Litterfall production in intact and selectively logged forests in southern of Amazonia as a function of basal area of vegetation and plant density

Almeida, Everton José; Luizão, Flávio J.; Rodrigues, Domingos de Jesus

doi:10.1590/1809-4392201402543

Cited by 25 publications

(16 citation statements)

References 39 publications

(40 reference statements)

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“…ano -1 e 6,22 ± 0,15 Mg.ha -1 .ano -1 para os tratamentos controle e remoção respectivamente, com diferença significativa entre os meses de março a julho ( Figura 1A). A maior produção de serapilheira foi encontrada nos meses de elevada temperatura do ar e baixa precipitação pluviométrica e umidade relativa do ar (Figura 1B), corroborando com os resultados encontrados por Almeida et al (2015). Esse padrão de deposição de serapilheira é explicado por meio de uma estratégia ecofisiológica das plantas no controle hídrico, com o fechamento dos estômatos e posteriormente abscisão foliar durante o período menos chuvoso, reduzindo a perda de água por transpiração em períodos de elevada radiação solar e baixa precipitação pluviométrica (Sanches et al, 2008;Machado et al, 2015).…”

Section: Produção De Serapilheiraunclassified

Influência da remoção de serapilheira no teor de fósforo e potássio na Amazônia Oriental

Pereira

Martins

Andrade

et al. 2017

Agraria

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RESUMOO objetivo deste estudo foi avaliar o efeito da remoção e sazonalidade da precipitação na deposição de serapilheira e teor dos nutrientes P e K em uma floresta em estágio sucessional no município de Castanhal-PA. Foram estabelecidos dois sistemas: 1) Remoção: retirada da serapilheira do solo e; 2) Controle ou testemunha: sem a retirada de serapilheira. Com isso, foram instalados 12 coletores de 1 m² em cada sistema para quantificação mensal da massa seca e obtenção dos teores de P e K. A deposição total de serapilheira foi de 6,65 e 6,24 Mg ha -1 ano -1 para os sistemas controle e remoção respectivamente, não diferindo entre si (p < 0,05). A remoção da serapilheira não alterou o teor de P e K, no entanto, houve variação ao longo dos meses, com maiores valores de P no período de maior precipitação pluviométrica, com o K apresentando padrão inverso. Portanto a produção de serapilheira apresentou-se sazonal durante o ano de e a remoção da serapilheira não causou alteração no teor de P e K, sendo que, a precipitação pluviométrica foi a variável climática que influenciou no teor desses elementos.Palavras-chave: Amazônia brasileira; ciclagem de nutrientes; floresta secundária Influence of litter removal in the content of phosphorus and potassium in Eastern Amazon ABSTRACTThe aim of this study was to evaluate the effect of removing and seasonality of precipitation on litter deposition and content of nutrients P and K in a forest successional stage in the city of Castanhal-PA. Two systems were established: 1) removal: removal of soil and litter: 2) Control or witness, without the removal of litter. With this, 12 collectors of 1 m² were installed in each system for monthly quantification of the dry mass and obtain the contents of P and K. The total litter deposition was 6.65 and 6.24 Mg ha -1 yr -1 for control systems and removal respectively, did not differ from each other (p < 0.05). The removal of litter did not change the content of P and K, however, there was change over the months, with higher P values in the period of increased rainfall, with the K featuring reverse pattern. Therefore, litter production has performed seasonal during the year and the removal of litter caused no change in P and K content, and the rainfall was the climate variable that influenced the content of these elements.

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Section: Produção De Serapilheiraunclassified

Influência da remoção de serapilheira no teor de fósforo e potássio na Amazônia Oriental

Pereira

Martins

Andrade

et al. 2017

Agraria

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“…The floristic composition has already been cited in other works as an important predictor of litter production and carbon dynamics (Facelli and Pickett 1991;Aryal et al 2015). The SA might be favored concerning litterfall due to the presence of pioneer species with higher deciduousness, which, according to Almeida et al (2015) and Aryal et al (2015), is common in degraded areas undergoing succession.…”

Section: Discussionmentioning

confidence: 92%

“…Since the climatic variations regarding the hydric availableness can affect species phenology (Wright et al 1999), it is coherent that the investment in Table 4 Parameters of the linear mixed-effects model used to model the fractions leaves, reproductive parts, fine branches and miscellany (continuous response variable) as a function of year (categorical with two levels) and their interaction Predictors reproduction is also altered (Aduan et al 2003). The production of reproductive organs mostly occurs during the wet season, to assure the permanence of the species in the ecosystem (Sakai et al 2006;Almeida et al 2015). In other hand, due the restriction of water, the plant can focus its reserves on the development of other structures as, for example, roots (Malhi et al 2011).…”

