摘要
互花米草(Spartina alterniflora)入侵中国滨海湿地,对湿地沉积物氮循环产生重要影响。选取闽江河口互花米草和短叶茳芏(Cyperus malaccensis)沉积物为研究对象,测定沉积物潜在硝化速率(PNR)及其沉积物理化学性质,探讨河口湿地沉积物的硝化过程对互花米草入侵的响应。结果表明:短叶茳芏和互花米草沉积物PNR变化范围分别为0.19~2.18μg N·g^(-1)·d^(-1)和0~0.52μg N·g^(-1)·d^(-1),变异系数均为63%。短叶茳芏15~25 cm的PNR比表层0~15 cm低(P<0.05),但PNR随月份的动态变化没有显著差异(P>0.05)。互花米草沉积物PNR随沉积物深度变化无显著差异(P>0.05)。互花米草沉积物的PNR显著低于短叶茳芏的(P<0.01),PNR减少27.03%~100%,8月及20~25 cm沉积物减少最多。除含水率和沉积物深度与PNR显著相关外(P<0.05),温度、氧化还原电位、pH和电导均与PNR不相关(P>0.05)。
Spartina alterniflora invaded coastal wetlands in China, which had significant impact on sediment nitrogen cycle in wetland ecosystem. The potential nitrification rate （PNR） and physical and chemical properties of sediment were analyzed to study the response of sediment PNR on S. alterniflora invaded Cyperus malaccensis marsh of the Min River estuary. Results indicated that the PNR of C. ma- laccensis and S. alterniflora varied from 0. 19 to 2. 18 μgN g-1 . d -l, and from 0 to 0. 52 μgN g-1 d-1, respectively, and their variable coefficient both were 63%. PNR of C. malaccensis in 15 -25 cm were significantly lower than 0 - 15 cm （ P 〈 0. 05 ）, but there was no significant difference among month （ P 〉 0.05 ）. Although no significant difference among month was found in S. alterniflora （ P 〉 0.05 ）, the PNR of S. alterniflora were significantly lower compared with C. malaccensis （P 〈 0. 01 ）. PNR, reduced about 27.03% to 100% in S. alterniflora sediments than in C. malaccensis, and the largest reduction were observed in August and 15 - 25 cm, respectively. In addition, A significant cor- relation was found between moisture content, sediment depth and PNR （P 〈 0.05 ）, while there were no significant correlation among sediment temperature, redox potential, pH, conductivity and PNR （P 〉 0. 05）.
出处
《亚热带资源与环境学报》
2017年第3期19-26,60,共9页
Journal of Subtropical Resources and Environment
基金
福建省公益类科研院所专项(2017R1034-6)
福建师范大学校级创新团队项目(IRTL1205)
国家自然科学基金资助项目(31000262)
关键词
潜在硝化速率
互花米草入侵
沉积物
闽江河口
potential nitrification rate, Spartina alteraiflora invasion, sediments, the Min River Estuary
