华南地区3种入侵植物与本地植物叶片建成成本的比较  

Comparison of leaf construction costs between three invasive species and three native species in South China

作　　者：宋莉英[1,2] 彭长连[1] 彭少麟[2] 

机构地区：[1]华南师范大学生命科学学院,广东省高等学校生态与环境科学重点实验室,广州510631 [2]中山大学有害生物控制与资源利用国家重点实验室,广州510275

出　　处：《生物多样性》2009年第4期378-384,共7页Biodiversity Science

基　　金：教育部重大资助项目(704037);广东省自然科学基金(8451063101000535);中国博士后科学基金(20080440766)

摘　　要：生物量建成成本作为衡量植物生物量建成所需能量的指标,反映了植物的能量利用策略,较低的建成成本可能会增加入侵种的竞争优势。本研究以华南地区3种危害严重的入侵植物薇甘菊(Mikania micrantha)、三裂叶蟛蜞菊(Wedelia trilobata)和五爪金龙(Ipomoea cairica)为研究对象,选取与它们伴生或近缘的本地植物鸡矢藤(Paederia scandens)、蟛蜞菊(W.chinensis)和厚藤(I.pescaprae)作为对照,比较了相同环境下培养的入侵植物和本地植物叶片建成成本的差异。结果表明,这3种入侵植物的叶片单位质量建成成本(CCmass)和单位面积建成成本(CCarea)均低于它们的本地对照种。将3种入侵植物作为一组,它们的叶片平均CCmass(1.17g glucose/g)和CCarea(22.34g glucose/m2)显著低于本地种的叶片平均CCmass(1.32gglucose/g)和CCarea(36.93g glucose/m2)。本研究结果进一步证实,入侵植物与本地植物相比具有较低的叶片建成成本,这可能是它们入侵成功的原因之一。同时,本研究通过分析叶片建成成本与叶片碳浓度、氮浓度、灰分含量(Ash)以及去灰分热值(Hc)的相互关系,探讨了影响入侵种和本地种叶片建成成本的可能因素。结果显示,入侵植物具有较低的叶片建成成本是与其较低的碳浓度和氮浓度以及较高的灰分含量相联系的。Construction cost is a quantifiable measure of energy demand for biomass production, and reflects specific growth strategies. Low construction cost is hypothesized to give plant invaders a growth advantage through efficient energy utilization. In this study, three invasive alien species （Mikania micrantha, Wedelia trilobata and lpomoea cairica） and their co-occurring or phylogenetically related native species （Paederia scandens, Wedelia chinensis and Ipomoea pescaprae） in South China were used as materials for comparing leaf construction costs. These three invasive species exhibited lower mass- （CCmass） and area- （CCarea） based leaf construction costs than the corresponding native species had. Taking the three invasive species as a group, the mean leaf CCmass and CCarea of invasive species were 1.17 g glucose/g and 22.34 g glucose/m2, respectively, which were significantly lower than those for the native species （CCmass = 1.32 g glucose/g and CCmrea= 36.93 g glucose/m2）. The results testified the lower construction costs for invasive species compared with native ones, which might be a potential mechanism for the successful invasion of plants. Further, statistical analysis revealed significant correlations between leaf construction cost and leaf carbon content, nitrogen content and ash content （Ash） in invasive species. It suggested that the lower leaf construction costs of invasive species were partly due to their lower carbon and nitrogen content, and higher Ash relative to their corresponding native species.

关 键 词：灰分含量 去灰分热值 生物量建成成本 碳浓度 入侵植物 

分 类 号：Q948[生物学—植物学]