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Homogenisation of ECosystem functioning between Temperate and Neotropical streams due to AgRicultural land usE (HECTARE)

由于农业用地的使用（公顷），温带和新热带河流之间生态系统功能的同质化

基本信息

批准号：
215988486
负责人：
Dr. Mario Brauns
金额：
--
依托单位：
Department Fließgewässerökologie
依托单位国家：
德国
项目类别：
Research Grants
财政年份：
2012
资助国家：
德国
起止时间：
2011-12-31 至 2016-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/215988486?language=en
关键词：
Homogenisation ECosystem functioning between Temperate

项目摘要

The expansion and intensification of agricultural areas and the associated deforestation, eutrophica-tion and modification of habitat heterogeneity remain the most important stressors to stream ecosys-tem functioning worldwide. The alteration of key environmental characteristics may cause the loss of functional attributes specific for streams in different climate zones and may ultimately lead to a ho-mogenisation of stream ecosystem functioning. Previous studies were mostly restricted to a single function in a particular biome and a thorough understanding on the potential for an agriculturally driven functional homogenisation of stream ecosystems among climate zones is lacking. The project HECTARE analyses ecosystem functioning of pristine and agricultural streams situated in the German Harz and in the Brazilian Cerrado and Atlantic forest. By the novel combination of quantification of food webs and measurements of ecosystem productivity and respiration, HECTARE delivers a mech-anistic understanding on energy- and matter fluxes in temperate and Neotropical streams including their trophic coupling to the catchments. Building on that, key pathways of whole-ecosystem matter and energy fluxes that are impacted by agricultural land use will be identified. The inter-biome ap-proach proposed with HECTARE will allow for a synthesis of impact patterns associated with agricul-tural land use and an analysis of the degree of functional homogenisation of stream ecosystems.

农业用地的扩大和集约化以及与之相关的森林砍伐、富营养化和生境异质性的改变仍然是全球河流生态系统功能最重要的压力源。关键环境特征的改变可能导致不同气候带溪流特有的功能属性丧失，并可能最终导致溪流生态系统功能的同质化。以前的研究大多局限于一个特定的生物群系的单一功能，缺乏对气候带之间的河流生态系统的农业驱动的功能同质化的潜力的深入了解。HECTARE项目分析了位于德国哈茨和巴西塞拉多和大西洋森林的原始河流和农业河流的生态系统功能。HECTARE将食物网定量化与生态系统生产力和呼吸测量相结合，提供了对温带和新热带河流中能量和物质通量的机理理解，包括其与集水区的营养耦合。在此基础上，将确定受农业土地使用影响的整个生态系统物质和能量通量的主要途径。与HECTARE一起提出的生物群落间方法将允许综合与农业土地利用相关的影响模式，并分析河流生态系统功能均匀化的程度。