不同施氮水平下甜菜光合特性比较  

The photosynthetic characters of sugar beet under different nitrogen levels

作　　者：刘莹[1] 史树德[1] 

机构地区：[1]内蒙古农业大学农学院,内蒙古呼和浩特010018

出　　处：《北方农业学报》2016年第2期7-12,共6页Journal of Northern Agriculture

摘　　要：以KWS9167甜菜品种为材料,采用LCpro-SD,在5个施氮水平下（0,50,100,150,200 kg/hm2）分别测定光合特性,比较不同施氮水平下甜菜光合特性和产品质量形成的关系。结果表明：不同施氮水平下,甜菜在各时期叶绿素含量、SPAD值、光合速率、蒸腾速率、气孔导度、胞间CO2浓度等光合特性指标均表现为单峰曲线的变化趋势。在叶丛生长后期至块根膨大前期（6月20日至7月11日）,此期间各项指标均处于较高水平,表明此期间甜菜生长处于旺盛阶段。在0~150 kg/hm2施氮水平下,叶绿素、SPAD值和光合速率随施氮量的增加而增加,过量施氮则增长效果不明显。在甜菜生育期内,叶绿素含量和SPAD值与块根产量和含糖量为显著正相关（P〈0.05）,光合速率与产量为显著正相关（P〈0.05）。The sugar beet cultivars KWS9167 was used as materials using the LCpro-SD in this study.The effects of different nitrogen levels（0,50,100,150 and 200 kg/hm2）were studied on dynamic changes of photosynthetic characteristic, in order that comparing the beet photosynthetic characteristics under different nitrogen levels and the relationship between the yield and quality. The results showed that： chlorophyll content, photosynthetic rate（Pn）, transpiration rate（Tr） and stomata conductance（Gs） were all expressed in single peak curve. From the foliage rapid growth stage to root enlargement growth stage（June 20 to July 11）, during the period the indicators were at a higher level, which indicated that the sugar beet growth at the vigorous stage. In the range of 0 ~150 kg/hm2, chlorophyll content, SPAD and photosynthetic rate increased with the increase of nitrogen application and excess nitrogen level growth effect was not obvious. The correlation between the chlorophyll content, SPAD and sugar beet yield were significantly positive. The correlation between photosynthetic rate and yield was significantly positive.

关 键 词：甜菜 施氮量 光合特性 叶绿素含量 SPAD值 蒸腾速率 

分 类 号：S566.3[农业科学—作物学]