| Impact of climate change on soybean water demand in Heilongjiang Province from 1963 to 2022 |
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| DOI：10.7606/j.issn.1000-7601.2024.05.21 |
| Key Words: soybean crop water requirement climate change effective rainfall Heilongjiang Province |
| Author Name | Affiliation | | WU Li | Institute of Agricultural Remote Sensing and Information, Heilongjiang Academy of Agricultural Sciences, Harbin, Heilongjiang 150086, China | | BI Hongwen | Institute of Agricultural Remote Sensing and Information, Heilongjiang Academy of Agricultural Sciences, Harbin, Heilongjiang 150086, China | | ZHENG Yanyan | Institute of Agricultural Remote Sensing and Information, Heilongjiang Academy of Agricultural Sciences, Harbin, Heilongjiang 150086, China | | ZHUANG Jiayu | Agricultural Information Institute, Chinese Academy of Agricultural Sciences, Beijing 100081, China | | XIE Wenhuan | Institute of Agricultural Remote Sensing and Information, Heilongjiang Academy of Agricultural Sciences, Harbin, Heilongjiang 150086, China | | ZHANG Xiaofei | Institute of Agricultural Remote Sensing and Information, Heilongjiang Academy of Agricultural Sciences, Harbin, Heilongjiang 150086, China |
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| Abstract: |
| 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 observation 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 Heilongjiang Province was increased in 1963 to 2022. The turning point of the rapid growth of active accumulated temperature 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 season 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 precipitation increased significantly in the meteorological factors, the sunshine hours and wind speed decreased significantly, which leaded to the water requirement of soybean decreased and the coupling degree between water requirement and effective precipitation increased. It is beneficial to alleviate the drought in soybean planting area. |
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