Allometric constraints and competition enable the simulation of size structure and carbon fluxes in a dynamic vegetation model of tropical forests (LM3PPA‐TV)
Allometric constraints and competition enable the simulation of size structure and carbon fluxes in a dynamic vegetation model of tropical forests (LM3PPA‐TV)
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异速生长约束和竞争使得能够在热带森林动态植被模型（LM3PPA-TV）中模拟尺寸结构和碳通量
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发表时间：
2020
影响因子：
11.6
通讯作者：
H. Muller‐Landau
中科院分区：
文献类型：
--
作者：
Isabel Martínez Cano;E. Shevliakova;S. Malyshev;S. J. Wright;M. Detto;S. Pacala;H. Muller‐Landau
热带森林是地球系统运作的一个关键决定因素，但仍然是碳循环模型和气候变化预测中不确定性的一个主要来源。在这项研究中，我们提出了一个更新的土地模型（LM 3 PPA ‐TV），以提高地球系统模型（ESM）中热带森林结构和动态的代表性。LM 3 PPA-TV的开发和参数化利用了来自巴拿马巴罗科罗拉多岛（BCI）的热带树木特征和长期实地普查的广泛数据集。该模型定义了一个新的植物功能类型（PFT）的基础上耐荫，热带树种的特点，实现了一个新的增长分配方案的基础上现实的树木异速生长，生物量积累的水力约束，并具有一个新的隔间的树枝和分支下降动态。模拟实验再现了观测到的林分水平碳通量和水通量的昼夜和季节模式，以及平均冠层和林下树木生长速率，树木大小分布和林分水平生物量的BCI。在多个地点进行的模拟捕捉到了整个热带森林生物群落的生物量和大小结构的相当大的变化，包括观察到的对降水和温度的反应。模型试验表明，水分限制在控制森林生物量和结构的地理变异中起着重要作用。然而，未能模拟热带森林在极端条件下和系统低估的古热带地区的森林生物量，突出了需要纳入水力性状和多个PFT的变化，捕捉不同的植物区系组成的热带域。全球变化对热带森林的持续压力需要能够模拟替代演替途径及其恢复速度的模型。LM 3 PPA-TV提供了一个调查热带森林地理变异的工具，也是一个继续提高热带森林动态及其在ESM中碳储存潜力的代表性的基准。
Tropical forests are a key determinant of the functioning of the Earth system, but remain a major source of uncertainty in carbon cycle models and climate change projections. In this study, we present an updated land model (LM3PPA‐TV) to improve the representation of tropical forest structure and dynamics in Earth system models (ESMs). The development and parameterization of LM3PPA‐TV drew on extensive datasets on tropical tree traits and long‐term field censuses from Barro Colorado Island (BCI), Panama. The model defines a new plant functional type (PFT) based on the characteristics of shade‐tolerant, tropical tree species, implements a new growth allocation scheme based on realistic tree allometries, incorporates hydraulic constraints on biomass accumulation, and features a new compartment for tree branches and branch fall dynamics. Simulation experiments reproduced observed diurnal and seasonal patterns in stand‐level carbon and water fluxes, as well as mean canopy and understory tree growth rates, tree size distributions, and stand‐level biomass on BCI. Simulations at multiple sites captured considerable variation in biomass and size structure across the tropical forest biome, including observed responses to precipitation and temperature. Model experiments suggested a major role of water limitation in controlling geographic variation forest biomass and structure. However, the failure to simulate tropical forests under extreme conditions and the systematic underestimation of forest biomass in Paleotropical locations highlighted the need to incorporate variation in hydraulic traits and multiple PFTs that capture the distinct floristic composition across tropical domains. The continued pressure on tropical forests from global change demands models which are able to simulate alternative successional pathways and their pace to recovery. LM3PPA‐TV provides a tool to investigate geographic variation in tropical forests and a benchmark to continue improving the representation of tropical forests dynamics and their carbon storage potential in ESMs.
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影响因子：
5.5
作者：
Robert Muscarella;Samira Kolyaie;D. Morton;J. Zimmerman;M. Uriarte
通讯作者：
Robert Muscarella;Samira Kolyaie;D. Morton;J. Zimmerman;M. Uriarte
影响因子：
2
作者：
Wright, S. Joseph;Calderón, Osvaldo;Muller-Landau, Helene C.
通讯作者：
Muller-Landau, Helene C.
秘鲁亚马逊流域西南部两片低地热带森林的生产力、新陈代谢和碳循环
影响因子：
1.5
作者：
Malhi Y
通讯作者：
Malhi Y
影响因子：
8.8
作者：
Fyllas, Nikolaos M.;Bentley, Lisa Patrick;Malhi, Yadvinder
通讯作者：
Malhi, Yadvinder