不同种植密度对冀张薯8号光合特性的影响

Effects of Different Planting Density on Photosynthetic Characteristics of Potato Variety Jizhangshu No.8

以冀张薯8号为材料,采用相同行距、不同株距种植马铃薯,研究密度对马铃薯光合特性及产量的影响.结果表明,不同密度（m1～m4）下马铃薯叶片的净光合速率上升,在盛花期达峰值,分别为23.0、24.3、22.1和21.8 μmol CO2/（m^2·s）,至终花期有所下降,至成熟期光合速率达最低值,分别为10.9、12.3、8.5和8.0 μmol CO2/（m^2·s）;蒸腾速率变化趋势与净光合速率基本相同,在盛花期达峰值,分别为7.2、7.9、6.5和6.0 mmolH2O/（m^2·s）,至成熟期达最低值,分别为0.9、1.5、0.8和0.8 mmolH2O/（m^2·s）;气孔导度在盛花期达峰值,分别为492.0、508.0、411.0和405.0 mmol/（m^2·s）,成熟期达最低值,分别为184.0、224.0、128.0和127.0 mmol/（m^2·s）;胞间CO2浓度与叶片净光合速率的变化相反,在盛花期达最低值,分别为112.0、105.0、118.0和126.0 μmol/mol;在整个生育期的m^2处理下净光合速率、蒸腾速率、气孔导度均高于其他处理,胞间CO2浓度最低;从产量上来看,m^2处理的产量最高.

Jizhangshu No.8 was used to study the growth,photosynthetic parameters and yield in different planting densities.The results showed that the leaf net photosynthetic rate,transpiration rate and stomatal conductance quickly increased in four treatments （m1,m^2,m3,m4）,which reached the peak values of 23.0,24.3,22.1 and 21.8 μmolCO2/（m^2·s）,7.2,7.9,6.5 and 6.0 mmol H2O /（m^2·s）,492.0,508.0,411.0 and 405.0 mmol/（m^2·s） at the flowering period and decreased in final flowering period reaching the minimum value in mature period with 10.9,12.3,8.5 and 8.0 μmolCO2/（m^2·s）,0.9,1.5,0.8 and 0.8 mmol H2O/（m^2·s）,184.0,224.0,128.0 and 127.0 mmol/（m^2·s）.The change of intercellular CO2 concentration was opposite comparing with photosynthetic rate and the minimum values were 112.0,105.0,118.0 and 126.0 μmol/mol,respectively.During the whole growth period,the photosynthetic rate,transpiration rate,stomatal conductance and yield of m^2 treatment were higher than that of other treatments.