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| Effect of biochar on adsorption-desorption characteristics of nitrate nitrogen in black soil |
| Received:July 31, 2015 |
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| KeyWord:corn-stalk biochar;rice-hull biochar;larch biochar;nitrate nitrogen;adsorption;desorption |
| Author Name | Affiliation | E-mail | | WANG Bing | College of Resources and Environmental Science, Jilin Agricultural University, Changchun 130118, China
Key Laboratory of Soil Resource Sustainable Utilization for Jilin Province Commodity Grain Bases, Changchun 130118, China | | | ZHAO Shan-shan | College of Resources and Environmental Science, Jilin Agricultural University, Changchun 130118, China
Key Laboratory of Soil Resource Sustainable Utilization for Jilin Province Commodity Grain Bases, Changchun 130118, China | | | QIN Zhi-jia | Zu Min Agriculture Stands of Dongliao County, Jilin Province, Dongliao 136615, China | | | GAO Qiang | College of Resources and Environmental Science, Jilin Agricultural University, Changchun 130118, China
Key Laboratory of Soil Resource Sustainable Utilization for Jilin Province Commodity Grain Bases, Changchun 130118, China | | | LOU Yu-jie | College of Animal Science and Technology, Jilin Agricultural University, Changchun 130118, China | | | LIU Shu-xia | College of Resources and Environmental Science, Jilin Agricultural University, Changchun 130118, China
Key Laboratory of Soil Resource Sustainable Utilization for Jilin Province Commodity Grain Bases, Changchun 130118, China | liushuxia2005824@163.com |
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| Abstract: |
| It is well documented that biochar can adsorb nitrate nitrogen(NO3--N) from water. However, few studies were available on the effects of biochar applications on adsorption-desorption properties of NO3--N in soil. In this study, an incubation experiment was conducted to assess the effects of different biochars(corn-stalk biochar, rice-hull biochar and larch biochar) at four application rates(0.6%,1.2%, 3.6%, and 6%) on adsorption and desorption of NO3--N in black soil. Results showed that biochar applications increased NO3--N adsorption, with the highest adsorption capacity occurred in soil added with 3.6% biochar. Of three biochars, corn-stalk biochar had the highest NO3--N adsorption capacity, which was 0.929 mg·g-1, whereas larch biochar had the lowest NO3--N adsorption, with only 0.578 mg·g-1. Applications of biochars reduced the desorption rates of NO3--N from soil. The lowest desorption was found at a biochar rate of 3.6%. On the contrary, corn-stalk biochar had the lowest NO3--N desorption while larch biochar displayed the highest desorption. The adsorption ability of NO3--N by biochars was:corn-stalk biochars > rice-hull biochar > larch biochar, but the desorption was opposite. The isothermal adsorption of NO3--N on soil amended with biochars could be well described by Langmuir isothermal equation. |
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