摘要
甘肃半干旱区天然降水是主要的水资源 ,而干旱区的水资源来自于南部祁连山以及阿尔金山的山区降水和冰雪融水 .甘肃半干旱区在小麦生长需水关键期的 5 6月 ,降水量离差系数大 ,农业生产易遭旱灾 .河西干旱区出山径流较稳定 ,为灌溉农业的稳定提供了基础 .甘肃半干旱地区的水资源持续开发利用应主要拦蓄大气降水 ,配合开发地下水 ,并合理规划利用地表水 ,其中雨水集流工程和旱作节水农业技术的推广政策和措施是关键 .干旱区的水资源持续开发利用主要应通过水价调整来引导建立节水型经济结构和推广节水技术 。
Water resources are critical to the development of regional economy and to the protection of ecosystem and environment, especially in the arid and semi arid regions. Along with the increase of population, the development of industry and agriculture, and the deterioration of water quality in the arid and semi arid regions of Gansu Province, the sustainable utilization and exploitation of water resources are crucial. This paper is intended to make a comparative study of the composition of water resources, the problems in the exploitation and utilization of water resources, and the management and the policy supporting system of water resources in the arid and semi-arid regions of Gansu Province. The semi arid regions are mainly distributed in the middle and east of Gansu Province, while the arid regions are located in the Hexi Corridor in front of mountains. In the semi arid regions, precipitation is the source of water resources; therefore rainwater collecting engineering of irrigation is the main way of the water resources utilization. In the arid regions, the runoff from mountainous watersheds is the source of water resources. Precipitation and melt water from glaciers and snow cover form runoff in mountains. Therefore, the oasis agriculture in front of mountains is irrigated by the runoff from mountains, and the water saving irrigation is the main way to rise the efficiency of water resources utilization. Annual runoff variation is larger in the semi arid regions, while that is rather smaller in the arid regions. Both the arid regions and the semi arid regions are lack of water resources, but it is much more serious in the semi arid regions. The arid and semi arid regions are facing the problems of increasingly serious contamination of water and rising of mineralization of the ground water. In the semi arid regions, the emphasis of the water resources management should be put on artificial interception of atmosphere precipitation, rational exploitation of ground water and planning of surface water utilization. For interception of precipitation, great progress has been achieved in the last 30 years. Nevertheless, there is still a lack of scientific allocation and management of water resources. From a long term of view, water laws and policy should be gradually perfected, and the sewage treatment and irrigation system should be set up. In the arid regions, the water saving economy should be achieved by the spreading of water saving technology. In Hexi Corridor, a large proportion of water resources are consumed by agriculture, hence the agriculture water saving technology is critical. The management of drainage basins is also very important. It is necessary not only to coordinate the rational allocation of water resources for the oases at the upper and lower courses of the inland river basins, but also to coordinate the water resources utilization of the ground water and surface water, the clean water and sewage water. The protection of the mountainous water resources and the water utilization in oasis agriculture and ecosystem protection in the down course area should be balanced in the inland river basins, in order to achieve the sustainable exploitation and utilization of water resources.
出处
《冰川冻土》
CSCD
北大核心
2001年第1期74-79,共6页
Journal of Glaciology and Geocryology
基金
"九五"国家重点科技攻关项目!(96 912 0 3 s)
国家自然科学基金重点项目!(497310 30 )资助
关键词
干旱区
半干旱区
水资源
持续开发利用
降水
水价调整
节水技术
arid and semi arid regions
water resources
sustainable exploitation and utilization
comparative analysis
