›› 2019, Vol. 31 ›› Issue (10): 1647-1654.DOI: 10.3969/j.issn.1004-1524.2019.10.10

• Horticultural Science • Previous Articles     Next Articles

Comparative study on photosynthetic characteristics and yield of different switchgrass varieties in saline-alkali land of northwest China

CHANG Wenwen1, LIU Jili1,2,*, WU Na3, ZHANG Yongqian3, HE Haifeng3   

  1. 1. College of Resources and Environmental Science, Ningxia University, Yinchuan 750021, China;
    2. Ningxia Key Laboratory of Resource Assessment and Environment Regulation in Arid Region, Yinchuan 750021, China;
    3. College of Agronomy, Ningxia University, Yinchuan 750021, China
  • Received:2019-05-05 Online:2019-10-25 Published:2019-10-30

Abstract: To screen switchgrass varieties with strong photosynthetic performance and high yield, eleven varieties of energy crop-switchgrass were used as materials in Yinbei saline-alkali region of Ningxia, using grey correlation analysis method to study yield and five photosynthetic indexes which were transpiration rate, stomatal conductance, net photosynthetic rate, intercellular CO2 concentration, water use efficiency. The results showed that there were significant differences in photosynthetic characteristics and yield among different switchgrass varieties at flowering stage under saline-alkali soil conditions. The general performance were Cave-in-Rock>Alamo>Kanlow>Forestberg>Ansai>Pathfinder>Nebraska 28>Japan>Trailblazer>NewYork>Black Well. Among them, Cave-in-Rock had high yield and the highest weighted correlation degree with ideal varieties, comprehensive performance was also the best. The weighted correlation degrees of Alamo and Kanlow were 0.711 and 0.654, and their biomass yield were 20.47 and 17.93 t·hm-2, respectively. Comprehensive evaluation showed that Cave-in-Rock, Alamo and Kanlow had better potential yield than the others in saline-alkali region. Black Well, NewYork, Trailblazer, Japan and Nebraska 28 had lower yield of biomass and photosynthetic characteristics, while the comprehensive performance of other varieties were medium level.

Key words: Panicum virgatum, photosynthetic characteristics, yield, grey correlation analysis

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