Scientists & Staff
Climate, Fire, and Carbon Cycle Sciences
11 Campus Blvd. Ste. 200
Newtown Square, Pennsylvania 19073
1. Validating a LIDAR-based Carbon Monitoring System with FIA data. High resolution biomass maps can help identify areas that have the potential to store, or lose, terrestrial carbon. This project focuses on comparing biomass maps with FIA data for the whole state of Maryland, and methods for integrating these two resources. Funded by NASA and in collaboration with the University of Maryland.
2. Comparing mapped soil carbon estimates to process-based outputs in Alaska. Alaska is relatively data-rich in terms of soil carbon observations compared to other areas in the boreal and arctic zones, yet it is still data-poor compared to other temperate and tropical areas in the world. The question remains of how soil carbon uncertainty may influence model results, especially those concerned with predicting the response of northern regions to climate change. Funded by USGS and in collaboration with the University of Alaska Fairbanks.
3. Assessing the effects of soil map quality on carbon modeling results and scaling in Mexico. The quality of soil maps used in process-based ecosystem models is not the same for all countries and may significantly impact model results. In this study, we are simulating GPP at several 9 km2 areas in Mexico and comparing the results using soil maps of different quality and resolution. Funded by NASA and in collaboration with the University of Delaware.
Other activities. Our research unit also helps coordinate training workshops where forest carbon measurement methods are presented, mostly in Mexico but also in other latin american countries.
- University of Pennsylvania, Ph.D. Earth Science, 2008
- Brigham Young University, M.S. Agronomy, 2004
- Brigham Young University, B.S. Agronomy, 2002
- American Geophysical Union
- Geological Society of America
- American Society of Agronomy
Featured Publications & Products
- Johnson, Kristofer D.; Birdsey, Richard; Cole, Jason; Swatantran, Anu; O'Neil-Dunne, Jarlath; Dubayah, Ralph; Lister, Andrew. 2015. Integrating LIDAR and forest inventories to fill the trees outside forests data gap. Environmental Monitoring and Assessment. 187:623. DOI: 10.1007/s10661-015-4839-1.
- Johnson, Kristofer D.; Harden, Jennifer W.; McGuire, A. David; Clark, Mark; Yuan, Fengming; Finley, Andrew O. 2013. Permafrost and organic layer interactions over a climate gradient in a discontinuous permafrost zone. Environmental Research Letters. 8(3): 035028.
Publications & Products
- Dai, Z.; Johnson, K.D.; Birdsey, R.A.; Hernandez-Stefanoni, J.L.; Dupuy, J.M. 2015. Assessing the effect of climate change on carbon sequestration in a Mexican dry forest in the Yucatan Peninsula. Ecological Complexity. 24: 46-56.
- Huang, Wenli; Swatantran, Anu; Johnson, Kristofer; Duncanson, Laura; Tang, Hao; O'Neil Dunne, Jarlath; Hurtt, George; Dubayah, Ralph. 2015. Local discrepancies in continental scale biomass maps: a case study over forested and non-forested landscapes in Maryland, USA. Carbon Balance and Management. 10(1): 19. [16 p.].
- Johnson, Kristofer D.; Birdsey, Richard; O Finley, Andrew; Swantaran, Anu; Dubayah, Ralph; Wayson, Craig; Riemann, Rachel. 2014. Integrating forest inventory and analysis data into a LIDAR-based carbon monitoring system. Carbon Balance and Management. 9(3): 3.
- Dai, Zhaohua; Birdsey, Richard A.; Johnson, Kristofer D.; Dupuy, Juan Manuel; Hernandez-Stefanoni, Jose Luis; Richardson, Karen. 2014. Modeling carbon stocks in a secondary tropical dry forest in the Yucatan Peninsula, Mexico. Water, Air, & Soil Pollution. 225(4):1-15.
- Birdsey, Richard; Angeles-Perez, Gregorio; Kurz, Werner A; Lister, Andrew; Olguin, Marcela; Pan, Yude; Wayson, Craig; Wilson, Barry; Johnson, Kristofer. 2013. Approaches to monitoring changes in carbon stocks for REDD+. Carbon Management. 4(5): 519-537.
- Cole, Jason A.; Johnson, Kristopher D.; Birdsey, Richard A.; Pan, Yude; Wayson, Craig A.; McCullough, Kevin; Hoover, Coeli M.; Hollinger, David Y.; Bradford, John B.; Ryan, Michael G.; Kolka, Randall K.; Wieshampel, Peter; Clark, Kenneth L.; Skowronski, Nicholas S.; Hom, John; Ollinger, Scott V.; McNulty, Steven G.; Gavazzi, Michael J. 2013. Database for landscape-scale carbon monitoring sites. Gen. Tech. Rep. NRS-119. Newtown square, PA: U.S. Department of Agriculture, Forest Service, Northern Research Station. 12 p.
- Johnson, Kristofer D.; Scatena, F.N.; Silver, Whendee L. 2011. Atypical soil carbon distribution across a tropical steepland forest catena. Catena. 87: 391-397. .
- Johnson, Kristofer D.; Harden, Jennifer; McGuire, A. David; Bliss, Norman B.; Bockheim, James G.; Clark, Mark; Nettleton-Hollingsworth, Teresa; Jorgenson, M. Torre; Kane, Evan S.; Mack, Michelle; ODonnell, Johathan; Ping, Chien-Lu; Schuur, Edward A.G.; Turetsky, Merritt R.; Valentine, David W. 2011. Soil carbon distribution in Alaska in relation to soil-forming factors. Geoderma. 167-168: 71-84.
- Johnson, K.; Scatena, F. N.; Pan, Y. 2010. Short- and long-term responses of total soil organic carbon to harvesting in a northern hardwood forest. Forest Ecology and Management. 259(7): 1262-1267.
- Johnson, K.D.; Scatena, F.N.; Johnson, A.H.; Pan, Y. 2009. Controls on soil organic matter content within a northern hardwood forest. Geoderma. 148(3-4): 346-356.
National Research Highlights
How to Build a Better Map of Tree Biomass (2014)
A logical way to validate biomass maps derived from remotely sensed data is to validate them with independent ground inventory estimates, but integration of the two systems is not without challenges. Forest Service scientists compared maps derived from Light Detection and Ranging (LIDAR) to Forest Inventory and Analysis (FIA) estimates in the fragmented forests of Maryland, leading to recommendations about how to improve their agreement.