EFFECTS OF SPATIAL GRAIN SIZE ON LANDSCAPE PATTERN OF LAND - COVER TYPES AT COUNTY - LEVEL | 县域土地覆盖景观特征的粒度效应研究

chinois. 土地覆盖是生态系统的重要组成部分，其具有明显的空间尺度（包括空间粒度和幅度）属性。近年来，尺度问题成为景观空间研究的关键环节之一，因此，研究土地覆盖景观特征的粒度效应具有重要的理论意义与实际意义。本文以湖北省成丰县第二次土地调查数据为基础，分别从类型水平及景观水平上对其土地覆盖景观特征的粒度效应进行研究。研究结果表明：粒度增加对优势景观有加强作用，随着空间粒度逐渐增大，景观中的优势覆盖类型面积比率增大，其他景观覆盖类型面积逐渐减少。各景观指数对粒度变化敏感程度各不相同，较敏感的是有效网格大小、斑块密度、凝聚度指数。不同景观特征与粒度变化的相关性也存在较大差异。在类型水平上，不同景观指数对粒度响应程度不同，而相同指数在不同粒度范围受粒度变化影响也不同；景观水平上，各土地覆盖类型景观随粒度变化表现出不同的空间异质性，景观指数随粒度变化呈现出不同的变化规律。

anglais. Land cover is an important component of the ecosystem, which has obvious spatial scale （ including spatial size and ampli- tude） properties. In recent years, landscape - scale study becomes one of the key links. Therefore, the study about the size of land- scape features is both significant in theoretic and practice. This paper, from the type and landscape level, makes a study on the particle effect. The results show that： increasing the size will strengthen the advantage of the landscape. With the space size increases, the area ratio of advanced landscape cover types increases, while the area of other types reduced gradually. Landscape index shows a different degree of sensitivity. And the sensitive ones, which place in the second, are patch density, the effective mesh size and the combination index. At pattern scale, different landscape index responses differently to the grain size, while the same landscape index, in different size ranges, is influenced by the changes of grain size. At landscape scale, land - cover types have different spatial landscape heteroge- neity due to the different particle size. Along with the changes of grain size, landscape index shows variation.