Item talk:Q239772

From geokb

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   "name": "Productivity and CO2 exchange of Great Plains ecoregions. I. Shortgrass steppe: Flux tower estimates",
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   "abstract": "The shortgrass steppe (SGS) occupies the southwestern part of the Great Plains. Half of the land is cultivated, but significant areas remain under natural vegetation. Despite previous studies of the SGS carbon cycle, not all aspects have been completely addressed, including gross productivity, ecosystem respiration, and ecophysiological parameters. Our analysis of 1998\u00a0\u2212\u00a02007 flux tower measurements at five Bowen ratio\u2013energy balance (BREB) and three eddy covariance (EC) sites characterized seasonal and interannual variability of gross photosynthesis\u00a0and ecosystem respiration. Identification of the nonrectangular hyperbolic equation for the diurnal CO2\u00a0exchange, with vapor pressure deficit (VPD) limitation and exponential temperature response, quantified quantum yield\u00a0\u03b1, photosynthetic capacity\u00a0Amax, and respiration rate\u00a0rd\u00a0with variation ranges (19 \\<\u00a0\u03b1\u00a0\\< 51 mmol mol\u2212\u00a01, 0.48 \\<\u00a0Amax\u00a0\\< 2.1 mg CO2\u00a0m\u2212\u00a02\u00a0s\u2212\u00a01, 0.15 \\<\u00a0rd\u00a0\\< 0.49 mg CO2\u00a0m\u2212\u00a02\u00a0s\u2212\u00a01). Gross photosynthesis varied from 1 100 to 2 700 g CO2\u00a0m\u2212\u00a02\u00a0yr\u2212\u00a01, respiration from 900 to 3,000 g CO2\u00a0m\u2212\u00a02\u00a0yr\u2212\u00a01, and net ecosystem production from \u2212\u00a0900 to +\u00a0700 g CO2\u00a0m\u2212\u00a02\u00a0yr\u2212\u00a01, indicating that SGS may switch from a sink to a source depending on weather. Comparison of the 2004\u00a0\u2212\u00a02006 measurements at two BREB and two parallel EC flux towers located at comparable SGS sites showed moderately higher photosynthesis, lower respiration, and higher net production at the BREB than EC sites. However, the difference was not related only to methodologies, as the normalized difference vegetation index at the BREB sites was higher than at the EC sites. Overall magnitudes and seasonal patterns at the BREB and the EC sites during the 3-yr period were similar, with trajectories within the \u00b1 1.5 standard deviation around the mean of the four sites and mostly reflecting the effects of meteorology.",
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