| Establishment and application of comprehensive drought assessment index for winter wheat |
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| DOI：10.7606/j.issn.1000-7601.2023.06.27 |
| Key Words: winter wheat drought assessment index Loess Plateau |
| Author Name | Affiliation | | ZHOU Jia | Institute of Arid Meteorology,China Meteorological Administration,Key Laboratory of Arid Climatic Change and Reducing Disaster of Gansu Province, Key Laboratory of Arid Climatic Change and Reducing Disaster of CMA, Lanzhou, Gansu 730020, China
The School of Management Xi’an Jiaotong University, Xi’an， Shaanxi 710049, China | | YANG Xiaoli | Pingliang Meteorological Bureau, Pingliang, Gansu 744000, China | | WANG Lina | Pingliang Meteorological Bureau, Pingliang, Gansu 744000, China | | WANG Jinsong | Institute of Arid Meteorology,China Meteorological Administration,Key Laboratory of Arid Climatic Change and Reducing Disaster of Gansu Province, Key Laboratory of Arid Climatic Change and Reducing Disaster of CMA, Lanzhou, Gansu 730020, China |
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| Abstract: |
| To improve the accuracy of drought monitoring and quantitative disaster losses evaluation for winter wheat, a new comprehensive assessment index (WDI) for winter wheat drought damage in the semiarid loess plateau region Longdong was explored and established, using daily precipitation data and MCI index during 1965 to 2020, yield and drought disasters from 1978 to 2020, as well as observed data of winter wheat growth periods from 1981 to 2014 in 15 winter wheat planting counties. The drought index level was graded based on the relationship between drought index and yield loss due to drought, referring to the actual historical disasters. The spatial and temporal distribution characteristics of winter wheat drought in Longdong was analyzed based on WDI. The result showed that WDI was superior to meteorological drought index in assessment of winter wheat drought damage. From the interannual variation at 3 representative stations, the fluctuation range of WDI during growing season at Huanxian was the largest and the values was the lowest, the next was Xifeng, and fluctuation ranges of WDI at Huating was the smallest and the values was the highest. WDI floated sharply from the early 1990s to the early 21st century. From the decade’s variation, the WDI values of 1990s was the lowest in all decades and was relatively dry, in which the average WDI values of the whole growth period and jointing\|flowering period were -10.6 and -5.4, respectively. WDI of the 2010s was the highest in all decades and was in a relatively humid period, in which the average WDI values were 4.4 and 2.6, respectively. In terms of spatial distribution, the drought frequency increased from southeast to northwest, and drought above severe drought mainly occurred in the west and middle north of Longdong. The frequency of light\|moderate drought during the whole growth period and jointing\|flowering period were 34%~52% and 41%~57%, respectively, and the frequency above severe drought was 4%~18%. The assessment results were basically consistent with historical facts. Both biological and meteorological significance were considered in WDI, which can be used to characterize yield loss and spatial\|temporal analysis of winter wheat drought more accurately as well as for winter wheat drought monitoring and evaluating business. |
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