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

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. © 2019 CAAS. Publishing services by Elsevier B.V

YUAN H.-Z.1 , ZHU Z.-K.1 , WEI X.-M.1 , LIU S.-L.1 , PENG P.-Q.2 , Gunina A.1, 3 , SHEN J.-L.1 , Kuzyakov Y. 1, 4, 5, 6 , GE T.-D.1 , WU J.-S.1 , WANG J.-R.1
Chinese Academy of Agricultural Sciences
Номер выпуска
  • 1 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, Hong Kong
  • 2 College of Environmental Science and Engineering, Central South University of Forestry and Technology, Changsha, 410004, Hong Kong
  • 3 Department of Soil Biology and Biochemistry, Dokuchaev Soil Science Institute, Moscow, 119017, Russian Federation
  • 4 Department of Agricultural Soil Science, University of Göttingen, Göttingen, 37077, Germany
  • 5 Institute of Environmental Sciences, Kazan Federal University, Kazan, 420049, Russian Federation
  • 6 Agro-Technology Institute, RUDN University, Moscow, 117198, Russian Federation
Ключевые слова
biochar amendment; carbon metabolism; microbial functional diversity; MicroRespTM; paddy soil
Дата создания
Дата изменения
Постоянная ссылка

Другие записи