| 摘要: |
| 介绍了应用时域反射仪（ＴＤＲ）测定作物需水量（ＥＴｃ）的原理和方法。根据冬小麦生育期内实测的ＥＴｃ以及用气象资料计算的参考作物蒸散量（ＥＴｃ），求得了冬小麦的作物系数（Ｋｃ），最后还用水面蒸发量（Ｅｐａｎ）的产测ＥＴｃ计算了需水系数，并给出了Ｋｃ－ｔ，α－ｔ在关系图，探讨了用α值估算作物需水量的可能性。 |
| 关键词: 时域反射仪 作物需水量 作物系数 土壤水分 |
| DOI： |
|
| 基金项目:国家自然科学基金，“八五”重大项目!49391600 |
|
| Measurement of Crop Water Requirements and Crop Coefficients Using Time Domain Reflectometry |
|
|
|
| Abstract: |
| The principles and methodology of measurement of crop water requirements (ETc) by time domain reflectometry (TDR) technique were presented in this paper. The crop coefficients (Kc) of winter wheat were obtained, based on the measured ETc by TDR in the field and calculated reference crop evapotranspiration (ETo) with meteorological data. The adjustment factors (a) were calculated with pan evaporation (Epan) and ETc. Finally, the validity of estimation of crop water requirements by a value were discussed. |
| Key words: time domain reflectometry,crop water requirement,crop coefficient, |
