Photosynthetic characteristics of Leymus chinensis and Medicago sativa in artificial grassland

doi:10.13287/j.1001-9332.202310.009

Abstract

Abstract: To explore the effect of monoculture and mixture sowing artificial grassland on the photosynthetic characteristics of Leymus chinensis and Medicago sativa, we determined the diurnal variation of photosynthetic properties of L. chinensis and M. sativa under different treatments. The results showed that the diurnal changes of net photosynthetic rate, blade temperature and transpiration rate of L. chinensis and M. sativa showed ‘unimodal type’ in monoculture, the stomatal conductance of M. sativa showed ‘unimodal type’, and the stomatal conductance and water use efficiency of L. chinensis showed ‘bimodal type’. Under the mixed sowing treatment, the diurnal changes of net photosynthetic rate, blade temperature and transpiration rate of L. chinensis and M. sativa showed ‘unimodal type’, the stomatal conductance and water use efficiency of L. chinensis showed ‘unimodal type’, and the stomatal conductance of M. sativa showed ‘bimodal type’. The peak photosynthetic rate of L. chinensis under mixture was signi-ficantly higher than that under monoculture, being 17.72 and 13.65 μmol CO₂·m^-2·s^-1, respectively. Under monoculture and mixture sowing treatments, the chlorophyll content of L. chinensis was higher than that of M. sativa, nitrogen content of the leaves of L. chinensis was lower than that of M. sativa, and the nitrogen content in the leaves of mixture sowing L. chinensis was significantly higher than that of monoculture sowing L. chinensis, which were 27.60 and 22.55 g·kg^-1, respectively. Net photosynthetic rates of L. chinensis and M. sativa were significantly positively correlated with stomatal conductance and transpiration rate, and significantly negatively correlated with intercellular CO₂ concentration under different planting methods. Net photosynthetic rate of M. sativa was significantly positively correlated with blade temperature and water use efficiency. In summary, mixed sowing was beneficial to enhance nitrogen content of L. chinensis. Our results provided a theoretical basis for the response of the photosynthetic characteristics of forage to planting mode of artificial grassland.

Key words: Leymus chinensis, Medicago sativa, photosynthesis, chlorophyll

SHI Yiping, SONG Yantao, Namuhan, PENG Qingtian, LYU Linyou, SHEN Yue, Qian Na, Wu Yunna. Photosynthetic characteristics of Leymus chinensis and Medicago sativa in artificial grassland[J]. Chinese Journal of Applied Ecology, 2023, 34(10): 2655-2662.

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