梁野山国家级自然保护区景观生态风险评价

Landscape Ecological Risk Assessment of Liangyeshan National Nature Reserve

以梁野山国家级自然保护区为研究区,分析不同空间粒度下景观指数变化趋势,确定适宜的空间粒度;利用景观生态风险指数模型,计算样方尺度、生态单元尺度和行政村尺度下的景观生态风险指数,采用地统计方法进行景观生态风险区的空间表达;对比分析3种空间尺度下景观生态风险分布情况,样方尺度与生态单元尺度下景观生态风险评价结果与研究区情况比较符合,为中生态风险。由于样方尺度下,景观生态风险评价结果精度受样方单元边界大小影响较大,而生态单元尺度是以自然的地形地貌特征为基础划分评价单元,可有效表征研究区景观生态风险的空间分异,所以选择生态单元尺度进行研究区景观生态风险评价更加适合。

Taking Liangyeshan National Nature Reserve as the research area,the change trend of landscape index under different spatial granularity was analyzed to determine the appropriate spatial granularity;using the landscape ecological risk index model,the landscape ecological risk index under the sample scale,ecological unit scale and administrative village scale were calculated,and the spatial expression of landscape ecological risk area was carried out by geostatistics;three kinds of empty spaces were compared and analyzed.The results of landscape ecological risk assessment on the scale of quadrat and ecological unit are consistent with those of the study area,which belongs to the middle ecological risk.The accuracy of landscape ecological risk assessment results is greatly affected by the size of sample unit boundary under the sample scale,and the ecological unit scale is to divide assessment units based on the natural topography and geomorphology characteristics,which can effectively represent the spatial differentiation of landscape ecological risk in the study area,so it is more suitable to select the ecological unit scale for landscape ecological risk assessment in the study area.