供水吸力对黄瓜若干生理指标的影响

采用一种自制装置,通过设置一系列供水吸力水平精确控制土壤的含水量,在此基础上采取盆栽的方式对黄瓜的生育进程、生物量积累、水分利用效率以及根冠比等生长状况及生理指标进行观测研究。结果表明当供水吸力大于1 hPa后,随着供水吸力的增大,植株体的生育进程逐步减缓,雌雄花数目逐渐减少,各器官生物量积累也逐渐变少;植株体和产量水分利用效率在供水吸力1~20 hPa的范围内随着供水吸力的增大而增大;植株体水分利用效率在供水吸力20~80 hPa范围内呈下降趋势,而产量水分利用效率在此供水范围内基本上不变;植株体和产量水分利用效率在供水吸力80~130 hPa的范围内都呈下降趋势。供水吸力小于20 hPa,根冠比呈上升趋势,当供水吸力超过20 hPa后,根冠比基本保持不变。

Influence of water supply tension to some physiological parameters of cucumber

The experiment was carried out by using self-designed devices for control of water supply tension,and the growth process,biomass accumulation,water use efficiency(WUE) and root/shoot ratio(R/S) of cucumber were measured.The results showed that the growth process of cucumber was slowed down progressively,the number of staminate or pistillate flowers was decreased,and the biomass accumulation of various organs was reduced with water supply tension rising.The plant WUE and fruit WUE were positively corresponded with water supply tension in the scope of 1~20 hPa;when water supply tension was within 20~80 hPa,the plant WUE was negatively corresponded with it and the yield WUE was basically stable;when water supply tension exceeded 80 hPa,the plant WUE and yield WUE were all negatively corresponded with it.R/S was positively corresponded with water supply tension when it was below 20 hPa;R/S was relatively stable when water supply tension exceeded 20 hPa.