水产学报2017，Vol.41Issue(7)：1116-1125,10.DOI:10.11964/jfc.20151210205
持续充氧对养殖池塘上覆水—泥水界面—沉积物间隙水中离子垂直分布的影响
Effect of aeration on vertical distribution of the ions in overlying and interstitial waters of microcosms paved with aquaculture sediment
摘要
Abstract
In order to study the effect of aeration on vertical distribution of the ions in overlying and interstitial waters in aquaculture systems, we constructed 8 plexiglass microcosms paved with aquaculture sediment, including 4 tests with continuous aeration and 4 controls without aeration. Intact overlying and interstitial waters were collected by Peeper (pore water equilibriums) devices on the days of 0, 1, 4 and 7 respectively, before and after initiating the aeration. The ions of NH4+-N, NO3--N, NO2--N, PO43--P and SO42--S were measured by miniaturized photometrical methods using a microplate reader. The result showed that one week aeration didn't significantly change the vertical distribution of NH4+-N in interstitial and overlying waters, but it greatly increased the concentration of NO3--N in overlying and 0–2 cm interstitial waters. The highest average concentration of NO2--N presented in surface layer waters before the aeration, while it peaked in the surface sediment interstitial waters at the depth of 1 cm during the aeration. The aeration promoted the adsorption and immobilization of PO43--P in the sediment, greatly decreased the concentration of PO43--P in overlying and 0–2 cm interstitial waters. The concentration of SO42--S in overlying and 0–2 cm interstitial waters was significantly increased by oxidizing reducible sulfur in biological and chemical path. The physicochemical property of the overlying water on 1 d, 4 d, 7 d was greatly changed, which distanced farthest away from the control group, suited at the bottom of the PCA image. On the contrary, it didn't distinctively chang the property of the sediment interstitial waters, which suited at the left site of the PCA image. In conclusion, aeration conditions can elevate oxidative ions of NO3--N, NO2--N and SO42--S, and reduce the ions of PO43--P which can cause eutrophication. It greatly changes the physicochemical property of the overlying water and surface sediment interstitial waters, which is an applicable method to control aquaculture pond water quality and remediate sediment.关键词
池塘养殖/充氧/离子/沉积物间隙水/上覆水Key words
aquaculture in ponds/aeration/ions/overlying water/interstitial water分类
农业科技引用本文复制引用
魏南,余德光,王广军,谢骏..持续充氧对养殖池塘上覆水—泥水界面—沉积物间隙水中离子垂直分布的影响[J].水产学报,2017,41(7):1116-1125,10.基金项目
国家科技支撑计划(2012BAD25B04) （2012BAD25B04）
广州市珠江科技新星专项(2014J2200088)National Key Technology R & D Program of China (2012BAD25B04) （2014J2200088）
Pearl River Nova Program of Guangzhou (2014J2200088) （2014J2200088）
