首页|Straw and biochar strongly affect functional diversity of microbial metabolism in paddy soils

Straw and biochar strongly affect functional diversity of microbial metabolism in paddy soils

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The application of straw and biochar is widely practiced for the improvement of soil fertility. However, its impact on microbial functional profiles, particularly with regard to paddy soils, is not well understood. The aim of this study was to investigate the diversity of microbial carbon use patterns in paddy soils amended with straw or straw-derived biochar in a 3-year field experiment in fallow soil and at various development stages of a rice crop (i.e., tillering and blooming). We applied the community level physiological profiling approach, with 15 substrates (sugars, carboxylic and amino acids, and phenolic acid). In general, straw application resulted in the greatest microbial functional diversity owing to the greater number of available C sources than in control or biochar plots. Biochar amendment promoted the use of α-ketoglutaric acid, the mineralization of which was higher than that of any other substrate. Principal component analyses indicated that microbial functional diversity in the biochar-amended soil was separated from those of the straw-amended and control soils. Redundancy analyses revealed that soil organic carbon content was the most important factor regulating the pattern of microbial carbon utilization. Rhizodeposition and nutrient uptake by rice plants modulated microbial functions in paddy soils and stimulated the microbial use of N-rich substances, such as amino acids. Thus, our results demonstrated that the functional diversity of microorganisms in organic amended paddy soils is affected by both physicochemical properties of amendment and plant growth stage.

carbon metabolismmicrobial functional diversitybiochar amendmentpaddy soilMicroRespTM

YUAN Hong-zhao、ZHU Zhen-ke、WEI Xiao-meng、LIU Shou-long、PENG Pei-qin、Anna Gunina、SHEN Jian-lin、Yakov Kuzyakov、GE Ti-da、WU Jin-shui、WANG Jiu-rong

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Key Laboratory of Agro-ecological Processes in Subtropical Region/Changsha Research Station for Agricultural and Environmental Monitoring, Institute of Subtropical Agriculture, Chinese Academy of Sciences, Changsha 410125, P.R.China

College of Environmental Science and Engineering, Central South University of Forestry and Technology, Changsha 410004, P.R.China

Department of Soil Biology and Biochemistry, Dokuchaev Soil Science Institute, Moscow 119017, Russian Federation

Department of Agricultural Soil Science, University of G?ttingen, G?ttingen 37077, Germany

Institute of Environmental Sciences, Kazan Federal University, Kazan 420049, Russian Federation

Agro-Technology Institute, RUDN University, Moscow 117198, Russian Federation

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This study was financially supported by the National Key Research and Development Program of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaYouth Innovation Team Project of the Institute of Subtropical Agriculture, Chinese Academy of SciencesChinese Academy of Sciences Instrument Function Development Project, and the Government Program of Competitive Growth of Kaz

2016YFE01011004177133441771337314706292017QNCXTD_GTD

2019

农业科学学报(英文)
中国农业科学院农业信息研究所

农业科学学报(英文)

CSTPCDCSCDSCI
影响因子：0.576
ISSN：2095-3119
年,卷(期)：2019.18(7)
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