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在干旱半干旱风沙区,风沙流活动强烈是其主要环境特征之一,风沙流对植物的影响很大,是棉花栽培及生长发育的重要制约因素。该研究通过设置不受风沙影响的棉花和受风沙影响的棉花2组处理3个重复,测定棉花不同生育期的光合参数,探讨风沙对棉花光合特性的影响,结果表明:在苗期和蕾期风沙对棉花光合参数的影响非常明显,而在棉花花铃期的差异不显著,因此棉花受风沙影响的阶段主要在苗期和蕾期,而在花铃期影响不大;受风沙影响的棉花叶片会在风沙的作用下受到伤害,并在叶片上留下伤痕,新伤棉花功能叶片的净光合速率(Pn)、气孔导度(Cs)、胞间CO2浓度(Ci)和蒸腾速率(Tr)要明显低于旧伤和未受伤的棉花;风沙过后的降尘会对棉花叶片的光合作用参数有很大的影响;单位叶面积降尘量与叶片净光合速率(Pn)、气孔导度(Cs)、胞间CO2浓度(Ci)和蒸腾速率(Tr)都表现为显著负相关。
In the arid and semi-arid sandy sand area, strong wind-blown sand activity is one of the main environmental characteristics and wind-blown sand has a great impact on plants, which is an important restrictive factor for cotton cultivation and growth. In this study, three replicates were set up by setting up two replicates of cotton without wind-blown sand and cotton with wind-blown sand. The photosynthetic parameters of cotton at different growth stages were measured to study the effects of wind-blown sand on photosynthetic characteristics of cotton. The results showed that: The effect of aeolian sand on the photosynthetic parameters of cotton is very obvious, but there is no significant difference in the flower-boll stage of cotton, so the stage affected by wind-blown cotton is mainly in the seedling stage and the bud stage but not in the flower-boll stage; The leaves were harmed by sandstorm and leaves scars on the leaves. The net photosynthetic rate (Pn), stomatal conductance (Cs), intercellular CO2 concentration (Ci) and transpiration rate (Tr) ) Was significantly lower than that of old and uninjured cottons; dustfall after wind-blown sand had a significant effect on the photosynthesis parameters of cotton leaves; the amount of dustfall per leaf area was positively correlated with net photosynthetic rate (Pn) and stomatal conductance ), Intercellular CO2 concentration (Ci) and transpiration rate (Tr) all showed a significant negative correlation.