摘要
以土地利用图为基础,利用GIS和统计分析相结合,选取景观优势度、景观形状指数、景观破碎度和平均景观斑块分维等指标,对黄土丘陵区安塞县景观空间分布和结构特征进行了分析研究。结果显示:人类活动对各种景观类型的优势度的影响十分显著,集中体现在坡耕地和荒坡地上,二者面积之和达到总面积的73.12 % ;随着人类活动影响的增强,景观破碎度指数呈显著增加趋势;斑块形状受地貌形态因素的影响更为显著,集中体现在有林地和荒坡地上,其形状指数值大于其它景观类型;随着斑块面积的增加,平均斑块分维数总体趋势呈缓慢上升。这些结果表明,安塞县目前的景观格局极不合理,不利于安塞县生物多样性的维持。
Based on land use map, the indexes of landscape dominance, landscape shape, landscape fragmentation and mean patch fractal dimension were selected and calculated using GIS and statistical methods for Ansai County. Then the structure and spatial distribution of landscape types were analyzed using these indexes. The results show that the landscape structure has been obviously affected by human activities. The landscape is dominated by the slope farmland and wild slope land, whose area account for the 73.12% of the total area. With increase of human activities,landscape fragmentation index increased greatly. Yet the patch shape is mainly affected by landforms, being reflected by forest land and slope farmland with shape index bigger much than other landscape types;With the increase of the average patch area,mean patch fractal dimension index increases slowly as a whole。These findings show that the present landscape structure is unreasonable in Ansai in terms of biodiversity conservation, environmental stability and sustainable use of resources.
出处
《水土保持学报》
CSCD
北大核心
2005年第2期167-170,共4页
Journal of Soil and Water Conservation
基金
国家自然基金项目 (40 30 1 0 2 9)
中科院"西部之光"人才培养计划项目 (B2 2 0 1 2 90 0 )
中科院水保所领域前沿项目 (SW0 4 1 0 1 )
西北农林科技大学重点基金项目 (C1 4 8)
