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Carbon dioxide and water vapor fluxes in winter wheat and tallgrass prairie in central Oklahoma

机译:俄克拉荷马州中部的冬小麦和草丛草原中的二氧化碳和水蒸气通量

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Winter wheat (Triticum aestivum L.) and tallgrass prairie are common land cover types in the Southern Plains of the United States. During the last century, agricultural expansion into native grasslands was extensive, particularly managed pasture or winter wheat. In this study, we measured carbon dioxide (CO2) and water vapor (H2O) fluxes from winter wheat and tallgrass prairie sites in Central Oklahoma using the eddy covariance in 2015 and 2016. The objective of this study was to contrast CO2 and H2O fluxes between these two ecosystems to provide insights on the impacts of conversion of tallgrass prairie to winter wheat on carbon and water budgets. Daily net ecosystem CO2 exchange (NEE) reached seasonal peaks of -9.4 and -8.8 g Cm-2 in 2015 and -6.2 and -7.5 g Cm-2 in 2016 at winter wheat and tall grass prairie sites, respectively. Both sites were net sink of carbon during their growing seasons. At the annual scale, the winter wheat site was a net source of carbon (56 +/- 13 and 33 +/- 9 g Cm-2 year(-1) in 2015 and 2016, respectively). In contrast, the tallgrass prairie site was a net sink of carbon (-128 +/- 69 and -119 +/- 53 g Cm-2 year(-1) in 2015 and 2016, respectively). Daily ET reached seasonal maximums of 6.0 and 5.3 mmday(-1) in 2015, and 7.2 and 8.2 mmday(-1) in 2016 at the winter wheat and tallgrass prairie sites, respectively. Although ecosystem water use efficiency (EWUE) was higher in winter wheat than in tallgrass prairie at the seasonal scale, summer fallow contributed higher water loss from the wheat site per unit of carbon fixed, resulting into lower EWUE at the annual scale. Results indicate that the differences in magnitudes and patterns of fluxes between the two ecosystems can influence carbon and water budgets. (C) 2018 Elsevier B.V. All rights reserved.
机译:冬小麦(Triticum aestivum L.)和高草草原是美国南部平原的常见土地覆盖类型。在上个世纪,农业向原生草原的扩张非常广泛,特别是管理牧场或冬小麦。在这项研究中,我们使用2015年和2016年的涡度协方差测量了俄克拉荷马州中部的冬小麦和高草草原地区的二氧化碳(CO2)和水蒸气(H2O)通量。本研究的目的是对比两个州之间的CO2和H2O通量这两个生态系统提供了关于高草草原向冬小麦转化对碳和水预算影响的见解。冬小麦和高草草原地区的每日净生态系统二氧化碳交换量(NEE)分别在2015年和-2016年分别达到-9.4和-8.8 g Cm-2和-6.2和-7.5 g Cm-2的季节高峰。这两个地点在其生长季节中都是净碳汇。在年度规模上,冬小麦站点是碳的净来源(2015年和2016年分别为56 +/- 13和33 +/- 9 g Cm-2年(-1))。相比之下,高草草原站点是一个净碳汇(2015年和2016年分别为-128 +/- 69和-119 +/- 53 g Cm-2年(-1))。在冬小麦和高草草原地区,2015年的每日ET分别达到6.0和5.3 mmday(-1)的季节性最大值,并在2016年达到7.2 mm8.2(-1)和8.2 mmday(-1)的季节最大值。尽管在季节尺度上,冬小麦的生态系统水分利用效率(EWUE)高于高草草原,但夏季休耕导致单位碳固定单位下小麦产地的水分损失较高,从而导致年度尺度下的EWUE较低。结果表明,两个生态系统之间通量的大小和模式的差异会影响碳和水的预算。 (C)2018 Elsevier B.V.保留所有权利。

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