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CARBON SEQUESTRATION BY HYBRID POPLARS IN THE PACIFIC NORTHWEST

CARBON SEQUESTRATION BY HYBRID POPLARS IN THE PACIFIC NORTHWEST. Dr. Jon D. Johnson Hybrid Poplar Research Program Washington State University - Puyallup Research & Extension Center, Puyallup, Washington poplar@wsu.edu www.puyallup.wsu.edu/poplar.

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CARBON SEQUESTRATION BY HYBRID POPLARS IN THE PACIFIC NORTHWEST

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  1. CARBON SEQUESTRATION BY HYBRID POPLARS IN THE PACIFIC NORTHWEST Dr. Jon D. Johnson Hybrid Poplar Research Program Washington State University - Puyallup Research & Extension Center, Puyallup, Washington poplar@wsu.edu www.puyallup.wsu.edu/poplar

  2. Overview • Funded by DOE SBIR through Broadacres Nursery, Hubbard, OR • Objectives • Determine above- and below-ground carbon sequestration rates for commercial hybrids during an 8 year plantation cycle. • Quantify changes in soil carbon as related to plantation development and vegetation. • With carbon sequestration, biomass and morphometric data from 1. develop and validate a field method for estimating carbon sequestration rates for hybrid poplar.

  3. Why Hybrid Poplar? • Fast growing • Straight stems • Dioecious (male and female trees) • Easily propagated

  4. 18 month old tree in Central Valley of California

  5. Methods • 3 clones growing in eastern Oregon: 184-411, 52-225, OP-367 • 4 ages: 2, 4, (5), 6 and 8 years old • 2 clones growing in western Oregon: 184-411, 52-225 • 3 ages: 5, 6, and years old • 5 trees per clone-age class • Above ground biomass & carbon • Below ground biomass & carbon • Soil carbon at 0-30 and 30-100 cm • Fractionated soil C

  6. Sand Silty clay loam Site Locations + Hermiston + Dallas West East

  7. Above-ground Sampling Standing trees were measured for height and diameter; After felling, stems and branches were processed by whorl All tree parts were weighed in the field and subsamples taken for dry weight conversion and carbon content

  8. Below-ground Sampling Stumps were excavated and then roots were separated from stump; each weighed separately and subsamples were taken for dry weight conversion and carbon content

  9. Tree Carbon Distribution 103.7 95.4 77.9 53.3 33.9 28.1 24.3 24 6.4 7.4 6.4

  10. Carbon Sequestration Rates Total C

  11. 11.9 18.3 146.4 9.7 14.9 119.2 13.0 20.0 160.0 7.5 11.5 92.0 7.3 11.2 89.6 Summary – Mean Annual Sequestration Rate Clone/Location Total tree C (Kg/y) Total C (Mg/ha/y) Total C @ 8 y (Mg/ha) 52-225 E 184-411 E OP-367 E 15-29 W 52-225 W

  12. Soil Sampling • 6 samples/tree (pooled); 5 trees /clone • 2 depths: 0-30 and 30-100 cm • Adjacent fields sampled: crop and native vegetation (E) • Fine roots removed, dried andweighed • Boiling water extraction to estimate labile soil C (E)

  13. Soil Carbon

  14. Labile Soil Carbon (E)

  15. 2 R = 0.9768 2 R = 0.9763 Tree Carbon Volume Predicting Tree Carbon Total C Aboveground C

  16. Conclusions • Hybrid poplars are capable of sequestering high amounts of C • Soil C increased significantly in hybrid poplar plantations when compared to adjacent crop land (7-82% depending on soil texture) • Over time, the proportion of labile soil C decreased • Standing tree C can be predicted with easy to measure parameters allowing for third party verification of C storage

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