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塔克拉玛干沙漠南缘3种荒漠植物光合特性的比较

, PP. 171-176

Keywords: 光合特性,叶绿素含量,叶氮含量,固氮与非固氮植物,塔克拉玛干沙漠

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Abstract:

在2008年6、7和8月中旬,以塔克拉玛干沙漠南缘固氮植物骆驼刺([WTBX]Alhagisparsifolia[WTBZ]Shap.)和非固氮植物柽柳([WTBX]Tamarixramosissima[WTBZ]Ledeb.)、花花柴([WTBX]Kareliniacaspica[WTBZ]Less.)为研究对象,研究了两种类型植物的净光合速率、光响应、CO2响应模型参数、叶绿素和叶氮含量等。结果表明:固氮与非固氮植物净光合速率日变化趋势,6月和7月均为双峰曲线,8月为单峰曲线;3个月光合速率平均值花花柴>柽柳>骆驼刺,即非固氮植物具有更高的净光合速率。最大净光合速率([WTBX]P[WTBZ]max)、表观量子效率(AQY)、CO2饱和点(CSP)和暗呼吸速率([WTBX]R[WTBZ]day),非固氮植物>固氮植物,且差异达到显著([WTBX]P[WTBZ]<0.05);羧化效率([WTBX]V[WTBZ]cmax)和电子传递速率([WTBX]J[WTBZ]max),柽柳和骆驼刺差异不显著([WTBX]P[WTBZ]>0.05);光饱和点(LSP)和补偿点(LCP)、CO2补偿点(CCP),固氮植物>非固氮植物,且差异达到显著([WTBX]P[WTBZ]<0.05);叶绿素和叶氮含量,固氮植物>非固氮植物,且差异均达显著水平([WTBX]P[WTBZ]<0.05)。通过双因素相关性分析,骆驼刺的[WTBX]P[WTBZ]max与Chl、叶氮含量之间无显著的相关性,柽柳和花花柴的[WTBX]P[WTBZ]max与Chl之间也无显著的相关性,柽柳的[WTBX]P[WTBZ]max与叶氮含量呈一定的负相关,而花花柴的[WTBX]P[WTBZ]max与叶氮含量呈一定的正相关。尽管固氮植物叶氮含量较高,但光合速率表现为非固氮植物高于固氮植物,这说明叶片中高的叶氮含量并不一定引起高的光合速率。

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