Climate‐biomes, pedo‐biomes or pyro‐biomes: which world view explains the tropical forest–savanna boundary in South America?
Climate‐biomes, pedo‐biomes or pyro‐biomes: which world view explains the tropical forest–savanna boundary in South America?
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气候生物群落、土壤生物群落或火热生物群落：哪种世界观解释了南美洲的热带森林稀树草原边界？
DOI：
10.1111/jbi.13018
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发表时间：
2015
影响因子：
3.9
通讯作者：
Scheiter
中科院分区：
文献类型：
--
作者：
Langan;Higgins;Scheiter
目的在由降水量和温度确定的区域内，森林-稀树草原生物群落边界的位置在南美洲、非洲和澳大利亚为何不同，人们对此仍知之甚少。基于过程的动态全球植被模型（DGVMs）是一个有价值的工具，调查植被分布的决定因素，然而，许多DGVMs未能预测的空间分布或确实存在的南美稀树草原生物群落。有证据表明，火起着重要的作用，在调解森林稀树草原生物群落的边界，但是，火灾本身似乎是不足以预测这些边界在南美洲。我们假设，降水之间的相互作用，树木生根深度和火灾的限制影响稀树草原发生的概率和稀树草原森林boundary.LocationTropical森林和稀树草原网站在巴西和委内瑞拉北部的23S.MethodsWe测试我们的假设使用一种新的DGVM，aDGVM 2，它允许植物性状谱，限制性状之间的权衡，以适应非生物和生物条件。植物水力学以内聚-张力理论为代表，这使我们能够探索土壤和植物水力学如何控制生物群落分布和植物性状。由此产生的群落特征分布是模型动态的新兴特性。结果我们表明，在南美洲大部分地区，生物群落状态不仅仅由气候决定。植物生根深度，火灾和降水之间的相互作用影响观察到一个给定的生物群落状态和植物群落的紧急特征的概率。模拟植物生根深度在空间上的变化提供了最好的匹配卫星衍生的生物量估计和生成的生物群落分布，再现当代biome mapwell.Main conclusionsOur研究结果支持的论点，即多个植被状态是可能的地区是广泛的，并强调考虑火灾的影响和限制植物生根深度预测生物群落边界的重要性。
AimIt remains poorly understood why the position of the forest–savanna biome boundary, in a domain defined by precipitation and temperature, differs in South America, Africa and Australia. Process based Dynamic Global Vegetation Models (DGVMs) are a valuable tool to investigate the determinants of vegetation distributions; however, many DGVMs fail to predict the spatial distribution or indeed presence of the South American savanna biome. Evidence suggests that fire plays a significant role in mediating forest–savanna biome boundaries; however, fire alone appears to be insufficient to predict these boundaries in South America. We hypothesize that interactions between precipitation, constraints on tree rooting depth and fire affect the probability of savanna occurrence and the position of the savanna–forest boundary.LocationTropical forest and savanna sites in Brazil and Venezuela north of 23S.MethodsWe tested our hypotheses using a novel DGVM, aDGVM2, which allows plant trait spectra, constrained by trade‐offs between traits, to evolve in response to abiotic and biotic conditions. Plant hydraulics is represented by the cohesion–tension theory, this allowed us to explore how soil and plant hydraulics control biome distributions and plant traits. The resulting community trait distributions are emergent properties of model dynamics.ResultsWe showed that across much of South America the biome state is not determined by climate alone. Interactions between plant rooting depth, fire and precipitation affected the probability of observing a given biome state and the emergent traits of plant communities. Simulations where plant rooting depth varied in space provided the best match to satellite derived biomass estimates and generated biome distributions that reproduced contemporary biome maps well.Main conclusionsOur findings support the contention that areas where multiple vegetation states are possible are widespread and highlight the importance of considering the influence of fire and constraints on plant rooting depth for predicting biome boundaries.
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影响因子：
6.4
作者：
Buitenwerf, Robert;Higgins, Steven I.
通讯作者：
Higgins, Steven I.
土壤、地貌和地质对稀树草原生态系统植物群落分布的影响
影响因子：
3
作者：
M. Cole
通讯作者：
M. Cole
多种绿色色调：充满活力的热带森林-草原过渡区
DOI：
--
发表时间：
2016
期刊：
Philosophical Transactions of the Royal Society B: Biological Sciences
影响因子：
--
作者：
I. Oliveras;Y. Malhi
通讯作者：
Y. Malhi
巴西 Oxisols 水层序列的形态学、矿物学和成因1
影响因子：
2.9
作者：
J. Macedo;R. Bryant
通讯作者：
R. Bryant
DOI：
10.1111/nph.12551
发表时间：
2014-02
期刊：
The New phytologist
影响因子：
--
作者：
Glenn R. Moncrieff;S. Scheiter;W. Bond;S. Higgins
通讯作者：
Glenn R. Moncrieff;S. Scheiter;W. Bond;S. Higgins