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- W2102259192 abstract "The Northern Great Plains grasslands respond differently under various climatic conditions; however, there have been no detailed studies investigating the interannual variability in carbon exchange across the entire Northern Great Plains grassland ecosystem. We developed a piecewise regression model to integrate flux tower data with remotely sensed data and mapped the 8-d and 500-m net ecosystem exchange (NEE) for the years from 2000 to 2006. We studied the interannual variability of NEE, characterized the interannual NEE difference in climatically different years, and identified the drought impact on NEE. The results showed that NEE was highly variable in space and time across the 7 yr. Specifically, NEE was consistently low (−35 to 322 g C·m−2·yr−1) with an average annual NEE of −2 ± 242 g C·m−2·yr−1 and a cumulative flux of −152 g C·m−2. The Northern Great Plains grassland was a weak source for carbon during 2000–2006 because of frequent droughts, which strongly affected the carbon balance, especially in the Western High Plains and Northwestern Great Plains. Comparison of the NEE map with a drought monitor map confirmed a substantial correlation between drought and carbon dynamics. If drought severity or frequency increases in the future, the Northern Great Plains grasslands may become an even greater carbon source. Los pastizales de las grandes planicies del norte responden de manera diferente bajo diversas condiciones climáticas; sin embargo, no ha habido ningún estudio en detalle que investigue la variabilidad entre años en el intercambio de carbono a través de todo el ecosistema de los pastizales de las grandes planicies del norte. Desarrollamos un modelo de regresión para integrar los datos de la torre de flujo con datos medidos de forma remota y establecer el intercambio de ecosistema neto (NEE) de 8 días y 500-m durante los años del 2000 al 2006. Estudiamos la variabilidad de NEE entre años caracterizando las diferencias climáticas entre años, e identificando el impacto de sequía en NEE. Los resultados mostraron que NEE fue demasiado variable en espacio y tiempo a través de los 7 años. Específicamente, NEE fue constantemente bajo (−35 to 322 g C·m−2·yr−1) con un promedio anual NEE de −2 ± 242 g C·m−2·yr−1 y una variación acumulada de −152 g C·m−2. Los pastizales de las planicies del norte fueron una fuente baja de carbono durante los años 2000–2006 debido a las sequías frecuentes, que afectan considerablemente el equilibrio de carbono, especialmente en la parte occidental de las altas planicies y en el noroeste de las grandes planicies. Comparación del registro de NEE con un mapa de monitoreo de la sequía confirmó una sustancial correlación entre la sequía y la dinámica del carbono. Si la gravedad o frecuencia de la sequía es aumenta en el futuro, los pastizales de las grandes planicies del norte pueden convertirse en una fuente de carbono aún mayor." @default.
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- W2102259192 date "2010-01-01" @default.
- W2102259192 modified "2023-09-26" @default.
- W2102259192 title "Climate-Driven Interannual Variability in Net Ecosystem Exchange in the Northern Great Plains Grasslands" @default.
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- W2102259192 doi "https://doi.org/10.2111/08-232.1" @default.
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