不同种植方式下柽柳光合生理参数光响应特性研究

摘要/Abstract

摘要： 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(Tamarix ramasissima ledeb.)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(p<0.01),当0< PAR< 1500μmol·m^-2·s^-1,除胞间CO₂浓度(Ci)外柽柳的各项生理指标均随光照的增强而增加。(3) PAR>1500μmol·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<0.05),带状混交下的光饱和速率、光饱和点、表观量子效率均最高,块状混交的暗呼吸速率最大,水分利用效率(WUE)随着光强的增强而逐步增大,依次表现为带状混交>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。

关键词: 多枝柽柳, 种植方式, 光合特性, 生理指标, 光响应

Abstract: In order to explore the adaptability of adventitious plants of extreme arid regions and chose suit cropping patterns of Tamarix ramasissima ledeb, the paper studied the photosynthesis characteristics of Tamarix ramasissima ledeb. by Li-6400 and soil water potential under four different cropping patterns(mixed by strips, mixed by row, mixed by group, the massive interplanting)in the same environment at the desert-oasis transitional area of the Cele oasis on the southern fringe of Taklimakan Desert in October 2010. The paper analysed and compared the physiology characteristics and water physiology of Tamarix ramasissima ledeb. under the four different cropping patterns, and the results show as follows:(1)Tamarix ramasissima ledeb. has high light saturation point(679-822 umol·m^-2·s^-1)and high light compensation point(50.0-61.1 umol·m^-2·s^-1).(2)The net photosynthetic rate(Pn)was affected by cropping patterns and illumination intensity, and the difference was great significantly(P<0.01). When the photosynthetic active radiation(PAR)reached between 0 and 1500 umol·m^-2·s^-1, all photosynthesis characteristics are increasing with the enhancement of light increases except the intercellular CO₂ concentration(Ci).(3)When the photosynthetic active radiation(PAR)reached higher than 1500 umol·m^-2·s^-1, the Gs of Tamarix ramasissima ledeb. under mixed by group and the massive interplanting patterns descended with the enhancement of light increases, while the Gs of Tamarix ramasissima ledeb. under mixed by strips and mixed by row patterns are opposite; the intercellular CO₂ concentration(Ci)and transpiration rate(Tr)under mixed by row pattern are all increase with the light enhanced, but under the other three patterns the two photosynthesis characteristics are all decrease or have no change;(4)the photosynthesis characteristics and physiology characteristics reflected significantly different of four cropping patterns(P<0.05), The maximum net assimilation rate(A_max), apparent quantum requirement(AQY), light saturation point(LSP)of Tamarix ramasissima ledeb. under line-mixed cropping patterns are all highest among four different patterns, and Tamarix ramasissima ledeb. under mixed by group pattern has biggest dark respiration rate. The water use efficiency(WUE)under four cropping patterns are all increasing as the he enhancement of light increases, and the order from high to low are:linemixed cropping patterns>group mixed cropping patterns>row mixed cropping patterns>the massive interplanting cropping patterns. According to comprehensive analysis of the photosynthesis characteristics of Tamarix ramasissima ledeb. under four cropping pattern, Tamarix ramasissima ledeb. under line-mixed cropping patterns had high Pn and high WUE, it showed the best adaptation to the southern marginal zone of the Taklimakan Desert where had sufficient sun light and extreme arid climate.

Key words: Tamarix ramasissima ledeb, cropping pattern, photosynthesis characteristics, physiology characteristics, light respons

中图分类号:

Q945.11

王会提, 曾凡江, 张波, 李尝君, 高欢欢, 鲁建荣. 不同种植方式下柽柳光合生理参数光响应特性研究[J]. 干旱区地理, 2015, 38(4): 753-762.

WANG Hui-ti, ZENG Fan-jiang, ZHANG Bo, LI Shang-jun, GAO Huan-huan, LU Jian-rong. Light response of Tamarix ramasissima ledeb. physiological parameters under different cropping patterns[J]. , 2015, 38(4): 753-762.

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