Net carbon exchange and evapotranspiration in postfire and intact sagebrush communities in the Great Basin

Oecologia
Margaret R PraterEvan H DeLucia

Abstract

Invasion of non-native annuals across the Intermountain West is causing a widespread transition from perennial sagebrush communities to fire-prone annual herbaceous communities and grasslands. To determine how this invasion affects ecosystem function, carbon and water fluxes were quantified in three, paired sagebrush and adjacent postfire communities in the northern Great Basin using a 1-m3 gas exchange chamber. Most of the plant cover in the postfire communities was invasive species including Bromus tectorum L., Agropyron cristatum (L.) Gaertn and Sisymbrium altissimum L. Instantaneous morning net carbon exchange (NCE) and evapotranspiration (ET) in native shrub plots were greater than either intershrub or postfire plots. Native sagebrush communities were net carbon sinks (mean NCE 0.2-4.3 micromol m-2 s-1) throughout the growing season. The magnitude and seasonal variation of NCE in the postfire communities were controlled by the dominant species and availability of soil moisture. Net C exchange in postfire communities dominated by perennial bunchgrasses was similar to sagebrush. However, communities dominated by annuals (cheatgrass and mustard) had significantly lower NCE than sagebrush and became net sources of carbon to th...Continue Reading

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Citations

Jul 7, 2009·Trends in Ecology & Evolution·Liba Pejchar, Harold A Mooney
Mar 19, 2013·Global Change Biology·Jennifer K BalchJosé Gómez-Dans
Mar 27, 2013·Global Change Biology·Elizabeth A Leger
Dec 28, 2017·Ecological Applications : a Publication of the Ecological Society of America·Nuria Gomez-CasanovasEvan H DeLucia
Jun 22, 2019·Scientific Reports·Daniel P BeverlyBrent E Ewers
May 2, 2017·Frontiers in Plant Science·Rebecca A SlatteryDonald R Ort

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