Diana C. Garcia-Montiel

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Tropical soils are important sources of nitrous oxide (N2O) and nitric oxide (NO) emissions from the Earth’s terrestrial ecosystems. Clearing of tropical rainforest for pasture has the potential to alter N2O and NO emissions from soils by altering moisture, nitrogen supply or other factors that control N oxide production. In this review we report annual(More)
This study investigated the differences between two fast-growing tropical tree species on soil N flux and availability. The work was conducted in the island of Hawaii and included three sites located along the Hamakua coast on the northeastern side of the island. Within each site pure stands of Eucalyptus saligna (Sm.)␣and the N2-fixing Albizia falcataria(More)
Nitrous oxide (N2O) functions as a greenhouse gas in the lower atmosphere and as a destroyer of the ozone layer in the upper atmosphere. Tropical forest soils are considered the largest natural N2O source, but the spatial pattern of the emissions is poorly understood because of the relatively small number of ground measurements and the lack of a good way to(More)
The isotopic signatures of N and O in N2O emitted from tropical soils vary both spatially and temporally, leading to large uncertainty in the overall tropical source signature and thereby limiting the utility of isotopes in constraining the global N2O budget. Determining the reasons for spatial and temporal variations in isotope signatures requires that we(More)
The availability of labile organic C for microbial metabolic processes could be an important factor regulating N2O emissions from tropical soils. We explored the effects of labile C on the emissions of N2O from a forest soil in the State of Rondônia in the southwestern quadrant of the Brazilian Amazon. We measured emissions of N2O from a forest soil after(More)
The isotopic signatures of 15N and 18O in N2O emitted from tropical soils vary both spatially and temporally, leading to large uncertainty in the overall tropical source signature and thereby limiting the utility of isotopes in constraining the global N2O budget. Determining the reasons for spatial and temporal variations in isotope signatures requires that(More)
Tropical savannas commonly exhibit large spatial heterogeneity in vegetation structure. Fine-scale patterns of soil moisture, particularly in the deeper soil layers, have not been well investigated as factors possibly influencing vegetation patterns in savannas. Here we investigate the role of soil water availability and heterogeneity related to vegetation(More)
The clearing of tropical rain forest in the Amazon basin has created large areas of cattle pasture that are now declining in productivity. Practices adopted by ranchers to restore productivity to degraded pastures have the potential to alter soil N availability and gaseous N losses from soils. We examined how soil inorganic N pools, net N mineralization and(More)
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