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Organic carbon quality, composition of main microbial groups, enzyme activities, and temperature sensitivity of soil respiration of an acid paddy soil treated with biochar

文献类型： 外文期刊

作者： Chen, Junhui 1 ; Chen, De 2 ; Xu, Qiufang 1 ; Fuhrmann, Jeffry J. 4 ; Li, Lianqing 2 ; Pan, Genxing 2 ; Li, Yongfu 1 ; Qi 1 ;

作者机构： 1.Zhejiang A&F Univ, Sch Environm & Resource Sci, Zhejiang Prov Key Lab Carbon Cycling Forest Ecosy, State Key Lab Subtrop Silviculture, Hangzhou 311300, Zhejiang, Peoples R China

2.Nanjing Agr Univ, Inst Resource Ecosyst & Environm Agr, Nanjing 210095, Jiangsu, Peoples R China

3.Zhejiang Acad Agr Sci, Inst Qual & Stand Agroprod, Hangzhou 310021, Zhejiang, Peoples R China

4.Univ Delaware, Dept Plant & Soil Sci, Newark, DE 19716 USA

关键词： Biochar; C-13 NMR; Phospholipid-fatty acids; Soil microbial respiration; Soil organic carbon; Temperature sensitivity

期刊名称：BIOLOGY AND FERTILITY OF SOILS （ 影响因子：6.432； 五年影响因子：6.332 ）

ISSN： 0178-2762

年卷期： 2019 年 55 卷 2 期

页码：

收录情况： SCI

摘要： The role of soil organic C (SOC) quality affecting microbial community composition and function under biochar application is poorly understood. We investigated the relationship between the pool size and chemical composition of SOC; composition of main microbial groups; enzyme activities involved in C, N, and P cycling; and soil respiration in a rice paddy amended with biochar for 20months in a laboratory experiment at 15, 25, and 35 degrees C. Soil labile and recalcitrant organic C pools were determined by a two-step sulfuric acid (H2SO4) hydrolysis method. The chemical composition of SOC was determined with C-13-nuclear magnetic resonance spectroscopy. The biochar amendment at 20 and 40tha(-1) significantly decreased the soil labile C pool I (extracted by 5N H2SO4), alkyl, and carbonyl C contents and increased the recalcitrant C pool (acid-resistant) and aromatic C contents and the aromatic C to O-alkyl C ratio. The phospholipid-fatty acid concentrations and soil enzyme activities were unchanged by biochar application at 10 and 20tha(-1), but both were increased at 40tha(-1). Biochar increased the ratio of gram-positive (G+) to gram-negative (G-) bacteria and decreased that of fungi to bacteria. The recalcitrant C pool and aromatic C contents were positively correlated to the G+ bacteria abundance and were important factors in shaping composition of the main microbial groups and improving enzyme activities. Biochar application at 40tha(-1) lowered soil respiration rates at 15 and 25 degrees C by decreasing labile C pool and increasing C recalcitrancy while increased temperature sensitivities of soil respiration at 25/15 degrees C and 35/25 degrees C by stimulating microbial abundance and enzyme activities. Together, our results suggest that biochar soil amendment shifted microbial community composition and function through influencing the composition of SOC.

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