How does biochar influence soil N cycle? A meta-analysis

Liu, Qi; Zhang, Yanhui; Liu, Benjuan; Amonette, James E.; Lin, Zhibin; Liu, Gang; Ambus, Per L.; Xie, Zubin

doi:10.1007/s11104-018-3619-4

How does biochar influence soil N cycle? A meta-analysis

Journal Article · Tue May 15 04:00:00 EDT 2018 · Plant and Soil

DOI:https://doi.org/10.1007/s11104-018-3619-4· OSTI ID:1735730

Liu, Qi ^[1]; Zhang, Yanhui ^[1]; Liu, Benjuan ^[1]; ^[2]; Lin, Zhibin ^[1]; Liu, Gang ^[1]; Ambus, Per L. ^[3]; Xie, Zubin ^[1]

Institute of Soil Science, Chinese Academy of Sciences
BATTELLE (PACIFIC NW LAB)
University of Copenhagen

Modern agriculture is driving the release of excessive amounts of reactive nitrogen (N) from the soils to the environment, thereby threatening ecological balances and functions. The amendment of soils with biochar has been suggested as a promising solution to regulate the soil N cycle and reduce N effluxes. However, a comprehensive and quantitative understanding of biochar impacts on soil N cycle remains elusive. A meta-analysis was conducted to assess the influence of biochar on different variables involved in soil N cycle using data compiled across 208 peer-reviewed studies. On average, biochar beneficially increases symbiotic biological N2 fixation (63%), improves plant N uptake (11%), reduces soil N2O emissions (32%), and decreases soil N leaching (26%), but it poses a risk of increased soil NH3 volatilization (19%). Biochar-induced increase in soil NH3 volatilization commonly occurs in studies with soils of low buffering capacity (soil pH = 5, organic carbon = 10 g/kg, or clay texture), the application of high alkaline biochar (straw- or manure-derived biochar), or biochar at high application rate (>40 t/ha). Besides, if the pyrolytic syngas is not purified, the biochar production process may be a potential source of N2O and NOx emissions which correspond to 2–4% and 3–24% of the feedstock-N, respectively. This study suggests that to make biochar beneficial for decreasing soil N effluxes, clean advanced pyrolysis technique and adapted use of biochar are of great importance.

Research Organization:: Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)

Sponsoring Organization:: USDOE

DOE Contract Number:: AC05-76RL01830

OSTI ID:: 1735730

Report Number(s):: PNNL-SA-138141

Journal Information:: Plant and Soil, Journal Name: Plant and Soil Journal Issue: 1-2 Vol. 426

Country of Publication:: United States

Language:: English

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