土地利用景观多样性的空间尺度分析——以狮城镇正方形实验区为例

Spatial Scale Analysis of the Diversities of Landuse Landscape——Taking a Square Experimental Area of Shicheng Town as a Study Case

选取狮城镇的一个正方形区域作为实验区,利用空间统计学方法,对不同尺度下景观多样性的空间格局进行分析,并进一步利用半变异函数对其空间异质性进行定量描述.结果表明:随着尺度的增加,景观多样性程度也不断增加,另外多样性的空间分布格局也具有显著变化:在小尺度下不同多样性指数估计值形成的斑块比较破碎,随着尺度增加,景观多样性格局的复杂程度趋于简单,空间变化减少,估计值相同的区域连通性逐渐增强;不同尺度的最优拟合理论模型不同;4个尺度下景观多样性均具有弱空间自相关性,且空间自相关性只保持在较小的范围内.

Taking a square experimental area of Shicheng town as a study case and using the method of Spatial Statistics, analyses spatial pattern of landscape diversity at diffferent extents. Moreover, quantitatively descripts the spatial heterogeneity by using semivariogram. The results indicate. With the increasing of scale, the degree of landscape diversity increases and the spatial pattern of landscape diversity varies dramatically. In small-scale, the patches of estimated diversity are broken. With the increasing of scale, the complexity of diversity pattern become simple, spatial variation is reduce. Regional connectivity with the same estimated value of diversity gradually strengthens. The optimum semivariogram models are different at different extents. The spatial autocorrelation of landscape diversity are weak and keep within small range at all extents.