| Variation of effective precipitation and water deficit index in maize growing season in Jilin Province during 1960—2015 |
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| DOI：10.7606/j.issn.1000-7601.2018.01.35 |
| Key Words: maize growing stages precipitation water requirement water deficit index evaporation |
| Author Name | Affiliation | | QIU Mei-juan | Institute of Meteorological Sciences of Jilin Province, Changchun 130062, China | | GUO Chun-ming | Institute of Meteorological Sciences of Jilin Province, Changchun 130062, China | | WANG Dong-ni | Institute of Meteorological Sciences of Jilin Province, Changchun 130062, China | | YUAN Fu-xiang | Institute of Meteorological Sciences of Jilin Province, Changchun 130062, China | | QU Si-miao | Institute of Meteorological Sciences of Jilin Province, Changchun 130062, China | | REN Jing-quan | Institute of Meteorological Sciences of Jilin Province, Changchun 130062, China | | LI Zhong-hui | Institute of Meteorological Sciences of Jilin Province, Changchun 130062, China | | MU Jia | Institute of Meteorological Sciences of Jilin Province, Changchun 130062, China |
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| Abstract: |
| Based on the meteorological data from 50 weather stations during 1960 to 2015 and observation data of maize growth period during 1981 to 2014 in Jilin Province, the water requirement and effective precipitation in maize growing season and different growth stages during 1960 to 2015 in Jilin Province were estimated by Penman-Monteith equation. Further, the water deficit index in each growth stages of maize were calculated and analyzed in the study area. The results showed that average effective precipitation in maize growing season were between 242～374 mm, and the variation rate was -12.0～4.9 mm·10a-1, showing a downward trend. The effective precipitation in vegetative phase had an upward trend in the most middle and west region as well as some of the east region, while other growth stages showed a downward trend. The average water requirement in maize growing season was between 452 mm and 637 mm, and the climate tendency rate was -16.5～10.3 mm·10a-1 with a descending tend. Water requirement in reproductive phase mostly had an increasing trend, while other growth stages were mainly a decreasing trend. The average water deficit index in maize growing season was 23%～58%, and the climate tendency rate was -0.8～1.9·10a-1 with the most tend to ascend. Water deficit index in vegetative phase were mainly a decreasing trend, and it had an increasing trend in other growth stages. The middle and west region were the low area of effective precipitation, but they were the high area of water requirement, so that the water deficit were serious. The east region was the high area of effective precipitation, but it was the low area of water requirement, so that the water deficit was relatively slight. |
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