Changing ground water levels: the impact on an invasive species and native plant communities in a Mediterranean dune ecosystem

地下水位变化：对地中海沙丘生态系统中入侵物种和本土植物群落的影响

• 批准号: 21479940
• 负责人: Professorin Dr. Christiane Werner
• 金额: --
• 依托单位: Professur für Ökosystemphysiologie
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2006
• 资助国家: 德国
• 起止时间: 2005-12-31 至 2010-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/21479940?language=en
• 关键词: Changing; ground; water; levels; impact

The introduction of non-native species and its spread are recognized to be one of the major threats to biodiversity and ecosystem functioning. Climate change is expected to enhance ecosystem invasibility through changes in resource availability (e.g. water) and the risks of desertification in Mediterranean areas, however scientific studies are rare. This project will evaluate specific traits of a characteristic invader towards competition for limited resources and the consequent alteration of community functioning under decreasing ground water availability. We selected a protected Mediterranean costal dune system of high ecological value, where large-scale extraction of ground water provides excellent experimental conditions to study changes in the competitive balances among invasive and native species. We will analyse the effects i) at the seedling level to evaluate changes in plant establishment; ii) at the plant level to gain major insights on the spatial and temporal partitioning of water sources and regulating mechanisms of selected species and iii) at the community level to evaluate changes in water flow, competition and facilitation (e.g. hydraulic lift), community functioning, and changes in invasibility of the system. The aim is the identification of key processes controlling the competitive balances between invasive neophytes and native species and invasibility of semi-arid systems to contribute to a risk assessment under global change scenarios.

非本地物种的引进及其传播被认为是对生物多样性和生态系统功能的主要威胁之一。预计气候变化将通过资源供应（如水）的变化和地中海地区荒漠化的风险增加生态系统的可入侵性，但科学研究很少。该项目将评估一种特征性入侵者的具体特征，以争夺有限的资源，并在地下水可用性下降的情况下改变社区功能。我们选择了一个受保护的地中海沿岸沙丘系统的高生态价值，大规模提取地下水提供了良好的实验条件，研究入侵物种和本地物种之间的竞争平衡的变化。我们将分析影响i）在幼苗水平，以评估植物建立的变化; ii）在植物水平，以获得对水资源的空间和时间划分的主要见解和选定物种的调节机制和iii）在社区水平，以评估水流，竞争和促进（例如水力提升），社区功能的变化，以及系统的入侵性的变化。其目的是确定控制入侵新植物和本地物种之间的竞争平衡和半干旱系统的可入侵性的关键过程，以促进全球变化情景下的风险评估。

项目成果

Simulating the growth and distribution of planktic foraminifer using an ecophysiological multi-species model

使用生态生理多物种模型模拟浮游有孔虫的生长和分布

• DOI: 10.5194/bgd-8-1-2011
• 发表时间: 2011
• 期刊: Biogeosciences Discussions
• 作者: Werner C. ;Gessler A.
• 通讯作者: Gessler A.

Responses of woody species to spatial and temporal ground water changes in coastal sand dune systems

• DOI: 10.5194/bg-8-3823-2011
• 发表时间: 2011-12
• 期刊: Biogeosciences
• 影响因子: 4.9
• 作者: C. Máguas;K. Rascher;A. Martins-Loução;P. Carvalho;P. Pinho;M. Ramos;O. Correia;C. Werner

Impact of an exotic N2-fixing Acacia on composition and N status of a native Mediterranean community.

• DOI: 10.1016/j.actao.2010.11.005
• 发表时间: 2011
• 期刊: Acta Oecologica-international Journal of Ecology
• 影响因子: 1.8
• 作者: Christine Hellmann;R. Sutter;Kathie Grieve Rascher;C. Máguas;O. Correia;C. Werner

High competitiveness of a resource demanding invasive acacia under low resource supply

• DOI: 10.1007/s11258-009-9625-0
• 发表时间: 2009
• 期刊: Plant Ecology
• 影响因子: 1.7
• 作者: C. Werner;Ulrich Zumkier;W. Beyschlag;C. Máguas