土地整理项目区景观格局粒度效应初探

Preliminary Study on Granularity Effects of Landscape Pattern in Land Reconsolidation Areas

研究目的:分析土地整理项目区景观格局粒度效应,探讨粒度变化对土地整理前后景观格局变化的影响。研究方法:景观格局分析法。研究结果:(1)对小尺度范围上的平原型土地整理区,除平均斑块形状指数、平均斑块分维数对粒度变化的响应呈现弱敏感性外,其他指数均具有明显的粒度效应;(2)相关性强的景观指数变化趋势相近;(3)整理前后景观指数的粒度效应可分为变化规律一致且无明显变化拐点、变化规律不一致且整理前后具有不同变化拐点、无规律变化三种类型。研究结论:为准确分析土地整理前后景观格局变化情况,首先应选择合适粒度,对于小尺度范围上的平原型整理项目区,选择10—25m粒度较为适宜;在景观分析指数选择上,应选择敏感性强、相关性低的景观指数。

The purposes of this paper are to analyze granularity effects of landscape pattern in land reconsolidation areas, and to explore the impacts of granularity variation on landscape patterns before and after land reconsolidation. Method employed is landscape pattern analysis. The results indicate that （ 1 ） granularity effects appear in most of the indices in the land reconsolidation projects of plain area with small scale, excepting the indices of average plaque and average plaque fractal dimension, which are weakly related with the variation of granularity; （2） the variation trends of highly related landscape indices are similar; （3） the granularity effects before and after land reconsolidation can be divided into three types, such as those with the same variation trend but without any obvious inflexions, those with different variation trend and with inflexions, and those without any obvious variation trend. The paper concludes that （1） in order to accurately analyze the variation situations of landscape patterns before and after land reconsolidation, the proper granularity should be selected first, e.g., in the land reconsolidation projects of plain area with small scale, granularities from 10m to 25m are relatively proper;（2） regarding the indices for landscape analysis, those with high sensitivity and low correlation should be chosen.