作　　者： ; ; ; (林晨菲）;

机构地区： 广东海洋大学农学院

出　　处： 《热带农业科学》 2014年第12期30-34,共5页

摘　　要： 采用Li-6400便携式光合仪对广州市区18种常见园林绿化灌木树种的净光合速率日变化进行测定,估测其日净固碳释氧量;以日净固碳量为指标,运用离差平方和对不同灌木树种的固碳释氧能力进行聚类分析。结果表明：不同树种的光合特性有差异,光合速率日变化曲线呈单峰型和双峰型2种类型。大多数植物净光合速率的日最高值出现在上午10：00～12：00,少数植物出现在下午14：00～16：00。不同树种固碳释氧能力也有所差异,其中固碳释氧能力最强的4种灌木分别为马缨丹、假连翘、黄叶榕和红桑,最弱的为棕竹。依据日净固碳量将灌木树种聚为3类,日净固碳量高的如马缨丹、假连翘、黄叶榕、红桑[固碳量为7～10 g/（m^2·d）,释氧量为5～7 g/（m^2·d）],日净固碳量中等的如叶子花、朱槿、九里香、米仔兰、鹅掌藤、含笑花、狗牙花[（固碳量为5～7 g/（m^2·d）,释氧量为3～5 g/（m^2·d）],日净固碳量低的如朱蕉、变叶木、红背桂花、茉莉花、江边针葵、基及树、棕竹[（固碳量为2～5 g/（m^2·d）,释氧量为1～3 g/（m^2·d）]。本研究将为碳汇林业指导下的园林绿化树种选择提供一定的参考价值。 The net photosynthetic rate of 18 shrub species in Guangzhou city were measured by using the Li-6400 portable photosynthetic system in order to evaluate their daily net carbon fixation and oxygen release of each species. The cluster analysis was also used to compare their net amount of carbon storage and oxygen release capacity of different shrub species. The results showed that the photosynthetic characteristics of shrub species are different, and the single-peak and double-peak curve of diurnal change of photosynthetic rate variation were observed. The peak values of photosynthetic rate for most plant appeared between 10： 00 and 12： 00. Only a few of plant＇s photosynthetic rate peak appeared between14： 00 and 16： 00 in the afternoon. The capacity of carbon fixation and oxygen release among the shrub species are also different. The four high carbon fixation and oxygen release species are Lantana camara L.,Duranta repens L., Ficusmicrocarpa cv. Golden Leaves and Acalypha wilkesiana Muell.-Arg., and the weakest plant was Rhapis excelsa Thunb. Based on the net amount of carbon storage, the shrub trees were divided trees into three categories by using the cluster analysis. The high daily carbon storage and oxygen release group including Lantana camara L., Duranta repens L., Ficusmicrocarpa cv. Golden Leaves and Acalypha wilkesiana Muell.-Arg. [7～10 g/（m^2·d） and 5～7 g/（m^2·d）], medium daily carbon storage and oxygen release group including Bougainvillea spectabilis Willd., Hibiscus rosa-sinensis L., Murraya exotica L., Aglaia odorata Lour., Schefflera arboricola H., Michelia figo（Lour.） Spreng., Ervatamia divaricata（L.） Burk. cv. Gouyahua, the low daily carbon storage and oxygen release group Cordyline fruticosa（L.） A. Cheval., Codiaeum variegatum（L.） A. Juss., Excoecaria cochinchinensis Lour., Jasminum sambac（L.） Ait., Phoenix roebelenii O. Brien, Carmona microphylla（Lam.）G. Don and Rhapis excelsa（Thunb.） Henry ex Rehd. The study will provide the certain reference

关 键 词： 绿化树种 净光合速率 固碳释氧量 聚类分析

领　　域： [农业科学] [农业科学]