摘要
在拔节、吐丝、灌浆不同生育阶段,通过用LI-6400便携式光合仪对不同N水平下玉米叶片的光合参数和环境因子进行测定,研究了水分利用率(WUE)分别与光合速率(Pn)、蒸腾速率(Tr)、气孔导度(Gs)、胞间CO2浓度(Ci)的关系。结果表明,在不同时期,NH处理下的WUE均比NL处理下的高。NH、NL处理下,WUE随Pn、Gs的升高而增加,当Pn、Gs分别超过23、22μmolCO2/(m2.s)和0.20、0.18 mol/(m2.s)时,WUE下降;而当Tr小于3.00 mmolH2O/(m2.s)时,2个N水平下的WUE均随Tr的升高而增加,当Tr超过此范围,2个N处理下的WUE均下降。
The photosynthesis parameter and environment factors of maize leaves were determined by LI-6400 portal photosyntometer at jointing, silk and filling stage under different N level to study the relation between water use efficiency and photosynthesis rate, transpiration rate, stomatal conductance, stomatal conductance, intercellular CO2 intensity. The results showed that the water use efficiency under high N level was higher than that under low N level at different growth stage, the water use efficiency increased with increase of photosynthesis rate and stomatal conductance and decreased when photosynthesis rate and stomatal conductance were above 23 μmolCO2/（m^2 · s） 22 μmolCO2/（m^2· s） and 0. 20 mol/（m^2 · s）,0. 18 mol/ （m^2· s） respectively under two N levels, and the water use efficiency increased with increase of transpiration rate when transpiration rate was below 3.00 mmol H2 O/（m^2 · s） and decreased when transpiration rate was above 3.00 mmol H2 O/ （m^2 · s）under two N levels.
出处
《贵州农业科学》
CAS
北大核心
2009年第3期27-29,共3页
Guizhou Agricultural Sciences
关键词
玉米
氮素
水分利用率
光合特性
maize
N nutrient
water use efficiency
photosynthesis characteristic
