黄土高原露日数变化趋势分析
发布时间：2018-07-17 07:10
【摘要】：露日数是预防和控制植物病害的重要因子,探讨气候变化条件下露日数,可为区域植物病害预测及防治提供事实依据。本文基于52个气象站点1961—2010年逐日监测气象数据,计算了黄土高原不同时空尺度的露日数,利用去趋势预置白处理(trend-free pre-whitening,TFPW)的Mann-Kendall法和Sen趋势度估计法(Sen’slope)分析了露日数变化趋势,并借助相关分析法探讨了露日数的成因。结果表明,在月尺度上,黄土高原露水发生在3—11月,全区域月平均值为7 d,9月露日数最长,其中南部、东南部和西北部露日数达8~12 d。5.77%~25.00%气象站点露日数在6月和8—11月以0.02~0.15 d×a~(-1)显著增加,17.31%和7.68%气象站点露日数在4月和7月以-0.09 d×a~(-1)和-0.02 d×a~(-1)显著降低。在季尺度上,黄土高原露水发生在春、夏和秋季,全区域季平均值为15 d,秋季露日数最长,其中南部、东南部和西北部露日数达14~26 d。仅3.85%和5.77%的气象站露日数在夏季、秋季分别以0.25~0.09 d×a~(-1)和0.15~0.09 d×a~(-1)显著增加,5.77%的气象站露日数在春季以-0.34~-0.07 d×a~(-1)显著降低。相对湿度和温度是影响上述露日数时空变化的最关键因子。
[Abstract]:The number of dew days is an important factor for the prevention and control of plant diseases. The study of dew days under climate change conditions can provide a factual basis for the prediction and control of regional plant diseases. Based on the daily monitoring meteorological data of 52 meteorological stations from 1961 to 2010, the number of exposed days at different space-time scales in the Loess Plateau is calculated. Using the Mann-Kendall method and the Sen trend estimation method of trend-free pre-whitening TFPW, the variation trend of dew days is analyzed, and the causes of dew days are discussed by means of correlation analysis. The results show that, on a monthly scale, dew occurred in the Loess Plateau from March to November, with a monthly average of 7 days in the whole region and the longest dew days in September, especially in the southern part of the region. The number of dew days in the southeast and northwest reaches 812 d.5.77% and 25.00% in June and August and November. The number of days exposed to meteorological stations increases by 17.31% and 7.68% by -0.09 d 脳 a ~ (-1) and -0.02 d 脳 a ~ (-1) in the month of June and August to November, and decreases significantly by -0.09 d 脳 a ~ (-1) and -0.02 d 脳 a ~ (-1) in April and July. On the seasonal scale, dew occurred in spring, summer and autumn. The seasonal average value of the whole region was 15 days, and the autumn dew days were the longest, and the number of dew days in the south, southeast and northwest of the Loess Plateau reached 14 ~ 26 days. Only 3.85% and 5.77% of the weather stations had a significant increase in the number of dew days in summer. In autumn, the number of dew days increased by 5.77% at 0.25 ~ 0. 09 d 脳 a ~ (-1) and 0.15 ~ 0. 09 d 脳 a ~ (-1), respectively. In spring, the number of dew days of weather stations decreased significantly by -0.34 ~ (-0.07) d 脳 a ~ (-1). Relative humidity and temperature are the most important factors affecting the spatiotemporal variation of dew days.
【作者单位】： 杨凌职业技术学院水利工程分院;西北农林科技大学水利与建筑工程学院/中国科学院教育部水土保持与生态环境研究中心;水利部发展研究中心;
【基金】：国家科技支撑计划项目(2015BAC01B03) 陕西统筹项目(2014KTCG01-03)资助~~
【分类号】：S161
，
本文编号：2129542
[Abstract]:The number of dew days is an important factor for the prevention and control of plant diseases. The study of dew days under climate change conditions can provide a factual basis for the prediction and control of regional plant diseases. Based on the daily monitoring meteorological data of 52 meteorological stations from 1961 to 2010, the number of exposed days at different space-time scales in the Loess Plateau is calculated. Using the Mann-Kendall method and the Sen trend estimation method of trend-free pre-whitening TFPW, the variation trend of dew days is analyzed, and the causes of dew days are discussed by means of correlation analysis. The results show that, on a monthly scale, dew occurred in the Loess Plateau from March to November, with a monthly average of 7 days in the whole region and the longest dew days in September, especially in the southern part of the region. The number of dew days in the southeast and northwest reaches 812 d.5.77% and 25.00% in June and August and November. The number of days exposed to meteorological stations increases by 17.31% and 7.68% by -0.09 d 脳 a ~ (-1) and -0.02 d 脳 a ~ (-1) in the month of June and August to November, and decreases significantly by -0.09 d 脳 a ~ (-1) and -0.02 d 脳 a ~ (-1) in April and July. On the seasonal scale, dew occurred in spring, summer and autumn. The seasonal average value of the whole region was 15 days, and the autumn dew days were the longest, and the number of dew days in the south, southeast and northwest of the Loess Plateau reached 14 ~ 26 days. Only 3.85% and 5.77% of the weather stations had a significant increase in the number of dew days in summer. In autumn, the number of dew days increased by 5.77% at 0.25 ~ 0. 09 d 脳 a ~ (-1) and 0.15 ~ 0. 09 d 脳 a ~ (-1), respectively. In spring, the number of dew days of weather stations decreased significantly by -0.34 ~ (-0.07) d 脳 a ~ (-1). Relative humidity and temperature are the most important factors affecting the spatiotemporal variation of dew days.
【作者单位】： 杨凌职业技术学院水利工程分院;西北农林科技大学水利与建筑工程学院/中国科学院教育部水土保持与生态环境研究中心;水利部发展研究中心;
【基金】：国家科技支撑计划项目(2015BAC01B03) 陕西统筹项目(2014KTCG01-03)资助~~
【分类号】：S161
，
本文编号：2129542
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