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Effects of Forest Management on Carbon Flux and Storage. Jiquan Chen, Randy Jensen, Qinglin Li, Rachel Henderson & Jianye Xu University of Toledo & Missouri Department of Conservation. A Few Relevant Advancements in Carbon Study

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slide1

Effects of Forest Management on Carbon Flux and Storage

Jiquan Chen, Randy Jensen, Qinglin Li, Rachel Henderson & Jianye Xu

University of Toledo &

Missouri Department of Conservation

slide2

A Few Relevant Advancements in Carbon Study

  • Global warming associated with human activities is much greater than the portion associated with greenhouse gases (GHG);
  • Carbon sequestration strength varies with management (e.g., harvesting, fertilization), climate and natural disturbances, but no widely accepted models for managers;
  • Respiratory carbon loss dominates over the carbon gain through photosynthesis;
  • Retention of green trees during harvests might prevent a stand from being a carbon source.
slide3

Qs?

Autotrophic respiration

Leaf gross photosynthesis

Net ecosystem exchange

Leaf net photosynthesis

Leaf respiration

Photorespiration

Stem respiration

Gross primary production

Net primary production

Root & mycorrhizal respiration

Leaf litter respiration

CWD respiration

Heterotrophic soil respiration

Heterotrophic respiration

Soil surface CO2 efflux

Ecosystem Carbon Fluxes

Atmosphere

Photo-tissue

Non-photo-tissue

CWD

Leaf litter

Soil

Roots

Modified from Gifford (2003) by Li & Chen

slide4

Annual Carbon Storage in N. Hemisphere Forests

Gough et al. (2008), Bioscience

slide5

Growing season NEP for comparable pine ecosystems of various age classes – results of a meta-analysis

Euskirchen, Pregitzer & Chen (2006), JGR

Gough et al. (2008), Bioscience

slide6

Effects of clearcut and fire on annual carbon storage by site index at UMBS

Gough et al. (2008), Bioscience

slide9

Changes in elevated respiration rate (%) at MOFEP compartment, showing rapid diminish trends.

EAM

Difference from the Refs (%)

UAM

Year

slide13

Mean respiration (percentage) of different components at the three treatments

unit: Kg CO2.ha-2.yr-1

slide14

Soil respiration not an exponential function of soil temperature – complex regulations!

Reduction in photosynthesis (C-gain) at higher VPD (Temperature) will also reduce respiratory C loss!

slide15

Change in NEE in comparison to low-VPD conditions as a function of VPD at midday.

Noormets et al. (2008), New Phytologists

slide16

Summer respiration (C loss) is linearly related to annual/winter precipitation in California’s Serra Nevada.

Concilio et al. (2008), Clim. Change.

relationship between soil respiration temperature

Ms > 15%.

5 ~ 15%.

< 5%.

Relationship between soil respiration & temperature
  • SRR was positively related to Ts5 when Ms >15%.
  • The positive relationship changed to the negative when Ms <5%.

Clearly, water and other resource use and biophyscial environmental variable can alter the conventional Q10 predictions.

Ma et al. (2004), For. Sci.

slide18

Challenges For Managing Ozark Forests

  • Understand the long-term dynamics of carbon fluxes and regulative mechanisms as climate, species composition, and management practices will be agile;
  • Link management options directly to carbon storage and fluxes (i.e., credit) in adaptation plans (e.g., climate change and societal needs);
  • Examine the C credits and sequestration of Ozark forests in context of overall ecosystem functions and services.