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试验采用一种自制装置,在负压灌溉原理的基础上,通过设置一系列供水吸力梯度,结合盆栽方式对豇豆某些光合生理特性进行了研究。结果表明:随着供水吸力的增大,土壤含水量逐渐减少;净光合速率(Pn)、蒸腾速率(Tr)和气孔导度(Gs)先上升后下降,Pn、Gs在吸力为20 hPa时达到最大而Tr在吸力为30 hPa时最大,Pn与Tr呈显著的正相关性,Gs与Pn、Tr都呈显著的正相关性;实际光化学量子产量(Yield)和光化学淬灭(qP)先增大后减小,峰值出现在20 hPa,非光化学淬灭(qN)逐渐升高;叶绿素a(Chl a)、叶绿素b(Chl b)和类胡萝卜素(Car)的含量是先上升后下降,在吸力为30 hPa时都达到最大;叶片水分利用效率(WUE)呈双峰曲线,高吸力下的WUE较大。
Based on the principle of negative pressure irrigation, a series of self-made devices were used to study some photosynthetic physiological characteristics of cowpea by setting a series of suction gradient of water supply and potting. The results showed that with the increase of water supply suction, the soil water content decreased gradually. The net photosynthetic rate (Pn), transpiration rate (Tr) and stomatal conductance (Gs) firstly increased and then decreased, while Pn and Gs decreased at 20 hPa Tr at the maximum of 30 hPa, positive correlation between Pn and Tr, and significant positive correlation between Gs and Pn and Tr. The actual photochemical quantum yield (Yield) and photochemical quenching (qP) The content of chlorophyll a (Chl a), chlorophyll b (Chl b) and carotenoid increased at first and then decreased , Reached the maximum at 30 hPa suction. The leaf water use efficiency (WUE) showed a double peaked curve and the WUE under high suction was larger.