| Characteristics of meteorological drought and its impacts on crop yield in the Dongzhi Loess Tableland |
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| DOI：10.7606/j.issn.1000-7601.2018.02.29 |
| Key Words: Dongzhi Loess Plateau meteorological drought aridity index crop yield |
| Author Name | Affiliation | | ZHOU Hai-xiang | State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resource, Yangling, Shaanxi 712100, China
University of the Chinese Academy of Sciences, Beijing 100049, China | | HU Meng-jun | Northwest Normal University, Lanzhou, Gansu 730070, China | | LIU Wen-zhao | State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resource, Yangling, Shaanxi 712100, China
Northwest A&F University, Yangling, Shaanxi 712100, China | | NING Ting-ting | State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resource, Yangling, Shaanxi 712100, China
University of the Chinese Academy of Sciences, Beijing 100049, China |
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| Abstract: |
| Based on the daily meteorological data of Xifeng weather station during the period of 1955—2013 and the yield data of winter wheat, spring maize and potato from 1991 to 2013 in Dongzhi Loess Plateau, the characteristics of meteorological drought and its impacts on crop yield in this area were analyzed. The results showed following: (1) The inter-annual variations of precipitation and aridity index in the Dongzhi Loess Plateau fluctuated significantly in the last 60 years, and the fluctuations increased after 1985. Generally, the precipitation anomaly decreased slightly, but the aridity index (AI) showed a slightly increasing trend. The mean value of precipitation and aridity index were 550.6 mm and 1.81, respectively. In 1995, both negative precipitation anomaly and aridity index had the maximum values, which were -216.9 mm and 3.22 respectively. (2) The aridity index from August to September in the previous year had a significant effect on winter wheat yield, which demonstrated that the soil water storage before sowing had great influence on winter wheat yield. The yield of spring maize was affected remarkably (P<0.05) by the AI and precipitation in June and July, especially in July. Potato yield was significantly affected by the AI rather than precipitation in June. Furthermore, the crop yield was influenced not only by meteorological conditions, but also by crop varieties and management measures. |
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