兰州市永登县农地边际化研究

发布时间：2018-11-05 14:16

【摘要】：农地边际化是农地利用发生改变的直接前提、重要原因,而现有农地边际化理论体系并不完善,尤其是在空间尺度上探讨不足。为了摸清兰州市永登县社会发展中农地边际化的作用规律,进而给农地资源合理利用与保护提供依据,利用RS、GIS技术,通过空间建模、空间叠加分析以及Dagum基尼系数分析方法,采用定性与定量相结合的方法对兰州市永登县1990-2014年时间段内的农地边际化作用规律进行深入的时空分析,得出以下结论:(1)24年间,永登县于1991年前后出现了第一次边际化迹象,在1999-2003年、2013-2014年两个时段内出现了明显的边际化现象。其中,在自然因素的驱动下,1999-2003年发生边际化现象持续时间最长、边际化作用规律最为显著的农地“低端边际化”现象;而在社会发展因素驱动下,2013-2014年的边际化更为突出,特别是建设用地的增加导致的农地“高端边际化”现象突出。(2)农地边际化率较高的乡镇是:城关镇9.98%、秦川镇6.7%,说明这两个镇在发生“农地边际化现象”时程度更深;农地边际化比重较高的乡镇有:七山乡9.23%、民乐乡7.72%、上川镇7.47%、秦川镇7.21%,说明这些乡镇发生“农地边际化现象”的范围更广。(3)永登县边际化农地空间分布特征:(1)西部和北部石质山地,边际化农地呈“阶梯化”分布;(2)中南部黄土丘陵沟壑区,农地呈“树枝状”分布,边际化农地分布在“树枝”的“末梢”;(3)大通河与庄浪河谷地,边际化农地呈现“零星”分布;(4)东部秦王川盆地,边际化农地在建成区附近的居多,呈现向建成区“包围式”分布。(4)永登县农地边际化空间作用规律是:在两大河流水系区域,距河道越远,农地边际化程度越高,农地范围整体上向河谷地区收缩聚拢;海拔越高,边际化越严重;城镇化程度越高,其边际化程度也越高。(5)在研究时间段内,永登县总体Dagum基尼系数为0.648,农地边际化程度在空间上呈现出高度的非均衡性;超变密度贡献率为75.45%,是农地边际化地区差距的主要来源。
[Abstract]:Farmland marginalization is the direct premise and important reason for the change of farmland utilization. However, the existing theoretical system of farmland marginalization is not perfect, especially on the spatial scale. In order to understand the law of land marginalization in the social development of Yongdeng County, Lanzhou City, and to provide the basis for the rational utilization and protection of farmland resources, the spatial modeling is carried out by using RS,GIS technology. Spatial superposition analysis and Dagum Gini coefficient analysis are used to analyze the regularity of farmland marginalization in Yongdeng County of Lanzhou City from 1990 to 2014 by using the method of qualitative and quantitative analysis. The conclusions are as follows: (1) in the last 24 years, Yongdeng County showed the first sign of marginalization in 1991, and obvious marginalization in 1999-2003 and 2013-2014. Among them, driven by natural factors, the phenomenon of "low-end marginalization" of farmland occurred in 1999-2003, which lasted for the longest time and had the most obvious law of marginalization. Driven by social development factors, the marginalization in 2013-2014 is more prominent, especially the phenomenon of "high-end marginalization" of agricultural land caused by the increase in construction land. (2) the villages and towns with high rural land marginalization rate are: Chengguan Town 9.98%. Qinchuan town 6.7 points out that the two towns in the occurrence of "agricultural land marginalization phenomenon" when the depth of the deeper; The villages and towns with high proportion of marginal farmland are: 9.23 in Qishan Township, 7.72 in Minle Township, 7.47 in Shangchuan Town, 7.21 in Qinchuan Town. It shows that the phenomenon of "rural land marginalization" occurs in these villages and towns in a wider range. (3) the spatial distribution characteristics of marginalized farmland in Yongdeng County: (1) in the western and northern rocky mountains, the marginal farmland is "stepped"; (2) in the loess hilly and gully region of central and southern China, the farmland is distributed in the form of "branches", and the marginal farmland is distributed in the "end" of the "branches", (3) the marginal farmland in the Datong River and Zhuanglang Valley is distributed in a "sporadic" manner. (4) in the eastern Qinwangchuan Basin, the marginal farmland is mostly located in the vicinity of the built area, showing a "surrounding" distribution. (4) the spatial effect of farmland marginalization in Yongdeng County is as follows: the farther away from the river course, in the two major river system areas, The higher the degree of marginalization of farmland is, the smaller the farmland area is to the valley area as a whole; The higher the altitude, the more serious the marginalization; The higher the degree of urbanization, the higher the degree of marginalization. (5) in the period of study, the overall Dagum Gini coefficient of Yongdeng County is 0.648, and the degree of farmland marginalization shows a high degree of disequilibrium in space; The contribution rate of supervariable density is 75.45%, which is the main source of the disparity in the marginal area of farmland.
【学位授予单位】：甘肃农业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：F321.1

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