美国农业土壤氮动态的温度敏感性

A. Chatterjee, Alexsandro Felipe de Jesus, Diksha Goyal, S. Sigdel, L. Cihacek, Bhupinder S. Farmaha, S. Jagadamma, L. Sharma, D. Long
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引用次数: 3

摘要

土壤温度通过一氧化二氮(N2O)和氨(NH3)的通量控制气态氮的损失。在10°C、20°C和30°C条件下培养8种美国农田表层土壤,每周两次测量N2O和NH3通量,分别持续91和47 d。利用Arrhenius方程拟合3种温度下N2O和NH3累积通量及净N矿化的变化,计算Q10。对于大多数土壤,N2O损失的Q10值在0.23 ~ 2.14之间,除了北卡罗来纳州的布莱克维尔(11.4)和田纳西州的杰克逊(10.1)。NH3通量的Q10值从0.63(缅因州Frenchville)到1.24(内布拉斯加州North Bend)不等。土壤净氮矿化q10为0.96 ~ 1.00。土壤有机碳和全氮的分布可以解释Q10对N2O损失的变异性。了解土壤氮素动态的Q10变异性有助于预测土壤氮素的流失。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Temperature Sensitivity of Nitrogen Dynamics of Agricultural Soils of the United States
Soil temperature controls gaseous nitrogen losses through nitrous oxide (N2O) and ammonia (NH3) fluxes. Eight surface soils from agricultural fields across the United States were incubated at 10°C, 20°C, and 30°C, and N2O and NH3 flux were measured twice a week for 91 and 47 d, respectively. Changes in cumulative N2O and NH3 flux and net N mineralization at three temperatures were fitted to calculate Q10 using the Arrhenius equation. For the majority of soils, Q10 values for the N2O loss ranged between 0.23 and 2.14, except for Blackville, North Carolina (11.4) and Jackson, Tennessee (10.1). For NH3 flux, Q10 values ranged from 0.63 (Frenchville, Maine) to 1.24 (North Bend, Nebraska). Net soil N mineralization-Q10 ranged from 0.96 to 1.00. Distribution of soil organic carbon and total soil N can explain the variability of Q10 for N2O loss. Understanding the Q10 variability of soil N dynamics will help us to predict the N loss.
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