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

第一作者： Chen, Junhui

作者： Chen, Junhui;Xu, Qiufang;Li, Yongfu;Qin, Hua;Liang, Chenfei;Sun, Xuan;Chen, De;Li, Lianqing;Pan, Genxing;Chen, De;Fuhrmann, Jeffry J.

作者机构：

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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