Soil N, P, and C dynamics of upland and seasonally flooded forests of the Brazilian Pantanal
| Autor: | Osvaldo Borges Pinto, Cloe S. Hentz, Edna Maria De Souza Carneiro, José de Souza Nogueira, George L. Vourlitis |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
0106 biological sciences
Net mineralization chemistry.chemical_element Woodland 010603 evolutionary biology 01 natural sciences Nutrient cycling Nutrient Hydrology (agriculture) lcsh:QH540-549.5 Dry season Ecology Evolution Behavior and Systematics Nature and Landscape Conservation Ecology Phosphorus Flooding (psychology) Cerrado Pantanal 04 agricultural and veterinary sciences Mineralization (soil science) Annual cycle Agronomy chemistry 040103 agronomy & agriculture 0401 agriculture forestry and fisheries Environmental science lcsh:Ecology Hyperseasonal savanna |
| Zdroj: | Global Ecology and Conservation, Vol 12, Iss C, Pp 227-240 (2017) |
| ISSN: | 2351-9894 |
| Popis: | Seasonal variations in cerrado nutrient availability and mineralization are poorly understood, especially for “hyperseasonal” cerrado, which experiences both flooding and drought over an annual cycle. Here we quantified seasonal variations in soil ammonium (NH4+), phosphorus (P), and organic C (SOC) concentration and net mineralization in upland and seasonally flooded cerrado forests of the Brazilian Pantanal, and hypothesized that NH4+, P, and SOC concentrations and net mineralization would decline under flooding and increase during the dry season as soil becomes unsaturated. We found that C and nutrient concentrations and mineralization were significantly affected by seasonal variations in hydrology; however, differences between flooded and upland forests varied over time and were not always related to flooding. Soil extractable P, but not net mineralization, was approximately 10-times higher in the upland forest, while the flooded forest had higher extractable NH4+ concentration than the upland forest under both flooded and drained conditions. Soil C concentration was significantly higher in the upland forest even though C mineralization was similar for both forests. Thus, despite the large seasonal and spatial variations in hydrology, the effects of flooding depended on the particular response variable studied and the season. While a limited survey of the literature indicates that forests exposed to intermittent flooding had on average higher concentrations of extractable NH4+ and P, the upland and hyperseasonal forests studied here were richer in extractable NH4+ (upland and flooded) and P (upland) compared to other upland and hyperseasonal forests and woodlands. Given that the forests studied here shared nearly a third of the total tree species and had similar physiognomy, these results suggest that nutrient controls on cerrado structural diversity may be similar in upland and hyperseasonal cerrado. |
| Databáze: | OpenAIRE |
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