降尘对苹果叶片光合作用及营养特性的影响

Effect of Falling Dust on Photosynthetic and Nutrition Characteristic of Malus domestica Leaves

以塔里木盆地为研究区,利用多重比较方法分析降尘对苹果(Malus domestica Borkh.)叶片的光合作用及营养特性的影响。结果表明,降尘使苹果叶片的净光合速率(Pn)、蒸腾速率(Tr)、气孔导度(Gs)、胞间CO2浓度(Ci)均下降。受降尘影响后,元帅(M.domestica cv.Delicious)和富士(M.domestica cv.Fuji)苹果叶片中的氮素含量增加、钾素含量减少;而金冠(M.domestica cv.Goldcn Delicious)苹果叶片的氮素含量下降、钾素含量增加;不同品种的苹果叶片磷素含量受降尘影响后呈现不同的变化。

Multiple comparative analysis was conducted to study the effects of falling dust on photosynthetic and nutrition characteristic of Malus domestica Borkh. leaves in Tarim basin. The results indicated that net photosynthetic rate （Pn）, tran- spiration rate （Tr）, stomatal conductance （Gs） and intercellular CO2 concentration （Ci） of M. domestica leaves with falling dust was reduced. Nitrogen content was increased; and potassium content was decreased in leaves of M. domestica cv. Delicious and M. domestica cv. Fuji affected by falling dust. Nitrogen content was decreased while potassium content was in- creased in leaves of M. domestica cv. Golden Delicious affected by falling dust. Changes of phosphorus content differed in leaves of different varieties of M. domestica affected by falling dust.