Cambial growth dynamics and climatic control of different tree life forms in tropical mountain forest in Ethiopia

Krepkowski, Julia; Bräuning, Achim; Gebrekirstos, Aster; Strobl, Simone

doi:10.1007/s00468-010-0460-7

Cited by 91 publications

(77 citation statements)

References 33 publications

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“…3). This is consistent with the results of Huete et al (2006), which indicated a strong influence of radiation on leaf phenology, and previous ground-based studies in tropical forests which have highlight an exchange of leaves and a reduced wood production during drier months (O'Brien et al, 2008;Rice et al, 2004;Krepkowski et al, 2011). However, our results do not support a predominant role of radiation in forest productivity expressed as wood production (Fig.…”

Section: Wood Productionsupporting

confidence: 90%

Asynchronism in leaf and wood production in tropical forests: a study combining satellite and ground-based measurements

Wagner

Rossi²,

Stahl

et al. 2013

Biogeosciences

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Abstract. The fixation of carbon in tropical forests mainly occurs through the production of wood and leaves, both being the principal components of net primary production. Currently field and satellite observations are independently used to describe the forest carbon cycle, but the link between satellite-derived forest phenology and field-derived forest productivity remains opaque. We used a unique combination of a MODIS enhanced vegetation index (EVI) dataset, a wood production model based on climate data and direct litterfall observations at an intra-annual timescale in order to question the synchronism of leaf and wood production in tropical forests. Even though leaf and wood biomass fluxes had the same range (respectively 2.4 ± 1.4 and 2.2 ± 0.4 Mg C ha −1 yr −1 ), they occurred separately in time. EVI increased with leaf renewal at the beginning of the dry season, when solar irradiance was at its maximum. At this time, wood production stopped. At the onset of the rainy season, when new leaves were fully mature and water available again, wood production quickly increased to reach its maximum in less than a month, reflecting a change in carbon allocation from short-lived pools (leaves) to long-lived pools (wood). The time lag between peaks of EVI and wood production (109 days) revealed a substantial decoupling between the leaf renewal assumed to be driven by irradiance and the water-driven wood production. Our work is a first attempt to link EVI data, wood production and leaf phenology at a seasonal timescale in a tropical evergreen rainforest and pave the way to develop more sophisticated global carbon cycle models in tropical forests.

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Section: Wood Productionsupporting

confidence: 90%

Asynchronism in leaf and wood production in tropical forests: a study combining satellite and ground-based measurements

Wagner

Rossi²,

Stahl

et al. 2013

Biogeosciences

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“…In Sertânia, we assume that the plants used their accumulated water reserves to satisfy the demand for growth stimulated by photoperiod. For many deciduous species growth is only initiated after the sprouting of new leaves, as shown for Celtis africana in Ethiopia (KREPKOWSKI et al, 2011). Markesteijn et al (2010) also highlight the difference of tolerance and leaf phenology associated with soil water potential that suffers influence of temporal variation, mainly depending on the annual rainfall cycle and spatial variation that results from topography and vertical distribution of water in soil layers.…”

Section: Tenuiflora Grew At Least 44% More In the Open Areas With mentioning

confidence: 88%

CLIMATE-TREE GROWTH RELATIONSHIPS OF Mimosa tenuiflora IN SEASONALLY DRY TROPICAL FOREST, BRAZIL

Mattos

Braz

Domene

et al. 2015

CERNE

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Mimosa tenuiflora is a native pioneer tree from the Caatinga used commercially as firewood due to its high calorific value. It is deciduous, its trunk does not reach large diameters and it has good regrowth capacity. This study intended to determine the annual increment in diameter of M. tenuiflora and its correlation with rainfall, as basis for fuel wood management. Disks from the stem base of M. tenuiflora trees were collected in 2008 in Sertânia and Serra Talhada, Pernambuco State, from regrowth of trees coppiced in 2003 and in Limoeiro do Norte, Ceará State, from a plantation established in 2002. The trees have well-defined annual growth rings, highly correlated with annual precipitation and are well-suited for dendrochronological investigations. Forest managers must consider the influence of previous drier years in the wood production when predicting fuel wood harvesting. The high growth correlation with the previous year's rainfall in regions where the rains start after photoperiodic stimulation indicate the necessity of understanding the growth dynamics of the species under dry forest conditions through additional ecophysiology studies. RELAÇÃO CLIMA-CRESCIMENTO DE ÁRVORES DE Mimosa tenuiflora EM FLORESTA TROPICAL SECA SAZONAL, BRAZILRESuMO: Mimosa tenuiflora é uma árvore pioneira e nativa da Caatinga usada, comercialmente, para lenha, em razão do seu elevado poder calorífico. É decídua, com perda de folhas no final da estação chuvosa, seu tronco não atinge grandes diâmetros e tem boa capacidade de rebrota. Este estudo tem por objetivo determinar o incremento anual em diâmetro de M. tenuiflora e sua correlação com a precipitação, visando a subsidiar o manejo florestal de madeira para energia. Discos da base do tronco de árvores de M. tenuiflora foram coletados em 2008, em

