摘要
2013年7月对云南省昆明(海拔2100 m)和者竜(海拔985 m)2个不同海拔地区人工荫棚种植下滇重楼叶片和花萼的光合特性进行了比较研究。结果表明:不同海拔下滇重楼叶片与花萼净光合速率(Pn)日变化曲线均呈不明显的"双峰"曲线,光合午休出现在14:00左右,叶片与花萼Pn最高峰值分别出现在10:00和12:00,空气温度(Ta)偏高和相对湿度(RH)偏低分别是导致者竜和昆明地区滇重楼"午降"的主要因素;昆明地区滇重楼叶片和花萼日均Pn、Pnmax、LSP和初始量子效率较高,LCP、Rd较低,光合能力更高;昆明地区滇重楼花萼具有同叶片相似的光合特性,对光强的适应范围较大;但者竜地区滇重楼花萼Pnmax和LSP显著低于叶片,初始量子效率显著高于叶片(P<0.05),对光强的适应范围较小,对弱光的利用能力更高;去除花萼后,滇重楼果实干重显著降低,且者竜地区果实干重减少量显著低于昆明地区(P<0.05)。
Photosynthetic characteristics of leaf and calyx of Pairs polyphylla var. yunnanensis in Kunming （2100 m a.s.1. ） and Zelong （985 m a.s.1. ） of Yunnan Province, Southwest China were investigated in July, 2013, The results showed that the diurnal variations of the net photosynthetic rates （Pn） of leaf and calyx at the two sites exhibited a double-peak curve with a midday depres- sion of photosynthesis at 14：00. The maximum Pn values of leaf and calyx were observed at 10：00 and 12：00, respectively. The relatively high temperature and low relative humidity attributed to the midday depression of photosynthesis of P. polyphyUa var. yunnanensis in Kunming and Zelong, respectively. The daily average Pn, maximum Pn, light saturation point and initial quan- tum yield of either leaf or calyx in Kunming were higher than in Zelong, whereas the lower light compensation point and dark respiratory rates of leaf and calyx were found in Kunming, which implied a higher photosynthetic capacity of Pairs polyphylla var. yunnanensis in Kunming. The photosynthetic characteristics of calyx and leaf were similar in Kunming, which showed a wide adaptability of P. polyphylla var. yunnanensis to light. The maximum Pn and light saturation point of calyx were significantly lower （P〈0.05） than those of leaf in Zelong, while the significantly higher initial quantum yield was observed for calyx, which revealed a narrow adaptability to light and a high utilization efficiency to weak light for calyx of P. polyphylla var. Yunnanensis at the low altitude site. Calyx removal resulted in the decrease of fruit dry mass, and the extent of de- crease in Zhelong was significantly smaller than that in Kunming.
出处
《生态学杂志》
CAS
CSCD
北大核心
2015年第1期70-78,共9页
Chinese Journal of Ecology
基金
国家林业公益性行业科研专项(201304202)资助
关键词
滇重楼
海拔
光合特性
花萼
环境因子
Pairs polyphylla var. yunnanensis
altitude
photosynthetic characteristics
calyx
environmental factor.
