| 陇中黄土高原降水资源趋势变化 |
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| 引用本文： | 张萍,李广.陇中黄土高原降水资源趋势变化[J].草业科学,2008,25(6):24-28. |
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| 作者姓名： | 张萍 李广 |
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| 作者单位： | 甘肃农业大学信息科学技术学院,甘肃,兰州,730070;甘肃农业大学信息科学技术学院,甘肃,兰州,730070 |
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| 摘 要： | 根据陇中地区1958-2000年日降水资料,采用气候倾向率、趋势系数等统计分析方法对该地理区域降水的空间、时间的分布特征以及变化趋势进行分析.结果表明,降水量的纬度效应不明显,而与海拔呈显著正效应,与经度呈显著负效应;区域降水多集中在夏末与秋初,且变率较大(为21%～63%),春季严重干旱的发生频率较为频繁,无效降水多,降水利用率低;近40年降水呈减少趋势,并且减少幅度高于全国的平均值,但整体减少幅度较小.
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| 关 键 词： | 陇中 降水 季节动态 年动态 趋势 |
Variations of precipitation resource tendency in Central Gansu |
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| ZHANG Ping,LI Guang.Variations of precipitation resource tendency in Central Gansu[J].Pratacultural Science,2008,25(6):24-28. |
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| Authors: | ZHANG Ping LI Guang |
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| Abstract: | The spatial and temporal distribution and variation tendency of precipitation in central Gansu were analyzed according to daily rainfall data during 1958-2000,by means of climate tendency rate and tendency coefficient.The results showed that precipitation had no significant correlation to latitude,but positively correlated to altitude and negatively correlated to longitude.Precipitation mainly concentrated in late summer and early autumn with a big variation(21%-63%).Severe drought mainly happened in spring,with more ineffective rainfall and low use efficiency.The precipitation tended to decline during last 40 years,and the reduction was higher than national average level.But the total reduction range was lower. |
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| Keywords: | Central Gansu precipitation seasonal variation annual variation tendency |
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