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Rice straw biochar alters inorganic nitrogen availability in paddy soil mainly through abiotic processes

文献类型： 外文期刊

作者： Lv, Rujie 1 ; Wang, Yong 1 ; Wang, Qiuju 1 ; Wen, Yangping 1 ; Shang, Qingyin 1 ;

作者机构： 1.Jiangxi Agr Univ, Jiangxi Key Lab Crop Physiol Ecol & Genet Breedin, Minist Educ, Nanchang 330045, Jiangxi, Peoples R China

2.Jiangxi Acad Agr Sci, Soil Fertilizer & Resource Environm Inst, Nanchang 330200, Jiangxi, Peoples R China

关键词： Rice straw biochar; Soil N availability; Microbial functional genes; Paddy field

期刊名称：JOURNAL OF SOILS AND SEDIMENTS （ 影响因子：3.536； 五年影响因子：3.821 ）

ISSN： 1439-0108

年卷期：

页码：

收录情况： SCI

摘要： Purpose Nitrogen (N) is an important element for crop yield and its availability may be affected by biochar. The mechanisms through which biochar influences N availability and thus crop productivity remain largely unclear, although they seem to be principally mediated by microbial processes. The objective of this study was to assess the effects of rice straw biochar on soil N availability and microbial functional genes (MFG) involved in N transformations under field experiment. Materials and methods The field experiment was performed using biochar amendment (0, 20, 40 t ha(-1)) with or without N fertilizer application in a rice paddy in central China. Results The results suggested that the soil NH4+-N content showed a decreasing trend during the early stage of rice growing season while increasing its availability during the later stage in the plots with biochar amendment as compared with control. Nonetheless, soil NO3--N was not affected by biochar addition, N fertilization, and their interaction at most of the sampling times. With the increase of N fertilizer and biochar application, soil MBC and MBN increased in most of the sampling times during the first and second seasons. The N uptake was significantly positively correlated with soil MBC and MBN in the first and second seasons. Biochar addition also affected some MFG involved in N transformations, causing a general decrease in the abundance of bacterial ammonia oxidizers during mature stage and narG (nitrate reduction) at heading stage during the second season independent of biochar application rates, while increase in nifH (nitrogen fixation) at heading stage during the first season in 40 t ha(-1) biochar treatments with N application, as compared with the control. However, there is lack of significant relationships between measured soil inorganic N and genetic data for each season. Conclusion As a result, the application of biochar had a slow release effect on soil NH4+-N and regulated the N uptake in rice. However, we believe that the dynamic of soil N availability during rice growing seasons may have been dominantly driven by abiotic factors rather than microbially mediated processes in double rice-cropping system.

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