吉林省春玉米生長期干旱指標(biāo)研究
[Abstract]:[objective] to provide a reference and meteorological basis for the formulation of countermeasures and measures for disaster prevention and mitigation of spring maize in Jilin Province by determining the drought index of spring maize. [methods] based on the main planting areas of spring maize in Jilin Province (Gongzhuling, Nong'an), Based on the historical meteorological data of elm, the adaptability of local spring maize planting climatic conditions was analyzed by parallel analysis, and the trend yield was simulated by cubic polynomial fitting, and the meteorological yield was separated. The Pearson correlation between relative meteorological yield and different ten days precipitation in development period was analyzed, and drought index of spring corn was constructed by using precipitation, negative anomaly of precipitation and dryness degree. [results] (1) in the whole growth period of spring maize, except for milk-ripening stage, the temperature conditions were lower, and the other light and heat conditions could basically meet the requirements of each development period. The main factors affecting yield are precipitation conditions (2) through the comparison of the annual precipitation of spring maize in three lands, the average precipitation drought index of spring maize at each development stage is 112.8 mm; at emergence and jointing stage, 102.9 mm; at jointing stage and 102.9 mm; in heading stage. The ripening stage was 139.6 mm; milk-ripening and maturing stage was 32.2 mm; (3). The negative distance of precipitation and the degree of dryness were taken as the index. The drought indexes of light drought, moderate drought, heavy drought and special drought in the whole growth period of spring maize in three areas were obtained from the yield reduction rate; (4) the drought indexes of light drought, moderate drought, heavy drought and special drought were obtained by taking dryness degree as the index; (5) Gongzhuling was at high risk of drought. The comprehensive drought risk index of elm is between Gongzhuling and Nongzhuling. [conclusion] according to drought indexes and local conditions, the agricultural sector can formulate targeted drought response measures. So as to improve the yield and quality of maize.
【作者單位】: 成都信息工程大學(xué)大氣科學(xué)學(xué)院高原氣象與環(huán)境四川省重點實驗室;吉林省氣象局;
【基金】:科技部公益性行業(yè)(氣象)科研專項(GYHY201506001)資助
【分類號】:S513;S423
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