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首页> 外文期刊>Journal of arid environments >Influence of water regime and N availability on the emission of nitrous oxide and carbon dioxide from tropical, semi-arid soils of Chiapas, Mexico
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Influence of water regime and N availability on the emission of nitrous oxide and carbon dioxide from tropical, semi-arid soils of Chiapas, Mexico

机译：墨西哥恰帕斯州热带半干旱土壤中水分状况和氮素供应对一氧化二氮和二氧化碳排放的影响

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摘要

The concentration of nitrous oxide (N_2O) and carbon dioxide (CO_2) in the atmosphere has increased considerably over the last century, but few studies are available showing their production from soils in semi-arid areas. Soils from the tropical semi-arid Central Depression of Chiapas were sampled from fields cultivated with maize (MAI treatment), under canopy of Acacia angustissima (TIMBRE) or outside the canopy of the trees (OUT), adjusted to 40%, 60%, 80% or 100% of water-holding capacity (WHC) and amended with 0, 15 or 50mg (NH_4NO_3)-N kg~(-1) dry soil. The production of N_2O, CO_2 and concentrations of NH_4~+, and NO_3~- were monitored in the laboratory under aerobic conditions. Production of N_2O in the first 3 days was significantly larger from the MAI and OUT soils, compared to the TIMBRE soil, while the addition of 50 mg inorganic N doubled the production of N_2O. In all treatments, soil at 100% WHC had the largest production of N_2O. The emission of CO_2 was significantly larger from soils at 60% and 80% WHC compared to the soil at 40% and 100% WHC, although the addition of inorganic N had no significant effect on CO_2 emission. The application of inorganic N and the absence of vegetation increased the production of N_2O.
机译：上个世纪以来，大气中的一氧化二氮（N_2O）和二氧化碳（CO_2）的浓度已大大增加，但是很少有研究表明它们是从半干旱地区的土壤中产生的。来自恰帕斯州热带半干旱中心恰帕斯州的土壤是从玉米种植的田地（MAI处理），相思树冠层（TIMBRE）或树冠层（OUT）外取样的，分别调整为40％，60％，持水量（WHC）的80％或100％，并用0、15或50mg（NH_4NO_3）-N kg〜（-1）干燥土壤进行修正。在有氧条件下，在实验室中监测N_2O，CO_2的产生以及NH_4〜+和NO_3〜-的浓度。与TIMBRE土壤相比，在MAI和OUT土壤中，前3天的N_2O产量显着增加，而添加50 mg无机N使N_2O的产量翻倍。在所有处理中，WHC为100％的土壤中N_2O的产量最高。 WHC 60％和80％时土壤的CO_2排放量明显高于WHC 40％和100％时土壤，尽管添加无机氮对CO_2的排放没有显着影响。无机氮的施用和植被的缺乏增加了N_2O的产生。

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