Carbon sequestration potential of tropical pasture compared with afforestation in Panama

摘要: Tropical forest ecosystems play an important role in regulating the global climate, yet deforestation and land-use change mean that tropical carbon sink is increasingly influenced by agroecosystems pastures. Despite this, it not fully understood how cycling tropics responds to change, particularly for pasture afforestation. Thus, objectives of our study were: (1) elucidate environmental controls impact management on gross primary production (GPP), total ecosystem respiration (TER) net CO2 exchange (NEE); (2) estimate sequestration potential compared with afforestation; (3) compare eddy covariance-derived budgets biomass soil inventory data. We performed comparative measurements NEE a C4 adjacent afforestation native tree species Sardinilla (Panama) from 2007 2009. Pronounced seasonal variation GPP, TER were closely related radiation, moisture, C3 vs. plant physiology. The shallow rooting depth grasses trees resulted higher sensitivity water limitation drought. During 2008, substantial amounts sequestered (‐442gCm ‐2 , negative values denote uptake), which was agreement biometric observations (‐450gCm ). In contrast, strong source 2008 2009 (261gCm ), associated drought overgrazing. addition, isotope data indicated rapid turnover after conversion Our results clearly show considerable highlight risk losses climate.