白城市农作物虚拟水量时空分异特征研究

通过对1998～2008年白城市各县市区农作物的虚拟水量的计算,分析了白城市农作物虚拟水的时空分异特征。白城市农作物虚拟水量的变化趋势基本与粮食作物虚拟水量的变化趋势一致,总体呈现不断波动变化的状态;2004年和2007年农作物的虚拟水量相对其他年份较高,而经济作物、蔬菜以及瓜果的虚拟水量较低且变化不大。对比分析1998年、2004年和2008年5县市区虚拟水量的空间分布特征,1998年白城市虚拟水量达到了3个等级,通榆县等级最高;2004年,通榆县和洮南市虚拟水量增长最大,虚拟水量均上升了两个等级,洮北区、大安市和镇赉县虚拟水量均上升了一个等级;2008年与2004年相比,各县市区的虚拟水量均有所下降了。

STUDY ON SPATIAL- TEMPORAL DISTRIBUTION CHARACTERISTICS OF CROP VIRTUAL WATER IN BAICHENG CITY

Virtual water is the important research field of food security and water security. In order to provide scientific basis for agricultural sustainable development in Baicheng City, the crop virtual water of Baicheng City from 1998 to 2008 is calculated to study its spatial - temporal distribution rules. The crop virtual water in Baicheng City presented a series of changes, which was consistent to the change trend of grain crops. The virtual water of grain crops appeared high peaks in 2004 and 2007, and that of the economic crops, vegetable, melons and fruits changed little. Compared with the spatial distribution of crop virtual water content in 1998, 2004 and 2007 in five counties, there were larger change. In 1998 the crop virtual water was divided into three levels, Tongyu is the highest. In 2004, the crop virtual water of Tongyu and Taonan county all increased two level; Taobei and Daan county all increased one level. Compared with 2004, the virtual water in Baicheng City all decreased in 2008.