University Distinguished Professor Department of Agronomy

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Presentation transcript:

University Distinguished Professor Department of Agronomy Greenhouse Gases: Soil Science, Terrestrial Sequestration, and Agricultural Offsets Charles W. Rice University Distinguished Professor Soil Microbiologist Department of Agronomy K-State Research and Extension

IPCC Fourth Assessment Report, Working Group III, 2007

Mitigation

7 wedges needed to reach stabilize carbon emissions Source: Socolow & Pacala; Sci. Am., Sept. 2006 4

Global economic mitigation potential for different sectors at different carbon prices IPCC, 2007

Agriculture A large proportion of the mitigation potential of agriculture (excluding bioenergy) arises from soil C sequestration, which has strong synergies with sustainable agriculture and generally reduces vulnerability to climate change. Agricultural practices collectively can make a significant contribution at low cost By increasing soil carbon sinks, By reducing GHG emissions, By contributing biomass feedstocks for energy use IPCC Fourth Assessment Report, Working Group III, 2007

Global mitigation potential in agriculture Cropland Management Water Management Rice Management Setaside LUC & Agroforestry Grazing land Management Restoration of Cultivated Organic Soils Restoration of Degraded Lands Bioenergy Crops (Soils Component) Livestock Manure Management Global biophysical mitigation potential (Mt CO2 seq. yr-1) N2O CH4 CO2 Global biophysical mitigation potential (Mt CO2 seq. yr-1) Smith et al. (2008)

Soil Microbial Activity Soil Organic Matter (C) Climate Soils Management CO2 Sunlight Harvestable Yield Soil Microbial Activity Soil Organic Matter (C)

Many opportunities for GHG mitigation! Cropland Reduced tillage Rotations Reduced bare fallow Increased intensity Cover crops Fertility management Nitrogen use efficiency Water management Irrigation management Reduced Tillage Fertilizer Management Diversifying rotations Dr. Rice, I don’t really have a good picture of crop rotations for increasing cropping intensity. Maybe you do? Here are some examples of these activities such as croplands, rice paddies and agroforestry. In general, the various practices under each activity can be defined with some precision and the general impact of the practice can on soil organic carbon can be quantified as well. But from a global and from site specific perspectives we need to improve our understanding of the impacts of these practices or the interactive effects of these practices on soil carbon stocks under a variety of climate-soil combinations. Take for example reduced tillage and its impact of erosion rates and soil carbon dynamics. In general, we know the answer how the system is going to behave but the intensity of the responses might be site specific. Smart irrigation technologies Hairy Vetch as a cover crop

Many opportunities for GHG mitigation! Grasslands Grazing management Fire management Fertilization Here are some examples of these activities such as croplands, rice paddies and agroforestry. In general, the various practices under each activity can be defined with some precision and the general impact of the practice can on soil organic carbon can be quantified as well. But from a global and from site specific perspectives we need to improve our understanding of the impacts of these practices or the interactive effects of these practices on soil carbon stocks under a variety of climate-soil combinations. Take for example reduced tillage and its impact of erosion rates and soil carbon dynamics. In general, we know the answer how the system is going to behave but the intensity of the responses might be site specific. Managed Grazing Controlled Burning

Conservation of Soil Carbon Microbial composition and activity H2O Organic C Temperature Microbial composition and activity O2 Management Plant characteristics Substrate quality Clay Hierarchy of importance Biological factors Physical Protection Disturbance The amount of C soils can sequester is dependent on several factors. First is the amount of C. Once that C enters the soil that of primary importance is microbial activity. Second is physical protection and finally chemical. I would like to illustrate a couple of examples. C inputs Organics Chemical Mineralogy Clay CO2

5 cm Fonte: Juca Sá No-till promotes fungal activity

Soil Aggregation Aggregate Size Class Macroaggregates Microaggregates 10 20 30 40 50 60 >2000 g aggregate 100 g-1 soil Restored prairie No-tillage Sorghum Tillage Sorghum <53 a ab b 53-250 250-2000 a* White and Rice, 2007

How long? How deep? How much? Cultivation New Management Soil C content

Ag and forestry have the potential to offset 10 - 25 percent of total annual U.S. GHG emissions

Environmental Services Soil Organic Carbon Microbial Activity Nutrient Cycling Structure Biodiversity Water Erosion & Availability Gaseous Emissions Plant Growth Yield Environmental Services Sustainability

