Mechanism of phosphorus mobility in sediments with larval (Propsilocerus akamusi) bioturbation

	Mechanism of phosphorus mobility in sediments with larval (Propsilocerus akamusi) bioturbation
	Yan, Wenming; Chen, Musong; Liu, Ling; Wu, Tingfeng; Zhang, Yi; Wang, Han; Xigang, Xing; Fan, Kongming
刊名	ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
	2020
卷号	27 期号:7 页码:7538-7548
英文摘要	The effects of chironomid larval (Propsilocerus akamusi) bioturbation on sediment phosphorus (P) mobility were studied over the course of 34 days using the indoor larval cultivation method on in situ sediment cores. High-resolution dialysis (HR-Peeper) and diffusive gradients in thin films (DGT) techniques were used to record fine-scale changes of soluble and DGT-labile P and iron (Fe) concentrations in the sediment. The larval-driven irrigation of the overlying water into their burrows significantly increased the oxygen penetration depth (OPD) and redox state (Eh) in sediments. In addition, the soluble and DGT-labile P and Fe decreased with the increase of OPD and Eh in larval-bioturbated sediments. The greatest decrease in the mean concentration of SRP, soluble Fe, and DGT-labile P in the Propsilocerus group was observed on Day 15 of the experiment, with a decrease by over half of the mean concentration of the control group. Furthermore, two-dimensional measurements of DGT-labile P concentration showed notable reductions of DGT-labile P around larval burrows. The DGT-induced fluxes in sediments (DIFS) model also exhibited a much longer response time (420 s) and a much higher rate of P adsorption (0.002 s(-1)) in the bioturbation sediments than those in the control sediments (116 s and 0.009 s(-1), respectively). A significant correlation was shown for DGT-labile P and DGT-labile Fe. We conclude that Fe(II) oxidation and its enhanced adsorption were the major mechanisms responsible for the decrease of soluble and DGT-labile P in sediments.
内容类型	期刊论文
源URL	[http://159.226.73.51/handle/332005/20208]
专题	中国科学院南京地理与湖泊研究所
推荐引用方式 GB/T 7714	Yan, Wenming,Chen, Musong,Liu, Ling,et al. Mechanism of phosphorus mobility in sediments with larval (Propsilocerus akamusi) bioturbation[J]. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH,2020,27(7):7538-7548.
APA	Yan, Wenming.,Chen, Musong.,Liu, Ling.,Wu, Tingfeng.,Zhang, Yi.,...&Fan, Kongming.(2020).Mechanism of phosphorus mobility in sediments with larval (Propsilocerus akamusi) bioturbation.ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH,27(7),7538-7548.
MLA	Yan, Wenming,et al."Mechanism of phosphorus mobility in sediments with larval (Propsilocerus akamusi) bioturbation".ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH 27.7(2020):7538-7548.