IMHE OpenIR  > 成都山地所知识仓储(2009年以前)
长江三峡库区土地环境容量亟待改善
Alternative TitleENVIRONMENTAL CAPACITY DEMADING URGENT IMPROVEMENT IN THE THREE GORGES RESERVOIR REGION OF THE CHANGJIANG RIVER
周万村
Corresponding Author周万村
1988
Source Publication山地研究
ISSN1008-2786
Volume6Issue:2Pages:81-86
Abstract

长江三峡库区,系指东起湖北宜昌,西至四川江津城西约10公里的长江段,南北到长江分水岭。境内包括川鄂两省宜昌、重庆等24个县市,土地面积62552平方公里,人口约2014万,人平土地面积0.31公顷余。 地貌分区以四川奉节为界,此界以东是川鄂接壤中山低山峡谷区,以西为川东平行岭谷低山丘陵区。全区地形以深丘、低山和中山为主。山地面积占库区土地面积的85%,平坝只约占15%。
长江三峡库区的土地环境容量在削弱。这既表现在土地利用不合理,又表现为地表覆盖质量差,如森林面积小,植被在变稀,土层在减薄,耕地在缩减,有些地方出现"石化",土地资源失去利用价值,不能保证土地资源的永续利用。造成如此失调的原因,有自然因素方面的,如山高坡陡,土层保肥保水能力差和土壤侵蚀较强等,也有人为因素方面的,如人口增长、乱砍滥伐森林、陡坡垦殖、过渡放牧、乱占耕地局政策上的失误等。这直接关系到当地工农业的发展,即直接关系到当地社会经济的发展。因此说,长江三峡库区土地环境容量亟待改善。


 

Other Abstract The area around the Three Gorges’ Reservoir Region of the Chang jiang River is 62552km2 and it has population of 20. 14 million. It limits a range between the sortfr-north watersheds and from Yichang of Hubei to Jiangjin ofSichuan, including 24 cities or counties——Chongqing, Yichang and Wanxianetc.In this region, relief are mainly Hills and middle-low mountains. The area of mountains makes up 85% of total area and the plain makes up about 15%. It has a moist monsoon subtropical climate.The environmental capacity of land means that under the condition of keeping the eco-environment good and land-use perpetual, the land resource has a capacity of development for industry, agriculture, forestry and animal husbandy etc. Its expressive form is landcover-landuse.The environmental capacity of the local land is weakening. The eco-envir-onment and the productive conditions have deterioratedf ,ore xample. low quality of landcover, the decrease of forest area (the rate of forestcover was 15% in 1985) and cultivated land, a large amount of nonirrigated land on the steep slope under cultivation, thinned soil layer, serious soil erosion and large area of other sadland. The reasons are. natural factors (high mountain and steep slope, strong soil erosion, frequent mountain disasters etc.) and man-made factors (sharp increase of population, denudation of forest, caltivation on the steep slope, excessive graze and possession of cultivated land in disorder) , Adaptable measures to improve the environmental capacity of -land in this region are. 1. to enlarge area of forest (rate of forestcover must, be up to 30%) ;2, to return the cultivated land on the 玹eep slope to forest land or to grass land and stictly to forbid to bring wasteland under cultivation; 3, stictly to forbid to possess the cultivated land on plain in disorder; 4. to transform the cultivated land of low output; 5. to build grasslands. 
Keyword长江三峡库区 环境容量 土地面积 湖北宜昌 峡谷区 分水岭 四川 川东 生态环境 森林覆盖率
Language中文
Document Type期刊论文
Identifierhttp://ir.imde.ac.cn/handle/131551/10668
Collection成都山地所知识仓储(2009年以前)
Affiliation中国科学院成都地理研究所
First Author Affilication中国科学院水利部成都山地灾害与环境研究所
Recommended Citation
GB/T 7714
周万村. 长江三峡库区土地环境容量亟待改善[J]. 山地研究,1988,6(2):81-86.
APA 周万村.(1988).长江三峡库区土地环境容量亟待改善.山地研究,6(2),81-86.
MLA 周万村."长江三峡库区土地环境容量亟待改善".山地研究 6.2(1988):81-86.
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