中文摘要：

耕地撂荒在国际和国内众多区域都有分布,而且近年来有愈演愈烈的趋势。撂荒地块的提取是进一步研究耕地撂荒状况的基础。该文详细阐述了重庆市典型县的撂荒耕地地块的提取过程,利用2期耕地图层叠加,剔除退耕还林和森林工程图斑,得到撂荒耕地分布图,在此基础上得出了重庆市典型县的耕地撂荒状况。将随机抽样提取的撂荒耕地图斑与Google Earth影像验证,撂荒耕地图斑提取的正确率达到85.3%,该方法用于提取山区的撂荒耕地是可行的。研究发现,2011年石柱、巫山和酉阳3县的耕地撂荒率分别为14.0%、19.9%和19.2%,整体上3县的平均撂荒率为18.0%,撂荒耕地总面积为5.6万hm2。撂荒耕地以旱地为主,占总撂荒地面积的82.4%,旱地撂荒率为20.4%,水田撂荒率为11.5%。3县中,巫山县和酉阳县的撂荒率高于石柱县;而且,在水田撂荒方面,巫山县和酉阳县的水田撂荒率也明显高于石柱县,3县的水田撂荒率分别为17.2%、13.9%与6.3%。

英文摘要：

Farmland abandonment refers to the phenomenon of cultivated land remaining unused and idle for more than one year.Two-thirds of China＇s land area is hilly area and plateau area,and slope farmland area is larger.The quality of cultivated land in some provinces is not high as a whole,and there are a lot of phenomena of farmland abandonment.The farmland abandonment is distributed in many international and domestic regions,and in recent years there is a growing trend.But domestic research on farmland abandonment is more often conducted at the macro theoretical level,such as research on phenomenon,mechanisms,and countermeasures of farmland abandonment,however very few organizations or individuals have specified the scale of farmland abandonment or specific related data.Extraction of abandoned parcels is the foundation for further study on the status of farmland abandonment.This article describes the extraction process of abandoned farmland parcels in Chongqing＇s typical counties in detail,and selects the years of 2002–2011 as the study period; and for the regional level,through the general investigation of abandoned parcel,the article investigates the scale and distribution of abandonment.Farmland figure spots are extracted from the topographical map in 2002 and the current land use map in 2011.Then,the superposition of farmland layers in 2 periods provides a distribution map of abandoned farmlands in 2002-2011.The above step obtains information on abandoned farmlands,including abandoned farmlands that are returned to forest areas during the period of 2002-2011.The research object of this paper is abandoned farmland that was voluntarily abandoned by farmers,especially as this particular type of farmland must be removed.After eliminating the figure spots of returning farmland to forest（2002–2006） and forest projects（2008–2011）,we get the distribution map of abandoned arable land.Through verifying abandoned farmland figure spots extracted from maps and Google Earth images,the correct rate of figure spo