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首页> 外文期刊>Atmospheric environment >Diel pattern of soil respiration in N-amended soil under maize cultivation
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Diel pattern of soil respiration in N-amended soil under maize cultivation

机译：玉米氮素改良土壤呼吸作用的Diel模式。

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摘要

To understand maize- and N-induced diel variations in CO2 emission, we examined hourly CO2 emissions during the three typical growth stages of maize in sandy loam soil. There was a distinct diel pattern in Soil CO2 emissions, with the peak occurring between 14:00 and 18:00 and the trough occurring between 0:00 and 4:00. Maize presence delayed the time of the peak. The absolute amount and diel fluctuation of CO2 emissions tended to diminish with time in the bare soil fertilized with 150 kg N ha(-1) (BS). In contrast, N-fertilized maize (N 150) significantly enhanced the total amount of CO2 emissions and the peak-trough differences in CO2 emissions, which reached a maximum at the pollination stage and then decreased. Control soil (CK) containing maize but no N fertilizer had highest overall CO2 emissions but reduced diel fluctuation because rhizosphere respiration was elevated in the nighttime. Soil temperature accounted for 61-71% of diel variation in the BS treatment but for only 44-59% and 38-58% in the N150 and CK treatments, respectively. Photosynthesis rates affected diel variation at the seedling and pollination stages. Both temperature and photosynthesis rates together explained up to 67-84% of diel variation at the seedling and pollination stages in the N150 treatment, but only 61% at the seedling stage in the CK treatment due to more CO2 released in the nighttime. The increased nighttime CO2 release, in turn, decreased the effect of temperature and even reduced the influence of photosynthesis rate on diel variations in CO2 release. Based on the present results, the best time for obtaining a representative daily CO2 measurement was found to be approximately 8:00 at the seedling stage and 9:00-11:00 at the other growth stages. The current findings indicate that N addition reduces soil CO2 emissions and its diel fluctuation. (c) 2006 Elsevier Ltd. All rights reserved.
机译：为了了解玉米和氮诱导的diel在CO2排放中的变化，我们检查了沙壤土中玉米三个典型生长阶段的每小时CO2排放。土壤CO2排放存在明显的迪尔模式，峰值发生在14:00和18:00之间，波谷发生在0:00和4:00之间。玉米的出现延迟了高峰期。在以150 kg N ha（-1）（BS）施肥的裸露土壤中，CO2排放的绝对量和diel波动趋于随时间减少。相反，氮肥玉米（N 150）显着增加了CO2排放总量和CO2排放的峰谷差，在授粉期达到最大值，然后降低。含有玉米但不含氮肥的对照土壤（CK）的总CO2排放量最高，但由于夜间根际呼吸增加，从而降低了白el波动。在BS处理中，土壤温度占diel变化的61-71％，但在N150和CK处理中，土壤温度分别仅占44-59％和38-58％。光合作用速率影响苗期和授粉期的diel变化。在N150处理中，温度和光合作用率共同解释了在幼苗和授粉阶段高达67-84％的diel变化，但是在CK处理中，由于夜间释放的更多的CO2，在幼苗阶段只有61％的diel变化。夜间CO2释放量的增加反过来降低了温度的影响，甚至降低了光合作用速率对CO2释放中diel变化的影响。根据目前的结果，发现获得代表性的每日CO2测量值的最佳时间在苗期约为8:00，而在其他生育期约为9：00-11：00。目前的发现表明，氮的添加减少了土壤CO2排放及其diel波动。 （c）2006 Elsevier Ltd.保留所有权利。

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