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利用便携式叶绿素荧光分析仪测定了库布齐沙地油蒿(Artemisia ordosica)、中间锦鸡儿(Caragana inter-media)、羊柴(Hedysarum laev)、沙柳(Salix cheilophila)、紫花苜蓿(Medicago sativa)和达乌里胡枝子(Lespe-deza davurica)的叶绿素荧光参数。结果表明,固定荧光(F0)、最大荧光(Fm)、PSⅡ的潜在活性(Fv/F0)、PSⅡ最大光学效率(Fv/Fm)、光化淬灭系数(qP)、非光化学淬灭系数(NPQ)、PSⅡ实际光化学效率(Yield)7项叶绿素荧光参数表现出不同程度的差异。在6种沙地植物中,中间锦鸡儿、羊柴、沙柳、油蒿4种灌木植物的Fm、Fv/F0、Fv/Fm、qP、Yield值均显著(P<0.05)高于草本状半灌木达乌里胡枝子和草本植物紫花苜蓿,这表明中间锦鸡儿、羊柴、沙柳、油蒿的光合能力大于达乌里胡枝子和紫花苜蓿。然而,达乌里胡枝子和紫花苜蓿的NPQ显著高于中间锦鸡儿、羊柴、油蒿、沙柳,说明紫花苜蓿和达乌里胡枝子的叶片通过热耗散的能量较多,这两种植物通过热耗散消耗掉过剩光能,从而避免了沙地强光环境对光合机构的破坏。
Artemisia ordosica, Caragana inter-media, Hedysarum laev, Salix cheilophila, Medicago sativa were determined using a portable chlorophyll fluorescence analyzer. And the chlorophyll fluorescence parameters of Lespe-deza davurica. The results showed that the maximum fluorescence efficiency (F0), maximum fluorescence (Fm), potential activity of PSⅡ (Fv / F0), maximum optical efficiency of PSⅡ (Fv / Fm), photochemical quenching coefficient (qP), non-photochemical quenching coefficient NPQ), and the actual photochemical efficiency of PS Ⅱ (Yield) Seven chlorophyll fluorescence parameters showed different degrees of difference. Fm, Fv / F0, Fv / Fm, qP, and Yield of four shrubs in Caragana korshinskii, Sheepwood, Salix psammophila and Artemisia ordosica were significantly higher than those in herbaceous Half shrubs Lespedeza davidiana and herbaceous alfalfa, which showed that the photosynthetic capacity of Caragana intermedia, Ramie Chardonnay, Salix psammophila and Artemisia ordosica were greater than that of dahurian rhizome and alfalfa. However, the NPQs of Lespedeza dahurica and alfalfa were significantly higher than those of Caragana korshinskii, A. chinensis, Artemisia ordosica and Salix psammophila, indicating that the leaves of alfalfa and dahurica had more energy dissipation through heat dissipation Plants dissipate excess light energy through heat dissipation, thus avoiding damage to the photosynthetic machinery by the glare of the sand.