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通过对不同光照和水分条件下金矮生苹果 (Maluspumilacv .Goldspur)的蒸腾速率研究表明 ,金矮生苹果蒸腾速率 (Tr)与光照强度 (PAR)和土壤含水率 (SWC)的相关性非常显著 .Tr随着PAR和SWC的改善而增大 .但是 ,当光照和水分任何一种环境胁迫存在时 ,另一条件的改善不会使Tr有较大程度的上升 ,只有当SWC >11%或PAR >4 0 0mol·s-1·m-2 时 ,Tr才能随PAR或SWC的增大有较大幅度的上升 ;但当SWC >15 %或PAR >10 0 0mol·s-1·m-2 后 ,Tr不会随PAR或SWC有较大的变化 .PAR和SWC影响到气孔阻力 (RS)、叶水势 (Ψl)的大小是Tr作出响应的根本原因 .光胁迫降低气孔开启度 ,严重光胁迫时 (PAR <10 0mol·s-1·m-2 ) ,气孔阻力较大 (RS >2 0s·cm-1) ,导致Tr较低 (Tr <5μgH2 O·s-1·cm-2 ) .在严重水分胁迫时 ,导致Tr小于 11μgH2 O·s-1·cm-2 ;当土壤水分充足时 ,Tr将大于 15 μgH2 O·s-1·cm-2 ,基本接近最大值 .11%～ 15 %SWC所对应的RS范围是Tr变化曲线从一种变化趋势向另一变化趋势过渡的“转折区” ,是实行土壤水分控制可考虑的范围 .
The transpiration rate of gold dwarf apple (Malus pumilacv. Goldspur) under different light and moisture conditions showed that the correlation between transpiration rate (Tr) and light intensity (PAR) and soil moisture content (SWC) .Tr increased with the improvement of PAR and SWC. However, the improvement of the other conditions did not lead to a great increase of Tr when there was any environmental stress of light and moisture. Only when SWC> 11% or When PAR> 4 0 0mol · s-1 · m-2, Tr can increase with the increase of PAR or SWC, but when SWC> 15% or PAR> 10 0mol · s-1 · m- 2, Tr did not change significantly with PAR or SWC.PAR and SWC affected the stomatal resistance (RS) and the root water potential (Ψl) was the root of Tr response.Under light stress, Under light stress (PAR <10 0mol · s-1 · m-2), the stomatal resistance was higher (RS> 20s · cm-1), resulting in lower Tr (Tr <5μgH2O · s-1 · cm- ) Under severe water stress resulted in Tr less than 11 μgH 2 O · s-1 · cm-2, and when soil moisture was adequate, Tr would be greater than 15 μgH 2 O · s-1 · cm- ~ 15% SWC corresponds to the RS range is T. The “turning point” where the change curve of a curve changes from one trend to another is the range that soil moisture control can be considered.