In situ methane and nitrous oxide fluxes in soil from a transect in Hennequin Point, King George Island, Antarctic

Methane and nitrous oxide fluxes in relation to vegetation covers and bird activity in ice-free soils of Rip Point, Nelson Island, Antarctica

“…The daily N 2 O flux evaluated at the Deschampsia antarctica site during the analysis period coincided with a WFPS above 80%, suggesting conditions for denitrification. Similar results were found by Vieira et al (2012). Among the sites in this study, this one had the highest temperature in the sampling period.…”

“…The bare soil and Sanionia uncinata sites had N 2 O accumulated emissions close to zero, which was also observed in bare alluvium soil on an adjacent island, at Hennequin Point (Vieira et al 2012). These two sites had N 2 O influx rates during two sampling events, while the lichen soil site had influx during one sampling day.…”

“…Rates of increase in gas concentration inside the chamber were estimated by the slope from the linear regression between time of sampling (0, 30, 60 and 90 min) and gas concentrations for each time (Gomes et al 2009;Vieira et al 2012). …”

“…The magnitude of these greenhouse gas fluxes and the main soil and climatic factors that influence natural austral ecosystems in melting areas, as the maritime Antarctica, came to be evaluated only from the last decade, and these studies are still scarce (Sun et al 2002;Vieira et al 2012). The study of the flux rates of N 2 O and CH 4 in these environments has extreme importance since these two gases have a greater warming potential than CO 2 : 25 times greater for CH 4 and 298 times higher for N 2 O (Metz et al 2007).…”

Soil Chemical Attributes as Affected by Vegetal Cover and Seabirds in Punta Hennequin, Antarctica

“…In ice-free regions of maritime Antarctica, such interaction is usually in uenced by the presence of seabird colonies and by the heterogeneity of soil parent material (Navas et al, 2008;Simas et al, 2008), resulting in complex systems that are not fully understood (Ugolini & Bockheim, 2008;Vieira et al, 2012). For this reason, the purpose of the study was to evaluate the e ect of soil cover by vegetation on the changes of soil chemical attributes in a skua eld at Punta Hennequin, Shetland Island, Antarctica.…”