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首页> 外文期刊>International Journal of Plant & Soil Science >Greenhouse Gas Fluxes and Soil Carbon and Nitrogen Following Single Summer Tillage Event
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Greenhouse Gas Fluxes and Soil Carbon and Nitrogen Following Single Summer Tillage Event

机译：一次夏季耕种后的温室气体通量和土壤碳氮

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No-till farming results in gradual buildup of soil organic matter (SOM) and re-introduction of tillage can often reverse it. However, tillage in low precipitation regions may be needed to manage weeds and disperse accumulation of immobile soil nutrients. The main objective of this study was to assess the effects of a single summer tillage on carbon dioxide (CO2), methane (CH4) and nitrous oxide (N2O), soil water filled pore space (WFPS), dissolved organic carbon (DOC) and nitrate (NO3) in winter wheat - summer fallow systems that were either tilled for the first time after nine years of no-till (NTT), not-tilled (no-till, NT) or were frequently tilled (conventional, CT; and organic, CF). The study was established in the US Central High Plains region where annual precipitation averaged 332±39 mm. Soil and gas samples were collected before the tillage event (time zero) and at 1hr, 5 hrs, 25 hrs and 50 hrs after. Immediate increases in CO2 and N2O fluxes were observed in all tilled treatments within the first 1 to 5 hours but 50-hr cumulative N2O and CO2 in NTT did not differ from the values observed in NT. Tillage however, resulted in a 22% greater 50-hr cumulative CH4 assimilation in NTT compared with NT and was comparable with CH4 in CT suggesting enhanced soil aeration. Soil NO3 did not change in NTT unlike in CT and CF and soil DOC did not increase in NTT until 25 hrs after when, it returned to levels comparable with time zero. In contrast, DOC in CT and CF continued to stay elevated after 50 hrs. In conclusion, single tillage event of a long-term no-till performed on dry soil during summer did not negate benefits associated with SOM accrual and may be a viable alternative for farmers to address some of the management-related problems.
机译：免耕农业导致土壤有机质（SOM）逐渐积累，而重新引入耕作通常可以逆转耕作。但是，可能需要在低降水量地区进行耕作，以管理杂草和分散不动的土壤养分。这项研究的主要目的是评估单个夏季耕作对二氧化碳（CO 2 ），甲烷（CH 4 ）和一氧化二氮（N 2 O），冬小麦-夏季休耕系统中耕种的土壤水分填充的孔隙空间（WFPS），溶解的有机碳（DOC）和硝酸盐（NO 3 ）九年免耕（NTT）后第一次耕作（不耕作（NT，免耕）或经常耕种（常规耕作，CT;有机耕作，CF））。该研究建立在美国中部高平原地区，那里的年平均降水量为332±39 mm。在耕作之前（零时）以及在1小时，5小时，25小时和50小时之后收集土壤和气体样品。在所有耕作处理的前1至5小时内观察到CO 2 和N 2 O通量立即增加，但累积了50小时的N 2 O和CO 2 与NT中观察到的值没有差异。但是，耕作使NTT的50小时累积CH 4 同化率比NT高22％，在CT中与CH 4 相当，表明土壤通气性增强。 NTT期间的土壤NO 3 不变，与CT和CF不同，而土壤DOC在NTT直到25小时后才增加，恢复到与零时相当的水平。相反，CT和CF中的DOC在50小时后继续保持升高。总之，夏季在干燥土壤上进行的长期免耕的单耕事件并没有抵消与SOM应计相关的收益，对于农民解决一些与管理相关的问题可能是一种可行的选择。

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