典型内陆淡水湿地区退耕还湿适宜性定量评价研究

在人为及自然因素双重胁迫下，三江平原的湿地面积急剧减少、功能不断退化，因此湿地保护及恢复工作显得尤为重要。退耕还湿是保护和恢复三江平原受损湿地生态系统的有效措施，其首要和基础任务是对区域农田进行退耕还湿适宜性评价，以确定适宜还湿农田的具体位置及空间分布特征。研究基于自然与社会经济因素考虑，构建了三江平原湿地区退耕还湿适宜性评价体系，并以三江国家级自然保护区为例，运用地理空间叠加分析方法，成功提取了该区域农田退耕还湿适宜性的空间分布特征，验证了典型内陆淡水湿地区退耕还湿适宜性定量评价的可行性，进而丰富了退耕还湿的理论体系与方法，为退耕还湿工作提供了一种新的技术手段。图8，表3，参33。

Quantitative Evaluation of Suitability for Converting Croplands to Wetlands in Typical Inland Limnetic Wetland Region

Sanjiang plain marsh decrease dramatically and functions degenerate constantly under human and natural influence.The protection and restoration of wetland beccomes more and more imperative.Converting croplands to wetlands is an effective way of protecting and restoring wetlands.The principle and basic task of which is firstly to perform suitability evaluation of cropland retirement,and then to identify the position and spatial distribu-tion characteristics of croplands that are suitable for retirenebt.By considering natural and social economic factors,this research established a suitabili-ty evaluation system for converting croplands to wetlands in Sanjiang plain.Taking Sanjiang National Nature Reserve as an example,the spatial distri-bution characteristics of croplands suitable for retirement were identified using GIS spatial overlay analysis,which verified the feasibility of quantitative suitability evaluation of converting crophnds to wetlands in typical inland wetland region. By offering such a new technique for the analysis on convert-ing corplands to wetlands,the study aimed to enrich theories and methods of wetland protection and restoration.