Carbon sequestration potential of second-growth forest regeneration in the Latin American tropics

Regrowth of tropical secondary forests following complete or nearly complete removal of forest vegetation actively stores carbon in aboveground biomass, partially counterbalancing carbon emissions from deforestation, forest degradation, burning of fossil fuels, and other anthropogenic sources. We estimate the age and spatial extent of lowland second-growth forests in the Latin American tropics and model their potential aboveground carbon accumulation over four decades. Our model shows that, in 2008, second-growth forests (1 to 60 years old) covered 2.4 million km2 of land (28.1%of the total study area).Over 40 years, these lands can potentially accumulate a total aboveground carbon stock of 8.48 Pg C (petagrams of carbon) in aboveground biomass via low-cost natural regeneration or assisted regeneration, corresponding to a total CO2 sequestration of 31.09 Pg CO2. This total is equivalent to carbon emissions from fossil fuel use and industrial processes in all of Latin America and the Caribbean from1993 to 2014. Ten countries account for 95% of this carbon storage potential, led by Brazil, Colombia, Mexico, and Venezuela. We model future land-use scenarios to guide national carbon mitigation policies. Permitting natural regeneration on 40% of lowland pastures potentially stores an additional 2.0 Pg C over 40 years. Our study provides information and maps to guide national-level forest-based carbon mitigation plans on the basis of estimated rates of natural regeneration and pasture abandonment. Coupled with avoided deforestation and sustainable forestmanagement, natural regeneration of second-growth forests provides a low-costmechanism that yields a high carbon sequestration potential with multiple benefits for biodiversity and ecosystem services. © 2016 The Authors

Mental Health and Employment: Personal perspectives

Policy makers, service agencies and people with mental illness themselves view employment for people with mental illness as a major concern. This is due to the low rate of employment of people with mental illness, the difficulties many experience in finding and keeping satisfactory jobs, and the perception of paid employment as highly desirable for people with mental illness. The most extensive research on employment for people with mental illness has focused on establishing statistical relationships between various hypothesised predictors of employment success and vocational outcomes. While some attention has been paid to how individuals with mental illness view being employed, this has primarily focused on specific areas such as the benefits of employment, difficulties encountered and coping techniques used. My aim in this research was to develop a theoretical formulation which explains the processes that people with mental illness engage in with regard to employment. Data was gathered by way of in-depth interviews with users of psychiatric services. Some of these participants were employed, others were seeking employment, while others were not engaged in employment-related activities. At the centre of the theoretical formulation is a process I have called negotiating an appropriate vocational place. Using this process, people with mental illness make decisions about actions to take in relation to employment and these may or may not include trying to get and keep a job. Decisions are made by weighing up the benefits and drawbacks of employment and the advantages and risks of different vocational strategies. In doing so, people with mental illness are influenced by the Australian societal context, their individual social networks, their individual characteristics and circumstances (including their mental illness), and their employment options. This process of negotiating an appropriate vocational place is cyclical, ongoing and dynamic, as individuals' views and circumstances change. Knowing that people with mental illness strive toward an appropriate vocational place rather than taking for granted that they are working towards getting a job presents a challenge to policy and practice in which a successful outcome is defined as obtaining and maintaining a paid position in the workforce. Detailing and elaborating the process by which people with mental illness go about negotiating an appropriate vocational place provides a framework for practitioners, policy makers and researchers to understand the decisions made by people with mental illness and their actions in relation to employment. The understanding provided by the findings from this study will assist those working with people with mental illness and those responsible for employment policies to tailor their work more closely to individuals' desired goals. Immediate and longer term research opportunities are identified to apply the theoretical formulation derived from this study to vocational service practice with people with mental illness

Biomass resilience of Neotropical secondary forests

Land-use change occurs nowhere more rapidly than in the tropics, where the imbalance between deforestation and forest regrowth has large consequences for the global carbon cycle. However, considerable uncertainty remains about the rate of biomass recovery in secondary forests, and how these rates are influenced by climate, landscape, and prior land use. Here we analyse aboveground biomass recovery during secondary succession in 45 forest sites and about 1,500 forest plots covering the major environmental gradients in the Neotropics. The studied secondary forests are highly productive and resilient. Aboveground biomass recovery after 20 years was on average 122 megagrams per hectare (Mg ha-1), corresponding to a net carbon uptake of 3.05 Mg C ha 1 yr-1, 11 times the uptake rate of old-growth forests. Aboveground biomass stocks took a median time of 66 years to recover to 90% of old-growth values. Aboveground biomass recovery after 20 years varied 11.3-fold (from 20 to 225 Mg ha-1) across sites, and this recovery increased with water availability (higher local rainfall and lower climatic water deficit). We present a biomass recovery map of Latin America, which illustrates geographical and climatic variation in carbon sequestration potential during forest regrowth. The map will support policies to minimize forest loss in areas where biomass resilience is naturally low (such as seasonally dry forest regions) and promote forest regeneration and restoration in humid tropical lowland areas with high biomass resilience. © 2016 Macmillan Publishers Limited. All rights reserved