论文部分内容阅读
通过模拟测定不同矿化度咸水灌溉下红花罗布麻(Apocynum venetum)幼苗叶绿素荧光参数、叶水势和株高生长速率,研究了不同矿化度咸水灌溉对其适应性的调控。研究结果表明,随着灌水矿化度的增加,叶片样本的叶绿素含量呈先下降再升高的波动状态,叶水势基本保持稳定;光能的吸收、分配和耗散在10g.L-1达到平衡,株高生长速率在10g.L-1出现最大值9.8mm.d-1;随着胁迫时间的延长,表征健康程度的最大量子产率Fv/Fm下降,对溶液中金属离子的吸收增加;第21天,表征抗逆性大小的非光化学淬灭系数NPQ出现极大值,吸收能量比例参数Y(Ⅱ)先下降再恢复,3种能量吸收、分配、耗散参数比例在10g.L-1稳定于Y(Ⅱ):Y(NO):Y(NPQ)=65%∶20%∶15%。根据研究结果,建议在塔克拉玛干沙漠南缘红花罗布麻的育苗过程中,应该分阶段抚育,幼苗期宜采用5～10g.L-1矿化度的咸水灌溉,保持较高叶水势,可以防止叶绿素分解;采用10g.L-1的咸水灌溉可使其幼苗保持稳定的、较高的光化学能量转化比例,能够较好地调控其对塔克拉玛干沙漠南缘绿洲荒漠过渡带生境的适应性,有助于过渡带的恢复和建设。
The chlorophyll fluorescence parameters, leaf water potential and plant height growth rate of Apocynum venetum seedlings under different salinities of saline water were simulated to study the regulation of adaptability of salt water irrigation with different salinities. The results showed that the leaf chlorophyll content decreased first and then increased with the increase of irrigation salinity, and the leaf water potential basically remained stable. The absorption, distribution and dissipation of light energy reached 10g.L-1 The maximum growth rate of plant height was 9.8mm.d-1 at 10g.L-1. With the prolonging of stress time, the maximum quantum yield (Fv / Fm), which characterizes the health, decreased and the absorption of metal ions in the solution increased On the 21st day, the NPQ value of the non-photochemical quenching coefficient representing the magnitude of the resistance was maximum, and the parameter Y (Ⅱ) of the energy absorption decreased first and then recovered. The energy absorption, distribution and dissipation parameters of the three kinds of energy were 10g.L -1 Stable at Y (II): Y (NO): Y (NPQ) = 65%: 20%: 15%. According to the results of the study, it is suggested that Apocynum should be nurtured in stages during seedling raising of Apocynum sativa in the southern margin of the Taklamakan Desert. It is advisable to irrigate the saline water with a salinity of 5 ~ 10g.L-1 at the seedling stage, The chlorophyll content was reduced by 10g.L-1 saltwater irrigation, which could stabilize the seedlings of the Taklimakan Desert in the transitional zone of oasis desert in the Taklimakan Desert. The higher proportion of photochemical energy conversion, Contribute to the recovery and construction of the transition zone.