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不同种植方式下柽柳光合生理参数光响应特性研究

, PP. 753-762

Keywords: 多枝柽柳,种植方式,光合特性,生理指标,光响应

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Abstract:

为选择合适的间套模式,在塔干沙漠南缘绿洲外围利用Li-6400光合作用仪对四种种植模式(行间混交、带状混交、块状混交、块状套作)下多年生多枝柽柳(Tamarixramasissimaledeb.)的光合水分生理指标对有效光辐射(PAR)的响应进行测定。结果表明:(1)柽柳具有高光饱和点(679~822μmol·m-2·s-1)和高光补偿点(50.0~61.1μmol·m-2·s-1)。(2)不同的光照强度和种植方式对柽柳净光合速率有明显的影响(p1500μmol·m-2·s-1后,块状套作和块状混交气孔导度(Gs)下降,行间混交和带状混交Gs则随光强增加而递增;带状混交下胞间CO2浓度(Ci)和蒸腾速率(Tr)均随光强增加而递增,其他3种种植方式下Ci和Tr均呈递减或平稳趋势。(4)4种种植方式下柽柳光响应曲线的特征参数存在着差异(P块状混交>行间混交>块状套作。通过4种种植方式柽柳光响应特征的综合分析可知,带状混交下的柽柳具有高光合和高水分利用效率的特点,对于极端干旱的塔南地区而言,该种植方式下的柽柳生理特征表现出最好的适应性。

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