Knowledge Network Node

Preliminary Study on Nitrogen and Phosphorus Releasesfrom Creek Sediments in Shanghai SuburbsEnglish Full Text

HU XUEFENG1, GAO XIAOJIANG2, CHEN ZHENLOU3, XU SHIYUAN3,SHEN MINGNENG3, WANG SHAOPING3 and HE BAOGEN41Department of Environmental Science and Engineering, Shanghai University, Shanghai 200072 (China)2Department of Envirorsmental Science and Engineering, F

Abstract: A laboratory study was conducted to observe the release of nitrogen and phosphorus from the sedimentsunder both anaerobic and aerobic conditions. The samples used were five creek sediments and a fish-pondsediment (as a comparison) obtained from suburban Shanghai. High loads of nitrogen and phosphoruswere found in the creek sediments. Total nitrogen of the sediments ranged from 1.17 to 5.95 g kg-1; totalphosphorus from 608.63 to 2 033.95 mg kg-1. Making up more than 90% of the total nitrogen, organicnitrogen was the dominant nitrogen fraction in the sediments; whereas inorganic phosphorus was the dominantphosphorus fraction, which made up more than 85 percent of the total phosphorus. Cabound phosphorusfraction dominated inorganic phosphorus, which occupied more than 50% of the total.A large amount of ammonium was released from the sediments under both aerobic and anaerobic con-ditions, and the anaerobic releases were slightly greater than the aerobic. In addition, ammonium contentsin the aerobic waters decreased sharply after reaching the peaks because of strong nitrification, comparedwith the relatively maintained ammonium peaks in the anaerobic waters. Anaerobic phosphate releases weremuch greater than the aerobic and the released ortho-phosphate was mainly from Fe-bound phosphorus.Ammonium and ortho-phosphate releases from the sample of the dredged creek were the lowest, showingthat creek dredging could effectively remove contaminants from the surface of sediments and weaken therelease potentials of nitrogen and phosphorus. Ammonium and ortho-phosphate releases from the fish-pondsediment were greater than those from the creek sediments though its total nitrogen and phosphorus werenot the highest, which was probably due to the larger amount of biologically degraded organic matter in thefish-pond sediment.
  • Series:

    (D) Agriculture

  • Subject:

    Fundamental Science of Agriculture; Agronomy

  • Classification Code:

    S153

  • Mobile Reading
    Read on your phone instantly
    Step 1

    Scan QR Codes

    "Mobile CNKI-CNKI Express" App

    Step 2

    Open“CNKI Express”

    and click the scan icon in the upper left corner of the homepage.

    Step 3

    Scan QR Codes

    Read this article on your phone.

  • HTML
  • CAJ Download
  • PDF Download

Download the mobile appuse the app to scan this coderead the article.

Tips: Please download CAJViewer to view CAJ format full text.

Download: 29 Page: 157-164 Pagecount: 8 Size: 315k

Related Literature
  • Similar Article
  • Reader Recommendation
  • Associated Author