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海滨湿地景观过程模型研究的理论基础与概念框

刘红玉1**,李兆富2   

  1. (1南京师范大学地理科学学院, 南京 210023; 2南京农业大学资源与环境科学学院, 南京 210095)
  • 出版日期:2013-10-10 发布日期:2013-10-10

Basic theory and technical framework of coastal wetland landscape process model.

LIU Hong-yu1**, LI Zhao-fu2   

  1. (1College of Geography Science, Nanjing Normal University, Nanjing 210023, China; 2College of Resources and Environmental Science, Nanjing Agricultural University, Nanjing 210095, China)
  • Online:2013-10-10 Published:2013-10-10

摘要:

景观过程模型是一种基于生态过程的、能够充分展示区域景观格局时空动态演变机制的空间显示模型。由于景观过程模型涉及一系列生态过程,能够揭示特定区域景观系统结构和功能变化过程,因此成为区域景观规划、评价和管理的重要手段。湿地景观过程模型是近年来备受关注的热点研究领域之一。本文针对海滨湿地受海洋潮汐影响、具有高度复杂和动态变化的特征,从理论基础、模型构建重点问题以及基本流程等方面进行研究,主要包括以下方面:(1)理解海滨湿地生态系统生态要素及其相互作用关系是建立基于过程驱动的景观模型基础;驱动海滨湿地生态系统过程的生态要素包括水文、土壤、植物群落类型以及气候、地貌等自然地理因素,揭示这些要素空间异质性及其对生态系统演变的影响是确定景观模型主要生态驱动变量研究的关键。(2)景观过程模型构建需要解决的关键问题包括模型结构、合适的空间尺度、模型构建方法以及模型校准与应用。景观过程模型必须能够展示空间与过程变化,通常模型包括建立于“元胞”和水平通量基础上的若干个生态系统模型;空间尺度是指“元胞”大小;“自下而上”与“自上而下”是两种构建景观模型的方法。(3)景观过程模型构建的关键技术是将生态系统模型与GIS计算机系统进行整合。本文研究框架体系主要针对海滨湿地景观过程特点而建立,对于其他湿地景观过程模型研究也具有重要指导意义。
 

Abstract: Landscape process model is a spatially explicit model which is processbased and able to fully reveal the mechanisms of the spatiotemporal dynamics of regional landscape pattern. The model concerns a series of ecological processes, can reveal the variations of the structure and function of definite region’s landscape system, and thus, is an important means for the regional landscape planning, assessment, and management. Wetland landscape process model is one of the hotspots of great concern in recent years. Coastal wetland landscape is affected by the ocean tides, and has highly complicated dynamic variations. It is needed to study these dynamic variations from the aspects of basic theory, key points of model construction, and the processes of the model construction, including (1) to understand the ecological elements (hydrology, soil, plant community, climate, and geomorphology, etc.) and their interactions of coastal wetland landscape, which is the basis for constructing processdriven landscape model, and to explore the spatial heterogeneity of these ecological elements and its effects on the ecosystem evolution, which is the key for determining the main variables of processdriven landscape model, (2) to solve the key issues for constructing landscape process model, including model structure, its appropriate spatial scale, model construction methods, and model calibration and application. The landscape process model should display space and process changes, and thus, should include several ecosystem models based on each “cell” and the horizontal fluxes of material and information between “cells”. The spatial scale of the model means the “cell” size, while the ways of the model construction are “bottom-up” and “topdown”, and (3) to integrate the ecosystem model with GIS computer system, which is the key for landscape process model construction. The technical framework described in this paper is aiming at coastal wetland landscape process, which also could have significance for the construction of landscape process models for other wetland types.