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（ETo），求得了冬小麦的作物系数（Kc）。最后还用水面蒸发量（Epan）和实测ETc计算了需水系数（α），并给出了Kc～t、α～t的关系图，探讨了用α值估算作物需水量的可能性。
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.
出处
《中国农业大学学报》
CAS
CSCD
北大核心
1998年第5期61-67,共7页
Journal of China Agricultural University
基金
国家自然科学基金
"八五"重大项目!49391600
关键词
时域反射仪
作物需水量
作物系数
土壤水分
time domain reflectometry
crop water requirement
crop coefficient
