文献类型：期刊文献

英文题名：Sediment phosphorus cycling in a nutrient-rich embayment in relation to sediment phosphorus pool and release

作者：Jin, Guangzhe[1,2];Onodera, Shin-ichi[3];Saito, Mitsuyo[4];Shimizu, Yuta[5]

机构：[1]Guangdong Ocean Univ, Coll Ocean & Meteorol, Rd 1 Mazhang, Zhanjiang 524088, Peoples R China;[2]Hiroshima Univ, Grad Sch Integrated Arts & Sci, C611,1-7-1 Kagamiyama, Higashihiroshima, Hiroshima 7398521, Japan;[3]Hiroshima Univ, Grad Sch Adv Sci & Engn, C611,1-7-1 Kagamiyama, Higashihiroshima, Hiroshima 7398521, Japan;[4]Okayama Univ, Grad Sch Environm & Life Sci, 3-1-1 Tsushima Naka, Okayama 7008530, Japan;[5]Natl Agr & Food Res Org, Western Reg Agr Ctr, 6-12-1 Nishifukatsu, Fukuyama, Hiroshima 7218514, Japan

年份：2020

卷号：21

期号：3

起止页码：415

外文期刊名：LIMNOLOGY

收录：SCI-EXPANDED(收录号：WOS:000539977500001)、、Scopus(收录号：2-s2.0-85086385148)、WOS

基金：The authors appreciate the help of Professor M. Fukuoka from Hiroshima University with this research and thank K. Kitaoka and Y. Moriyama from Okayama University of Science and Y. Kato from Hiroshima University for assistance with the field observations. This work was supported by a Grant-in-Aid for Scientific Research from the Ministry of Education, Culture, Sports, Science and Technology of Japan (PI: M. Fukuoka"(https://kaken.nii.ac.jp/d/p/21241011.en.html).

语种：英文

外文关键词：Phosphorus; Phosphorus budgets; Eutrophication recovery; Sediment; Internal release

外文摘要：A semi-enclosed river-mouth bay (Kojima Bay) and the artificial lake within it (Kojima Lake) were studied to examine their nutrient storage and export processes and characteristics. The aim of this study was to perform mass balance analysis using long-term monitoring and historical accumulation data of phosphorus (P) via(210)Pb measurements of accumulated sediment. The results are then compared with data based on analysis of P concentrations in core samples to delineate input and output nutrient fluxes in a semi-enclosed bay and an artificial lake, in order to evaluate if the lake sediment is a source or sink of P during the transportation process from the river to the bay. From 1980 to 2008, total P flux into the lake is 3520 tons. The lake sediment phosphorus retention estimated by the model (383 tons) was lower than that obtained by multiplying the average total P concentration in sediment samples by the sediment accumulation rate (1288 tons), possibly indicating that recycling from sediments deposited before 1980 contributed to the recent P cycle. The implication for these data is that the severe eutrophication of the lake in the 1970s led to greatly elevated P levels. The inner artificial lake had a significant amount of trapped P, and the production of diatoms increased in response to P enrichment in lake water, an initial sign of eutrophication. The modeled annual P flux into the lake sediments decreased from similar to 15 g m(-2) yr(-1)(a flux into the sediment) in 1980 to negative values (a flux out of sediment) by 2008. The decreasing trend of nutrients accumulating in lake sediments suggests the lake is slowly recovering from eutrophication, especially since the 1990s.