Carbon Storage in Terrestrial Ecosystems

Scholes, Robert J.; Smart, Kathleen

doi:10.1016/b978-0-12-384703-4.00411-1

Cited by 2 publications

(1 citation statement)

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“…Terrestrial ecosystems play a pivotal role in providing regulating ecosystem services related to global and climate change [ 1 ]. Photosynthesis and respiration processes of vegetation are the direct link between biosphere and atmosphere, stressing terrestrial ecosystems’ importance in the global carbon cycle [ 2 ].…”

Section: Introductionmentioning

confidence: 99%

Landsat phenological metrics and their relation to aboveground carbon in the Brazilian Savanna

Schwieder

Leitão

Pinto

et al. 2018

Carbon Balance Manage

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BackgroundThe quantification and spatially explicit mapping of carbon stocks in terrestrial ecosystems is important to better understand the global carbon cycle and to monitor and report change processes, especially in the context of international policy mechanisms such as REDD+ or the implementation of Nationally Determined Contributions (NDCs) and the UN Sustainable Development Goals (SDGs). Especially in heterogeneous ecosystems, such as Savannas, accurate carbon quantifications are still lacking, where highly variable vegetation densities occur and a strong seasonality hinders consistent data acquisition. In order to account for these challenges we analyzed the potential of land surface phenological metrics derived from gap-filled 8-day Landsat time series for carbon mapping. We selected three areas located in different subregions in the central Brazil region, which is a prominent example of a Savanna with significant carbon stocks that has been undergoing extensive land cover conversions. Here phenological metrics from the season 2014/2015 were combined with aboveground carbon field samples of cerrado sensu stricto vegetation using Random Forest regression models to map the regional carbon distribution and to analyze the relation between phenological metrics and aboveground carbon.ResultsThe gap filling approach enabled to accurately approximate the original Landsat ETM+ and OLI EVI values and the subsequent derivation of annual phenological metrics. Random Forest model performances varied between the three study areas with RMSE values of 1.64 t/ha (mean relative RMSE 30%), 2.35 t/ha (46%) and 2.18 t/ha (45%). Comparable relationships between remote sensing based land surface phenological metrics and aboveground carbon were observed in all study areas. Aboveground carbon distributions could be mapped and revealed comprehensible spatial patterns.ConclusionPhenological metrics were derived from 8-day Landsat time series with a spatial resolution that is sufficient to capture gradual changes in carbon stocks of heterogeneous Savanna ecosystems. These metrics revealed the relationship between aboveground carbon and the phenology of the observed vegetation. Our results suggest that metrics relating to the seasonal minimum and maximum values were the most influential variables and bear potential to improve spatially explicit mapping approaches in heterogeneous ecosystems, where both spatial and temporal resolutions are critical.Electronic supplementary materialThe online version of this article (10.1186/s13021-018-0097-1) contains supplementary material, which is available to authorized users.

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Section: Introductionmentioning

confidence: 99%