摘要
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。
This experiment was carried out by using self-designed devices for control of water supply tension as negative values. Some photosynthetic physiological characteristics of cowpea were measured. The result show when water supply tension was increased, soil water content was declining slowly; net photosynthetical rates（Pn）.transpiration rates（Tr） and stomatal conductances （Gs） rose at the beginning, and then went down with the peak values of P. and Gs were at the point of 20 hPa, however, Tr was under 30 hPa; Pn was positively correlated with Tr, and G, were positively correlated with Pn and Tr at 0.01 significant level as well; the actual photochemical quantum of PS Ⅱ （Yield） and photochemical quenching（qP） went up first and then dropped with the maximum under 20 hPa, and non-photochemcial quenching（qN） rose gently; the content of chlorophyll a（Chl a）.b（Chl b） and carotenoid（Car） in leaves went up first and then decreased gradually, and all the peak values occurred under 30 hPa; water use efficiency presented a double-peak curve with greater under high water supply tension.
出处
《灌溉排水学报》
CSCD
北大核心
2006年第5期72-74,88,共4页
Journal of Irrigation and Drainage
基金
国家自然科学基金(50479064)
关键词
负压灌溉
供水吸力
豇豆
negative pressure irrigation
water supply tension
cowpea
