Maize biochars accelerate short-term soil nitrogen dynamics in a loamy sand soil
Maize biochars accelerate short-term soil nitrogen dynamics in a loamy sand soil
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DOI：
10.1016/j.soilbio.2012.05.019
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发表时间：
2012-12-01
影响因子：
9.7
通讯作者：
Boeckx, Pascal
中科院分区：
文献类型：
--
作者：
Nelissen, Victoria;Rutting, Tobias;Boeckx, Pascal
向土壤中添加生物炭已被提议作为提高土壤肥力和固碳的一种手段。然而，其对土壤氮素循环和氮素有效性的影响知之甚少。为了更好地了解生物炭对土壤总氮转化过程的短期影响，采用N-15示踪试验结合数值分析方法进行了研究。使用可耕种的壤质砂土，并与在350 ℃和550 ℃下产生的两种青贮玉米生物炭混合。结果表明，添加生物炭后土壤氮素循环加快，总氮矿化率（185-221%）、硝化率（10-69%）和铵态氮（NH 4+）消耗率（333-508%）均有所增加。此外，转移的N从一个不稳定的土壤有机N（N-rec）库到一个更不稳定的土壤有机N（N-lab）库进行了观察。在对照处理中，8%的从N-lab矿化的NH 4+被固定到N-rec池。相比之下，79%和55%的NH 4+矿化从N-rec被固定到N-rec池中的处理与生物炭-350摄氏度和生物炭-550摄氏度，分别。在试验开始时，NH 4 +-N被生物炭迅速吸附，从而缓冲了植物有效N。总之，这些类型的生物炭在短期内加速土壤氮素转化，从而提高土壤氮的生物有效性，通过矿化的柠檬酸盐土壤有机氮库和随后的NH 4+固定在一个不稳定的土壤有机氮库的综合效应。(C)2012爱思唯尔有限公司保留所有权利。
Biochar addition to soils has been proposed as a means to increase soil fertility and carbon sequestration. However, its effect on soil nitrogen (N) cycling and N availability is poorly understood. To gain better insight into the short-term effects of biochar on gross N transformation processes, a N-15 tracing experiment in combination with numerical data analysis was conducted. An arable loamy sand soil was used and mixed with two silage maize biochars, produced at 350 degrees C and 550 degrees C. The results showed accelerated soil N cycling following biochar addition, with increased gross N mineralization (185-221%), nitrification (10-69%) and ammonium (NH4+) consumption rates (333-508%). Moreover, transfer of N from a recalcitrant soil organic N (N-rec) pool to a more labile soil organic N (N-lab) pool was observed. In the control treatment, 8% of the NH4+ mineralized from N-lab was immobilized to the N-rec pool. In contrast, 79% and 55% of the NH4+ mineralized from N-rec were immobilized to the N-rec pool in the treatment with biochar-350 degrees C and biochar-550 degrees C, respectively. NH4+-N was adsorbed quickly to biochar at the start of the experiment, thereby buffering plant-available N. In conclusion, these types of biochar accelerated soil N transformations in the short term, thereby increasing soil N bio-availability, through a combined effect of mineralization of the recalcitrant soil organic N pool and subsequent NH4+ immobilization in a labile soil organic N pool. (C) 2012 Elsevier Ltd. All rights reserved.