主办单位:中国气象局沈阳大气环境研究所
国际刊号:ISSN 1673-503X
国内刊号:CN 21-1531/P

Journal of Meteorology and Environment ›› 2022, Vol. 38 ›› Issue (5): 81-87.doi: 10.3969/j.issn.1673-503X.2022.05.010

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The evolution characteristics of coupling degree between maize water need and effective precipitation in Heilongjiang province

Hui-hui QU1(),Dong-dong WANG2,Min-hui YAN3,Mo ZHAI1,Dan LIU1,Ping YAN1,Xiao-ming WANG4,Li-xia JIANG1,*()   

  1. 1. Heilongjiang Provincical Institute of Meteorological Science/Innovation and Opening laboratory of Regional Eco-Meteorology in Northeast, China Meteorological Administration/Meteorological Academician Workstation of Heilongjiang Province, Harbin 150030, China
    2. Executive Service Center, Heilongjiang Provincial Meteorological Service, Harbin 150030, China
    3. Heilongjiang Provincial Meteorological Service Center, Harbin 150030, China
    4. Meteorological Data Center of Heilongjiang Province, Harbin 150030, China
  • Received:2021-03-05 Online:2022-10-28 Published:2022-11-04
  • Contact: Li-xia JIANG E-mail:quhuihui808@163.com;hljjlx@163.com

Abstract:

Based on the daily meteorological data from 69 meteorological stations from 1971 to 2018, the method recommended by FAO was used to calculate the water need by maize.In addition, the effective precipitation was calculated using the U.S.Department of Agriculture Soil Conservation method.Mann-Kendall test and GIS inverse distance weighted interpolation were used to analyze the coupling degree between maize water need and effective precipitation and its evolution characteristics in Heilongjiang province.The results showed that the effective precipitation increased in most areas during the growth period before maize jointing in Heilongjiang province, but it decreased in most areas during the growth period after maize jointing, and the changing trend was slightly different in different regions.Affected by meteorological factors such as the decrease in wind speed and daylight hours, the maize water need in most areas of Heilongjiang province decreased, and the speed of deceleration was the fastest in the east and the slowest in the north.The coupling degree of maize water requirement and effective precipitation was higher in the middle and northeast of Heilongjiang province, and it was lower in the west; the coupling degree was lower before jointing, and it was higher after jointing.The coupling degree of each region showed a trend of decrease-increase-decrease-increase in Heilongjiang province.From 2011 to 2012, it was the obvious mutation point of the coupling degree from low to high.

Key words: Water need of maize, Effective precipitation, Coupling degree

CLC Number: