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- Luyssaert, S., et al.
(författare)
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CO2 balance of boreal, temperate, and tropical forests derived from a global database
- 2007
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Ingår i: Global Change Biology. - : Wiley. - 1354-1013 .- 1365-2486. ; 13:12, s. 2509-2537
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Forskningsöversikt (refereegranskat)abstract
- Terrestrial ecosystems sequester 2.1 Pg of atmospheric carbon annually. A large amount of the terrestrial sink is realized by forests. However, considerable uncertainties remain regarding the fate of this carbon over both short and long timescales. Relevant data to address these uncertainties are being collected at many sites around the world, but syntheses of these data are still sparse. To facilitate future synthesis activities, we have assembled a comprehensive global database for forest ecosystems, which includes carbon budget variables (fluxes and stocks), ecosystem traits (e.g. leaf area index, age), as well as ancillary site information such as management regime, climate, and soil characteristics. This publicly available database can be used to quantify global, regional or biome-specific carbon budgets; to re-examine established relationships; to test emerging hypotheses about ecosystem functioning [e.g. a constant net ecosystem production (NEP) to gross primary production (GPP) ratio]; and as benchmarks for model evaluations. In this paper, we present the first analysis of this database. We discuss the climatic influences on GPP, net primary production (NPP) and NEP and present the CO2 balances for boreal, temperate, and tropical forest biomes based on micrometeorological, ecophysiological, and biometric flux and inventory estimates. Globally, GPP of forests benefited from higher temperatures and precipitation whereas NPP saturated above either a threshold of 1500 mm precipitation or a mean annual temperature of 10 degrees C. The global pattern in NEP was insensitive to climate and is hypothesized to be mainly determined by nonclimatic conditions such as successional stage, management, site history, and site disturbance. In all biomes, closing the CO2 balance required the introduction of substantial biome-specific closure terms. Nonclosure was taken as an indication that respiratory processes, advection, and non-CO2 carbon fluxes are not presently being adequately accounted for.
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| 3. |
- McKibben, Jodi B. A., et al.
(författare)
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Epidemiology of burn injuries II : Psychiatric and behavioral perspectives
- 2009
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Ingår i: International Review of Psychiatry. - : Informa UK Limited. - 0954-0261 .- 1369-1627. ; 21:6, s. 512-521
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Tidskriftsartikel (refereegranskat)abstract
- Modern technological advances have decreased the incidence and severity of burn injuries, and medical care improvements of burn injuries have significantly increased survival rates, particularly in developed countries. Still, fire-related burn injuries are responsible for 300,000 deaths and 10 million disability-adjusted life years lost annually worldwide. The extent to which psychiatric and behavioural factors contribute to the incidence and outcomes of these tragedies has not been systematically documented, and the available data is often insufficient to reach definitive conclusions. Accordingly, this article reviews the evidence of psychiatric and behavioural risk factors and prevention opportunities for burn injuries worldwide. Psychiatric prevalence rates and risk factors for burn injuries, prevalence and risks associated with 'intentional' burn injuries (self-immolation, assault, and child maltreatment), and prevention activities targeting the general population and those with known psychiatric and behavioural risk factors are discussed. These issues are substantially interwoven with many co-occurring risk factors. While success in teasing apart the roles and contributions of these factors rests upon improving the methodology employed in future research, the nature of this entanglement increases the likelihood that successful interventions in one problem area will reap benefits in others.
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