geochem, Inst Geochem, Guiyang 550081, Peoples R China;[2]Univ Chinese Acad Sci, Beijing 100049, Peoples R China;[3]Chinese Acad Sci, Chinese Ecosyst Res Network, Puding Karst Ecosyst Res Stn, Puding 562100, Guizhou, Peoples R China;[4]CAS Ctr Excellence Quaternary Sci & Global Change, Xian 710061, Peoples R China;[5]China Univ Geosci Beijing, Sch Water Resources & Environm, Beijing 100083, Peoples R China;[6]Guizhou Inst Technol, Resources & Environm Engn, Guiyang 550008, Guizhou, Peoples R China

第一机构：Chinese Acad Sci, State Key Lab Environm Geochem, Inst Geochem, Guiyang 550081, Peoples R China

通信机构：corresponding author), Chinese Acad Sci, State Key Lab Environm Geochem, Inst Geochem, Guiyang 550081, Peoples R China.

年份：2022

卷号：813

外文期刊名：SCIENCE OF THE TOTAL ENVIRONMENT

收录：;EI(收录号：20214811255904);Scopus(收录号：2-s2.0-85120162052);WOS:【SCI-EXPANDED(收录号:WOS:000767233400005)】；

基金：This study was financially supported by the National Natural Science Foundation of China (42130501, 42177248, U1612441, and 41921004) , the Strategic Priority Research Program of Chinese Academy of Sciences (XDB40020000) and the Natural Science Foundation of Guizhou Province ( [2020] 1Y412) , Youth Science and Technology Talent Growth Program of Guizhou Provincial Education Department (Grant No. KY [2021] 137) and Guizhou Science and Technology Department Fund (Grant No. [2021] 456) . Special thanks are given to Prof. Dr. Derek Ford (McMaster University, Canada) for his thoughtful comments and cor-rections, which greatly improved the original draft.

语种：英文

外文关键词：Land uses; Phytoplankton; Submerged plants; C-N-P limitation; Autochthonous OC sequestration; Mitigating eutrophication

摘要：The hydrochemical features affected by differing land uses play a key role in regulating both the primary production of aquatic photosynthetic organisms and the formation of autochthonous organic carbon (AOC); this impacts eutrophication and the global carbon cyde. In shallow water environments where phytoplankton and submerged plants coexist, the C-N-P limitations on the primary production of these aquatic organisms, and the mechanisms by which they promote the formation of AOC are poorly understood. In this study, over the hydrological year September 2018 to August 2019, a large-scale field simulation experiment at the Shawan Karst Test Site (SW China) with various types of land use was systematically conducted to investigate the C-N-P limitations on the primary production of phytoplankton and submerged plants. The results indicate that (1) phytoplankton are co-limited by nitrogen (N) and phosphorus (P) but with the N more important, while submerged plants are limited by carbon (C); (2) Chlorophyta and Bacillariophyta display a stronger competitive advantage than Cyanophyta in aqueous environments with high C but low N-P; (3) there is a seasonal difference in the contribution of phytoplankton and submerged plants to the formation of AOC, however, throughout the year, the contributions of phytoplankton (27%) and submerged plants biomass (28%) to AOC concentrations in the water were similar, combinedly accounting for approximately 17% of the formed AOC. It is concluded that natural restoration of vegetation, or injecting CO2 into water, which results in higher C but lower N-P loadings, may simultaneously help to mitigate eutrophication (with changes in biological structure and species) and increase C sequestration in surface waters. (C) 2021 Elsevier B.V. All rights reserved.