Modeling Carbon Fluxes Using Multi-Temporal MODIS Imagery and CO2 Eddy Flux Tower Data in Zoige Alpine Wetland, South-West China
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An accurate and synoptic quantification of gross primary production (GPP) in wetland ecosystems is essential for assessing carbon budgets at regional or global scales. In this study, a satellite-based Vegetation Photosynthesis Model (VPM) integrated with observed eddy tower and remote sensing data was employed and adapted to evaluate the feasibility and dependability of the model for estimating GPP in an alpine wetland, located in Zoige, Southwestern China. Eddy flux data from 2-year observations showed that temperature explained most of the seasonal variability in carbon fluxes and that warming increased GPP and ecosystem respiration, and hence affected the carbon balance of alpine wetlands. The comparison between modeled and observed GPP fluxes indicated that simulated values were largely in agreement with tower-based values (P < 0.0001). 12-year long-term simulations (2000–2011) found that (1) there was significantly increasing trends at rate of 17.01 gCm−2 year−1 for annual GPP (R 2 = 0.62, P = 0.002); (2) the inter-annual variation in GPP was highly sensitive to climate warming; and (3) a warmer climate can prolong the plant growing season and, by that, increase wetland productivity. Our results demonstrated that the satellite-driven VPM model has the potential to be applied at large spatial and temporal scales for scaling-up carbon fluxes of alpine wetlands.
KeywordsClimate change Remote sensing Model Eddy covariance Qinghai-Tibetan Plateau Wetland
This study was supported by Forestry Nonprofit Industry Scientific Research Special Project (No. 201204201), the National Science and Technology Support Program of China (2012BAC19B04), the National Youth Science Foundation of China (Grant No. 31300417), the National Natural Science Foundation of China (Grant No. 31170459), the research program ‘Climate Change: Carbon Budget and Relevant Issues’ of the Chinese Academy of Sciences (Grant No. XDA05050402) and the National Natural Science Foundation of China (No.50239020). X. Xiao was supported by a research gran from the NASA Earth Observing System (EOS) Data Analysis Program (NNX09AE93G). We thank the principal investigators of the MODIS data products as well as the Oak Ridge National Laboratory’s (ORNL) Distributed Active Archive Center (DAAC) and the Earth Observing System (EOS) Data Gateway for making these MODIS products available. We thank two anonymous reviewers for their valuable comments and suggestions on an earlier version of the manuscript.
- Chen J, Saunders S, Brosofske K, Crow T (2006) Ecology of hierarchical landscapes: from theory to application. Nova Science Publisher, New YorkGoogle Scholar
- Hao YB, Cui XY, Wang YF et al (2011) Predominance of precipitation and temperature controls on ecosystem CO2 exchange in Zoige alpine wetlands of Southwest China. Wetlands 31:413–422Google Scholar
- Inglett KS, Inglett PW, Reddy KR, Osborne TZ (2012) Temperature sensitivity of greenhouse gas production in wetland soils of different vegetation. Biogeochemistry 108:77–90Google Scholar
- Matías L, Castro J, Zamora R (2012) Effect of simulated climate change on soil respiration in a Mediterranean-type ecosystem: rainfall and habitat type are more important than temperature or the soil carbon pool. Ecosystems 15:299–1310Google Scholar
- Mitsch WJ, Bernal B, Nahlik AM et al (2012) Wetlands, carbon, and climate change. Landscape Ecology 28:583–597Google Scholar
- Tagesson T, Mastepanov M, Tamstorf MP et al (2012) High-resolution satellite data reveal an increase in peak growing season gross primary production in a high-Arctic wet tundra ecosystem 1992–2008. International Journal of Applied Earth Observation and Geoinformation 18:407–416CrossRefGoogle Scholar
- Tian Y (2005) The type and distribution of vegetation under different environment in Zoige Alpine wetland. Journal of Yangtze University (Nature Science Edition) 25:1–5Google Scholar
- Wu N (1997) Indigenous knowledge and sustainable approaches for the maintenance of biodiversity in nomadic society. Experiences from the Eastern Tibetan Plateau. Erde-Berlin 128:67–80Google Scholar