I am an ecosystem ecologist interested in
•  Effects of CO₂ enrichment on tree growth and forest metabolism
•  Ecosystem responses to atmospheric and climatic change
•  Carbon and nitrogen cycling in diverse ecosystems
•  Forest tree physiology and plant physiological ecology
•  Synthesis of experimental results to inform models

New publication:

Yaffar D, Defrenne CE, Cabugao KG, Kivlin SN, Childs J, Carvajal N, Norby RJ. 2021.Trade-offs in phosphorus acquisition strategies of five common tree species in a tropical forest of Puerto Rico. Frontiers in Forests and Global Change. 10.3389/ffgc.2021.698191

Recent projects include:

Free Air CO₂ Enrichment (FACE) experiment (link)

Norby RJ, Warren JM, Iversen CM, Medlyn BE, McMurtrie RE. 2010. CO₂ enhancement of forest productivity constrained by limited nitrogen availability. Proceedings of the National Academy of Sciences 107: 19368-19373. 10.1073/pnas.1006463107

FACE Model-Data Synthesis (link)

Walker AP, De Kauwe MG, Medlyn BE, Zaehle S, Iversen CM, Asao S, Guenet B, Harper A, Hickler T, Hungate BA, Jain AK, Luo Y, Lu X, Lu M, Luus K, Megonigal JP, Oren R, Ryan E, Shu S, Talhelm A, Wang Y-P, Warren JM, Werner C, Xia J, Yang B, Zak DR, Norby RJ. 2019. Decadal biomass increment in early secondary succession woody ecosystems is increased by CO₂ enrichment. Nature Communications 10: 454. 10.1038/s41467-019-08348-1

AmazonFACE Experiment (link)

Cordeiro AL, Norby RJ, Andersen KM, Valverde-Barrantes O, Fuchslueger L, Oblitas E, Hartley IP, Iversen CM, Goncalves NB, Takeshi B, Lapola DM, Quesada CA.2020. Fine-root dynamics vary with soil depth and precipitation in a low nutrient tropical forest in the Central Amazonia. Plant-Environment Interactions 1:3-16. 10.1002/pei3.10010

Root-Soil interface in Puerto Rico, part of NGEE-Tropics (link)

Cabugao KG, Yaffar D, Stenson N, Childs J, Phillips J, Mayes MA, Yang X, Weston DJ, Norby RJ. 2021. Bringing function to structure: Root-soil interactions shaping phosphatase activity throughout a soil profile in Puerto Rico. Ecology and Evolution 11: 1150-1164, 10.1002/ece3.7036

Yaffar D, Norby RJ. A historical and comparative review of 50 years of root data collection in Puerto Rico. Biotropica 52: 563-576. 10.1111/btp.12771

Sphagnum research at SPRUCE experiment (link)

Norby RJ, Childs J, Hanson PJ, Warren JM. 2019. Rapid loss of an ecosystem engineer: Sphagnum decline in an experimentally warmed bog. Ecology and Evolution 9:12571-12585. 10.1002/ece3.5722.