Abstract
The carbon sequestration capacity of wetland vegetation determines carbon stocks and changes in wetlands. However, modeling vegetation carbon sequestration of herbaceous wetlands is still problematic due to complex hydroecological processes and rapidly changing biomass carbon stocks. Theoretically, a vegetation index (VI) time series can retrieve the dynamic of biomass carbon stocks and could be used to calculate the cumulative composite of biomass carbon stocks during a given interval, i.e., vegetation carbon sequestration. Hence, we explored the potential for mapping vegetation carbon sequestration in herbaceous wetlands in this study by using a combination of remotely sensed VI time series and field observation data. This method was exemplarily applied for Poyang Lake wetland in 2016 by using a 16-day Moderate Resolution Imaging Spectroradiometer (MODIS) enhanced vegetation index (EVI) time series. Results show that the vegetation carbon sequestration in this area was in the range of 193–1221 g C m−2 year−1 with a mean of 401 g C m−2 year−1 and a standard deviation of 172 g C m−2 year−1 in 2016. The approach has wider spatial applicability in wetlands than the currently used global map of vegetation production (MOD17A3) because our carbon estimation in areas depicted by ‘no data’ in the MOD17A3 product is considerable, which accounts for 91.2–91.5% of the total vegetation carbon sequestration of the wetland. Thus, we determined that VI time series data shows great potential for estimating vegetation carbon sequestration in herbaceous wetlands, especially with the continuously improving quality and frequency of satellite VI images.
Highlights
Vegetation carbon sequestration is the amount of carbon that can be sequestered by vegetation during a given interval
The processed and raw enhanced vegetation index (EVI) curves at 60 randomly selected pixels were compared to evaluate the quality of our preprocessed EVI time series
Estimating the large-scale vegetation carbon sequestration in a herbaceous wetland via the satellite data-driven ecophysiological process models is a great challenge because ecophysiological processes in these environments are complex and changeable
Summary
Vegetation carbon sequestration is the amount of carbon that can be sequestered by vegetation during a given interval. Pierfelice et al [6] calculated the monthly fluctuations in biomass carbon stocks at three wetland sites in South Carolina in 2010–2012 to estimate the yearly vegetation carbon sequestration. The eddy covariance technique is widely used on small spatial scales to calculate the levels of vegetation carbon sequestration [9]. It measures the covariance between fluctuations in vertical wind velocity and the CO2 mixing ratio, which produces estimations of RE (ecosystem respiration) and NEE (net ecosystem exchange) and the vegetation carbon sequestration [9]
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