pH of bulk precipitation during 3 consecutive annual courses in the Trachypogon savannas of the Orinoco Llanos, Venezuela

Montes, R.; Jose, Juan; García‐Miragaya, J.; Parra, Norberto

doi:10.1111/j.1600-0889.1985.tb00078.x

Cited by 9 publications

(7 citation statements)

References 9 publications

(6 reference statements)

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“…In the more industrialised, northern part of Venezuela, highly acidic precipitation as a consequence of sugarcane burning [15,16] or industrial activity [16] have been reported. However, measurements of pH in Mantecal rain water were not particularly low, ranging from 5.1 at the end of the wet season (November) to 5.8 at the beginning of the wet season (Table 2), a value similar to that reported by Montes et al [17] for the Trachypogon savannas of the Orinoco River.…”

Section: Input Of Zn and Cusupporting

confidence: 62%

Biogeochemistry and cycling of zinc and copper in a dyked seasonally flooded savanna

López‐Hernández

2008

Chemistry and Ecology

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There is very little information on the cycling of heavy metals in natural savannas. Venezuelan flooded savannas are characterised by acid soils with redox conditions which might induce Zn and Cu solubilisation. In those flooded savannas a network of small dykes has been constructed to control floods. The biomass accretion after dyking and the abundance of clay particles in the vertisols, dominant in the overflow plains, might be responsible for an increase in nutrient uptake and immobilisation. Due to the redox and pH conditions prevailing during flooding, some questions arise on the fate of the heavy metals. Are they significantly lost as soluble and particulate forms, which in turn, can induce a potential risk of microelement deficiency? Or, on the contrary, are heavy metal inputs in precipitation waters retained somewhere in the terrestrial pools of the watershed allowing for an adequate micronutrient economy? By using inputoutput budgets, which consider the total atmospheric input and total output in stream runoff (soluble and particulate) for zinc and copper we concluded that in Mantecal flooded savannas, a net accumulation of micronutrient in soils is actually occurring through organic and inorganic complexes, a process that is counterbalanced by the losses of particulates through erosion.

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Section: Input Of Zn and Cusupporting

confidence: 62%

Biogeochemistry and cycling of zinc and copper in a dyked seasonally flooded savanna

López‐Hernández

2008

Chemistry and Ecology

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“…A standard rainwater gauge was placed in the centre of the same. The system for sample collection has been described in detail by Montes et al (1985), with the following characteristics: the containers remained open throughout the study period; the samples include a combination of wet precipitation and dry deposition, defined as bulk precipitation (Whitehead & Feth 1964).…”

Section: Methodsmentioning

confidence: 99%

Chemical composition and nutrient loading by precipitation in the Trachypogon savannas of the Orinoco llanos, Venezuela

Montes

Jose

1989

Biogeochemistry

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Samples of bulk precipitation were collected in the Trachypogon savanna, Calabozo, Venezuela, during three consecutive years. In the first year, rain samples were taken daily; in the following years the samples were grouped on a monthly basis. In addition, samples of dry deposition were collected during the dry seasons. All samples were analyzed for the following water soluble cations and anions: PO,-P, SO 4 -S, NO,-N, NH 4 -N, Ca+2, Mg + 2 , K +, Na + and H + . The mean annual input rate of chemical constituents (Kg ha ' year ') was: PO 4 -P (0.42); SO4-S (2.62); NO,-N (0.21); NH 4 -N (2.03); Ca +2 (3.50); Mg + 2 (11.31); K + (3.60); Na + (5.93) and H + (0.03). The total mean input of particulate material to the savanna during the dry season was 2.06Kgha-'year-', with a soluble fraction of 30%. Possible sources of nutrients input were analyzed.

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“…6 and 5.8 for 1981, 1982 and 1983, respectively. Therefore, with the exception of values given by Montes et al (1985) for a savannah site, rainfall pH in rural sites of tropical America is around or below 5.0. In the present paper, in samples strictly collected by events, rainfall pH values are reported for three sites of the Venezuelan savannah.…”

Section: Savannah Sitesmentioning

confidence: 81%

“…The only values reported for a savannah site correspond to bulk deposition samples collected at Calabozo, Venezuela (Montes et al, 1985). The volume-weighted mean pH's reported were 5.8, 5.…”

Section: Savannah Sitesmentioning

confidence: 99%

Rainfall pH in the Venezuelan savannah

Sanhueza¹,

Graterol²,

Rondôn³

1987

Tellus B

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pH of bulk precipitation during 3 consecutive annual courses in the Trachypogon savannas of the Orinoco Llanos, Venezuela

Cited by 9 publications

References 9 publications

Biogeochemistry and cycling of zinc and copper in a dyked seasonally flooded savanna

Biogeochemistry and cycling of zinc and copper in a dyked seasonally flooded savanna

Chemical composition and nutrient loading by precipitation in the Trachypogon savannas of the Orinoco llanos, Venezuela

Rainfall pH in the Venezuelan savannah

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