摘要
从人为干扰明显、生态性脆弱、幅度范围在1 000km2的角度出发,该文选取了长三角地区无锡市为研究对象。通过采用多因子加权叠加模型方法获取了研究区的生态斑块,借助景观指数等探讨了生态斑块粒度效应及其临界变化情况。结果表明:1)以生态斑块为研究斑块类型时,类型水平景观指数、景观水平指数和面积变化指数均具有明显粒度效应,并存在临界粒度和尺度域现象。2)三类指数的临界粒度一致为粒度2,即实际为60m;尺度域分别为(2,30)、(2,10)和(2,10),综合尺度域为(2,10),即实际为60～300m,是符合研究区特性的尺度域。在该尺度域范围内,指数粒度变化响应曲线变化平稳,蕴含的生态过程较为相似,进行尺度推绎具有可行性。
Effect of grain size of ecological patch is of great importance for the precise analysis of regional pattern and the trans- mission of information for ecological process. Academic researches on effect of grain size have applied to different types of patch, such as land cover, land use and urban heat island type, patches of ecological type rarely is applied. So the purpose of this paper was to explore changes of critical grain size of ecological patch. The study case of Wuxi in the Yangtze River Delta Region was selected because its characteristics were similar to those of previous study cases, i. e. , a rapid urbanizing region with vulner- able environment, human disturbance from frequent social-economic activities and the area extent of 1 000 kmz. A combination of mixed methods was used including the model of multi-weight factors, landscape metrics at class and landscape level, and metrics of area change. The results demonstrated that： 1） landscape metrics at class and landscape level, and metrics of area change exis- ted obvious effect of grain size. The critical grain size showed by the responding curves of landscape metrics of class and land- scape level and metrics of area change were the same, i. e. , 60 meter~ the scale domain of landscape metrics of class and land- scape level and metrics of area change were （2,30）, （2,10） and （2,10） respectively. Generally grain size from 60 m to 300 m was the scale domain to local ecological patterr~ In this scale domain, the responding curves of indicators changed smoothly, which indicated that the ecological processes are similar and it is suitable for scaling.
出处
《地理与地理信息科学》
CSCD
北大核心
2014年第5期88-92,共5页
Geography and Geo-Information Science
基金
中国博士后基金项目(20090451220)
中国博士后基金特别资助项目(2010003592)
关键词
粒度效应
生态斑块
人为干扰
长三角地区
无锡
effect of gain size
ecological patch
human disturbance
the Yangtze River Delta Region
Wuxi
