2017
DOI: 10.1007/s10533-017-0386-x
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Biological versus geochemical control and environmental change drivers of the base metal budgets of a tropical montane forest in Ecuador during 15 years

Abstract: To assess the susceptibility of the base metal budget of a remote tropical montane forest in Ecuador to environmental change, we determined the extent of biological control of base metal fluxes and explored the impact of atmospheric inputs and precipitation, considered as potential drivers of ecosystem change, on the base metal fluxes. We quantified all major base metal fluxes in a ca. 9.1 ha forested catchment from 1998 to 2013. Mean (±s.d.) annual flux to the soil via throughfall ? stemflow ? litterfall was… Show more

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Cited by 20 publications
(38 citation statements)
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“…However, the weathering release at our study site was still higher than the estimates of 4.41 mg/(m 2 year) for metamorphic rocks and 8.53 mg/(m 2 year) for the global mean weathering release (Hartmann et al, ). Generally low weathering rates were also found for base metals (Ca, K, Mg, and Na) at our study site (Wilcke et al, ). Low weathering rates at our study site were also reflected by the finding that the export of dissolved P with ST (Figure ) was at the lower end of the range of 1–1,300 mg/(m 2 year) reported for several temperate and tropical forested catchments (Figure ; Bol et al, ).…”
Section: Discussionsupporting
confidence: 56%
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“…However, the weathering release at our study site was still higher than the estimates of 4.41 mg/(m 2 year) for metamorphic rocks and 8.53 mg/(m 2 year) for the global mean weathering release (Hartmann et al, ). Generally low weathering rates were also found for base metals (Ca, K, Mg, and Na) at our study site (Wilcke et al, ). Low weathering rates at our study site were also reflected by the finding that the export of dissolved P with ST (Figure ) was at the lower end of the range of 1–1,300 mg/(m 2 year) reported for several temperate and tropical forested catchments (Figure ; Bol et al, ).…”
Section: Discussionsupporting
confidence: 56%
“… Simplification of equation () based on the assumptions that Δ B i , ΔOM i , and Δ X i equaled zero and Δ M i total suspended particles (TSP i ). Justifications: Δ B i does not change, because the studied forest is an old growth native forest in steady state. ΔOM i does not change because we did not find significant differences ( t test, p < 0.05) in (i) the thickness of the organic layer, (ii) the C concentrations, and (iii) the C/N ratios of A and B horizons did not change between our two surveys in 1998 and 2007 (organic layer thickness: 12 ± 8.2 cm; C concentrations: 29 ± 16 and 10 ± 7.1 g/kg and C/N ratios: 14 ± 2.9 and 10 ± 3.3 in the A and B horizons, respectively; n = 20 soils of which 10 were in slope and 10 in valley bottom position, Wilcke et al, ). Δ X i does not change because soil development (Δ M ) was assumed to equal the erosional loss of secondary minerals, which is measured as TSP . This assumption is based on the observation that the study soils were all shallow (usually hardly deeper than 0.5 m and rich in stones; Wilcke et al, ) and did not show a further development than to the state of a Cambisol (IUSS Working Group WRB, ) in spite of the tropical perhumid climate. We therefore assumed that continuous erosion kept the soils at a steady‐state young development stage …”
Section: Methodsmentioning
confidence: 75%
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