Reduction Opportunities Sequestration Conservation tillage and crop rotations Cover crops Grazing practices Forestation, reforestation, forest management Avoided emissions Biofuel production Thermal bio-power and bio-heat Renewable electrical power Emission reductions Manure management Fertilizer practices N2O 21

Types of Agricultural & Forestry GHG Offset Transactions Outright Sale Direct GHG emissions reductions – N2O, CH4, CO2 Soil/Biomass Carbon – permanent commitment Term-Limited Lease Soil carbon storage Biomass storage 11/12/2018

Offsets Are Critical for Cap & Trade Induces Change in Uncapped Sectors Reduces Program Costs Produces Large Volumes Earlier Fills the Timing Gap; Bridges to the New Energy Future 23

24

Examples of feasibility and pilot projects on soil carbon sequestration Region Land Use Land management change Saskatchewan, Canada Cropland Direct seeding / cropping intensification Pacific Northwest, USA Midwest Iowa, Kansas Grass planting No-till New grass plantings Oaxaca, Mexico Crop / natural fallow secondary forest Fruit tree intercrops with annual crops / Conservation tillage Pampas, Argentina Direct seeding Kazakhstan Agriculture to grassland Izaurralde (2004), Rice

Carbon as a Revenue Crop

Primary Challenges Costs Changes in operating practices Tracking and selling offsets Increased input cost (esp. fuel and fertilizer) Getting the correct enabling policy in place Development of viable markets Informing ag and forest sectors of opportunities, challenges, alternatives and consequences Shaping our own destiny

Measurement, Monitoring and Verification Detecting soil C changes Difficult on short time scales Amount of change small compared to total C Methods for detecting and projecting soil C changes (Post et al. 2001) Direct methods Field measurements Indirect methods Accounting Stratified accounting Remote sensing Models Post et al. (2001)

Primary Challenges Costs Changes in operating practices Tracking and selling offsets Increased input cost (esp. fuel and fertilizer) Getting the correct enabling policy in place Development of viable markets Informing ag and forest sectors of opportunities, challenges, alternatives and consequences Shaping our own destiny

Production Costs Iowa State University of Missouri (FAPRI) Roughly a 1.5% increase for corn and soybean farmers by 2020 University of Missouri (FAPRI) Dryland corn 3.2% increase by 2020 Irrigated corn 3.5% increase by 2020 Soybeans 1.6% by 2020

Primary Challenges Costs Changes in operating practices Tracking and selling offsets Increased input cost (esp. fuel and fertilizer) Getting the correct enabling policy in place Development of viable markets Informing ag and forest sectors of opportunities, challenges, alternatives and consequences Shaping our own destiny

Policy State and Regional Policy National Policy International California Northeast Region 34 State Climate Action Registry (Kansas included) Western Governors Association Midwest Governors Association National Policy Farm Bill Many programs tie to offsets CSP, EQIP Voluntary Registry Climate Change Legislation (will ag be included) Cap and Trade Carbon Tax International Kyoto (EU has a trading platform) Partnerships

Waxman-Markey Bill Sets a cap on GHG emissions 17% reduction by 2020 83% reduction by 2050 Allows 2 billion tons of offsets Split equally between domestic and international sources Allocates ~86% of allowances Rural Cooperatives get a portion

Peterson Amendments Makes USDA responsible for managing the agricultural offset program Further specifies how the offset program will operate Provides protection for "early actors" Incorporates a list of practices that will be eligible for inclusion in the offset program Commodity Futures Trading Commission regulates the trading of derivatives for emission allowances, offset credits and renewable electricity credits

Conclusions: Mitigation Agriculture has a significant role to play in climate mitigation Agriculture is cost competitive with mitigation options in other sectors Bio-energy crops and improved energy efficiency in agriculture can contribute to further climate mitigation Agricultural mitigation should be part of a portfolio of mitigation measures to reduce emissions / increase sinks while new, low carbon energy technologies are developed.

Scientific American’s Vision of the Future Farm Scientific American, 2005

K-State Research and Extension Chuck Rice Phone: 785-532-7217 Cell: 785-587-7215 cwrice@ksu.edu Website www.soilcarboncenter.k-state.edu/ www.conservationinformation.org/powerpoint/rice_oct29.ppt K-State Research and Extension