| 河西走廊东部土壤水分变化特征及预测 |
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| 引用本文： | 钱莉,张惠玲,刘明春,杨晓玲. 河西走廊东部土壤水分变化特征及预测[J]. 干旱地区农业研究, 2005, 23(4): 58-63 |
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| 作者姓名： | 钱莉 张惠玲 刘明春 杨晓玲 |
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| 作者单位： | 中国气象局兰州干旱气象研究所,甘肃,兰州,730020;甘肃省武威市气象局,甘肃,武威,733000;甘肃省干旱气候变化与减灾重点实验室,甘肃,兰州,730000;甘肃省武威市气象局,甘肃,武威,733000 |
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| 基金项目： | “西部开发科技行动”重大项目“祁连山空中云水资源开发利用研究”(2004BA901A16) |
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| 摘 要： | 使用统计方法对河西走廊东部武威市农耕期耕作层土壤水分的地域分布、时间演变和垂直变化等特征进行了分析。结果表明:土壤水分存在三种地域分布区,时空分布具有明显的季节性;土壤水分的散失与日照、气温、降水、地温等气象条件的变化有较大关系。尝试用最优子集神经网络建立春季土壤水分预测模型,经实际使用,该模型预测能力较强,效果好。
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| 关 键 词： | 土壤水分 分布特征 最优子集 BP人工神经网络 预测模型 |
| 文章编号： | 1000-7601(2005)04-0058-06 |
| 修稿时间： | 2004-10-22 |
Variation characteristic and prediction of soil humidity in eastern Hexi Corridor |
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| QIAN Li,ZHANG Hui-ling,Liu Ming-chun,YANG Xiao-ling. Variation characteristic and prediction of soil humidity in eastern Hexi Corridor[J]. Agricultural Research in the Arid Areas, 2005, 23(4): 58-63 |
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| Authors: | QIAN Li ZHANG Hui-ling Liu Ming-chun YANG Xiao-ling |
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| Abstract: | The regional distribution, temporal evolvement and uprightness variation of soil humidity in plow layer during farming period in eastern Hexi Corridor is analyzed with statistical method. It is shown that there are three zones of soil humidity, and there is a remarkable seasonal change for the spatio-temporal distribution of soil humidity. The diminution of soil humidity is clearly related to the change of meteorological conditions such as air temperature, precipitation, sunlight and ground temperature. A prediction model of soil humidity in spring is established by using the method of optimization subclass neural network. This model may provide decision-making gist to combat drought calamities and improve the utilization of water resource. |
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| Keywords: | soil humidity distribution characteristic optimization subclass BP artificial neural network prediction model |
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