Soil nutrients, forest structure and species traits drive aboveground carbon dynamics in an old-growth temperate forest
Soil nutrients, forest structure and species traits drive aboveground carbon dynamics in an old-growth temperate forest
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土壤养分、森林结构和物种特征驱动古老温带森林的地上碳动态
DOI：
10.1016/j.scitotenv.2019.135874
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发表时间：
2020-02-25
影响因子：
9.8
通讯作者：
Jin, Guangze
中科院分区：
文献类型：
--
作者：
Cai, Huiying;Li, Fengri;Jin, Guangze
森林储存了大量的陆地碳，但对森林碳动态的驱动因素仍然知之甚少，特别是在古老的森林中。在这里，我们评估地上C动力学（即，净碳变化及其人口过程：C从幸存树木的生长中获益（Delta C-surv），从补充树木的生长中获得的C（Δ C-recr）和树木死亡率的碳损失（Delta C-mort））由植被属性驱动（多样性、特征组成和森林结构）和生境条件（土壤性质和光环境），以及Δ C-surv，Δ C-recr和Δ C-mort如何对净C变化做出贡献。利用10年的人口统计数据，从9公顷的永久样地在中国东北部的古老的温带森林，我们进行了结构方程模型的植被属性和生境条件的C动态。净C变化最强地由Δ C-mort决定。高土壤磷浓度增加三角洲C-surv。土壤水分增加了Δ C-recr，叶面积指数增加了Δ C-sury和Δ C-recr。多样性（即，结构多样性与Δ C-sury呈正相关，但与Δ C-rea或Δ C-mort无关。性状组成与所有三个人口统计过程显着相关。森林结构对Delta C-sury和AC-recr的预测效果最好。净碳变化随着土壤磷浓度和断面积的增加而增加，在以保守性状为主的群落中（即，高木材密度）。这项研究强调，土壤养分，森林结构和性状组成的重要驱动力的净碳变化在古老的温带森林。通过对自然生态系统中植被属性和生境条件下碳动态的同时评价，可以更好地了解碳储量和生产力。(C)2019爱思唯尔B. V.保留所有权利。
Forests store a substantial amount of terrestrial carbon (C), but the drivers of forest C dynamics remain poorly understood, especially in old-growth forests. Here, we evaluate how aboveground C dynamics (i.e., net C change and its demographic processes: C gain from the growth of surviving trees (Delta C-surv), C gain from the growth of recruited trees (Delta C-recr) and C loss by tree mortality (Delta C-mort)) are driven by vegetation attributes (diversity, trait composition and forest structure) and habitat conditions (soil properties and light environment), as well as how Delta C-surv, Delta C-recr and Delta C-mort contribute to net C change. Using 10-year interval demographic data from a 9-ha permanent plot in an old-growth temperate forest in northeastern China, we performed structural equation model to relate the C dynamics to the vegetation attributes and habitat conditions. The net C change is most strongly determined by Delta C-mort. High soil phosphorus concentrations increased Delta C-surv. soil moisture increased Delta C-recr, and leaf area index increased both Delta C-sury and Delta C-recr. Diversity (i.e., structural diversity) had a positive relationship with Delta C-sury but was not related to Delta C-rea or Delta C-mort. Trait composition was significantly related to all three demographic processes. Forest structure was the best predictor of Delta C-sury and AC-recr. The net C change increased with higher soil phosphorus concentrations and basal area and in communities dominated by conservative traits (i.e., high wood density). This study highlights that soil nutrients, forest structure and trait composition are important drivers of net C change in old-growth temperate forests. Better insights into C storage and productivity can be gained by simultaneously evaluating the vegetation attributes and habitat conditions of C dynamics in natural ecosystems. (C) 2019 Elsevier B.V. All rights reserved.