Nutrient fluxes in incident rainfall, throughfall, and stemflow in adjacent primary and secondary forests of the Gran Sabana, southern Venezuela

Nutrient Input via Incident Rainfall in a Eucalyptus dunnii Stand in the Pampa biome

“…After interaction with the canopy, all ions in the throughfall solution were enriched, with higher concentrations of Cl These findings were consistent with those observed in the native forests of Venezuela (Dezzeo & Chacón, 2006), in Quercus stands (Rodà et al, 1990), and in the native forests of India (Prakasa Rao et al, 1995).…”

“…The accumulation of dust and ash on the canopy, which are carried after the leaf intercepts water, may have led to the increase in ion concentrations, as can be observed in the present and previous studies (Shen et al, 2013;Heartsill-Scalley et al, 2007;Balestrini et al, 2007;Dezzeo & Chacón, 2006). After interaction with the canopy, all ions in the throughfall solution were enriched, with higher concentrations of Cl These findings were consistent with those observed in the native forests of Venezuela (Dezzeo & Chacón, 2006), in Quercus stands (Rodà et al, 1990), and in the native forests of India (Prakasa Rao et al, 1995).…”

Disproportionate single-species contribution to canopy-soil nutrient flux in an Amazonian rainforest

“…Throughfall enrichment ratios of K þ greater than 10, as found in this study, are common in tropical forests in Brazil, Cameroon and Venezuela (Chuyong et al, 2004;Dezzeo and Chacon, 2006;Filoso et al, 1999;Forti and Moreira-Nordemann, 1991), secondary tropical forests in Brazil and Nigeria (Hölscher et al, 1998;Muoghalu, 2003), montane evergreen forest in China (Liu et al, 2002), as well as in forests in Japan and Spain (Bellot and Escarre, 1991;Chiwa et al, 2010;Rodrigo et al, 2003). Stemflow enrichment ratios of K þ exceeding 40 as we found are less common, but were found in a lowland Amazon forest (Dezzeo and Chacon, 2006), a montane evergreen forest in the Chinese Ailao Mountains (Liu et al, 2002), a mixed oak-beech forest in the Belgian Ardennes (André et al, 2008a), and a Douglas-fir plantation in the French Beaujolais Mountains (Marques and Ranger, 1997).…”

Temporal variations of isotopic compositions in gross rainfall, throughfall, and stemflow under a Japanese cedar forest during a typhoon event

“…Many studies have been conducted on stemflow solute chemistry regarding the addition of nutrients to forest floor and the biogeochemical cycle within the forest (Adams and Attiwill, 1991;Liu et al, 2004;Dezzeo and Chacón, 2006). On the other hand, stemflow isotopic characteristics especially for oxygen and hydrogen isotopes are poorly understood.…”