异质环境下游击型克隆植物的内稳性特征及其机制

In the process of long-term adaptation to the natural evoluton, ability of entering heterogeneous environment and strategies such as clonal integration, clonal plastisity and intraclonal division of labour are shaped under heterogeneous environments for guerilla clonal plants. Currently, how power and weak of homeostasis and what physiological and ecological mechanism of guerilla clonal plants is still relatively lacking under heterogeneous environments. The study take guerilla clona plant Chimonobambusa hejiangensis as its object. Changes of light intensity and soil nurient are used to simulate heterogeneous enviroments, and homeostasis features of Chimonobambusa hejiangensis are analysised by using ecological stoichiometry and physiological and biochemical parameter under heterogeneous light intensity and soil nurient. Coupling relationship between homeostasis index and ecological stoichiometry and physiological and biochemical parameter of Chimonobambusa hejiangensis are evaluated searching for homeostasis mechanism and relatively stable stoichiometry relationship between S and C, N, P elements in heterogeneous light intensity and soil nurient conditions.The results of this research not only enrich the theoretical system of clonal plants study but also offer theoretical support for meet and reasonable utilization for clonal plants.

游击型克隆植物在长期进化的过程中形成了易于进入异质环境能力，并在异质资源生境中表现出特殊的应对方式：克隆生理整合、克隆表型可塑性和克隆内分工。然而，游击型克隆植物应对异质环境的方式不能体现生物体的内稳性强弱，维持内稳性的生理生态机制是什么，目前这方面的研究尚比较欠缺。本研究拟以游击型克隆植物合江方竹为研究对象，采用人为模拟异质光照和土壤养分的方法，运用生态化学计量学结合生理生化变化，分析异质光照和土壤养分下合江方竹基株和分株内稳性特征，探讨异质光照和土壤养分下合江方竹内稳性指数与生态化学计量关系和生理生化变化的耦合关系，还着重探讨合江方竹生物体内S元素与C、N、P元素是否存在相对稳定的计量关系，阐明合江方竹应对异质光照和土壤养分维持其生物体内部稳定的内在机制。研究结果不仅能丰富克隆植物研究的理论体系，也可为克隆植物的认识和合理利用提供理论支撑。

游击性克隆植物在适应异质生境中表现出克隆生理整合、克隆表型可塑性和克隆内分工等不同于非克隆植物的特性，本研究以生态化学计量学碳、氮、磷和硫元素探讨游击性克隆植物合江方竹应对异质光照和肥力下基株和分株的内稳性特征。研究表明：(1)异质光水平下，合江方竹无论是母株还是分株遮阴，二、三年生分株其内稳性保持相对稳定，源株与分株对光环境反应具有差异性；(2)氮、磷处理使克隆母株和分株均表现出富氮磷而内稳性相对稳定的特征；(3)硫处理显著增加克隆母株和分株根和叶的内稳性；(4)根叶干重比与叶碳硫比，氮硫比和磷硫比成正相关，与根根叶干重比与叶碳硫比，氮硫比和磷硫比成负相关。研究结果不仅能丰富克隆植物研究的理论体系，还为合江方竹林的管理和利用提供理论支撑。