南方农业学报2012，Vol.43Issue(6)：797-801,5.DOI:10.3969/j:issn.2095-1191.2012.06.797
基于氮磷释放的水稻灌区塘堰湿地底泥净化能力分析
Analysis of purification capacity of sediment in pond wetland based on the release of nitrogen and phosphorus in rice irrigation area
摘要
Abstract
[Objective]The release of nitrogen and phosphorus in sediment from pond wetlands under different environmental conditions was investigated for better use of wetland in rice paddy drainage. [ Method ]Two typical pond wetlands similar in physical and chemical characters were selected in Zhanghe Irrigation Area, Hubei Province. Effects of the release of nitrogen and phosphorus on water quality of overlying water were studied by means of static imitation. [Result] The results showed that the flow turbulence accelerated the release of phosphorus from sediment. Unstable water-soil environment and the content of dissolved oxygen affected the growth of microorganisms and the rate of nitrification/denitrification. Nice aerobic-anaerobic environment in the root zone was tremendously paramount for maintaining the purification capacity of wetland. For different water quality indicators, the appropriate water depth of wetland was different. As for total phosphorus, the purification effect was better when the water depth was 45 cm,and for total nitrogen,the better water depth was 25 cm. [Conclusion]Optimal water depth in pond wetland of rice irrigation area should be determined by wetland features,water quality and purification demands.When the nutrients in sediment accumulated to a certain extent, secondary pollution may occur. Accordingly the periodic dredging was key to ensure the treatment capacity and stable operation of wetland.关键词
水稻灌区/塘堰湿地/底泥/水体净化/氮磷释放Key words
rice irrigation area/ pond wetland/ sediment/ water purification/ release of nitrogen and phosphorus分类
农业科技引用本文复制引用
万玉文..基于氮磷释放的水稻灌区塘堰湿地底泥净化能力分析[J].南方农业学报,2012,43(6):797-801,5.基金项目
国家自然科学基金项目(50839002) （50839002）
广西高校科研项目(200103YB184) （200103YB184）
