| 马延庆,刘新生,刘长民,马文,王英.渭北旱塬近40年降水波动特征及作物干旱指标分析计算[J].干旱地区农业研究,2010,28(5):254~258 |
| 渭北旱塬近40年降水波动特征及作物干旱指标分析计算 |
| Weibei Plateau precipitation fluctuations in the past 40 years, characteristics and calculation of crop drought index analysis |
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| DOI：10.7606/j.issn.1000-7601.2010.05.47 |
| 中文关键词: 渭北旱塬 降水特征 干旱指标 |
| 英文关键词:Weibei plateau rain character dry index |
| 基金项目:咸阳市科技计划“咸阳市农业气象灾害监测预警与调控技术研究”项目 |
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| 中文摘要: |
| 利用陕西渭北地区24个气象台站1968～2007年40 a的逐日降水资料，分析了该区域近40 a降水波动特征。结果表明：渭北地区降雨量多年平均值在空间分布上呈“两高一低”型，由东向西逐渐增多；季节分布极不均匀，降水主要集中在夏秋两季，占全年降水的75%～80%；年际变化较为复杂，在24个测站中，呈上升趋势的有9个，呈下降趋势的3个，12个测站变化不明显，总体降水变化呈上升趋势。根据土壤水分平衡原理，提出了渭北旱塬农田土壤水分简易计算公式，计算分析了渭北旱塬主要农作物干旱指标。 |
| 英文摘要: |
| The use of Shaanxi Weibei area 24 meteorological stations, 1968～2007, 40 years of daily precipitation data, analysis of the fluctuations in regional precipitation characteristics of the past 40 years. The results showed that: Weibei area for many years the average rainfall distribution in space was “two high and one low” type, decreasing from west to east; seasonal distribution is uneven, precipitation mainly in summer and autumn, accounting for annual precipitation of 75%～80%; interannual variability is more complicated, in 24 stations in the upward trend of 9 stations, the downward trend in three stations, 12 stations did not change significantly. The overall trend of precipitation was upward. Based on the soil water balance principle, with soil moisture simple formula, Weibei plateau dryland drought index of major agricultural crops was calculated. |
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