3个观赏竹在长沙地区引种适应性研究

为研究金明佛肚竹、黄条金刚竹和白纹椎谷笹在长沙地区的适应性，对引种的1年生幼竹进行了为期1年的光合日变化测定。结果表明：3个观赏竹的净光合速率值在不同月份之间差异极显著(P<0.01)，7月份的日变化曲线为双峰型，净光合速率值最高，是生长重要时期，其余月份的日变化曲线为单峰型，1月份最低，生长受到抑制，金明佛肚竹的情况较好；相关性分析得净光合速率受气孔导度、胞间CO2浓度、蒸腾速率，光合有效辐射、空气CO2浓度、空气温度和大气相对湿度影响，多元回归分析得出不同月份影响各竹种的净光合速率的主要因子。因此，在长沙及环境相似地区进行引种推广时优先考虑金明佛肚竹，当3个观赏竹在不同月份生长受到胁迫时可对其进行科学抚育。

3 Ornamental Bamboos Introduced in Changsha: Adaptability Research

This paper aims to study the introduction adaptability of three ornamental bamboos (B. ventricosa f. kimmei 、Pleioblastus kongosanensis.fau-reostriatus and Sasaella glabra(Nakai)Nakai ex Koidz.) in changsha area. the diurnal variation of photosynthesis were measured in different months for one year . The results showed that: The light value of net photosynthetic rate of three ornamental bamboos was significantly different from month to month(P<0.01). In July, the diurnal change of net photosynthetic rate in Pn value of 3 ornamental bamboo species was double-peak type and the light value of net photosynthetic rate was the highest. July is an important period for the growth of three ornamental bamboos.The diurnal change of net photosynthetic rate ( Pn) of 3 ornamental bamboo ware a one-peak curve in the other three months and the light value of net photosynthetic rate was the lowest in January . the photosynthesis of 3 ornamental bamboo in in January was inhibited.The growth status of the B.ventricosa f.kimmei is better than that of the other two ornamental bamboos.According to correlation analysis,the net photosynthetic rate was affected by stomatal conductance, intercellular CO2 concentration, transpiration rate, photosynthetic effective radiation, air CO2 concentration, air temperature and atmospheric relative humidity. The main factors influencing net photosynthetic rate of different bamboo species in different months were obtained by multiple regression analysis. According to the results of the experiment: In changsha or similar environment areas,prefential introduction opportunities shouid be given to B.ventricosa f.kimmei. Once the growth of three ornamental bamboos was stressed in different months, they were raised scientifically.