摘要
了解年龄对树木胸径生长的影响,对于研究森林群落结构、功能及碳循环等具有重要意义。代谢生态学认为植物的胸径生长速率正比于其胸径的1/3次幂。然而,最近的研究对该理论提出了质疑。通过分析刨花楠解析木数据,结果表明,胸径生长速率与胸径成异速生长关系,但不同年龄具有不同胸径异速生长指数,不支持代谢生态学的推论。随着年龄增加,刨花楠胸径生长呈现先减小后增加模式,这可能是由于植物对光资源的利用造成的。
Understanding the effects of stand age on tree growth is central to forest ecology because of the significance of growth to forest structure, function and carbon flux. Metabolic theory of ecology predicts that stem-diameter growth scales as the 1/3 power of stem diameter. However, recent researches have challenged the generality of this theory, leading to a vigorous debate. In this paper, we examined data for tree stem-diameter growth of Machilus pauhoi to determine the effects of age on tree growth. Our results show that for the different stand age, M. pauhoi have different scaling exponents for tree stem-diameter growth, which significantly deviate from the one-third scaling law predicted by the metabolic theory of ecology. Furthermore, we argue that the dif- ferent scaling exponents for tree stem-diameter growth with tree growth are led by the influence of light competi- tion on the scaling of growth with size.
出处
《安徽农业大学学报》
CAS
CSCD
北大核心
2013年第1期28-31,共4页
Journal of Anhui Agricultural University
基金
国家自然科学基金项目(30901151
31170374
31170596)
国家农业科技成果转化资金项目(2011GB2C400005)
福建省高等学校新世纪优秀人才支持计划(JA12055)共同资助
关键词
刨花楠
胸径生长速率
异速生长
代谢生态学
Machilus pauhoi
stem-diameter growth
allometry
metabolic theory of ecology
