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中国国家湿地公园空间分布特征与可接近性

潘竟虎**,张建辉   

  1. (西北师范大学地理与环境科学学院, 兰州 730070)
  • 出版日期:2014-05-10 发布日期:2014-05-10

Spatial distribution characteristics and accessibility of national wetland parks in China.

PAN Jing-hu**, ZHANG Jian-hui   

  1. (College of Geographic and Environmental Science, Northwest Normal University, Lanzhou 730070, China)
  • Online:2014-05-10 Published:2014-05-10

摘要: 选取中国298个国家湿地公园样本,利用最近距离指数、K指数、核密度等计量地理学和GIS空间分析方法,对298处国家湿地公园的空间分布特征进行了分析;运用栅格成本加权距离算法,计算国家湿地公园的空间可接近性,并测算县域单元的整体可接近性;利用探索性空间数据分析方法(ESDA)分析了县域可接近性的空间差异。结果表明:中国国家湿地公园的空间分布类型属于凝聚型,省际和经济区的分布差异均较大;国家湿地公园的平均可接近时间为144.07 min,全国60%的区域国家湿地公园可接近时间在2 h以内,30 min以内的可接近性区域占全国总面积的13.29%,可接近时间最长的地点位于青藏高原,高达1283 min;可接近性的空间分布具有明显的交通指向性;县域可接近性的Moran I为正值,国家湿地公园与其邻近地区的可接近性呈显著正相关;可接近性热点分布表现出明显的热点-次热点-次冷点-冷点自东向西分布的格局;国家湿地公园的服务范围整体表现为西部>东部>中部的特征。

关键词: 根系活力, 秋华柳, 金属元素, 镉胁迫

Abstract: By using GIS and the methods of nearest neighbor index, Ripley’s K function, and kernel density estimation, the spatial distribution of 298 China’s national wetland parks was analyzed. Based on the matrix raster data, the spatial accessibility of China’s national wetland parks at countylevel was calculated by using the cost weighted distance method and ArcGIS as platforms. The spatial differences of countylevel accessibility of the national wetland parks were analyzed by the exploratory spatial data analysis (ESDA). Results show that the national wetland parks generally exhibit an aggregated distribution. There is quite difference of spatial distribution of national wetland parks among both interprovinces and intereconomic regions. The average accessibility is about 144.07 min, and the area with the accessibility of national wetland parks within 120 min reaches 60%, while the area with the accessibility within 30 min accounts for 13.29%, and the longest time needs 1283 min for one park located at central Tibetan Plateau. Moreover, the distribution of the accessibility coincides with that of traffic lines. At county level, the estimated value of Moran’s I is positive. National wetland parks and adjacent areas show a strong positive correlation. The distribution of hot spots regarding the accessibility shows an obvious hot spots-sub-hot spots-sub-cold spots-cold spots distribution pattern from east to west. Service range of each national wetland park is more advanced in western regions than that in eastern and central China.

Key words: metal elements., cadmium stress, Salix variegata, root vigor