微尺度下的荒漠绿洲景观结构数量分析与绿洲稳定性研究——以甘肃景泰县为例

Quantitative Analysis of Micro Scale Landscape Structure and Study of the Stability of Desert Oasis——Case study of Jingtai County in Gansu Province

采用景泰县典型荒漠绿洲2006—2008年土地利用变更数据作为研究的基础材料,运用景观生态学中多样性指数、均匀度指数和优势度指数等有关结构数量分析的方法,对研究区土地利用结构分异进行定量分析,结合该区种植结构调整对土地生产力、经济的影响的实地调查,对绿洲稳定性进行分析。结果表明,2006—2008年研究区景观异质性下降,景观组分趋向不均匀分布,优势斑块对景观的控制作用在增强,斑块趋向异质化,绿洲稳定性增强。

In this study, based on the land-use change data of representative desert oasis in Jintai county of Gansu province from 2006 to 2008 and by using methods of quantitative analysis on indices of landscape ecology, i.e., the diversity index, the evenness index and the dominance index, analysis on the differentiation of land use structure in the study area and analysis on the oasis stability in combination with field survey of planting structure adjustment on land productivity and economy were conducted. The result showed that the landscape heterogeneity decreased, the landscape components tended to be heterogeneous distribution, the dominant patch＇s control role on landscape strengthened, and the stability of oasis enhanced from 2006 to 2008.