Preliminary Study on Nitrogen and Phosphorus Releases from Creek sediments in Shanghai Suburbs

摘要

A laboratory study was conducted to observe the release of nitrogen and phosphorus from the sediments under both anaerobic and aerobic conditions. The samples used were five creek sediments and a fish-pond sediment (as a comparison) obtained from suburban Shanghai. High loads of nitrogen and phosphorus were found in the creek sediments. Total nitrogen of the sediments ranged form 1.17 to 5.95 g kg~-1; total phosphorus from 608.63 to 2 033.95 mg kg~-1. Making up more than 90/100 of the total nitrogen, organic nitrogen was the dominant nitrogen fraction in the sediments; whereas inorganic phosphorus was the dominant phosphorus fraction, which made up more than 85 percent of the total phosphorus. Ca-bound phosphorus fraction dominated inorganic phosphorus, which occupied more than 50/100 of the total.