应用生态学报2018，Vol.29Issue(4)：1313-1320,8.DOI:10.13287/j.1001-9332.201804.038
不同盐度对闽江河口沉积物硝化作用的影响
Effects of different salinity levels on nitrification processes in sediments of Minjiang River Estuary, China
摘要
Abstract
Two estuary wetlands in Minjiang River,Shanyutan and Daoqingzhou,were selected as the research objects.Wetland sediments were collected to examine the effects of different salinity levels on nitrification processes in the wetland with a culture experiment.The results showed that the nitrification rate of sediment in Minjiang River estuary wetland was generally low.The highest nitrification rate of sediment in the Shanyutan wetland was 0.193 mg · kg-1 · d-1,while that in the Daoqingzhou wetland did not exceed 0.050 mg · kg-1 · d-1.In the low salinity level (5),the decrease of nitrification rate was attributed to the restraint of nitrifying bacteria activities.The nitrification rate slightly increased with the increases of salinity (10),but was still lower than the initial value.This would be owed to the fact that the inhibitory effect of salinity on the activities of aerobic bacteria was strengthened,which reduced the rate of NH4+-N production,and thus resulted in a decrease of the contribution of aerobic ammonification bacteria to the apparent nitrification rate.There were regional variations in the responses of sediment nitrifying activity to salinity.In saltwater wetland (Shanyutan wetland),the adaptability of microbes in sediment to salinity was stronger,so that the nitrification activity in high salinity conditions was still higher.While in the freshwater wetland (Daoqingzhou wetland),the adaptability of the sediment to the salinity change was relatively lower,with a lower nitrification activity of the sediment in high salinity than in middle salinity.Acidic condition was the main reason for the low nitrification in the sediments of Minjiang estuary wetland.The nitrification rate and nitrification activity of the two wetlands increased first and then decreased with the duration of the culture experiment,which was driven by combined effects of initial NH4+-N concentration,oxygen content and denitrifying.关键词
闽江河口/盐度/硝化作用/短叶茳芏Key words
Minjiang River Estuary/salinity/nitrification/Cyperus tegetiformis引用本文复制引用
孙启元,李家兵,赖月婷,张党玉,邱文康,吴春山..不同盐度对闽江河口沉积物硝化作用的影响[J].应用生态学报,2018,29(4):1313-1320,8.基金项目
本文由国家自然科学基金项目(51541906,51509037)、福建省公益类科研院所专项(2016R1032-1)、福建省科技厅重点项目(2015R0099)、福建省自然科学基金项目(2016J05096)和留学基金资助 （51541906,51509037）
This work was supported by the National Natural Science Foundation of China(51541906,51509037),the Special Project of Fujian Public Welfare Research Institute (2016R1032-1),the Key Project of Fujian Provincial Science and Technology Department (2015R0099),the Natural Science Foundation of Fujian Province (2016J05096) and the Overseas Study of Scholarship. （51541906,51509037）