Section: Discussionmentioning

confidence: 99%

Assessing the effects of rainfall reduction on litterfall and the litter layer in phytophysiognomies of the Amazonia–Cerrado transition

Peixoto¹,

Marimon‐Junior

Cavalheiro

et al. 2018

Braz. J. Bot

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The tropical vegetation growing in dystrophic soils is capable of recycling nutrients through litterfall and thus maintaining soil fertility. However, climate changes can alter this production and, consequently, the litter layer over the soil, affecting the carbon cycle and the integrity of the ecosystem. In this study, we investigated whether a reduction in rainfall increased the litterfall and the litter layer (stock) and, if so, whether the effects are more evident in degraded environments. We compared the litterfall and the litter layer in years with higher (1575.3 mm) and lower (1360.8 mm) rainfall rates in three environments: ''cerradão'' (CD; savanna woodland), typical ''cerrado'' (savanna-like vegetation) and successional area (SA). We recorded increasing litterfall in the SA and in the litter layer in the three environments during the year with lower rainfall rates. We also detected alterations to the seasonal variation in the litter layer and the production of reproductive parts. The reduction in rainfall increased the return of carbon to the soil, especially in open areas. Our results indicate that climatic extremes (e.g., reduced rainfall) can modify the availability of nutrients and their absorption by plants and therefore compromising important ecosystem functions, such as carbon cycle.

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“…Tropical forests growing on old, strongly weathered soils such as those included in this study depend mainly on the fast decomposition and dynamics of the litter layer (Cusack et al, 2009;Parton et al, 2007;Vitousek and Sanford, 1986), which guarantee a rapid turnover of litterfall C and nutrient stocks. Considering logging can alter vegetation structure (i.e., canopy cover and tree density), the production and distribution of the litterfall can also be affected (Almeida et al, 2015;Silver et al, 2014). As a result, forest nutrient cycling and productivity can be altered by logging (Wood et al, 2009), whose impacts remain uncertain in primary forests logged for the first time.…”

Section: Biogeochemical Parameters As Sustainable Logging Indicatorsmentioning

confidence: 99%

Litter and soil biogeochemical parameters as indicators of sustainable logging in Central Amazonia

Bomfim

Silva

Pereira

et al. 2020

Science of The Total Environment

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One-fourth of Brazilian Amazonia is managed for timber production, but only a few logging sites follow sustainable forest management plans (SFMPs). Amazon forests without SFMPs are susceptible to deforestation because such plans integrate the use of forest products and conservation goals by allowing selective wood extraction following regulations. It remains uncertain whether reduced-impact selective logging (17-20 m 3 ha − 1 yr − 1 of 38-70 species), typical of SFMPs, changes forest regeneration, carbon (C) stocks, and nutrient cycling. Here, we tested the hypothesis that litter and soil biogeochemical parameters serve as indicators of sustainable logging as forest regeneration, C stocks, and C-to-nutrient ratios in soil and litter become similar to those in primary forests as time elapses after logging. We used a chronosequence spanning nine years since logging to relate litter and soil (0-10, 10-30, 30-50 cm) C stocks and 12 and 15 biogeochemical parameters, respectively, canopy cover and tree seedling density (10-150 cm tall) in sustainably managed upland evergreen Amazon forests. In one unlogged and four logged stands sampled three, five, seven, and nine years after logging, we compared 15 permanent plots (three replicated 0.5 ha plots per time-since-logging category). Five biogeochemical parameters explained >80% of the variation in soil and litter among logged and unlogged stands. Litter parameters were more sensitive to logging than soil parameters, where litter C stocks and C-to-nutrient ratios increased systematically after logging. Canopy cover decreased over time and was~14% lower nine years after logging. Total seedling density did not change consistently over time but was~54% higher seven years after logging. Our data suggest that the SFMP guidelines have served the purpose of maintaining soil quality and forest regeneration. Litter and soil parameters can be useful indicators of sustainable forest management in upland evergreen forests in Central Amazonia.

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Litterfall production in intact and selectively logged forests in southern of Amazonia as a function of basal area of vegetation and plant density

Cited by 25 publications

References 39 publications

Influência da remoção de serapilheira no teor de fósforo e potássio na Amazônia Oriental

Influência da remoção de serapilheira no teor de fósforo e potássio na Amazônia Oriental

Assessing the effects of rainfall reduction on litterfall and the litter layer in phytophysiognomies of the Amazonia–Cerrado transition

Litter and soil biogeochemical parameters as indicators of sustainable logging in Central Amazonia

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