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Oleoresin yield and carbon stocks in tapped subtropical Pinus elliottiiforests
© Rodrigues-Corrêa et al; licensee BioMed Central Ltd. 2011
- Published: 13 September 2011
- Aboveground Biomass
- Carbon Stock
- Mechanical Wound
- Belowground Biomass
- Forest Biomass
Low-cost methods to mitigate the increasing levels of carbon dioxide in the atmosphere and their implications on global climate change have received considerable attention in the last years [1, 2]. Afforestation is an important alternative to reduce the rise in atmospheric CO2 concentration due to the system's ability to fix carbon in forest biomass and soil . Several studies have been performed to estimate carbon sequestration in temperate, tropical, and mediterranean forests ecosystems [4, 5]. However, there are no reports related to carbon balance in pine forests used for oleoresin tapping grown under subtropical climate. The main goal of this research is to estimate the effect of resin tapping on C sequestration by Pinus elliottii forests.
Resin tapping operation
In June 2009, 90 slash pine (Pinus elliottii Engelm.) trees of a 14 year-old forest were selected based on a previously determined DBH interval (between 23.48 ±1.12 and 22.77 ±0.88). Since the beginning of the essay, pine trees have been biweekly stimulated to produce oleoresin . Three treatments were evaluated for pine biomass increase and oleoresin yield: bark streak (mechanical wound), paste (mechanical wound + chemical stimulation) and control (intact trees). At the end of each season, the released oleoresin was collected and weighed in a digital balance. The results shown below were obtained between Spring 2009 and Winter 2010.
Biomass production and carbon accumulation
In November 2010, fifteen pine trees (5 intact tree control, 5 mechanically wounded, and 5 paste stimulated tapped trees) were felled and weighed in the field to estimate the above and belowground total fresh biomass of trees. Sub-samples of each part of trees were collected and dried in an oven at 105°C until reaching constant dry weight. The carbon content per unit dry weight present in the aboveground and belowground biomass was estimated using a carbon content of 50% . Data were analyzed for differences between resin treatments (bark streak vs. paste) by comparison of means by ANOVA and Tukey test (Systat Software Inc., Richmond, CA USA); significance was set at P £0.05).
These results indicate that carbon stored in aboveground biomass appeared to represent the main carbon pool of tree biomass and that resin tapping had minor impact on C allocation in wood biomass, considering the time frame and stand age examined. Further studies and sampling times are ongoing in order to better characterize carbon stocks in subtropical slash pine plantations and to elucidate the contribution of oleoresin production in carbon stocks and its relation with C in wood biomass.
Funding for this investigation was provided by a consortium of forest companies (Trevo Florestal, Irani/Habitasul Florestal, Florestal Palmares) and the Brazilian agencies National Council for Scientific and Technological Development (CNPq), National Committee for Improvement of Higher Level Education Personnel (CAPES) and Rio Grande do Sul State Foundation for Research Support (Fapergs).
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