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首页> 外文学位 >Soil carbon dioxide and nitrous oxide emissions from an agricultural watershed as influenced by landscape position and agroforestry conservation management practices.
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Soil carbon dioxide and nitrous oxide emissions from an agricultural watershed as influenced by landscape position and agroforestry conservation management practices.

机译：受景观位置和农林业保护管理实践影响的农业流域的土壤二氧化碳和一氧化二氮排放量。

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Atmospheric concentrations of greenhouse gases, such as carbon dioxide (CO2) and nitrous oxide (N2O), have increased over the past two centuries. One major source of greenhouse gas emissions is agricultural soils. However, the effects of contour grass strips and contour grass-tree strips, on greenhouse gas emissions have not been extensively studied. The objective of this study was to determine the effects of landscape position and grass and grass-tree contour strips, on the efflux of soil CO2 and N2O across three agricultural watersheds in northeast Missouri. The three watersheds were in a corn-soybean rotation, and contained one of three management systems: (1) cropped only, (2) cropped with grass contour strips, or (3) cropped with grass-tree contour strips. Surface measurements of the two gases were collected during the 2004 growing season at three landscape positions. The N2O production from the cropped watershed (1.9 g N2O-N m-2) was 2.3 and 3.8 times greater than the agroforestry and grass watersheds, respectively. Across all three watersheds, the soil N2O production was lowest in the lower backslope position (0.7 g N2O-N m-2 ). Soil CO 2 production was lowest in the cropped watershed (0.9 kg CO2-C m-2) compared to the agroforestry (1.5 kg CO2-C m-2) and grass watersheds (1.5 kg CO2-C m -2). The lower backslope position (1.6 kg CO2-C m -2) across all three watersheds produced greater soil CO2 than the upper and middle backslope positions. The results of this study indicate that conservation management practices and landscape position have an effect on the soil surface efflux rates of CO2 and N2O. Permanent vegetative contour strips in an agricultural watershed may help mitigate the increasing levels of tropospheric CO2 and N2O.
机译：在过去的两个世纪中，诸如二氧化碳（CO2）和一氧化二氮（N2O）等温室气体的大气浓度有所增加。农业土壤是温室气体排放的主要来源之一。然而，尚未广泛研究等高草带和等高草木带对温室气体排放的影响。这项研究的目的是确定景观位置，草和草树等高线带对密苏里州东北部三个农业流域的土壤CO2和N2O外流的影响。这三个流域是玉米-大豆轮作，并包含以下三个管理系统之一：（1）仅种植，（2）用草形轮廓带种植，或（3）用草木形轮廓带种植。在2004年生长季节期间，在三个景观位置收集了两种气体的表面测量值。种植流域的N2O产量（1.9 g N2O-N m-2）分别比农林和草木流域高2.3倍和3.8倍。在所有三个流域中，土壤N2O产量在较低的后坡位置最低（0.7 g N2O-N m-2）。与农林业（1.5 kg CO2-C m-2）和草木流域（1.5 kg CO2-C m -2）相比，种植流域（0.9 kg CO2-C m-2）的土壤CO 2产量最低。在所有三个流域中，较低的后坡位置（1.6 kg CO2-C m -2）产生的土壤CO2比上方和中坡位置大。这项研究的结果表明，保护管理措施和景观位置对土壤表面CO2和N2O外排率有影响。农业流域中的永久性植物轮廓带可能有助于减轻对流层CO2和N2O含量的增加。

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