scholarly journals Modeling Deforestation and CO2 Emissions in Tropical Forests (Western South Amazon)

2018 ◽  
Author(s):  
Valderli Jorge Piontekowski ◽  
Ângela Pereira Bussinguer ◽  
Fabiana Piontekowski Ribeiro ◽  
Jonas Inkotte ◽  
Karla Monique Silva Carneiro Valadão ◽  
...  
Keyword(s):  
Co2 Emissions ◽  
Tropical Forests

scholarly journals Assessing Land Cover Changes and CO2 Emissions in Tropical Forests, 1998-2016: A Case Study of the Sungai Wain Protection Forest

2019 ◽  
Vol 28 (5) ◽  
pp. 3597-3604
Author(s):  
Askar Askar ◽  
Narissara Nuthammachot ◽  
Tri Sayektiningsih ◽  
Hermudananto Hermudananto
Keyword(s):  
Land Cover ◽  
Co2 Emissions ◽  
Tropical Forests ◽  
Land Cover Changes ◽  
Protection Forest

scholarly journals Large contribution of recent photosynthate to soil respiration in Dipterocarpaceae-dominated tropical forest revealed by girdling

2020 ◽  
Author(s):  
Andrew Nottingham ◽  
Alexander W. Cheesman ◽  
Terhi Ruitta ◽  
Christopher E. Doughty ◽  
elizabeth telford ◽  
...  
Keyword(s):  
Species Composition ◽  
Tropical Forest ◽  
Co2 Emissions ◽  
Tropical Forests ◽  
Co2 Efflux ◽  
Soil Co2 ◽  
Rhizosphere Respiration ◽  
Carbon Transfer ◽  
Soil Co2 Emissions ◽  
Belowground Carbon

•Tropical forests are the most productive terrestrial ecosystem, fixing around 41 Pg of carbon from the atmosphere each year. A substantial portion of this carbon is allocated belowground to roots and root-associated microorganisms. However, there have been very few empirical studies on the dynamics of this transfer, especially in tropical forests where the response is mediated by high plant diversity.•We used a large-scale girdling experiment to halt the belowground transfer of recent photosynthates in a lowland tropical forest in Borneo. By girdling 209 large trees in a 0.48 ha plot, we determined: i) the contribution of recent photosynthate to root-rhizosphere respiration and; ii) the relationships among the disruption of this belowground carbon supply, tree species composition and mortality.•Soil CO2 emissions declined markedly (36 ± 5%) over ~50 days following girdling in three of six monitored subplots. In the other three subplots there was either a marginal decline or no response of soil CO2 emissions to girdling. The decrease in soil CO2 efflux was higher in subplots with greater dominance of Dipterocarpaceae.•Mortality of the 209 trees was 62% after 370 days, with large variation among species. There was particularly high mortality for Dipterocarpaceae species. Whilst species with functional traits associated with faster growth rates (including lower wood density) had a higher risk of mortality post-girdle treatment.•Overall, our results indicate a strong coupling of belowground carbon allocation and root-rhizosphere respiration in this tropical forest but with high spatial variation driven by differences in plant community composition, with a closer above-belowground coupling in forest dominated by Dipterocarpaceae. Our findings highlight the implications of the diverse species composition of tropical forests in affecting the dynamics of belowground carbon transfer and its release to the atmosphere.

Emission of CO2 from tropical riparian forest soil is controlled by soil temperature, soil water content and depth to water table

Soil Research ◽  
2016 ◽  
Vol 54 (3) ◽  
pp. 311 ◽  
Author(s):  
I. Goodrick ◽  
S. Connor ◽  
M. I. Bird ◽  
P. N. Nelson
Keyword(s):  
Soil Temperature ◽  
Water Content ◽  
Soil Water ◽  
Soil Water Content ◽  
Co2 Emissions ◽  
Tropical Forests ◽  
Water Table ◽  
Riparian Forest ◽  
Emission Rates ◽  
Depth To Water Table

Tropical forests play a key role in the global carbon cycle. However, little is known about carbon cycling in the substantial portion of tropical forests that are low-lying, with shallow and fluctuating water tables. This study aimed to determine what factors control emissions of CO2 from soil in a riparian rainforest in Queensland, Australia. Emissions were measured over the course of 1 year, using static chambers. Emission rates were significantly related to soil temperature (0–0.1 m depth), soil water content (0–0.12 m depth) and depth to water table. The most efficient linear model of emissions as a function of measured parameters, which also included soil pH (0–0.1 m depth), had r2 = 0.355. CO2 emissions were highest (5.2–7.5 μmol m–2 s–1) at moderate soil temperature (24−28°C), water table depth (0.2–1.5 m) and soil water-filled porosity (0.25–0.79). They were lowest (<0.5 μmol m–2 s–1) at low soil temperature (<22°C) or when the water table was within 0.15 m of the surface. An additional interaction between temperature and soil water was determined in the laboratory. Incubation of soil cores showed that temperature sensitivity of the heterotrophic component of respiration increased as the soil dried. It is clear that models of soil respiration in lowland tropical forests should take into account depth to water table, which is a key, but hitherto unreported, controller of CO2 emissions in tropical forests.

Tropical Forests

1921 ◽  
Vol 3 (3supp) ◽  
pp. 267-270
Author(s):  
Vernon Kellogg ◽  
R. M. Yerkes ◽  
H. E. Howe
Keyword(s):  
Tropical Forests

Uneven Decoupling

2019 ◽  
Vol 5 (4) ◽  
pp. 410-427 ◽  
Author(s):  
Ryan P. Thombs ◽  
Xiaorui Huang
Keyword(s):  
Economic Growth ◽  
Co2 Emissions ◽  
Ecological Modernization ◽  
Climate Mitigation ◽  
Data Limitations ◽  
Treadmill Of Production ◽  
Global North ◽  
Organization Of Production ◽  
Changes Over Time ◽  
Over Time

The macro-comparative decoupling literature has often sought to test the arguments made by the treadmill of production (TP) and ecological modernization (EM) theories. However, due to data limitations, these studies have been limited to analyzing the years after 1960. Given that both theories discuss historical processes operating before 1960, analyzing pre-1960 data is warranted to more comprehensively test the propositions made by both theories. We assess the long-term relationship between economic growth and CO2 emissions from 1870 to 2014 using a sample of global North nations. We use Prais-Winsten regression models with time interactions to assess whether, when, and how much CO2 emissions have decoupled from economic growth over time. We find that significant relative decoupling has occurred twice since 1870: during the last 30 years of the nineteenth century, the timing of which is contrary to what both the EM and TP theories might expect, and after 1970. We also observe that the relationship remained relatively stable from the turn of the twentieth century to approximately 1970, which aligns with the arguments made by the classical TP work. We conclude that shifts in the global organization of production have shaped the magnitude of the economic growth–CO2 emissions relationship and its changes over time, which has implications for climate mitigation policy.

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