摘要
河西走廊绿洲区的粮食生产在干旱区的粮食生产、供求和粮食安全中一直处于重要的位置,本文基于人粮关系,运用土地资源承载力(LCC)模型,从分市和分县两个空间尺度上对河西走廊绿洲1985—2009年的土地资源承载力的时空格局进行了分析。结果表明:1985—2009年河西走廊绿洲的土地资源承载力指数(LCCI)介于0.690～0.894之间,其中,只有2000年和2001年处在0.875～1,其他年份的土地资源承载力指数总体上处在富裕和盈余状态;从分市格局来看,1985—2009年河西走廊绿洲的土地资源承载力与总体水平的变化趋势相一致,粮食盈余和人粮平衡的市多于严重超载的市;从分县尺度上来看,河西走廊绿洲土地资源承载力以粮食盈余为主,55%的县域处于不同程度的盈余状态,这些县域主要分布在河西走廊中部和东部;人粮关系处于平衡的县域占全区的5%;40%的县域处于不同程度的粮食亏缺状态,需要大量区外调配。
The production of grain in the oasis of Hexi corridor plays an important role in the grain supply and food security for the arid areas.From the viewpoint of man-grain relationship,the land carrying capacity （LCC） models were used to analyze the spatial-temporal dynamic patterns of land carrying capacity in the oasis of Hexi corridor from 1985 to 2009 at city and county level.The results showed that the overall land carrying capacity index（LCCI） in the oasis of Hexi corridor was 0.690～0.894 from 1985 to 2009.Except for the year of 2000 and 2001 when the land carrying capacity index was 0.875～1,it was at rich and surplus level in other years.At the city level,the change tendency of the land carrying capacity index was identical to that of the overall level from 1985 to 2009.The number of cities at grain surplus and balance level was more than that at severe overload level.At the county level,the land carrying capacity index in the oasis of Hexi corridor was basically at grain surplus level,and 55% of the counties,which were mainly distributed in the central and the eastern part of Hexi corridor,reached such a level;5% of the counties were at balance level of man-grain relationship;while 40% of the counties were at grain deficit level,and they needed large amount of grain import.
出处
《干旱地区农业研究》
CSCD
北大核心
2013年第2期203-208,共6页
Agricultural Research in the Arid Areas
基金
国家自然科学基金项目(40961035)
甘肃省自然基金项目(0803RJZA094)
关键词
人口
粮食
土地资源承载力
河西走廊
population
grain
land carrying capacity
Hexi corridor
