数字农科院2.0

Role of Carbon Substrates Added in the Transformation of Surplus Nitrate to Organic Nitrogen in a Calcareous Soil

文献类型： 外文期刊

作者： Qiu Shao-Jun;Ju Xiao-Tang;Guo Zi-De;Christie, P.;Zhang Fu-Suo;Qiu Shao-Jun;Ingwersen, J.;Bisharat, R.;Streck, T.;Stange, C. F.;Christie, P.

作者机构：

关键词： available C source;carbon amendments;greenhouse gases;N immobilization;N-15 tracer

期刊名称： PEDOSPHERE

ISSN： 1002-0160

年卷期： 2013 年 23 卷 2 期

页码：

收录情况： SCI

摘要： Excessive amounts of nitrate have accumulated in many soils on the North China Plain due to the large amounts of chemical N fertilizers or manures used in combination with low carbon inputs. We investigated the potential of different carbon substrates added to transform soil nitrate into soil organic N (SON). A 56-d laboratory incubation experiment using the N-15 tracer ((KNO3)-N-15) technique was carried out to elucidate the proportion of SON derived from accumulated soil nitrate following amendment with glucose or maize straw at controlled soil temperature and moisture. The dynamics and isotopic abundance of mineral N (NO3- and NH4+) and SON and greenhouse gas (N2O and CO2) emissions during the incubation were investigated. Although carbon amendments markedly stimulated transformation of nitrate to newly formed SON, this was only a substitution effect of the newly formed SON with native SON because SON at the end of the incubation period was not significantly different (P > 0.05) from that in control soil without added C. At the end of the incubation period, amendment with glucose, a readily available C source, increased nitrate immobilization by 2.65 times and total N2O-N emission by 33.7 times, as compared with maize straw amendment. Moreover, the differences in SON and total N2O-N emission between the treatments with glucose and maize straw were significant (P < 0.05). However, the total N2O-N emission in the straw treatment was not significantly (P > 0.05) greater than that in the control. Straw amendment may be a potential option in agricultural practice for transformation of nitrate N to SON and minimization of N2O emitted as well as restriction of NO3-N leaching.

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