1986~2014年灵川县景观格局动态变化分析

Dynamic changes of Landscape pattern in Lingchuan county During 1986-2014

摘要:

以广西灵川县 1986年、2000年、2014年 Landsat 遥感影像为主要信息源,综合运用 3S技术,分析景观格局动态 变化特征。 结果表明:28年来,灵川县林地、建设用地、裸地持续增加,其中建设用地增幅高达 159. 11%,农田不断减少,水 体和草地先减少后增加,景观变化主要受农林种植活动及城镇化影响 ; 1986~2014年间受林果种植规模化、城镇化面状扩 张等影响,整体景观的破碎化程度减弱,斑块趋向于规则化,各景观类型的均匀性、异质性降低;从景观类型来看,林地和建 设用地破碎度降低,连接度增加,农田破碎度增加,趋向分散经营,水体以集中分布为主,但连接度降低,草地破碎度降低、 斑块复杂性增强,裸地趋向于集中分布。 受退耕还林、封山育林、石漠化治理、林果种植以及城乡开发建设等因素驱动,各 景观类型主要向林地、建设用地转移。

Abstract:

Based on3s technology, landsat remote images of Lingchuan county in 1986,2000and 2014were used to study dynamic changes of landscape pattern during 1986~2014. The results showed that woodland, construction land and bare land continuously increased, and construction land increased by 159. 11%, meanwhile, farmland rapidly decreased, and wa- ter body and grassland decreased first and then increased, and landscape change was mainly affected by agricultural and forestry planting activities and urbanization in the past 28years . Due to the scale of forest and fruit planting and the hori- zontal expansion of urbanization, fragmentation degree of the whole landscape and patch complexity decreased, and even- ness and heterogeneity of various landscape types weakened during 1986~2014. on the landscape type scale, the fragmen- tation degree of woodland and construction land decreased, while connectivity degree increased. Farmland tended to be separated management, and the fragmentation degree increased. water body was concentrated distribution and connectivi- ty decreased. Fragmentation degree of grassland decreased, and patch complexity was enhanced. The distribution of bare land tended to be concentrated. All kinds of landscape types mainly translated into the woodland and construction land be- cause of the conversion of farmland into forestland, closing the land for reforestation, treatment of stony desertification, the planting of woods and fruit, urban land expansion and so on .