不同区域旱地土壤氨挥发过程同位素δ15N变化规律
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1.海南大学热带作物学院;2.中国科学院南京土壤研究所 ,土壤与农业可持续发展国家重点实验室,江苏常熟农田生态系统国家野外科学观测站

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国家自然科学基金项目(面上项目,重点项目,重大项目)


Changes of δ15N Values during Ammonia Volatilization from Different Upland Soils in China
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1.College of Tropical Crops, Hainan University;2.State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Changshu National Agro-Ecosystem Observation and Research Station

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The National Natural Science Foundation of China (General Program, Key Program, Major Research Plan)

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    摘要:

    大气氨(NH3)是PM2.5形成的重要前体物,明确和量化农田等排放源对大气NH3的贡献,是大气污染治理的基础。农田NH3挥发是大气NH3的重要来源之一,氮同位素自然丰度(δ15N)特征可以用来定量溯源大气NH3的来源,但目前对于农田土壤NH3挥发全过程δ15N值动态变化规律的研究比较缺乏,且农田土壤NH3挥发受土壤性质等不同因素的影响,会直接或间接地影响NH3挥发的δ15N值,进而影响溯源结果。旱地土壤NH3挥发在我国农田NH3挥发中占主导地位,本研究选取我国4个不同区域旱地土壤(辽宁北票、河南新乡、河北唐山、西藏林芝),添加尿素后在受控条件下采用海绵吸收法开展了为期15天的室内培养试验,通过化学转化法测定了不同区域土壤NH3挥发全过程δ15N值并观察其变化规律。结果表明,辽宁北票、河南新乡、河北唐山、西藏林芝的土壤NH3挥发过程δ15N值变化范围分别为-26.14‰~-5.57‰、-31.92‰~-26.31‰、-24.41‰~-3.11‰、-29.17‰~-2.20‰,均值分别为-21.74±1.89‰、-29.31±1.72‰、-19.82±2.04‰、-23.25±2.16‰。不同区域旱地土壤NH3挥发过程δ15N值的特征存在差异,新乡土壤的δ15N-NH3值持续升高,而北票、唐山和林芝土壤的δ15N-NH3值出现先降低后升高的趋势。土壤性质、NH3挥发速率是影响NH3挥发δ15N值的主要因素,其中土壤pH、NH3挥发速率和累积损失量与δ15N-NH3值显著负相关;另外,同位素分馏效应对δ15N-NH3值也有一定的影响。本研究结果可为大气NH3的定量溯源提供更好的支撑。

    Abstract:

    【Objective】Atmospheric ammonia (NH3) is an important precursor for the formation of PM2.5. Hence, identification and quantification of the sources of atmospheric NH3 are important for NH3 emission abatement and air pollution control. Farmland NH3 volatilization is one of the important sources of atmospheric NH3. The technology of natural abundance of nitrogen isotopes (δ15N) has been used to trace NH3 sources in recent years. Despite these advances, studies on the dynamic change of δ15N values from the whole process of NH3 volatilization from farmland soils are lacking. Moreover, NH3 volatilization from farmland soils is affected by different factors such as soil properties, pH, which can directly or indirectly influence the δ15N values of volatilized NH3 and may lead to uncertainties in sources traceability. Upland soil NH3 volatilization dominates total farmland NH3 volatilization in China. We selected four types of upland soil from different regions in China to study the δ15N values of NH3 volatilization from the whole volatilization process to clarify the changes of δ15N-NH3 values and their impacting factors.【Method】Urea was applied to four types of soils from Liaoning, Hebei, Henan and Tibet, and NH3 volatilization was studied in a 15-day indoor culture experiment by the sponge absorption method under controllable conditions. The δ15N value during the whole process of NH3 volatilization was measured by the chemical transformation method.【Result】Results showed that the values of δ15N during NH3 volatilization from Beipiao soil from Liaoning Province ranged from -26.14‰ to -5.57‰, with an average of -21.74±1.89‰. The variation range of δ15N values of Xinxiang soil (from Henan province) was from -31.92‰ to -26.31‰, with an average value of -29.31±1.72‰ while that of Tangshan soil (from Hebei province) and Linzhi soil (from Tibet) ranged from -24.41‰ to -3.11‰ with an average of 19.82±2.04‰, and from -29.17‰ to -2.20‰ with an average of -23.25±2.16‰, respectively. Overall, the δ15N values of the NH3 volatilization process in upland soils from different regions are different. During the whole process of soil NH3 volatilization, the δ15N-NH3 values of Xinxiang continued to increase, and the δ15N-NH3 values of Beipiao, Tangshan and Linzhi first decreased and then increased. Soil properties and NH3 volatilization rate are the main factors affecting the δ15N value.【Conclusion】Our results showed that soil pH, NH3 volatilization rate and cumulative NH3 loss were significantly negatively correlated with the δ15N-NH3 values. In addition, isotope fractionation also impacts the δ15N-NH3 values. The results of this study can provide better support for the quantitative traceability of atmospheric NH3.

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李淼,遆超普,彭凌云,陶莉敏,白潇,李承霖,孟磊,颜晓元.不同区域旱地土壤氨挥发过程同位素δ15N变化规律[J].土壤学报,,[待发表]
LI Miao, TI Chaopu, PENG Lingyun, TAO Limin, BAI Xiao, LI Chenglin, MENG Lei, YAN Xiaoyuan. Changes of δ15N Values during Ammonia Volatilization from Different Upland Soils in China[J]. Acta Pedologica Sinica,,[In Press]

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