摘要
为了深入分析京津冀地区耕地破碎化和人工干扰程度,以空间网格为基本单元,采用核密度函数法对耕地进行密度计算,继而采用自然断点法进行密度分区,采用景观格局指数法,对耕地的空间分布特征、破碎化程度进行定量分析,最后采用耕地破碎度指数和人工干扰指数对比分析提出耕地整治的方向。结果表明：耕地核密度变化范围为0~95.08点/km2,85%以上的耕地集中分布在区域中部和东南部的中密度区到高密度区,耕地面积随着密度降低而减少;耕地斑块密度指数、斑块边界密度指数、面积加权分维数和耕地斑块聚集度在不同密度区的变化情况均反映出破碎化程度随着耕地密度减小而增大;耕地破碎度指数和人工干扰度指数均随着耕地密度降低而升高,人工干扰是该区域耕地破碎化程度加剧的主要因素。采用核密度估计法能合理地反映耕地聚集程度和破碎化程度,可为京津冀地区协同发展、耕地整治和土地利用优化布局提供理论支撑。
Beijing-Tianjin-Hebei Region is one of the most important developing regions in China,which relates to the national development strategy. The paper＇s purpose is to analyze the fragmentation degree and artificial interference of the cultivated land. The space grid was taken as the basic unit and the density of cultivated land was calculated by kernel density function. And the density zoning was realized by natural breaks method. Then,the spatial distribution characteristics and the fragmentation degree of the cultivated land quantitatively were analyzed by using landscape pattern indexes. Finally,the direction of the consolidation of cultivated land was indicated by making a comparative analysis of the cultivated land fragmentation index and the artificial disturbance index. The results show that,the variation range of the density of cultivated land is 0 ~ 95. 08 points / km2,and more than 85% of the cultivated lands are distributed in the medium to high density region,centrally located in the central and southeastern of the region. The cultivated land area was decreased with the reduction of density value. The patch density,patch edge density,area weighted fractal dimension and the variation of the degree of aggregation in different density zones of the cultivated land all showed that,the fragmentation of the cultivated land was increased with the reduction of density value,but it was decreased with the reduction of density value in different density zones of artificial landscape. Both the degree of fragmentation and the degree of artificial disturbance were increased gradually with the increasing density value of cultivated land. And the humandisturbance is the main factor to the increasing fragmentation in the region. Using kernel density function method can reflect the aggregation degree and the change characteristics of fragmentation of cultivated land more reasonably,and it can provide a reference for land consolidation and land use optimization in Beijing-Tianjin-Hebei Region.
出处
《农业机械学报》
EI
CAS
CSCD
北大核心
2016年第5期281-287,共7页
Transactions of the Chinese Society for Agricultural Machinery
基金
国土资源部公益性行业科研专项(201511010-06)
关键词
京津冀地区
耕地
空间格局
核密度估计
破碎化
Beijing-Tianjin-Hebei Region
cultivated land
spatial pattern
kernel density estimation
fragmentation
