城市扩张背景下景观破碎度与耕地连接度演变分析

The Evolution of Landscape Fragmentation and Cultivated Land Connectivity Under the Background of Urban Expansion

城市快速扩张改变了区域内的景观类型和组成,对区域内的景观格局及生态过程造成了影响。以南昌市为例,分析了2000—2015年城市扩张导致的破碎化与形态变化对于耕地景观连接度的影响。运用城市破碎化指数(UFI)量化景观破碎水平,基于形态学空间格局分析(MSPA),得到耕地的七类景观要素,然后通过概率连接度指数(PC)和斑块重要值(dPC)评估景观连接度变化,并在4km×4km的格网上计算平均UFI和斑块重要值。研究可为南昌市城市发展及耕地保护提供参考。

The rapid urban expansion has changed the landscape types and composition in the region,and affected the landscape pattern and ecological process.Taking Nanchang as an example,this paper analyzes the impact of fragmentation and morphological changes caused by urban expansion on cultivated land landscape connectivity from the year 2000 to 2015.The urban fragmentation index(UFI)is used to quantify the landscape fragmentation level.Based on the morphological spatial pattern analysis(MSPA),seven types of landscape elements of cultivated land are obtained.Then the change of landscape connectivity is evaluated by probability connectivity index(PC)and patch importance value(DPC).At a 4km×4km grid the average UFI and patch importance are calculated.The research can provide reference for the urban development and cultivated land protection of Nanchang city.