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“…Mais recentemente, análises do crescimento das árvores vêm sendo empregadas para compreensão das respostas das espécies diante das mudanças climáticas, ocasionadas por ações antrópicas ou naturais, na tentativa de prever alterações na estrutura florestal decorrentes dessas novas condições (CLARK et al, 2010;WAGNER et al, 2012). Assim, a avaliação do CCT do tronco das árvores pode ser uma forma de caracterizar a autoecologia das espécies e o funcionamento de florestas, contribuindo para o manejo adequado e o sucesso de reflorestamentos em cenários futuros (KREPKOWSKI et al, 2011). Adicionalmente, a avaliação da dinâmica de crescimento pode, também, determinar os ciclos de formação da madeira (CLARK et al, 2010;KREPKOWSKI et al, 2011) e, indiretamente, fornecer inferências sobre a atividade cambial e a formação dos anéis de crescimento das árvores, de forma a contribuir para estudos dendrocronológicos e dendroecológicos WIMMER, 2001;LISI et al, 2008).…”

Section: Introductionunclassified

“…Assim, a avaliação do CCT do tronco das árvores pode ser uma forma de caracterizar a autoecologia das espécies e o funcionamento de florestas, contribuindo para o manejo adequado e o sucesso de reflorestamentos em cenários futuros (KREPKOWSKI et al, 2011). Adicionalmente, a avaliação da dinâmica de crescimento pode, também, determinar os ciclos de formação da madeira (CLARK et al, 2010;KREPKOWSKI et al, 2011) e, indiretamente, fornecer inferências sobre a atividade cambial e a formação dos anéis de crescimento das árvores, de forma a contribuir para estudos dendrocronológicos e dendroecológicos WIMMER, 2001;LISI et al, 2008).…”

Section: Introductionunclassified

Periodicidade do crescimento de espécies arbóreas da Floresta Estacional Semidecidual no Sul do Brasil

Blagitz¹,

Botosso²,

Bianchini³

et al. 2016

Sci. For.

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ResumoEmbora a sazonalidade climática seja menos evidente nas regiões tropicais que nas temperadas, muitas espécies tropicais apresentam crescimento rítmico. A avaliação do crescimento em circunferência do tronco (CCT) permitirá obter informações sobre o desenvolvimento dos indivíduos de espécies arbóreas desta região. Esse estudo teve como objetivo avaliar o CCT de 11 espécies arbóreas de uma floresta estacional semidecidual no sul do Brasil, visando testar duas hipóteses: (i) existe sazonalidade no CCT das árvores e este crescimento está relacionado às variações climáticas da região de estudo; (ii) as características dos indivíduos (posição sociológica, altura da árvore, grau de ocupação por lianas, deciduidade e diâmetro à altura do peito) influenciam no incremento acumulado em circunferência. Para detectar a periodicidade do CCT foram implantadas faixas dendrométricas permanentes no tronco (altura do DAP) de 156 indivíduos. O acompanhamento do crescimento foi realizado mensalmente por um período de 18 meses. Foram feitas correlações do CCT mensal com a precipitação, temperatura e fotoperíodo para verificar a influencia dos fatores ambientais e análise de covariância para averiguar se as características dos indivíduos também interferiram no incremento acumulado em circunferência do tronco. As espécies apresentaram um padrão sazonal de CCT, com as maiores taxas de crescimento de outubro a dezembro, sendo que os parâmetros ambientais avaliados atuaram em conjunto -principalmente o fotoperíodo e a temperatura -promovendo essa sazonalidade e confirmando a primeira hipótese. Considerando as características dos indivíduos, somente o diâmetro do tronco correlacionou-se negativamente com o incremento acumulado em circunferência (b = -0,32; p = 0,02), aceitando parcialmente a segunda hipótese. Palavras-chave: deciduidade, floresta tropical, grupos sucessionais, Mata Atlântica, sazonalidade. AbstractAlthough seasonality is less evident in the tropics than in temperate ones, many tropical species present rhythmic growth. The stem circumference growth (SCG) evaluation will provide information on the development of tree species in this region. This study aimed to evaluate the SCG of 11 tree species of a tropical semi-deciduous forest in Southern Brazil. Two hypotheses were advanced: (i) seasonality of the trees SCG exist and it is related to climatic variations of the study area; (ii) individual characteristics (tree height, degree of occupancy by lianas, sociological position, deciduousness and diameter at breast height) influence the circumference cumulative growth. To detect the SCG periodicity, permanent dendrometric bands were fixed around the stem (diameter at breast height, or DBH) of 156 individuals. Growth was monitored monthly for a period of 18 months. Correlations of monthly SCG with precipitation, temperature and photoperiod were made to verify the environmental parameters' influence and a covariance analysis was performed to enquire if individual characteristics also affected cumulative increase in circumfer...

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Cambial growth dynamics and climatic control of different tree life forms in tropical mountain forest in Ethiopia

Cited by 91 publications

References 33 publications

Asynchronism in leaf and wood production in tropical forests: a study combining satellite and ground-based measurements

Asynchronism in leaf and wood production in tropical forests: a study combining satellite and ground-based measurements

CLIMATE-TREE GROWTH RELATIONSHIPS OF Mimosa tenuiflora IN SEASONALLY DRY TROPICAL FOREST, BRAZIL

Periodicidade do crescimento de espécies arbóreas da Floresta Estacional Semidecidual no Sul do Brasil

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