Relative influence of environmental, stand factors and functional traits on allocation of forest productivity during the restoration of subtropical forests in central China
Relative influence of environmental, stand factors and functional traits on allocation of forest productivity during the restoration of subtropical forests in central China
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中部地区亚热带森林恢复过程中环境、林分因子和功能性状对森林生产力配置的相对影响
DOI：
10.1016/j.foreco.2020.118814
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发表时间：
2021-02
影响因子：
3.7
通讯作者：
Guo Zhiwen
中科院分区：
文献类型：
--
作者：
Ma Shupeng;Wang Xiangping;Wang Xuemei;Sun Haozhe;Guo Zhiwen
许多研究探讨了植物叶片、茎和根器官间生物量分配与环境和个体发生因素的关系。但是，林分生产力在恢复阶段分配的驱动因素，以及功能性状的潜在作用，仍然知之甚少。本文对神农架亚热带森林的24个样地进行了4个恢复阶段的研究。研究了环境因子（坡度、坡向和林冠开度）、林分因子（林高、总基面积、林分密度和林龄）和关键功能性状（木材密度和比叶面积）的群落加权平均值（CWM）对森林生产力向茎、叶和根分配的相对影响。结果表明：森林生产力和林分生产力的茎占比在森林恢复过程中均有所增加；而叶片和根系生产力分数总体呈下降趋势。在恶劣的立地条件下，叶片和根系的生产力分配比例较高，而茎的生产力分配比例较低。茎分数与林龄、林高呈正相关，而根分数与林龄、林高呈正相关。茎、叶、根分数与竞争指标（林分密度和总基面积）均无显著相关。在功能性状的影响上，茎生产力分数与木材密度CWM呈负相关，而叶生产力分数与木材密度CWM呈正相关，这可以由最优理论和生长策略共同解释。而比叶面积水肥对生产力分配无显著影响。多变量分析表明，地形（坡度）和林龄是影响林分生产力分配给木本器官（茎和根）的主要因素，木材密度对林分生产力分配也有重要影响。同时，叶分数主要受木材密度和坡向的影响。结果表明，除了环境和林分因素外，功能性状（如木材密度）也对林分生产力的分配有重要影响。然而，关于功能性状的影响仍有许多模棱两可的结果。在生态系统过程模型中，生产力在各器官之间的分配和关键功能性状（如木材密度和比叶面积）都是不可或缺的参数。为了更好地预测未来全球变化下的森林碳平衡，更好地指导森林经营，增加生态系统服务和碳汇，需要进一步研究功能性状和林分因子对生产力配置的影响机制。
Many studies have examined plant biomass allocation among leaf, stem and root organs in relation to environmental and ontogenetic factors. But the drivers for allocation of stand-level productivity across restoration stages, and the potential role of functional traits, are still poorly understood. Here we investigated 24 plots across four restoration stages in subtropical forests on Mt. Shennongjia, central China. We examined the relative effects of environment (slope, aspect and canopy openness), stand factors (forest height, total basal area, stand density and age), and community-weighted mean (CWM) of key functional traits (wood density and specific leaf area), on the allocation of forest productivity to stems, leaves and roots. The results showed that forest productivity, and the stem fraction of stand productivity, both increased during forest restoration; while leaf and root productivity fractions showed an overall decrease. A higher fraction of productivity was allocated to leaves and roots while lower fraction was allocated to stems towards harsher site condition. Stem fraction was positively related to stand age and forest height, whereas root fraction showed a converse pattern. None of the stem, leaf or root fraction was significantly correlated with the proxies of competition (stand density and total basal area). As for the effect of functional traits, stem productivity fraction was negatively related to the CWM of wood density, while leaf fraction was positively related, which can be explained by the optimal theory and growth strategy together. However, CWM of specific leaf area has no significant effect on productivity allocation. Multivariate analyses showed that topography (slope) and stand age were main drivers for the productivity allocation to woody organs (stem and root), and wood density was also important for stem productivity fraction. Meanwhile, leaf fraction is mainly affected by wood density and aspect. Our results suggest that, in addition to environmental and stand factors, functional traits (e.g. wood density) are also important in affecting the allocation of stand productivity. However, there are still many equivocal results about the influence of functional traits. Allocation of productivity among organs, and key functional traits (e.g. wood density and specific leaf area), are both indispensable parameters in ecosystem processes models. Further studies are needed to explore the mechanisms how functional traits and stand factors affect productivity allocation, to better predict forest carbon balance under future global change, and to better guide forest management to increase ecosystem services and carbon sink.
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影响因子：
2.7
作者：
Gonzalez-Paleo, L.;Ravetta, D. A.
通讯作者：
Ravetta, D. A.
影响因子：
3.7
作者：
Xiangping Wang;S. Ouyang;O. Sun;Jingyun Fang
通讯作者：
Xiangping Wang;S. Ouyang;O. Sun;Jingyun Fang
影响因子：
4.2
作者：
J. Thornley
通讯作者：
J. Thornley
竞争增加了中国亚热带杉木人工林的细根生物量
影响因子：
3.7
作者：
Yingchun Liao;Houbao Fan;Xiaohua Wei;Jianping Wu;Honglang Duan;Xiaoli Fu;Wenfei Liu;Huimin Wang;Xinwu Zhan;Pu Tang;Feng Li
通讯作者：
Feng Li
影响因子：
3.2
作者：
G. Barrientos;A. Iroumé
通讯作者：
G. Barrientos;A. Iroumé