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设定对照(CK,即常规生长)、轻度干旱(T1)、湿土壤(T2)和水淹(T3)4个处理组,研究枫杨(PterocaryastenopteraC.DC.)幼苗在不同土壤水分条件下的光合生理反应.研究显示不同土壤水分对枫杨幼苗叶片净光合速率、气孔导度、水分利用效率和光合色素含量等参数有不同影响.胁迫初期(25 d),植株的各项生理指标变化较小,T3净光合速率Pn比对照下降了25.4%.50天后,Pn下降比例大小为T1(60.3%)>T3(47.8%)>T2(28.1%),随后趋于稳定;蒸腾速率Tr和气孔导度Gs的变化趋势基本一致,T2和T3与对照无显著差异,T1则显著低于对照;T1有较高的水分利用效率(WUE),以对抗干旱缺水的逆境.T3光合色素含量持续处于最低状态,T1则与对照总体没有显著差异.各组叶绿素与类胡萝卜素含量之比界于4.475~6.920之间波动,而叶绿素a与叶绿素b的含量之比界于2.518~3.216之间波动.本实验证实枫杨幼苗兼具一定的耐水淹和耐旱的能力,也表明枫杨树种可用于三峡库区消落带的植被恢复构建.
Four treatment groups, CK (normal growth), mild drought (T1), wet soil (T2) and water flooding (T3), were set up to study the effects of Pterocarya tabacum C. DC. Seedlings under different soil moisture conditions Photosynthetic physiological response.The results showed that different soil moisture had different effects on the net photosynthetic rate, stomatal conductance, water use efficiency and photosynthetic pigment content in leaves ofPhenopsis pinnata seedlings.At the initial stage of stress (25 d), the changes of various physiological indexes (Pn) decreased by 25.4% .50 days later, the proportion of Pn decline was T1 (60.3%)> T3 (47.8%)> T2 (28.1%) and then stabilized. The transpiration rate Tr and Stomatal conductance Gs trends are basically the same, T2 and T3 and the control no significant difference, T1 was significantly lower than the control; T1 has a higher water use efficiency (WUE) to combat drought and water stress adversities .T3 photosynthetic pigment content The lowest and the lowest, T1 was not significantly different from the control overall.The chlorophyll content and carotenoid content of each group fluctuated between 4.475 and 6.920, while the chlorophyll a and chlorophyll b content ratio between the limits of 2.518 to 3.216 This experiment confirmed that both Poplar seedlings have some resistance to flooding and drought Force, but also that species can be used to build maple fluctuating Zone Three Reservoir vegetation.