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995 results on '"Tang, Caixian"'

26. Bacterial community structure and putative nitrogen-cycling functional traits along a charosphere gradient under waterlogged conditions

Author

Yu, Mengjie, Su, Wei-qin, Huang, Laibin, Parikh, Sanjai J, Tang, Caixian, Dahlgren, Randy A, and Xu, Jianming

Subjects
Environmental Sciences, Soil Sciences, Biochar, Bacterial community structure, Nitrification, Denitrification, N-2-fixation, N transformations, Biological Sciences, Agricultural and Veterinary Sciences, Agronomy & Agriculture, Soil sciences
Abstract

Unique spatial niches created by biochar form a dynamic biogeochemical soil zone, termed the “charosphere”. Charosphere soil has different properties from either soil or biochar, often acting as a hotspot for microbial activity. However, the direction and magnitude of charosphere effects on soil processes and microbial communities remain inconclusive. Herein, we designed a multi-sectional box to separate charosphere soils from biochar under waterlogged conditions, investigating millimeter-scale changes in bacterial communities and distributions of specific genera across the charosphere created by pristine biochar (produced from corn stover at 300 °C), acid-modified biochar and washed biochar. The pristine biochar did not increase bacterial α-diversity but altered bacterial composition by promoting the growth of specific bacterial taxa and suppressing other species. In comparison, washed and acid-modified biochar increased the bacterial α-diversity. The pristine biochar significantly decreased N2O emission and NO3− concentration owing to a lower soil nitrification potential. Abundances of N-cycling functional taxa were higher in the near-charosphere than outer-charosphere zone, especially for Bacillus (N2-fixation), MND1 (ammonia oxidation) and Rhodopseudomonas (denitrification). The spatial distribution of functional genes and genera documents the importance of heterogeneity within the charosphere gradient, providing a novel perspective into functional geometry to understand how biochar reduces N losses from agroecosystems.

Published
2021

29. Habitat heterogeneity induced by pyrogenic organic matter in wildfire-perturbed soils mediates bacterial community assembly processes

Author

Zhang, Lujun, Ma, Bin, Tang, Caixian, Yu, Haodan, Lv, Xiaofei, Mazza Rodrigues, Jorge L, Dahlgren, Randy A, and Xu, Jianming

Subjects
Microbiology, Environmental Sciences, Biological Sciences, Ecology, Microbiota, Phylogeny, Soil, Soil Microbiology, Wildfires, Technology, Biological sciences, Environmental sciences
Abstract

Although pyrogenic organic matter (PyOM) generated during wildfires plays a critical role in post-fire ecosystem recovery, the specific mechanisms by which PyOM controls soil microbial community assembly after wildfire perturbation remain largely uncharacterized. Herein we characterized the effect of PyOM on soil bacterial communities at two independent wildfire-perturbed forest sites. We observed that α-diversity of bacterial communities was the highest in wildfire-perturbed soils and that bacterial communities gradually changed along a sequence of unburnt soil → burnt soil → PyOM. The microbial communities reconstructed from unburnt soil and PyOM resembled the real bacterial communities in wildfire-perturbed soils in their α-diversity and community structure. Bacterial specialists in PyOM and soils clustered in phylogenetic coherent lineages with intra-lineage pH-niche conservatism and inter-lineage pH-niche divergence. Our results suggest that PyOM mediates bacterial community assembly in wildfire-perturbed soils by a combination of environmental selection and dispersal of phylogenetic coherent specialists with habitat preference in the heterogeneous microhabitats of burnt soils with distinct PyOM patches.

Published
2021

31. Soil Biogeochemical Cycle Couplings Inferred from a Function-Taxon Network

Author

Ma, Bin, Stirling, Erinne, Liu, Yuanhui, Zhao, Kankan, Zhou, Jizhong, Singh, Brajesh K, Tang, Caixian, Dahlgren, Randy A, and Xu, Jianming

Subjects
Microbiology, Agricultural, Veterinary and Food Sciences, Biological Sciences, Forestry Sciences, Life Below Water
Abstract

Soil biogeochemical cycles and their interconnections play a critical role in regulating functions and services of environmental systems. However, the coupling of soil biogeochemical processes with their mediating microbes remains poorly understood. Here, we identified key microbial taxa regulating soil biogeochemical processes by exploring biomarker genes and taxa of contigs assembled from metagenomes of forest soils collected along a latitudinal transect (18° N to 48° N) in eastern China. Among environmental and soil factors, soil pH was a sensitive indicator for functional gene composition and diversity. A function-taxon bipartite network inferred from metagenomic contigs identified the microbial taxa regulating coupled biogeochemical cycles between carbon and phosphorus, nitrogen and sulfur, and nitrogen and iron. Our results provide novel evidence for the coupling of soil biogeochemical cycles, identify key regulating microbes, and demonstrate the efficacy of a new approach to investigate the processes and microbial taxa regulating soil ecosystem functions.

Published
2021

48. Microspectroscopic visualization of how biochar lifts the soil organic carbon ceiling

Author

Weng, Zhe (Han), Van Zwieten, Lukas, Tavakkoli, Ehsan, Rose, Michael T., Singh, Bhupinder Pal, Joseph, Stephen, Macdonald, Lynne M., Kimber, Stephen, Morris, Stephen, Rose, Terry J., Archanjo, Braulio S., Tang, Caixian, Franks, Ashley E., Diao, Hui, Schweizer, Steffen, Tobin, Mark J., Klein, Annaleise R., Vongsvivut, Jitraporn, Chang, Shery L. Y., Kopittke, Peter M., and Cowie, Annette

Published
2022
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