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为探讨虉草对不同土壤水分条件的光合生理响应特性,通过温室盆栽控水试验,利用LI-6400便携式光合测定系统,测定了虉草在5个土壤水分梯度下的光合生理指标。结果显示:(1)淹水组、对照组与轻度干旱组之间净光合速率差异不显著;重度干旱组净光合速率最低,与其他各组差异均显著,导致其下降的原因是气孔因素与非气孔因素共同作用的结果,而其他各组的原因则仍为气孔因素。(2)09:00—09:30,与中度干旱组相比,重度干旱组胞间CO2浓度有所增加,气孔限制值与水分利用效率有所下降。(3)10:30—11:00之间,各组虉草均出现不同程度的光合午休现象,其中净光合速率、蒸腾速率、气孔导度、胞间CO2浓度均有所下降,而气孔限制值与水分利用效率却明显增加。说明为适应不同土壤水分环境,虉草在光合生理特性方面具备一定的适应调节机制。
In order to investigate the photosynthetic physiological response characteristics of Artemisia sphaerotheca under different soil water conditions, photosynthetic physiological indices of Artemisia splendens under five soil moisture gradients were determined by LI-6400 portable photosynthesis system through greenhouse water control experiment. The results showed that: (1) There was no significant difference in net photosynthetic rate between flooded group and control group and mild drought group; the net photosynthetic rate of severe drought group was the lowest, which was significantly different from other groups. The reason of its decrease was stomatal factor The result of the interaction with non-stomatal factors was still the stomatal factor for the other groups. (2) From 09: 00-09: 30, compared with the moderate drought group, the intercellular CO2 concentration in the severe drought group increased, and the stomatal limitation value and water use efficiency decreased. (3) During the period of 10: 30-11: 00, the photosynthetic midday depression appeared in all groups, and the net photosynthetic rate, transpiration rate, stomatal conductance and intercellular CO2 concentration all decreased while the stomatal limitation Values and water use efficiency have increased significantly. It shows that in order to adapt to different soil water environment, the lawn grass has some adaptive regulation mechanism in the photosynthetic physiological characteristics.