基于改进的SEBS模型的作物需水量研究

为了探讨以蒸散发为基础的作物需水量情况,便于为农业生产提供数据支持,利用风云三号、风云二号气象卫星数据,结合自动站气象数据,基于改进的SEBS模型对山西省进行作物需水量研究。结果表明:通过与实测数据对比验证发现模型结果精度较高。山西省2012年3—9月全省日均作物需水量最大值出现在春季的5月份,为1.27 mm,其中,以单季作物为代表的晋东北和中西部日均作物需水量最大值均出现在5月,分别为1.05 mm和1.38 mm;以双季作物为代表的晋东南日均作物需水量最大值出现在5月和7月,分别为1.28 mm和1.23 mm。可见山西省作物需水量普遍以春季最大,其中尤以中西部突出,晋东北则相对最低。

Analysis of crop water requirement based on refined SEBS model

In order to study the crop water requirement on the basis of evapotranspiration, and provide data support for agriculture production, a refined SEBS based model with remote sensing date from FY3A/3B and FY/2E satellite and the meteorological date from automatic meteorological stations were used to monitor crop water requirement in Shanxi Province. The results indicated that outcomes from the model showed high consistency with the experimental data. It was shown that, maximal value (1.27 mm) of crop water requirement in Shanxi province during 2012 appeared in the spring of May. In addition, the maximal average values of crop water requirement in northeast and midwest of Shaanxi appeared in May, as 1.05mm and 1.38 mm, respectively. In southeast of Shanxi, the maximal value appeared in both May and July, as 1.28 mm and 1.23 mm, respectively. Thus crop water requirement in Shanxi province reached the most in spring. Particularly, midwest area demanded more, while northeast area needed less.