近20年来四川省农田生态系统时空变化

The Spatial-Temporal Changes of Farmland Ecosystem in Sichuan Province During the Recent 20 Years

在ArcGIS技术支持下,通过构建并运用综合指标法、重心曲线等,将四川省1990、1995、2000、2005、2010年5期农田生态系统数据集进行处理分析,揭示了四川省近20年来农田生态系统的时空变化特征.结果表明:四川省农田生态系统发生了较大的变化,农田生态系统的面积不断减少,减少速度虽有波动但总体上趋缓;四川省农田生态系统变化地域类型发生了显著的变化,增长活跃区与增减平衡型活跃区区县的数量不断减少,减少型活跃区与变化迟缓区区县的数量不断增加,地域类型变化在空间分布上朝着简单化、单一化方向发展;四川省农田生态系统各时期重心均有偏移,但重心偏移的距离与方向都比较小.

The spatial-temporal change in Sichuan Province Dataset of the farmland ecosystem in 1990,1995,2000,2005 and 2010 were collected and processed by utilizing comprehensixe indicator method and gravity centers curve in ArcGIS environmet.The results showed：the spatial-temporal characteristics of farm ecosystem changed a lot,the extent of farmland ecosystem kept decreasing in general,with slight fluctuation,the change of regional types were obvious,the increased-active areas and the balanced-active areas decreased,while the decreased-active areas and the changed-slowed areas increased.The distribution of regional types tended to be simple and single,the centroid position of the ecosystem in each period changed with quite slight displacement distance and angle.