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In each plot, we measured the variables that might explain the spatial variation of Rs: these variables include (1) Rs; (2) biotic factors measured by aboveground biomass (AGB), leaf area index (LAI), and canopy chlorophyll content (Chlcanopy); (3) environmental factors encompassing soil water content at 0–20 cm depth (SWC20) and soil temperature at 10 cm depth (Ts10); (4) soil property factors, including soil total nitrogen (STN) content, soil total carbon (STC) content, soil carbon/nitrogen (C/N), and soil organic carbon (SOC) content; and (5) canopy spectral reflectance of winter wheat and summer maize.
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