分根区施保水剂对玉米气孔导度和单叶WUE的影响

盆栽条件下,研究了陕单9号玉米(zea mays L．)在根区不施保水剂(对照)、分根区施保水剂和根区全施保水剂3种处理下,叶片气孔导度、CO2吸收和H2O蒸腾的变化。结果表明,在75％土壤饱和持水量下,各指标在3种处理之间没有明显差别;在50％土壤饱和持水量下,分根区施保水剂显著降低了叶片气孔导度,叶片CO2吸收量和H2O蒸腾量也同时降低,但H2O蒸腾量下降幅度更大;在两种水分条件下,分根区施保水剂均能提高玉米单叶水分利用效率(water use efficiency,WUE)。

Effects on leaf stomatal conductance and single leaf water use efficiency of maize by aquasorb rootzone-divided use

Leaf stomatal conductance,CO_2 absorption and H_2O transpiration of maize ( Zea mays L.) "Shaandan 9" were studied in potted experiment between control (no aquasorb applying),aquasorb rootzone-divided use,and aquasorb roorzone use fully.The results indicated that there was no evident difference in leaf stomatal conductance,CO_2 absorption and H_2O transpiration under 75% soil saturated capacity.And under 50% soil saturated capacity,leaf stomatal conductance decreased evidently,and the volume of CO_2 absorption and H_2O transpiration both decreased as well but the H_2O transpiration reduced with more extent.Aquasorb rootzone-divided use promoted single leaf water use efficiency (WUE) of maize under two water conditions.