Biomass and Carbon Residence Time Estimation by Remote

Biomass and Carbon Residence Time Estimation by Remote Sensing and Direct Measurements at the Santa Rita Experimental Research Station Theodore Jones University of Arizona Space Grant Intern Joel Biederman, Russ Scott USDA Agricultural Research Service 1

Why Measure Carbon Residence Time? Above Ground Biomass Below Ground Biomas s 2 � tr= carbon stored / photosynthesis � role of an ecosystem in climate change � stored carbon can account for decades worth of photosynthesis � changes in the environment can release quickly

Santa Rita Experimental Research Station Flux Tower Site 3

Measuring Biomass = carbon contained in the plants Allometric Relationships Tree crown areas (Aerial photographs) Percent Cover Estimates 4 Manual Measurements B i o m a s Diameter/Height s LIDAR/Wavelet Method Based Height

Aerial Photo-based Methods Visual photography Percent of the terrain covered by vegetation 5 Bare soil Tree Mixed/gras s Flux tower Estimates of individual tree crown areas tree canopy

Airborne Li. DAR Method Lidar Dataset Wavelet Method Results (Swetnam et. al. 2014) 6

Biomass Density Estimates (in kg/m²) 4 B i o m 3 a s s 2 1 0 Manual Transects Percent Cover Crown Areas LIDAR (Wavelet Method) Biomass estimation method 7

Total Biomass and Residence Times Above ground biomass --1. 7 kg m 2 to 3. 1 kg m 2 Below Ground Biomass 0. 82 kg m 2 Input Photosynthesis 0. 3 kg/m 2 per year 8 Mean Carbon Residence Time 25 to 35 years tr= carbon stored / photosynthesis

Conclusions � The estimated biomass varies from 1. 7 kg/m^2 to 3. 1 kg/m^2 among the methods. � Mean carbon residence time is 25. 4 to 34. 6 years in spite of 45% uncertainty in aboveground biomass � Future steps for this project will include: estimating the biomass of understory plants � expanding the analysis to other sites and ecosystem types � 9

Biomass and Carbon Residence Time Estimation by Remote Sensing and Direct Measurements at the Santa Rita Experimental Research Station Theodore Jones University of Arizona tjones 2@email. arizona. edu 10