Effects of biochar addition on nitrogen uptake of Glycine max and Arachis hypogaea seedlings

XU Xingliang; FENG Yuqing; CUI Jian

doi:10.7523/j.issn.2095-6134.2017.04.009

Journal of University of Chinese Academy of Sciences >

2017 , Vol. 34 >Issue 4: 471 - 477

DOI: https://doi.org/10.7523/j.issn.2095-6134.2017.04.009

Effects of biochar addition on nitrogen uptake of Glycine max and Arachis hypogaea seedlings

XU Xingliang ,
FENG Yuqing ,
CUI Jian

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1. Key Laboratory of Ecosystem Network Observation and Modeling, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China;
2. Beijing No. 8 Middle School, Beijing 100033, China

Received date: 2016-05-30

Revised date: 2016-10-07

Online published: 2017-07-15

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Abstract

¹⁵N-labeling technique was used to investigate effects of biochar addition (0, 0.5, 2.5, and 10 mg·g^-1) on biomass and nitrogen uptake of Glycine max and Arachis hypogaea seedlings. We found that biochar addition did not significantly alter total biomass of G. max seedlings compared to control, while a significant difference was observed between two higher addition levels. Biochar addition did not change total biomass of A. hypogaea seedlings, but the highest addition level significantly increased its root to shoot ratios. Increased biochar addition substantially reduced uptake of ¹⁵NH₄⁺ and ¹⁵N-glycine by G. max seedlings, but weak effect on uptake of ¹⁵NO₃^- was observed. Biochar addition significantly decreased uptake of ¹⁵NH₄⁺ by A. hypogaea seedlings, but did not significantly affect uptake of ¹⁵N-glycine. In contrast, uptake of ¹⁵NO₃^- by A. hypogaea seedlings increased first and then decreased with biochar addition. This indicates that biochar addition affects nitrogen uptake by crops, but the effect depends on plant species and amount of added biochar. Therefore, species and nitrogen forms should be considered when biochar is used as a management measure for agricultural soil to improve nitrogen use efficiency and crop production.

Key words： biochar; NH₄⁺; NO₃^-; uptake of nitrogen; ¹⁵N labeling

Cite this article

XU Xingliang , FENG Yuqing , CUI Jian . Effects of biochar addition on nitrogen uptake of Glycine max and Arachis hypogaea seedlings[J]. Journal of University of Chinese Academy of Sciences, 2017 , 34(4) : 471 -477 . DOI: 10.7523/j.issn.2095-6134.2017.04.009

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