水肥(氮)对小麦生理生态的影响 (Ⅱ )水肥 (氮 )对小麦叶片细胞间隙CO_2 浓度和气孔导度的影响  

Physiolycial and Ecological Responses of Wheat Leaves to Soil Water and Nitrogen (Ⅱ)Effects of Soil Water and Nitrogen on Stoma of Wheat Leaves

作　　者：李卫民[1] 周凌云[1] 

机构地区：[1]中国科学院南京土壤研究所

出　　处：《土壤通报》2004年第3期271-274,共4页Chinese Journal of Soil Science

基　　金：国家重点基础发展规划项目(G1999011803);国家自然科学基金项目(49890330)资助

摘　　要：小麦叶片细胞间隙CO2浓度Cint全天最高值出现在早上,其日变化曲线呈"　　"型。Cint日变化在9:00后,大致呈现随施氮量增加而下降的趋势。在午前,低水处理Cint日变化较高水处理要高,午后则下降到较低的位置。各处理Cint时段变化随施氮量增加而下降,土壤水胁迫处理Cint各时期最低。小麦叶片气孔导度(Gs)在中午达到峰值,其日变化呈现"W"字型。4月20日Gs最高。Gs日变化随施氮量的增加而下降;低水叶片Gs在上午相对较高,下午则相反。Gs时段变化,低氮处理相对较高,高水与胁迫处理Gs较其它处理显著降低。The maximum value of intercellular CO_2 concentration appeared in the mornings and its diurnal curves appeared as ''. With increasing nitrogen supply, intercellular CO_2 concentration began falling at 9.am. Intercellular CO_2 concentration of lower soil water treatment was higher at noon than the others. Stomatal conductance of wheat leaves reached its peak value at mid-day and showed curves as 'W'. The maximum value of stomatal conductance of wheat occurred on April 20. Diurnal stomatal conductance reduced with increasing nitrogen rate, but it was contrary at growth stages. Stomatal conductance was higher with lower soil water control at noon, but it reversed in afternoon. At grow stages, higher and lower soil water content made stomatal conductance lower than the others.

关 键 词：小麦 生理特性 生态特性 土壤水分 氮肥 细胞间隙二氧化碳浓度 气孔导度 

分 类 号：S512.1[农业科学—作物学]