引用本文: | 花佳程,朱永华,王振龙,等.淮北平原冬小麦作物系数的变化规律研究[J].灌溉排水学报,0,():-. |
| Hua Jiacheng,Zhu Yonghua,Wang Zhenlong,et al.淮北平原冬小麦作物系数的变化规律研究[J].灌溉排水学报,0,():-. |
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摘要: |
【目的】为了研究淮北平原冬小麦作物系数的时空变化规律。【方法】采用水量平衡法、涡度相关法和Bouchet互补关系理论,结合Penman-Montieth方程,计算得到1991—2018年淮北平原冬小麦的作物系数;采用线性拟合法、Mann-Kendall趋势检验法、Mann-Kendall突变检验法和滑动t检验法,结合ArcGIS,研究了作物系数在淮北平原的时空变化规律,并对影响因素进行分析。【结果】结果1淮北平原冬小麦全生育期的实际蒸散量的多年平均值为429.3 mm,参考作物蒸散量为541.3 mm,作物系数为0.79;结果2作物系数在不同生育阶段的变化为先减小后增大再减小;结果3作物系数在淮北平原全生育期由西北角向周围逐渐增大,高值中心呈现北移趋势;结果4作物系数与气候因子紧密相关,其中气温的影响最为显著,相对湿度和降水次之,风速最不显著。【结论】计算得到淮北平原冬小麦不同生育阶段的作物系数,为灌溉需水量的计算提供理论依据;研究发现作物系数存在显著上升趋势,与气候因子关系紧密,需要关注作物需水量的变化。 |
关键词: 物系数;实际蒸散量;参考作物蒸散量;淮北平原;冬小麦 |
DOI: |
分类号:S274 |
基金项目:国家自然科学基金项目(面上项目,重点项目) |
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Study on Variation of Crop Coefficient of Winter Wheat in Huaibei Plain |
Hua Jiacheng, Zhu Yonghua, Wang Zhenlong, Lv Haishen
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Hohai University
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Abstract: |
【Objective】In order to study the temporal and spatial variation of crop coefficient of winter wheat in Huaibei Plain. 【Method】Using water balance method, eddy covariance method and Bouchet complementary relationship theory, combined with Penman-Montieth equation, the crop coefficient of winter wheat in Huaibei Plain from 1991 to 2018 was calculated. Using linear fitting method, Mann-Kendall trend test, Mann-Kendall jump test and moving t-test, combined with ArcGIS, the temporal and spatial variation of crop coefficients in the Huaibei Plain was studied and the influencing factors was analyzed. 【Results】The annual mean value of actual evapotranspiration during the whole growth period of winter wheat in Huaibei Plain is 429.3 mm; the reference crop evapotranspiration is 541.3 mm; and the crop coefficient is 0.79. The crop coefficient at different growth stages decreases first then increases and finally decreases. The crop coefficient gradually increases from the northwest corner to the surroundings during the whole growth period of the Huaibei Plain, and the high value center shows a northward shift. The crop coefficient is closely related to the climate factor. The effect of temperature is the most significant , followed by relative humidity and precipitation, and the effect of wind speed is the least significant. 【Conclusion】The calculated crop coefficient of winter wheat at different growth stages in the Huaibei Plain provided a theoretical basis for the calculation of irrigation water requirements. The study found that the crop coefficient has a significant upward trend, which is closely related to climate factors; so changes of crop water requirements need to be paid attention to. |
Key words: crop coefficient; actual evapotranspiration; reference crop evapotranspiration; Huaibei Plain; winter wheat |