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Grassland and cropland net ecosystem production of the U.S. Great Plains: Regression tree model development and comparative analysis

November 21, 2016

This paper presents the methodology and results of two ecological-based net ecosystem production (NEP) regression tree models capable of up scaling measurements made at various flux tower sites throughout the U.S. Great Plains. Separate grassland and cropland NEP regression tree models were trained using various remote sensing data and other biogeophysical data, along with 15 flux towers contributing to the grassland model and 15 flux towers for the cropland model. The models yielded weekly mean daily grassland and cropland NEP maps of the U.S. Great Plains at 250 m resolution for 2000–2008. The grassland and cropland NEP maps were spatially summarized and statistically compared. The results of this study indicate that grassland and cropland ecosystems generally performed as weak net carbon (C) sinks, absorbing more C from the atmosphere than they released from 2000 to 2008. Grasslands demonstrated higher carbon sink potential (139 g C·m−2·year−1) than non-irrigated croplands. A closer look into the weekly time series reveals the C fluctuation through time and space for each land cover type.

Citation Information

Publication Year 2016
Title Grassland and cropland net ecosystem production of the U.S. Great Plains: Regression tree model development and comparative analysis
DOI 10.3390/rs8110944
Authors Bruce K. Wylie, Daniel Howard, Devendra Dahal, Tagir Gilmanov, Lei Ji, Li Zhang, Kelcy Smith
Publication Type Article
Publication Subtype Journal Article
Series Title Remote Sensing
Index ID 70178474
Record Source USGS Publications Warehouse
USGS Organization Earth Resources Observation and Science (EROS) Center

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