植物生态化学计量内稳性特征

化学计量内稳性是生态化学计量学研究的核心概念之一,是指生物在面对外界变化的时候保持自身化学组成相对稳定的能力,其反映了生物对周围环境变化作出的生理和生化响应与适应。通过研究植物生态化学计量内稳性,有助于深入了解植物对环境的适应策略和生态适应性,以及植物化学计量内稳性与生态系统功能的关系,但目前关于植物生态化学计量内稳性的研究较少。已有的研究结果表明:不同物种或功能群由于其生长策略不同而具有不同的生态化学计量内稳性特征;同一物种的不同器官、不同生长阶段以及不同元素的内稳性存在较大的差异。该文对植物生态化学计量内稳性概念、内稳性指数的测算方法,不同植物物种或功能群、不同器官、不同生长阶段内稳性特征,以及植物内稳性与生态系统结构、功能和稳定性的关系等方面进行了综述,并结合现已开展的工作,对有待进一步拓展的相关植物生态化学计量内稳性研究领域进行了展望,以期为促进国内相关研究工作的开展提供参考。

Characteristics of plant ecological stoichiometry homeostasis

Stoichiometric homeostasis is one of the core concepts of ecological stoichiometry. It refers to the ability of an organism to maintain a given elemental composition in the body despite variation in the elemental composition of its environment or diet. It reflects the net outcome of many underlying physiological and biochemical adjustments as organisms respond to their surroundings. Studies of stoichiometric homeostasis of plant will help us to understand the adaptation strategies and ecological adaptabilites of plants to the environment, as well as the relationships between plant ecological stoichiometry homeostasis and ecosystem functions. However, there are few studies on the internal stability of plant ecological stoichiometry. Previous research showed that the stoichiometric homeostasis characteristics of different plant species or functional groups were different. There were differences in stoichiometric homeostasis among different growth stages, different organs of the same species, as well as different nutrient elements. This paper reviews the concept of stoichiometric homeostasis, the estimation of plant homeostatic index, the stoichiometric homeostasis characteristics of different plant species or functional groups, different organs and growth stages and different elements, as well as linking plant stoichiometric homoeostasis with ecosystem structure, functioning and stability. Based on the obtained achievements and the current study, we put forward some perspectives of plant stoichiometric homoeostasis for future researches to be conducted with an aim to promote this discipline of research in China.