NDLI: Controls and dynamics of biochar decomposition and soil microbial abundance, composition, and carbon use efficiency during long-term biochar-amended soil incubations

Content Provider	Springer Nature Link
Author	Jiang, Xinyu Denef, Karolien Stewart, Catherine E. Cotrufo, M. Francesca
Copyright Year	2015
Abstract	The process-level understanding of biochar-C decomposition and microbial utilization in soils is poorly understood as well as how these dynamics vary across different addition rates and soil types. We present results from a 30-month laboratory incubation, where oak-derived biochar was added at 0, 1, 5, 10, and 20 % rate by weight to four soils varying in soil properties. We determined biochar-C loss using natural abundance 13C isotope coupled to measurements of CO2 efflux. We measured microbial abundance, composition, and C use efficiency (CUE) using phospholipid fatty acid biomarkers and 13C labeled glucose, respectively. After 30 months, the amount of the remaining biochar-C was insignificantly different between different biochar addition rates, suggesting that biochar-C loss is proportional to biochar addition rates. In soils with higher C contents (i.e., >1.5 %), biochar decomposition rates appeared to slow down after initial fast decomposition; while biochar decomposition rates followed one-pool model for soils with lower C. Soil microbial composition significantly changed at 10 or 20 % addition rate after 30 months, which was correlated with the increase in soil C/N. The highest CUE was found at 1 or 5 %, depending on soil types.
Starting Page	1
Ending Page	14
Page Count	14
File Format	PDF
ISSN	01782762
Journal	Biology and Fertility of Soils
Volume Number	52
Issue Number	1
e-ISSN	14320789
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2015-08-19
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Biochar decomposition Microbial composition Carbon use efficiency Long-term incubation Agriculture Soil Science & Conservation
Content Type	Text
Resource Type	Article
Subject	Agronomy and Crop Science Soil Science Microbiology

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