Influences of biotic and abiotic factors on the relationship between tree productivity and biomass in China
Influences of biotic and abiotic factors on the relationship between tree productivity and biomass in China
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DOI：
10.1016/j.foreco.2011.10.012
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发表时间：
2012-01-15
影响因子：
3.7
通讯作者：
Ren, Hai
中科院分区：
文献类型：
--
作者：
Hui, Dafeng;Wang, Jun;Ren, Hai
树木生产力与生物量的关系不仅反映了植物的适应性和植物与环境的相互作用，而且对全球碳循环、气候变化和森林管理具有重要意义。然而，生物因素（如树龄、胸径、高度）和非生物因素（如海拔、纬度和经度）如何影响树木生产力和生物量之间的关系尚未得到很好的研究。我们分析了中国树木生产力和生物量的大型数据库，以得出这两个变量之间的关系。整个数据库按照树龄、胸径、高度、纬度、经度和海拔分成不同的组。利用线性回归模型和异速生长方程（即幂函数）对每组进行了生产率和生物量之间的关系分析。基于生物或非生物因子分组的模型参数的差异表明每种因子对生产力与生物量关系的影响。线性回归模型的斜率随树龄、胸径、高度和海拔而减小，随树密度和经度而增大。幂函数的标度指数随树龄、树高和密度呈二次型变化，随海拔呈线性下降。结果表明，中国树木生产力与生物量之间存在显著的相关关系，但这种关系受一些生物因子和非生物因子的影响而有所不同。为了更好地从生物量中预测树木的生产力，需要考虑树木的年龄和大小。(C) 2011 Elsevier B.V.版权所有
The relationship between tree productivity and biomass not only reflects plant adaptation and the interaction of plants and the environment, but also has significant implications in global carbon cycling, climate change, and forest management. However, how biotic factors (e.g. tree age, diameter at breast height [DBH], height) and abiotic factors (e.g. elevation, latitude, and longitude) influence the relationship between tree productivity and biomass has not been well investigated. We analyzed a large database on tree productivity and biomass in China to derive the relationships between these two variables. The entire database was split into different groups by tree age, DBH, height, latitude, longitude and elevation. The relationship between productivity and biomass was developed using both a linear regression model and an allometric equation (i.e. power function) for each group. Differences in model parameters among groupings based on biotic or abiotic factors indicate the effect of each factor on the relationship between productivity and biomass. The slope of the linear regression model decreased with tree age, DBH, height, and elevation, but increased with tree density and longitude. The scaling exponent of the power function varied with tree age, height, and density following a quadratic pattern, but decreased linearly with elevation. Our results indicated that there is a significant relationship between tree productivity and biomass in China, but the relationship varies with some biotic and abiotic factors. To better predict tree productivity from biomass, tree age and size need to be considered. (C) 2011 Elsevier B.V. All rights reserved.