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《Arid Land Geography》 2011-01
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Effect of planting structure adjustment on water cycle

ZHANG Jin-ping1,PEI Yuan-sheng2,GUO Bing-tuo3,ZHAO Yong2(1 Zhengzhou University,Zhengzhou 450001,Henan,China;2 China Institute of Water Resources & Hydropower Research,Beijing 100044,China;3 Yellow River Engineering Consulting Co.,Ltd.,Zhengzhou 450003,Henan,China)  
At present,the planting structure adjustment is one of the important water saving works in irrigation area of a large-middle scale.The great regional planting structure adjustment must be bring the water consumption to a great change which will have a profound influence on water cycle process and the whole region water use.For this reason,the mechanism change of water cycle induced by planting structure adjustment is analyzed on the start,and then according to the different water consumption of different land use types,the application is presented of water cycle model to simulate water cycle process and water consume with the measure of planting structure adjustment in Ningxia plain.The results show as follows:(1) the planting structure adjustment changes regional water cycle process: the strength of water cycle is weakened;the groundwater table is declined,the water-drawing and drainage consumption is also decreased.In the plain area of Ningxia municipality,the Yellow River is the main water source for agriculture irrigation,the Yellow River water consumption is occupied by above 75% in the whole water use.The planting structure adjustment will cause the reduce of the Yellow River water consumption for nature ecosystem;(2) the different planting structure adjustment has a different effect on water consumption: when the paddy planting area decreases,the soil evaporation and the crop transpiration separately reduce by 0.19×108 m3 and 0.82×108 m3,while the intercrop area decreases,the decrements of evaporation and transpiration are 1.18×108 m3 and 0.16×108 m3;(3) the planting structure adjustment has an important effect on water consumption of ecosystem: when the paddy area decreased by 0.6 million mu,low efficient water consumption and high efficient water consumption separately reduce 0.2×108 m3 and 0.03×108 m3,while the intercrop area decreased by 0.6 million mu,low efficient water consumption and high efficient water consumption separately reduce 0.21×108 m3 and 0.05×108 m3;(4) low efficient water consumption and high efficient water consumption of the whole region are all reduced,but low efficient water consumption also plays the important role.From the mentioned above,regardless of the regional water cycle process and the water consumption change,the planting structure adjustment also has a great effect on them.Meanwhile,compared with other engineering measures,the planting structure adjustment has the characteristics of time-saving and labour-saving,which make it become an important development aspect to improve the water use efficiency.
【Fund】: 科技部西部开发重大项目“宁夏经济生态系统水资源合理配置研究”(2004BA901A17)
【CateGory Index】: S271
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