期刊论文

中文

干旱地区农业研究

1000-7601

2004

04

28-32

国家重点基础研究专项（G1999011707）； 国家自然科学基金重点项目（30230230）； 面上项目（30070429;40201028）资助。；

本校为其他机构

以玉米为供试作物,在遮雨棚内进行了微区田间试验,在不同水分与供氮条件下,分期测定了玉米自由水与束缚水比值和细胞汁液浓度、气孔导度和细胞间隙CO2浓度、核酮糖-1,5二磷酸羧化酶(RuBPCase)活性和叶绿素含量、以及叶片的光合速率和作物产量,研究供氮对玉米光合作用有关生理特性的影响.结果表明,氮素对光合生理特性的影响受水分供应状况的制约:水分供应较好时,供氮提高了叶片自由水与束缚水比值,降低了叶肉细胞汁液和细胞间隙CO2浓度;增加了气孔导度,提高了RuBPCase活性和叶绿素含量,既有利于改善气孔因素,也有利于改善非气孔因素,显著提高光合速率和作物产量.水分胁迫较轻时,供氮降低了气孔导...

A field experiment with micro-plots was conducted under rain-preventing condition for studying the effects of N supply on some physiological characteristics related with photosynthesis of maize. With application of different rates of N and water, determinations were made for the ratio of free water to bound water in leaves, cell sap concentrations, stomatal conductance, intercellular CO_2 concentrations, RuBPCase activity, chlorophyll contents, leaf photosynthesis rate at different time, and finally the biomass yields. The results showed that the effect of N on photosynthesis was determined by...