Reduced tree density and basal area in Andean forests are associated with bamboo dominance
Reduced tree density and basal area in Andean forests are associated with bamboo dominance
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安第斯森林中树木密度和断面积的减少与竹子的优势有关
DOI：
10.1016/j.foreco.2020.118648
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发表时间：
2021
影响因子：
3.7
通讯作者：
Feeley, Kenneth J.
中科院分区：
文献类型：
--
作者：
Fadrique, Belen;Santos-Andrade, Paul;Farfan-Rios, William;Salinas, Norma;Silman, Miles;Feeley, Kenneth J.
森林结构和组成对决定热带森林的碳贮量起着至关重要的作用。安第斯森林具有巨大的碳积累潜力，包括大片高密度的木本竹子群落。木本竹子可能会改变森林结构、组成和动态，从而影响碳储存能力；然而，它们通常被排除在森林监测和建模之外。为了记录竹子丰度的格局及其与森林结构的关系，我们在7个1公顷的长期森林监测样地上进行了竹子普查，这些样地分布在一个大的海拔梯度(1000-3600平方英里)。在秘鲁安第斯山脉。我们确定竹子是研究区的优势植物类群。在每个样地中，竹子是最常见的属，在两个样地中，竹子是断面积最大的物种之一。我们使用广义线性混合模型(GLMM)和结构方程模型(SEM)相结合的方法来假设因果框架，并确定竹子丰度(断面积)对单株株数、总断面积、平均断面积、平均树木生长率和树木死亡率的影响的方向和大小。我们发现，竹子丰富度与树木总断面积之间总体上呈负相关，主要是由于树木密度的减少(直接和间接地通过树木死亡率的增加来调节)。然而，树木密度的减少和树木死亡率的增加也与树木直径(平均树木断面积)的小幅增加有关。总体而言，竹子丰度与树木断面积之间的负相关表明，在以竹子为主的安第斯森林中，生物量积累较低，因此树木的碳贮量较低。我们的结果表明了竹子在确定森林功能方面的重要性，强调了在监测工作和建模研究中包括竹子的必要性。
Forest structure and composition play an essential role in determining the carbon storage capacity of tropical forests. Andean forests, with great potential for carbon accumulation, include large expanses of high-density woody bamboo communities. Woody bamboos can potentially alter forest structure, composition and dynamics and thus can affect carbon storage capacity; however, they are commonly excluded from forest monitoring and modelling. With the aim of documenting patterns of bamboo abundance and disentangling its association with forest structure, we carried out a bamboo census in seven 1-ha long-term forest monitoring plots situated across a large elevation gradient (1000–3600 m a.s.l.) in the Peruvian Andes. We determined that bamboo is a dominant plant group in the study area. In every plot, bamboos were the most common genera in terms of number of stems, and in two of the plots bamboo species were among those with the greatest basal area. We used a combination of Generalized linear mixed models (GLMM) and structural equation modelling (SEM) to hypothesize a causal framework and determine the direction and size of the effects of bamboo abundance (basal area) on number of individual trees, total tree basal area, mean tree basal area, mean tree growth rate and tree mortality rate. We found an overall negative association between bamboo abundance and total tree basal area driven mainly by reduced tree density (directly and indirectly mediated by an increase in tree mortality). However, the decrease in tree density and the increase in tree mortality are also associated with a small increase in tree diameter (mean tree basal area). Overall, the negative association between bamboo abundance and tree basal area suggests a lower biomass accumulation and thus a lower carbon storage capacity of trees in Andean forests where bamboo is dominant. Our results, which show the importance of bamboo in determining forest function, highlight the need for including bamboo in monitoring efforts and modeling studies.
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