2004
DOI: 10.1029/2003gb002210
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Abstract: [1] Changes in land-use and climate are likely to alter moisture and substrate availability in tropical forest soils, but quantitative assessment of the role of resource constraints as regulators of soil trace gas fluxes is rather limited. The primary objective of this study was to quantify the effects of moisture and substrate availability on soil trace gas fluxes in an Amazonian regrowth forest. We measured the efflux of carbon dioxide (CO 2 ), nitric oxide (NO), nitrous oxide (N 2 O), and methane (CH 4 ) fr… Show more

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Cited by 88 publications
(90 citation statements)
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“…3b). The major seasonal constraints on microbial activity are litterfall and precipitation (Vasconcelos et al, 2004;Valentini et al, 2008), so we propose that the seasonality of soil CO 2 efflux in our semi-evergreen moist tropical forest was a consequence of the decomposition of litter leachate following rainfall, seasonal priming of soil C stimulated by input of labile litter C (Sayer et al, 2007), and rewetting effects (Jarvis et al, 2007).…”
Section: Researchmentioning
confidence: 99%
“…3b). The major seasonal constraints on microbial activity are litterfall and precipitation (Vasconcelos et al, 2004;Valentini et al, 2008), so we propose that the seasonality of soil CO 2 efflux in our semi-evergreen moist tropical forest was a consequence of the decomposition of litter leachate following rainfall, seasonal priming of soil C stimulated by input of labile litter C (Sayer et al, 2007), and rewetting effects (Jarvis et al, 2007).…”
Section: Researchmentioning
confidence: 99%
“…Root respiration is strongly influenced by aboveground assimilation and growth (Horwath et al, 1994;Robinson and Scrimgeour, 1995). The heterotrophic component of soil respiration is strongly influenced by substrate availability (Raich and Tufekcioglu, 2000;Vasconcelos et al, 2004), which is closely related to aboveground litterfall on a global scale (Raich and Nadelhoffer, 1989;Davidson et al, 2002), and is thus also ultimately driven by aboveground growth and production (Rey et al, 2002). Recently, a microcosm study showed that increased litter inputs under elevated CO 2 would greatly increase microbial respiration in the soil (Liu et al, 2008) and FACE experiments have shown large increases in root respiration, which may be related to increased root biomass or higher specific root respiration rates (Andrews et al, 1999;King et al, 2001;Pregitzer et al, 2008).…”
Section: Introductionmentioning
confidence: 99%
“…Prolonged dry periods followed by rainfall cause osmotic stress in microbial cells and promote cell lysis, resulting in the release of a pulse of nutrients (Lodge et al, 1994;Wardle, 1998;Yang et al, 2008), that become available to the soil microbiota and plants (Singh et al, 1989;Srivastava, 1992). In fact, pulses of soil CO 2 efflux, possibly associated with the increase in microbial activity, were observed in the same experimental area in response to rainfall during prolonged dry periods (Vasconcelos et al, 2004). In addition, in the dry season, there is an accumulation of leaf litter as a combined consequence of increased litter production and reduced decomposition rate (Vasconcelos et al, 2007;.…”
Section: Discussionmentioning
confidence: 81%
“…Observational experiments on the effects of soil moisture usually consist of the evaluation of variables over periods of differing precipitation rates (e.g., dry and rainy periods), whereas manipulative experiments involve an increase or reduction in the input of water into the ecosystem, by irrigation or absence of precipitation, respectively (Meir et al, 2009). Our study was developed in the context of an experiment involving the manipulation of soil water availability in a secondary forest in eastern Amazonia, resulting in alterations in several processes of the ecosystem, including the flow of greenhouse gases (Vasconcelos et al, 2004), input and decomposition of leaf litter (Vasconcelos et al, 2007;, net primary productivity (Vasconcelos et al, 2012), and leaf gas exchanges (Fortini et al, 2003).…”
Section: Introductionmentioning
confidence: 99%