文献类型：期刊文献

英文题名：The impact of algal blooms on promoting in-situ N 2 O emissions: A case in Zhanjiang bay, China

作者：Cai, Shangjun[1,2];Lao, Qibin[1,2];Chen, Chunqing[1,2];Zhu, Qingmei[1,2,3,4];Chen, Fajin[1,2,3,4]

机构：[1]Guangdong Ocean Univ, Coll Ocean & Meteorol, Zhanjiang 524088, Peoples R China;[2]Guangdong Ocean Univ, Sch Chem & Environm, Zhanjiang 524088, Peoples R China;[3]Guangdong Ocean Univ, Key Lab Coastal Ocean Variat & Disaster Predict, Zhanjiang 524088, Peoples R China;[4]Guangdong Ocean Univ, Key Lab Climate Resources & Environm Continental S, Dept Educ Guangdong Prov, Zhanjiang 524088, Peoples R China

年份：2024

卷号：358

外文期刊名：JOURNAL OF ENVIRONMENTAL MANAGEMENT

收录：SCI-EXPANDED(收录号：WOS:001233664600001)、、EI(收录号：20241715954797)、Scopus(收录号：2-s2.0-85190744282)、WOS

基金：This study was supported by the National Natural Science Foundation of China (92158201, 42276047) , Entrepreneurship Project of Shantou (2021112176541391) , Scientific Research Start-Up Foundation of Shantou University (NTF20006) , Guangdong Provincial College Innovation Team Project (2019KCXTF021) .

语种：英文

外文关键词：15N isotope; Algal bloom; Nitrification-denitrification; Nitrous oxide emission; Zhanjiang bay

外文摘要：Under the influence of many factors, such as climate change, anthropogenic eutrophication, and the development of aquaculture, the area and frequency of algal blooms have showed an increasing trend worldwide, which has become a challenging issue at present. However, the coupled relationship between nitrous oxide (N 2 O) and algal blooms and the underlying mechanisms remain unclear. To address this issue, 15 N isotope cultures and quantitative polymerase chain reaction (qPCR) experiments were conducted in Zhanjiang Bay during algal and nonalgal bloom periods. The results showed that denitrification and nitrification-denitrification were the two processes responsible for the in -situ production of N 2 O during algal and non-algal bloom periods. Stable isotope rate cultivation experiments indicated that denitrification and nitrification-denitrification were promoted in the water during the algal bloom period. The in -situ production of N 2 O during the algal bloom period was three-fold that during the non-algal bloom period. This may be because fresh particulate organic matter (POM) from the organisms responsible for the algal bloom provides the necessary anaerobic and hypoxic environment for denitrification and nitrification-denitrification in the degradation environment. Additionally, a positive linear correlation between N 2 O concentrations and ammonia-oxidizing bacteria (AOB) and denitrifying bacteria ( nirK and nirS ) also supported the significant denitrification and nitrification-denitrification occurring in the water during the algal bloom period. However, the algal bloom changed the main process for the in -situ production of N 2 O, wherein it shifted from denitrification during the non-algal bloom period to nitrification-denitrification during the algal bloom period. The results of our study will improve our understanding of the processes responsible for the in -situ production of N 2 O during the algal bloom period, and can help formulate effective policies to mitigate N 2 O emissions in the bay.