灌水量对压砂地欧李光合作用及产量的影响

在田间试验条件下,选用农大5号为试供材料,以当地不灌水栽培的欧李为对照,研究了不同灌水量对压砂地欧李光合作用和产量的影响。结果表明:在不同灌水量处理条件下,欧李叶片气孔导度、蒸腾速率、光合速率和水分利用效率日变化均呈现典型的"双峰曲线"趋势,存在"午休"现象。欧李的光合作用和产量均随灌水量的增加而增加,处理1(450 m3/hm2)和处理2(225 m3/hm2)的净光合速率峰值比对照(不灌水)分别增加9.77%和3.50%;叶片水分生产效率峰值分别比对照增加5.28%和2.13%;产量分别比对照增加19.83%和6.96%。因此,在2015年现有降雨量和给定的灌水条件下,处理1(450 m3/hm2)为压砂地欧李较佳的灌溉定额。

Influence of Different Irrigation Amount on the Photosynthesis and Yield of Prunes Humilis in Gravel-mulched Field

Under the field experiment condition, choosing Nongda 5 as test material and comparing with the local Prunes humilis Bunge cultivated without irrigation, the effect of different irrigation amount on photosynthesis and yield of Prunes humilis Bunge in gravel-mulched field is studied.The results show that: under different irrigation amount conditions, the change of all the leaf stomatal conductance, transpiration rate, photosynthetic rate and water using efficiency of Prunes humilis Bunge show a typical double peak curve trend and there exists the phenomenon of "midday depression".The photosynthesis and yield of Prunes humilis Bunge increase with the increase of irrigation amount.Compared with the control (no irrigation) treatment, the net photosynthesis rate peak value of treatment 1 (450 m+3/hm+2) and treatment 2 (225 m+3/hm+2) respectively increase by 9.77％ and 3.50％, the leaf water production efficiency peak value respectively increase by 5.28％ and 2.13％, and the yield respectively increase by 19.83％ and 6.96％.Therefore, under the condition of existing rainfall and given irrigation amount of 2015, the treatment 1 (450 m+3/hm+2) is the better irrigation amount for prunes humilis Bunge in gravel-mulched field.