【摘要】：農(nóng)地邊際化是農(nóng)地利用發(fā)生改變的直接前提、重要原因,而現(xiàn)有農(nóng)地邊際化理論體系并不完善,尤其是在空間尺度上探討不足。為了摸清蘭州市永登縣社會(huì)發(fā)展中農(nóng)地邊際化的作用規(guī)律,進(jìn)而給農(nóng)地資源合理利用與保護(hù)提供依據(jù),利用RS、GIS技術(shù),通過(guò)空間建模、空間疊加分析以及Dagum基尼系數(shù)分析方法,采用定性與定量相結(jié)合的方法對(duì)蘭州市永登縣1990-2014年時(shí)間段內(nèi)的農(nóng)地邊際化作用規(guī)律進(jìn)行深入的時(shí)空分析,得出以下結(jié)論:(1)24年間,永登縣于1991年前后出現(xiàn)了第一次邊際化跡象,在1999-2003年、2013-2014年兩個(gè)時(shí)段內(nèi)出現(xiàn)了明顯的邊際化現(xiàn)象。其中,在自然因素的驅(qū)動(dòng)下,1999-2003年發(fā)生邊際化現(xiàn)象持續(xù)時(shí)間最長(zhǎng)、邊際化作用規(guī)律最為顯著的農(nóng)地“低端邊際化”現(xiàn)象;而在社會(huì)發(fā)展因素驅(qū)動(dòng)下,2013-2014年的邊際化更為突出,特別是建設(shè)用地的增加導(dǎo)致的農(nóng)地“高端邊際化”現(xiàn)象突出。(2)農(nóng)地邊際化率較高的鄉(xiāng)鎮(zhèn)是:城關(guān)鎮(zhèn)9.98%、秦川鎮(zhèn)6.7%,說(shuō)明這兩個(gè)鎮(zhèn)在發(fā)生“農(nóng)地邊際化現(xiàn)象”時(shí)程度更深;農(nóng)地邊際化比重較高的鄉(xiāng)鎮(zhèn)有:七山鄉(xiāng)9.23%、民樂(lè)鄉(xiāng)7.72%、上川鎮(zhèn)7.47%、秦川鎮(zhèn)7.21%,說(shuō)明這些鄉(xiāng)鎮(zhèn)發(fā)生“農(nóng)地邊際化現(xiàn)象”的范圍更廣。(3)永登縣邊際化農(nóng)地空間分布特征:(1)西部和北部石質(zhì)山地,邊際化農(nóng)地呈“階梯化”分布;(2)中南部黃土丘陵溝壑區(qū),農(nóng)地呈“樹(shù)枝狀”分布,邊際化農(nóng)地分布在“樹(shù)枝”的“末梢”;(3)大通河與莊浪河谷地,邊際化農(nóng)地呈現(xiàn)“零星”分布;(4)東部秦王川盆地,邊際化農(nóng)地在建成區(qū)附近的居多,呈現(xiàn)向建成區(qū)“包圍式”分布。(4)永登縣農(nóng)地邊際化空間作用規(guī)律是:在兩大河流水系區(qū)域,距河道越遠(yuǎn),農(nóng)地邊際化程度越高,農(nóng)地范圍整體上向河谷地區(qū)收縮聚攏;海拔越高,邊際化越嚴(yán)重;城鎮(zhèn)化程度越高,其邊際化程度也越高。(5)在研究時(shí)間段內(nèi),永登縣總體Dagum基尼系數(shù)為0.648,農(nóng)地邊際化程度在空間上呈現(xiàn)出高度的非均衡性;超變密度貢獻(xiàn)率為75.45%,是農(nóng)地邊際化地區(qū)差距的主要來(lái)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.
【學(xué)位授予單位】：甘肅農(nóng)業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類(lèi)號(hào)】：F321.1

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