4种地被竹光合作用日变化及光合光响应曲线

Study on the photosynthetic dynamic variation of 4 dwarf bamboos

以4种地被竹[铺地竹(Arundinaria argenteostriata),菲白竹(Arundinaria fortunei),鹅毛竹(Shibataea chinensis),黄条金刚竹(Sasaella masamuneana f.aureostriata)]为材料,研究了其光合生理动态。结果表明,各竹种4、8月份光合日变化均为"双峰型"曲线,中间出现短暂的"午休"现象,但各竹种净光合速率(Pn)高峰值出现的时间不同,11月份为"单峰型"曲线,其中8月份各竹种的Pn要大于其余2个月份。用直角双曲线、非直角双曲线、二项式回归法对各竹种光合各参数进行拟合,二项式回归拟合各竹种的光饱和点(Lsp)较为准确,而用非直角双曲线拟合各竹种光合的其余参数较为准确。

Bamboo is one of the important forest resources in China and it can take ecological, economical and social benefits. The photosynthetic dynamic variation of 4 dwarf bamboos （Arundinaria argenteostriata, Arundinaria fortunei, Shibataea chinensis, Sasaella masamuneanaf, aureostriata） was researched. The results showed that the diurnal variation of net photosynthetic rate was bimodality in April and August, The chief reason for photosynthetic midday depression in these months was that the stoma partly shut. It was the different time that the highest net photosynthetic of the four dwarf bamboos appeared. However, it was a single peak curve in November and the net photosynthetic rate of the August was bigger than that of the April and November. The photosynthetic parameters were simulated by rectangle hyperbola, non-rectangle hyperbola and binomial regression. The light saturation point approached the actual value when fitted with binomial regression, and the other parameters were more precise while fitted with non-rec- tangle hyperbola.