摘要
2006年天水农业气象试验站在自然状态下进行了土壤水分的消退试验,根据试验数据,揭示了土壤水分的消退规律。结果表明,从最适宜土壤湿度的上限开始,土壤含水量随时间的消退为对数曲线。从最适土壤水分含量的上限到下限需5 d时间,土壤失水速度为13.4 mm/d;从轻旱上限消退至严重干旱需20 d时间,土壤水分散失速度为3.9 mm/d。在此基础上建立了100 cm土层土壤含水量的预测模型及土壤干旱预警模型,经不同降水年型土壤水分实测值的检验表明,土壤含水量预测模型准确率较高,土壤干旱预警模型在预测不同程度的土壤干旱时准确率比较高,有一定实用性。
We made an experiment of soil water consuming at the Agrometeorological Experiment Station of Tianshui in 2006.Based on the test data,the characteristics of soil moisture depletion under natural condition was studied.The results showed that the soil moisture depletion turned out a logarithmic curve with time beginning from the most suitable point.The duration of soil moisture decreasing from the highest limit of optimum to the lowest limit was 5 days,with a speed of 13.4 mm a day.From light drought to serious drought it needed 20 days,and the ratio of soil water consuming was 3.9 mm a day.Based on these results,we established the models to forecast soil moisture and warn drought.The models showed high accuracy by testing with measured values,and they had a certain degree of practicality.
出处
《干旱地区农业研究》
CSCD
北大核心
2010年第3期254-258,共5页
Agricultural Research in the Arid Areas
基金
中国气象局兰州干旱气象研究所干旱气象基金(IAM200803)
国家科技部公益行业(气象)科研专项"西北地区旱作农业对气候变暖的响应特征及其预警和应对技术研究"(GYHY200806021)
关键词
土壤水分
旱情
预测
模型
黄土高原
soil moisture
drought
forecasting
model
loess plateau
