首页|植物代谢速率与个体生物量关系研究进展

植物代谢速率与个体生物量关系研究进展

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植物的各项生理生态功能(例如,呼吸、生长和繁殖)都与个体生物量成异速生长关系.West,Brown 及 Enquist 基于分形网络结构理论所提出的WBE模型认为:植物的代谢(呼吸)速率正比于个体生物量的3/4次幂.然而,恒定的"3/4异速生长指数"与实测数据、植物生理生态学等研究之间存在矛盾,引发激烈的争论.分析了不同回归方法对代谢指数的影响,重点对植物代谢速率与个体生物量异速生长关系研究进展进行了综述,得出植物代谢指数在小个体时接近1.0,并随着生物量的增加而系统减小,且其密切依赖于氮含量的调控的结论.据此,提出了进一步研究植物代谢速率个体生物量关系需要解决的一些科学问题.
The advance of allometric studies on plant metabolic rates and biomass
It has been known that body size has a profound influence on almost all characteristics of plants. Scaling, which is the study of the influence of body size on form and function, provides a useful tool to understand morphological and physiological phenomena, such as respiration, growth and reproduction. Based on the fractal branching of vascular systems of typical plants, the West, Brown and Enquist theory ( denoted henceforth as the WBE theory) predicts that plant as well as animal respiration should scale as the 3/4 power of body size. Because plant respiration plays a crucial role in a wide range of ecological phenomena, ranging from the biomass accumulation of individual trees to global atmospheric CO2 concentrations, the WBE theory has stimulated a vigorous debate concerning its validity and predictive value over the past decade, and it has receive both supportive and opposing evidence. In this review, we first considerate the effects of different regression protocols on sealing exponents, focusing on ordinary least squares ( OLS ) and reduced major axis ( RMA )regression analysis. We then review the recent advances that have improved our understanding of the scaling of plant respiration with respect to biomass, and explicitly point out that the scaling exponent varies markedly depending on plant developmental stage and nitrogen content. Briefly, the initial confirmation of the WBE theory with respect to plants was mostly derived from indirect (surrogate) measurements of metabolic rates (e.g. diameter growth rates, biomass production rates, and leaf biomass). However, substantial deviations from the predictions of the WBE theory have been observed for particular taxonomic groups or ecosystems. Using the direct measurement of plant respiration, recent studies have suggested that the scaling exponent for plant respiration is close to unity for saplings but numerically decreases as trees grow. This numerical shift in the plant respiration exponent is thought to reflect physical and physiological constraints on the allocation of plant biomass between photosynthetic and nonphotosynthetic organs over the course of plant growth. Furthermore, plant metabolism is more closely related to nitrogen content rather than total biomass becanse nitrogen is largely confined to living tissues and is fundamental to physiological process such as respiration. Lastly, we discuss issues to be resolved in future research that promise to further deepen our understanding of plant metabolic scaling relationship.

plant metabolic ratesbiomassWBE theorynitrogen contentallometry

程栋梁、钟全林、林茂兹、金美芳、钱瑞芳

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福建师范大学湿润亚热带生态-地理过程省部共建教育部重点实验室,福州,350007

福建师范大学福清分校生化系,福清,350300

植物代谢速率 生物量 WBE理论 氮含量 异速生长

国家自然科学基金福建省重大专项目福建省自然科学基金福建省教育厅资助项目

309011512005NZ10102009J05056JA08039

2011

生态学报
中国生态学学会,中国科学院生态环境研究中心

生态学报

CSTPCDCSCDCHSSCD北大核心
影响因子:2.191
ISSN:1000-0933
年,卷(期):2011.31(8)
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