Impact of climate change on soybean water demand in Heilongjiang Province from 1963 to 2022
To assess the impact of climate change on soybean water requirements in Heilongjiang Province,we analyzed daily meteorological data from 1963 to 2022 from 61 weather stations,along with soybean growth observa-tion data from 1993 to 2013 from 20 agricultural meteorological stations.The distribution maps of active accumulated temperature(≥10℃),effective precipitation,crop water requirement,coupling degree of crop water requirement and effective precipitation and their climatic tendencies were calculated and drawn by using five-day moving average method,the single crop coefficient method,MATLAB calculation and Mann-Kendall trend test method during soybean growth period.The results showed that:(1)The active accumulated temperature of Hei-longjiang Province was increased in 1963 to 2022.The turning point of the rapid growth of active accumulated tem-perature was in 1993-2002.The period of gentle growth of active accumulated temperature was in 1973-1992.The rapid growth period of accumulated temperature was in 1993-2022.The planting boundary line of different maturity soybeans moved northward and eastward obviously.(2)The effective precipitation during the soybean growing sea-son was 377 mm,initially increasing and then decreasing from west to east.The crop water requirement was 312 mm,with a decreasing climatic trend of-3.14 mm per decade,and a spatial decrease from west to east.(3)The coupling degree showed an increasing trend between crop water requirement and effective precipitation during the growth period of soybean in 1963 to 2022.Tailai County experienced significant growth,while parts of the northern region showed a decreasing trend,leading to increased water resource consumption.(4)The temperature and pre-cipitation increased significantly in the meteorological factors,the sunshine hours and wind speed decreased signifi-cantly,which leaded to the water requirement of soybean decreased and the coupling degree between water require-ment and effective precipitation increased.It is beneficial to alleviate the drought in soybean planting area.
soybeancrop water requirementclimate changeeffective rainfallHeilongjiang Province
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