南京林业大学学报（自然科学版）2017，Vol.41Issue(6)：127-133,7.DOI:10.3969/j.issn.1000-2006.201609062
不同溶氧条件大薸腐解过程的水质效应
Effects of decomposition of Pistia stratiotes on water quality under different dissolvedoxygen conditions
摘要
Abstract
[Objective]Understanding the differences in the decomposition of aquatic plants and water quality under dif-ferent dissolved-oxygen levels plays an important role in plant residue management and water-quality control. [Method]A eutrophic aquatic environment was simulated using a plastic box with Pistia stratiotes under conditions of non-inflated aer-ation (NA) and inflated aeration (IA).Under indoor and low-light conditions, water-quality indices were determined at different time points. Changes in the major water-quality indices during the decomposition of Pistia stratiotes were ana-lyzed.[Result]Plant residue decomposed faster in the IA group than the NA group;however, the water-quality indices changed synchronously. The major water-quality indices in the initial decomposition stage(1-25 d) changed considera-bly, and was relatively stable in the subsequent stages (26-95 d).In the initial stage, the concentrations of NO-3 -N and NO-2 -N remained significantly higher in the IA group than the NA group, and the concentration of PO3-4 -P remained lower in the IA group than the NA group;in the subsequent stages,in addition to NH+4 -N, values of the major indices were lower in the IA group than the NA group. In the IA group,the major water-quality indices reached maximum values simultaneously among different biomass levels. In the NA group, there was a delay in attaining maximum concentrations of NO-3 -N, NO-2 -N, and PO3-4 -P,and the period of delay increased as the initial amount of plant biomass increased, particularly observable in variation in PO3-4 -P concentration.[Conclusion]Generally, comparing with the effect of plant biomass, inflated aeration had a greater impact on water quality. Under the IA condition, the values of the major water-quality indices were higher than those in the NA group. There were significant differences in water quality between the two groups,especially at the initial stage of the study;however,at subsequent stages,the influence of inflated aeration on water quality indices was relatively small.关键词
水生植物/分解/充气/水质效应/水藻Key words
aquatic plant/decomposition/aeration/water quality/Pistia stratiotes分类
资源环境引用本文复制引用
喜文娟,刘京,王薇,牛宇琛,徐驰,刘茂松..不同溶氧条件大薸腐解过程的水质效应[J].南京林业大学学报（自然科学版）,2017,41(6):127-133,7.基金项目
国家水体污染控制与治理科技重大专项(2012zx07101013) （2012zx07101013）
国家自然科学基金项目(41271197,51309242) （41271197,51309242）
