Climate Suitability Evaluation of Winter Wheat in Semi-Arid Area of Loess Plateau:A Case Study of Tongwei County
Climate suitability can represent the degree of influence of climate conditions on crop growth and development.Based on the meteorological data and agricultural meteorological observation data of the last 40 years in Tongwei County in the semi-arid region of the Loess Plateau,and the fuzzy mathematical method,the climate suitability of winter wheat during the whole growth period in semi-arid rain-fed agricultural area of Loess Plateau was evaluated according to the requirements of temperature,moisture and light in each development period of winter wheat.The results showed that the temperature suitability of winter wheat during the whole growth period in Tongwei County was 0.58 in the past 40 years,and the temperature suitability of winter wheat during the overwintering period was the highest(0.95).The temperature suitability of three-leaf stage to overwintering stage was low(-0.42),and the inter-annual difference was small.The temperature suitability of winter wheat during the whole growth period increased at a rate of 0.019/10a.Water suitability was 0.46,the highest water suitability was 0.66 for filling stage to ripening,followed by 0.63 for re-greening to jointing,and the water suitability increased at a rate of 0.017/10a during the whole growth period.The light suitability was 0.62,the highest light suitability was 0.68 from overwintering stage and re-greening stage to jointing stage,and the lowest was 0.51 from filling stage to maturity stage.The light suitability increased by 0.011/10a in the whole growth stage.The comprehensive suitability was 0.54,the highest was 0.70 at the re-greening to jointing stage,and the lowest was-0.36 at the three-leaf to overwintering stage.The comprehensive suitability increased at the rate of 0.014/10a during the whole growth period.Yield was significantly correlated with temperature suitability from heading stage to milk maturity stage,water suitability from milk maturity stage to maturity stage and comprehensive suitability from filling stage to maturity stage.The climatic suitability can accurately reflect the change of meteorological conditions during the growing period of winter wheat in the semi-arid of the Loess Plateau.
semi-arid area of Loess Plateauwinter wheatclimate suitabilityevaluation indicator
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NSTL
万方数据
