珠江口湿地氮循环及其对环境胁迫的响应

项目名称： 珠江口湿地氮循环及其对环境胁迫的响应

项目编号： No.31270526

项目类型： 面上项目

立项/批准年度： 2013

项目学科： 生物科学

项目作者： 缪绅裕

作者单位： 广州大学

项目金额： 79万元

中文摘要： 以珠江口红树林和互花米草湿地为对象，把湿地系统作为整体，通过建立野外样地和温室模拟潮汐湿地，定量分析大气氮沉降或人工施15N迁入，采用稳定15N同位素稀释法研究底泥、孔隙水、代表动植物等组分受气候变化（干旱、咸潮）联合胁迫的氮迁移与分配（含微生物作用的底泥硝化-反硝化）,以及系统中氮的迁出（温室气体N2O排放），比较野外自然系统和温室模拟系统的氮循环过程，并研究外来种无瓣海桑和互花米草、本地种白骨壤和木榄、贝类螺类及其湿地底泥的生物地球化学进程对逆境联合胁迫的响应和适应性。以期证明干旱和咸潮等因子可能因影响底泥物理化学性质、生物的生长发育而影响湿地氮循环过程，进而导致海岸湿地退化或发育受阻的假设。研究外来植物对本地生态系统的潜在危害，有助于阐明湿地的退化过程和驱动机制，为海岸湿地的保护和可持续发展提供科学依据，对进一步了解全球气候变化与环境效应具重要意义。

中文关键词： 珠江口；湿地；氮循环；外来植物；红树林

英文摘要： For wetlands of mangrove and Spartina alterniflora in Pearl River Estuary, by establishing the field plots and simulated wetland experiments in greenhouse, this propsal takes the wetland system in its entirety, to quantitative analysis the subsidence of nitrogen in air or input amount of 15N to the ecosystem, by using the stable isotope 15N to study the changes of nitrogen transportation and partition in subsystems of sediment, pore water, presentative plants and animal, including the sediment nitrification and denitrification with microbe activity, which affactted by climate changes (especilly drought and salty tide), and output of nitrogen from the ecosystem (greenhouse gas N2O), to campare the process of nitrogen cycle in nature field plots and artificial simulated system in greenhouse, to reveal the responses and adaptations for alien species of Sonneratia apetala, Spartina alterniflora, and native species of Avicennia marina, and Bruguiera cylindrica, snails and shells, also the process of biogeochemistry of wetland sediment to the stress environmental factors of drought and salty tide. The aims of this proposal are to cetify that the hypothesis of the ecological factors of drought and salty tide maybe affact the nitrogen cycle by impacting the physi-chemical characteristics of sediment and the development

英文关键词： Pearl River Estuary；wetland；Nitrogen cycle；alien species；mangrove