绵阳市涪城区耕地景观格局时空演变特征分析

The Temporal Evolution of Landscape Pattern for Cultivated Land in Hilly Area of Northwest Sichuan

土地利用/覆被变化研究已成为全球环境变化研究的重要领域,耕地时空演变是国内外学者关注的焦点。以四川省绵阳市涪城区为例,利用1996年、2000年、2005年和2009年土地利用数据及相关基础地理数据,运用景观格局原理与GIS空间分析方法,研究川西北丘陵区耕地景观时空格局及其演变机理(驱动力)。结果表明:(1)13年来,研究区耕地面积呈急剧减少趋势,动态度明显高于省内丘陵区平均水平;(2)耕地景观空间格局稳定性逐步降低,格局时空变化的地形分异十分显著;(3)耕地景观格局时空演变是坡度、新增建设用地、人口密度、高程、城镇化水平、GDP、起伏度等负向驱动力和灌溉条件、等级公路水平、土地整理程度等正向驱动力因子共同作用的结果。

The study on the land use and cover change （LUCC） has become one of the important fields in the re- search of the global environmental change, in which the temporal evolution of cultivated land has drawn special at- tention of the scholars home and abroad. Based on the landscape theory, remote sensing （RS） and geographic in- formation system （GIS）, this paper, taking Mianyang City as an example, analyzes the city＇s northwest hilly farmland structure and its spatial evolution and temporal patterns, and probes into the temporal evolution of land mechanism （driving force） by using the land use database （ 1996, 21300, 2005 and 21309） and other related geo- graphic data. The result indicates that： （1） During the past 13 years, there is a sharp decline in amble land in the studied area, and its dynamic equilibrium is much higher than the average level of the provine.e of Sichuan; （2） The stability of the farmland pattern in the studied area has been reducing gradually, and the temporal and spatial variation of the terrain varies significantly; （3） The temporal and spatial evolution of farmland landscape has been jointly affected by such negative driving forces as the slope land, the new construction sites, the popula- tion density, the elevation, the urbanization, GDP, etc., and those positive driving forces like the irrigation con- ditions, the level of high-grade highways, and the land intensity, etc.