湿地外来克隆植物大米草种群扩张和自然衰退的水文驱动机制

项目名称： 湿地外来克隆植物大米草种群扩张和自然衰退的水文驱动机制

项目编号： No.31200313

项目类型： 青年科学基金项目

立项/批准年度： 2013

项目学科： 生态学

项目作者： 李红丽

作者单位： 北京林业大学

项目金额： 24万元

中文摘要： 外来植物入侵是重要的生态学问题，对于外来克隆植物大米草在大西洋沿岸进行扩张的同时，在中国海岸带却出现自然衰退，原因不明。水文是决定滨海湿地植物生长繁殖及扩张的重要环境因子之一，但目前对水文条件如何影响大米草种群在不同区域进行扩张和自然衰退的机制缺乏深入研究。本项目以入侵地美国海岸带种群，衰退地中国海岸带种群和原产地英国海岸带种群为研究对象，以实验生态学、比较生态学理论为基础，综合运用温室控制实验、分子标记及同位素示踪等方法，研究不同地理位置大米草种群生长繁殖性状的差异，以及在不同水文变异条件下适应性和竞争力的差异，检验科学假说"湿地外来克隆植物大米草扩张种群适应水文条件变异的能力及此条件下的竞争力优于衰退地种群和原产地种群"，进而研究外来克隆植物大米草在不同区域进行入侵和自然衰退的水文驱动机制。该研究成果将为丰富植物种群生态学提供素材，也将对深入理解植物入侵及其入侵控制提供理论依据。

中文关键词： 克隆植物；大米草种群；扩张衰退；水文驱动机制；

英文摘要： Biological invasion of exotic plants is important ecological issue. For extotic clonal plant, Spartina anglica is invading most the Atlantic coast in the word, however it is undergoing dieback in coast China. Because the hydrological condition is one of important enviromental factors which influce plant growth, reproduction and spread in salt masrh, however it is not very clear hydrological mechanism for Spartina anglica invasion and dieback in different sites. We will compare the growth and reproduction traits difference among three diffenent geography Spartina anglica popupulation from American, Chinese and English coast under the same and heterogeneity water condition. Three sites respectively delegate invasion, dieback and native Spartina anglica population. Following, we will analyse the plasticity and competition difference among three population under different hydrological condition change. In order to study the hydrological driving mechanism of S.anglica population invasion and dieback, we mainly do some experiments with the methods of greenhouse controlling experiments, molecular marker and isotope tracer basing on experiment and analysis ecology theory. We will test these scientific hypothesises that " the invasion S. anglica population from American coast have strong adapatability and competition tha

英文关键词： Clonal plant；Spartina anglica plant；invasion and dieback；the hydrological driving mechanism；