阴山北麓地区降水特性和作物需水耦合关系分析——以武川县为例

doi:10.12190/j.issn.2096-1197.2020.05.15

Abstract

Abstract: 【Objective】To provides a basis for improving water resource utilization efficiency and supporting related agronomic measures in dry farming areas.【Methods】Based on the daily meteorological data of Wuchuan County in the northern area of Yinshan Mountain of Inner Mongolia from 2000 to 2019,the water demand characteristics of potato and spring wheat in each growth period and the coupling conditions of water demand and precipitation of crops were analyzed.【Results】The water requirements for potato and spring wheat during the whole growth period were 337.70 and 315.30 mm,respectively.The water demand of potato during tuber expansion was the largest,accounting for 32.17% of the total water demand during the whole growth period.The water requirements of spring wheat in jointing and heading stage were the largest,accounting for 25.56% and 21.28% of the water demand in the whole growth stage respectively.The water demand of potato and spring wheat during the whole growth period is greater than the effective precipitation in the same period.During the main growth period,if the coupling degree（λ）of water demand and precipitation between potato and spring wheat was λ<1,precipitation cannot meet the water demand of crops.The coupling degree of spring wheat water demand and precipitation showed a good third-degree polynomial relationship with month,with a high degree of fitting,and the determination coefficient（R²）was 0.934 3.【Conclusion】In the northern area of Yinshan Mountain,due to precipitation structure and insufficient precipitation effectiveness,the coupling degree with the water demand in the main growth period of crops is low,that is,the demand for water resources in the key growth period of crops cannot be satisfied.This research explored the balance relationship between water demand and precipitation of crops production in dry farming agricultural areas from both theoretical and practical aspects.

Key words: The northern area of Yinshan Mountain, Water demand, Precipitation, Coupling degree, Potato, Spring wheat

CLC Number:

S161.6

KANG Wenqin, DU Lei, YU Lifeng, HOU Zhihui, XU Hongtao, ZHAO Junli, HOU Anhong. Analysis of the coupling relationship between precipitation characteristics and crop water demand in the northern area of Yinshan Mountain—Taking Wuchuan County as an example[J].Journal of Northern Agriculture, 2020, 48(5): 83-89.

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Analysis of the coupling relationship between precipitation characteristics and crop water demand in the northern area of Yinshan Mountain—Taking Wuchuan County as an example

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