Carbon balance of a tropical savanna of northern Australia

Chen, Xiaoyong; Hutley, Lindsay B.; Eamus, Derek

doi:10.1007/s00442-003-1358-5

Cited by 168 publications

(164 citation statements)

References 49 publications

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“…However, such estimate was higher than that obtained for a similar forest in the Hunan province (3.96 t C ha -1 y -1 -Xiao et al 2010), as well as for an open eucalypt savanna in northern Australia (3.8 t C ha -1 y -1 - Chen et al 2003). Contrastingly, annual NEP estimated in this study was lower than that reported for a European temperate deciduous forest (5.9 t C ha -1 y -1 - Malhi et al 1999) and a natural evergreen forest of Castanopsis kawakamii (7.5 t C ha -1 y -1…”

Section: Carbon Balancementioning

confidence: 61%

Soil respiration and carbon balance in a Moso bamboo (Phyllostachys heterocycla (Carr.) Mitford cv. Pubescens) forest in subtropical China

Tang¹,

Fan²,

Qi³

et al. 2015

iForest

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© iForest -Biogeosciences and Forestry IntroductionForest ecosystems can be carbon sinks or sources depending on the balance between carbon input through photosynthesis and release from respiration (Saiz et al. 2006). In forest ecosystems, soil respiration (RS) can account for 30% to 80% of the whole ecosystem respiration (Davidson et al. 2000, Law et al. 2002, Davidson & Janssens 2006. Globally, RS is the second largest carbon exchange between the soil and atmosphere, and returns as much as 80 to 98 Pg C yr -1 back into the atmosphere (BondLamberty & Thomson 2010, Raich et al. 2002, which is more than 10 times the carbon release from fossil fuel combustion (IPCC 2007). Therefore, RS is one of the major contributors to the carbon balance, and small changes in RS rate could give rise to significant changes in atmospheric CO2 concentration, leading to feedbacks to climate change (Ryan & Law 2005). Although the significance of RS for carbon balance on a regional and even the global scale has been demonstrated, there is still much to understand about biotic or abiotic controllers of RS and its source components (Gomez-Casanovas et al. 2012). For example, partitioning RS is still challenging because of remarkable soil disturbances (Hanson et al. 2000, Tang et al. 2005. Spatial and temporal variability in RS are often reported due to high variations in forest types, stand ages and management practices (King et al. 2004, Tang & Baldocchi 2005, Saiz et al. 2006, Pang et al. 2013). This has limited our ability to accurately predict the responses of RS and carbon balance to current and future climate change (Ryan & Law 2005). Therefore, measuring RS in different forest types has been proven to be increasingly important to accurately predict global carbon cycles and its responses to climate change .RS is overwhelmingly comprised of rhizoshperic respiration (respiration from roots, mycorrhizae and microbial respiration in the rhizosphere) and heterotrophic respiration , indicating that the Moso bamboo forest studied is a significant carbon sink.

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Section: Carbon Balancementioning

confidence: 61%

Soil respiration and carbon balance in a Moso bamboo (Phyllostachys heterocycla (Carr.) Mitford cv. Pubescens) forest in subtropical China

Tang¹,

Fan²,

Qi³

et al. 2015

iForest

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“…) [64], while in South and Central America, the highest biomass values recorded have been observed in Brazilian cerrado vegetation (~31.8 tha −1 ) [65]. This leads to the suggestion that the pantropical carbon maps may be overestimating AGWB in savanna areas, and this suggestion will need to be explored more rigorously as more field-based estimates of biomass are collated from other savanna woodlands.…”

Section: Figurementioning

confidence: 99%

Local-Scale Mapping of Biomass in Tropical Lowland Pine Savannas Using ALOS PALSAR

Michelakis

Stuart

Lopez

et al. 2014

Forests

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Fine-scale biomass maps offer forest managers the prospect of more detailed and locally accurate information for measuring, reporting and verification activities in contexts, such as sustainable forest management, carbon stock assessments and ecological studies of forest growth and change. In this study, we apply a locally validated method for estimating aboveground woody biomass (AGWB) from Advanced Land Observing Satellite (ALOS) Phased Array-type L-band Synthetic Aperture Radar (PALSAR) data to produce an AGWB map for the lowland pine savannas of Belize at a spatial resolution of 100 m. Over 90% of these woodlands are predicted to have an AGWB below 60 tha −1 , with the average woody biomass of these savannas estimated at 23.5 tha −1 . By overlaying these spatial estimates upon previous thematic mapping of national land cover, we derive representative average biomass values of ~32 tha −1 and ~18 tha −1 for the previously qualitative classes of "denser" and "less dense" tree savannas. The predicted average biomass, from the mapping for savannas woodlands occurring within two of Belize's larger protected areas, agree closely with previous biomass estimates for these areas based on ground surveys and forest inventories (error ≤20%). However, biomass estimates derived for these protected areas from two biomass maps produced at coarser resolutions (500 m and 1000 m) from global datasets overestimated biomass (errors ≥275% in each dataset). OPEN ACCESSForests 2014, 5 2378The finer scale biomass mapping of both protected and unprotected areas provides evidence to suggest that protection has a positive effect upon woody biomass, with the mean AGWB higher in areas protected and managed for biodiversity (protected and passively managed (PRPM), 29.5 tha −1 ) compared to unprotected areas (UPR, 23.29 tha −1 ).These findings suggest that where sufficient ground data exists to build a reliable local relationship to radar backscatter, the more detailed biomass mapping that can be produced from ALOS and similar satellite data at resolutions of ~100 m provides more accurate and spatially detailed information that is more appropriate for supporting the management of forested areas of ~10,000 ha than biomass maps that can be produced from lower resolution, but freely available global data sets.

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“…Chen et al 2003;Williams et al 2004Williams et al , 2005 suggest that for the Eucalyptus miniata-tetrodonta savannas, which are very extensive in the higher rainfall areas of Northern Australia, more carbon is sequestered than lost back to the atmosphere, with this amount increasing when fires are less frequent, intense or extensive. That is, these savannas are carbon sinks.…”

Section: Living In the Landmentioning

confidence: 99%

The Nature of Northern Australia: its natural values, ecological processes and future prospects

Woinarski¹,

Mackey²,

Nix³

et al. 2007

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Carbon balance of a tropical savanna of northern Australia

Cited by 168 publications

References 49 publications

Soil respiration and carbon balance in a Moso bamboo (Phyllostachys heterocycla (Carr.) Mitford cv. Pubescens) forest in subtropical China

Soil respiration and carbon balance in a Moso bamboo (Phyllostachys heterocycla (Carr.) Mitford cv. Pubescens) forest in subtropical China

Local-Scale Mapping of Biomass in Tropical Lowland Pine Savannas Using ALOS PALSAR

The Nature of Northern Australia: its natural values, ecological processes and future prospects

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