• 论文 •

### 麦田蒸腾需水量的计算模式

1. 中国科学院地理研究所, 北京　100101
• 出版日期:1997-11-15 发布日期:1997-11-15
• 基金资助:
国家自然科学基金

### A CALCULATION MODEL ABOUT TRANSPIRATION-WATER REQUIREMENT IN WHEAT FIELD

Xie Xianqun, Wu Kai

1. Institute of Geography, Chinese Academy of Sciences , Beijing 100101
• Online:1997-11-15 Published:1997-11-15

Abstract: According to the study using Penman Monteith method, this paper gives an improved model for the calculation of transpiration water requirement in the well irrigated wheat field, it is CWR= [Δ（Rn-Rsn ）+ρC p/rac]/[Δ+γ(1+rST/rac)]and the author makes some correction for the parameters in the model, such as racand rSTrac =ra[1+φH/[ln(z-d)/z0]]where φH is function of stability of boundary layer depending on Richardson number Ri , rST =rS/LAI , where the LAI is Leaf area indix and rS is the minimum stamatal resistance of leaf on the top of Canopy. The testing result in the field at Yucheng Experimental Station shows that the mean value of the minimum stamatal resistance of canopy is about 40 s/m-60 s/m in the whole wheat growing season, the mean value of aerodynamic resistance of boundary layer is about 50 s/m in the full wet soil moisture condition, but it changes with the weather. The values of CWR of well irrigated field is close to the ET in the field and the values of T on the non full wet field are only 76% of ET . It means the given model in well irrigated condition is good to be used.

• P333