不同水分条件下旱稻水分利用效率的研究

Study on the water use efficiency of upland rice in different watert reatments

田间试验研究不同水分条件下旱稻水分利用效率结果表明 ,“旱稻 50 2”、“津稻 3 0 5”拔节期和开花期净光合速率、蒸腾速率及水分利用效率日变化规律一致 ,叶片净光合速率和蒸腾速率均呈中间高、两头低变化趋势 ,水分利用效率均呈“L”型趋势。充分灌溉和水分胁迫处理“旱稻 50 2”叶片水分利用效率均大于“津稻 3 0 5”。“旱稻50 2”和“津稻 3 0 5”农业用水 (灌溉 +降水 )水分利用效率均低于灌溉水水分利用效率 ,2品种水分胁迫处理下灌溉水水分利用效率均高于充分灌溉处理 ,“津稻 3 0 5”农业用水和灌溉水水分利用效率均低于“旱稻 50 2”。

Through field experiment, the water use efficiency of up land rice in different water treatments was studied. The results show that diurn al changes of photosynthesis rate, transpiration rate and the water use efficien cy of “Upland rice 502”and “Jindao 305”are similar in elongation and flowering stage. Both photosynthesis rate and transpiration rate are higher in the middle of the day than any other times. The diurnal change of water use efficiency loo ks like a `L'. The water use efficiency of “Upland rice 502”is higher than tha t of “Jindao 305” under enough irrigation and water deficit treatments. The wa ter use efficiencies of agricultural water consumption of “Upland rice 502” an d “Jindao 305” are lower than those of irrigation, especially water use effici e ncies of the two varieties under water deficit condition are higher than those o f under enough irrigation respectively. Water use efficiencies of agricultural w ater consumption and irrigation of “Jindao 305”are lower than those of “Uplan d rice 502”.