甘肃省土地利用结构变化及其驱动力分析

以甘肃省1997～2004年的土地详查数据为基础,采用变化贡献率、年均变化强度指数、变化速度以及洛伦茨曲线对甘肃省1997～2004年8年的土地利用结构时空变化进行了研究,并分析了影响甘肃省土地利用结构变化的驱动力.结果表明:1)在时间尺度上,林地变化最大.就各市(州)而言,耕地和牧草地除了金昌市略有增加外,其余市(州)都呈递减趋势,园地、林地和交通用地都有所增加.2)在空间尺度上的变异不明显,基本上没有发生大的变化,水域、牧草地和居民点及工矿用地在甘肃省分布较为分散,耕地、园地和林地的分布不均衡.3)综合甘肃省土地利用结构变化的驱动因子,影响甘肃省土地利用结构变化的因素有3个:社会经济、农业发展和人口因素.

Dynamic change and driving forces analysis of land use structure in Gansu Province

Based on land change data of Gansu Province from 1997 to 2004,the spatial and temporal changes of the land use structure and its driving forces were studied with the contribution rate,the average intensity index,the speed of land use structure change and Lorenz curves.The results showed as following:1)With temporal change,woodland areas was the most prominent.With regard to the difference of temporal change among the cities(cantons),cultivated land and grassland areas took on a downward trend,except for Jinchang city,which showed a slightly upward trend,while garden plot,woodland and traffic land areas increased in all the cities.2)Spatial change was not prominent,the distributions of water,grassland and residential and industrial land were disperse,the distributions of cultivated land,garden land and woodland did not balance.3)The driving factors of changes in land use structure of Gansu Province were socio-economic and agriculture development and population.