on farm field experiment to investigate biochar effects on soil structure and n 2 o emissions n.
Download
Skip this Video
Loading SlideShow in 5 Seconds..
Engil Pereira, Emma Suddick , Johan Six University of California, Davis PowerPoint Presentation
Download Presentation
Engil Pereira, Emma Suddick , Johan Six University of California, Davis

Loading in 2 Seconds...

play fullscreen
1 / 18

Engil Pereira, Emma Suddick , Johan Six University of California, Davis - PowerPoint PPT Presentation


  • 151 Views
  • Uploaded on

On-farm field experiment to investigate biochar effects on soil structure and N 2 O emissions. Engil Pereira, Emma Suddick , Johan Six University of California, Davis. 2012 US Biochar Conference – Sonoma State University, Rohnert Park, CA. July 29 – August 1, 2012 . Outline.

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about 'Engil Pereira, Emma Suddick , Johan Six University of California, Davis' - dani


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
on farm field experiment to investigate biochar effects on soil structure and n 2 o emissions

On-farm field experiment to investigate biochar effects on soil structure and N2O emissions

Engil Pereira, Emma Suddick, Johan Six

University of California, Davis

2012 US Biochar Conference – Sonoma State University, Rohnert Park, CA. July 29 – August 1, 2012

outline
Outline
  • Biochar production and study site: Dixon Ridge Farm
  • Soil structure – Potential for additional C sequestration
  • N2O emissions - Link with N2O consumers
  • Concluding remarks
dixon ridge farm
Dixon Ridge Farm
  • Winters, CA
  • Organic walnut farm and processing facility
  • BioMax 50: Waste management and energy production
  • Savings: $45,000 / year
  • Closing the loop:

Biochar!

Russ Lester, co-owner of Dixon Ridge Farms

study site
Study site
  • Established in June 2010 at Dixon Ridge Farm
  • Area: 12 acres
  • 4 treatments with 3 replicates each
  • Compost and cover crop

Tree Row

Tractor Row

Sampling Locations:

experimental approach
Experimental Approach

GHG emissions

(CO2 and N2O)

Soil moisture content

Biochar

+

Soil

Soil mineral N

Soil structure

(aggregation)

Soil microorganisms

Soil pH

soil structure aggregation
Soil structure: Aggregation

Key properties

Aggregates -> Protected fractions: C sequestration

Maintenance of soil moisture and aeration

Soil microorganisms

Silt and Clay

(< 53 μm)

Microaggregates

(53 - 250 μm)

Small Macroaggregates

(250 - 2000 μm)

Large Macroaggregates

(> 2000 μm)

biochar and soil aggregates
Biochar and soil aggregates
  • Due to surface charge, biochar may promote soil aggregation
  • This mechanism may increase C sequestration
slide9

Large Macroaggregates (> 2000 μm)

Small Macroaggregates (250 - 2000 μm)

slide10

Microaggregates (53 - 250 μm)

Silt and Clay (< 53 μm) - Unaggregated

biochar and soil aggregates1
Biochar and soil aggregates
  • Biochar did increase soil aggregation when combined to compost during the first year of study;
  • During the second year of observations, macroaggregates were disrupted, freeing microaggregates and silt and clay particles.
  • In conclusion, in this study biochar did not sustain an increase in soil aggregation and therefore additional C sequestration.
potential to reduce n 2 o emissions
Potential to reduce N2O emissions

60%

By increasing soil CEC,biochar will lead to NH4+ adsorption and prevention of nitrification.

N2O

N2O

N2

NO3-

NH4+

Nitrification

Biochar

Denitrification

Leaching

n 2 o sampling
N2O sampling
  • Samplings happen once a week
  • Or, for 7 days after an event (Irrigation, fertilization, precipitation).

Tree Row

Tractor Row

n 2 o emissions 1st year
N2O emissions – 1st year

Tree Row

Control

Biochar

Tractor Row

link with n 2 o consumers
Link with N2O consumers
  • Pot trial study using walnut shell biochar
  • Extraction of microbial DNA
  • qPCR: Quantification of functional genes
  • N2O reduction to N2

amoA

nirS

nosZ

NO

N2O

N2

NH4+

NO3-

NO2-

nirK

N2O

producers

N2O

consumers

concluding remarks
Concluding Remarks
  • Decreases in N2O emissions, when observed, happen after wet events (irrigation or precipitation) and in the tree row
  • Such decreases may be associated to an increase in the bacterial abundance that performs the reduction of N2O to N2
  • Biochar closes the loop at Dixon Ridge Farm with economic and environmental benefits.
acknowledgements
Acknowledgements
  • California Energy Commission
  • CNPq - Brazil
  • Six lab members, in special to Rafaela Conz, Garret Heinz and NeeleHolzenkaempfer