摘要
建立了包括植物体内的水分传输,并有根源ABA参与的气孔调节模型,模拟了饱和水气压差(VPD)、气温、表层土壤含水量(θ_(s1))等环境因子对叶片水势、木质部汁液中ABA浓度([ABA]_x)及气孔导度的影响。结果显示,VPD和气温的变化能够改变叶片水势及气孔导度;[ABA]_x几乎不受VPD和气温变化的影响,却决定着叶片水势及气孔导度对VPD和气温变化的响应幅度;θ_(s1)影响[ABA]_x,并由此影响气孔导度,但相比之下对叶片水势的作用并不显著。
A steady-state model of stomatal regulation has been developed, which includes a water flow system involving the effect of root-originated ABA. The influences of vapour pressure deficiency (VPD), air temperature and water content in the uppermost soil layer on leaf water potential, ABA concentration in xylem sap ([ABA]x) and stomatal conductance had been simulated. The results show that changes in VPD and air temperature affect the leaf water potential and stomatal conductance, in which the [ABA]x played a decisive role in controlling the extent of their affect, although they had very litdy effect on [ABA]x itself.
关键词
根
脱落酸
水分传输
气孔调节
数学模拟
Simulation, Vapour pressure deficiency, Air temperature, Soil water content, ABA, Stomatal conductance
