| Characteristics of combination of cold damage and drought during seedling period and its effects on maize yield in Heilongjang Province |
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| DOI：10.7606/j.issn.1000-7601.2020.01.33 |
| Key Words: accumulated temperature anomaly ≥10℃ water deficiency index cold damage drought maize yield |
| Author Name | Affiliation | | JINAG Lixia | Heilongjiang Province Institute of Meteorological Science, Innovation and Opening Laboratory of Regional Eco-Meteorology in Northeast, China Meteorological Administration, Meteorological Academician Workstation of Heilongjiang Province, Harbin, Heilongjiang 150030, China | | LI Xiufen | Heilongjiang Province Institute of Meteorological Science, Innovation and Opening Laboratory of Regional Eco-Meteorology in Northeast, China Meteorological Administration, Meteorological Academician Workstation of Heilongjiang Province, Harbin, Heilongjiang 150030, China | | ZHU Haixia | Heilongjiang Province Institute of Meteorological Science, Innovation and Opening Laboratory of Regional Eco-Meteorology in Northeast, China Meteorological Administration, Meteorological Academician Workstation of Heilongjiang Province, Harbin, Heilongjiang 150030, China | | GAO Ming | Heilongjiang Province Meteorological Bureau, Harbin, Heilongjiang 150030,China | | WANG Qiujing | Heilongjiang Province Institute of Meteorological Science, Innovation and Opening Laboratory of Regional Eco-Meteorology in Northeast, China Meteorological Administration, Meteorological Academician Workstation of Heilongjiang Province, Harbin, Heilongjiang 150030, China | | YAN Ping | Heilongjiang Province Institute of Meteorological Science, Innovation and Opening Laboratory of Regional Eco-Meteorology in Northeast, China Meteorological Administration, Meteorological Academician Workstation of Heilongjiang Province, Harbin, Heilongjiang 150030, China | | GONG Lijuan | Heilongjiang Province Institute of Meteorological Science, Innovation and Opening Laboratory of Regional Eco-Meteorology in Northeast, China Meteorological Administration, Meteorological Academician Workstation of Heilongjiang Province, Harbin, Heilongjiang 150030, China | | ZHAI Mo | Heilongjiang Province Institute of Meteorological Science, Innovation and Opening Laboratory of Regional Eco-Meteorology in Northeast, China Meteorological Administration, Meteorological Academician Workstation of Heilongjiang Province, Harbin, Heilongjiang 150030, China | | JI Yanghui | Heilongjiang Province Institute of Meteorological Science, Innovation and Opening Laboratory of Regional Eco-Meteorology in Northeast, China Meteorological Administration, Meteorological Academician Workstation of Heilongjiang Province, Harbin, Heilongjiang 150030, China | | WANG Ping | Heilongjiang Province Institute of Meteorological Science, Innovation and Opening Laboratory of Regional Eco-Meteorology in Northeast, China Meteorological Administration, Meteorological Academician Workstation of Heilongjiang Province, Harbin, Heilongjiang 150030, China |
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| Abstract: |
| Based on the observation data from agro\|meteorological stations from 1981 to 2016 in Heilongjiang Province and by using of accumulated temperature anomaly ≥ 10℃ and water deficiency index (KCWDI) indicators from the People’s Republic of China meteorological industry standards for assessment of cold damage and drought to maize during seedling\|seventh leaf period separately, this paper stipulated that combination emergence of two kinds of disasters, which cold damage and drought year occurred in the same year in the same station, and the temporal and spatial distributions of them were analyzed. The relationship between accumulated temperature anomaly ≥10℃, KCWDI, and maize yield was constructed by mathematical and statistical method, and the effects of two kinds of disasters on maize yield were investigated by relative yield method. The results showed that accumulated temperature anomaly ≥10℃ increased（P<0.01）from 1981 to 2016, and the latitude change was that accumulated temperature anomaly ≥10℃ was low in the north and high in the south, and KCWDI fluctuated, and its longitude change was that KCWDI was high in the west and low in the east during maize seedling\|seventh leaf period in the study area, and this two kinds of disaster occurrence was consistent with climate warming trend and resource distribution in the research area. The sum of cold damage and drought years was from 0 to 10 in each station and the total number was 59 years in the whole study area during the research period. The frequency of cold damage and drought year decreased, and its appearance was frequent before mid-1990. After that, the frequency declined. The frequency of cold damage and drought year in the west was higher than that in the east, and there were frequent cold damage and drought years in Songnen Plain. Correlation between accumulated temperature anomaly ≥10℃, KCWDI, and maize yield was significant (P<0.05或P<0.01) in maize seedling\|seventh leaf period, and accumulated temperature anomaly ≥10℃ had a positive impact on maize yield, and KCWDI had a negative effect on maize yield, so the former increased and the latter decreased, which was favorable to maize yield. On the contrary, decrease in temperature and increase in water deficit were disadvantageous to maize yield increase. The effects of cold damage and drought stress on maize yield were mainly negative at maize seedling\|seventh leaf stage. |
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