河流生态系统结构功能整体性概念模型

在完善与整合现有河流生态系统结构功能概念及模型的基础上,提出河流生态系统结构功能整体性概念模型。水文情势、水力条件和地貌景观格局是对河流生态系统结构与功能具有关键影响的3大生境要素,结构功能模型的核心是建立以3大生境要素为构架的生命支持系统与河流生命系统之间的相互作用和相互制约关系,同时考虑由于人类活动引起生境要素变化对于河流生态系统的影响。河流生态系统结构功能整体性概念模型由以下4种模型组成:河流四维连续体模型、水文情势-河流生态过程耦合模型、水力条件-生物生活史特征适宜模型以及地貌景观空间异质性-生物群落多样性关联模型,这4种模型的一体化整合,基本概括了河流生态系统结构功能的整体特征。

Holistic conceptual model for the structure and function of river ecosystems

By modifying and integrating existing concepts and models for describing the structure and function of a river ecosystem,a holistic conceptual model is developed.The hydrological regime,flow conditions and geomorpho-logical patterns are three major habitat factors that have profound impacts on the structure and function of a river ecosystem.The central piece in a holistic conceptual model is to establishing the interrelationship between the life supporting system that is mainly driven by the three factors and the river life system.The human-induced variability of habitat factors and its effect on the river ecosystem are considered during the modeling process.A holistic conceptual model usually consists of four sub-models,which are the 4-dimensional river continuum model,the coupled hydrological regime and ecological process model,the suitability model integrating of hydraulic conditions and biological and life history traits,and the spatial heterogeneity of geomorphology and biocenoses diversity model.The integration of these four models can provide essential aspects of describing the structure and function of a river ecosystem.