| Title: |
Heterotrophic Respiration and the Divergence of Productivity and Carbon Sequestration ; Geophysical Research Letters |
| Authors: |
Noormets, Asko; Bracho, Rosvel; Ward, Eric J.; Seiler, John R.; Strahm, Brian D.; Lin, Wen; McElligott, Kristin M.; Domec, Jean-Christophe; González-Benecke, Carlos; Jokela, Eric J.; Markewitz, Daniel; Meek, Cassandra; Miao, Guofang; McNulty, Steve G.; King, John S.; Samuelson, Lisa; Sun, Ge; Teskey, Robert O.; Vogel, Jason G.; Will, Rodney E.; Yang, Jinyan; Martin, Timothy A. |
| Contributors: |
Forest Resources and Environmental Conservation |
| Publication Year: |
2021 |
| Collection: |
VTechWorks (VirginiaTech) |
| Subject Terms: |
carbon sequestration; drought; fertilization; heterotrophic respiration; net ecosystem production; net primary production |
| Description: |
Net primary productivity (NPP) and net ecosystem production (NEP) are often used interchangeably, as their difference, heterotrophic respiration (soil heterotrophic CO2 efflux, R-SH = NPP-NEP), is assumed a near-fixed fraction of NPP. Here, we show, using a range-wide replicated experimental study in loblolly pine (Pinus taeda) plantations that R-SH responds differently than NPP to fertilization and drought treatments, leading to the divergent responses of NPP and NEP. Across the natural range of the species, the moderate responses of NPP (+11%) and R-SH (-7%) to fertilization combined such that NEP increased nearly threefold in ambient control and 43% under drought treatment. A 13% decline in R-SH under drought led to a 26% increase in NEP while NPP was unaltered. Such drought benefit for carbon sequestration was nearly twofold in control, but disappeared under fertilization. Carbon sequestration efficiency, NEP:NPP, varied twofold among sites, and increased up to threefold under both drought and fertilization. ; USDA National Institute of Food and AgricultureUnited States Department of Agriculture (USDA) [2011-68002-30185]; US Forest Service Eastern Forest Environmental Threat Assessment Center [08-JV-11330147-038]; McIntire-Stennis Project [121209 94160] ; Published version ; This study was conducted as part of The Pine Integrated Network: Education, Mitigation, and Adaptation Project (PINEMAP) that was a Coordinated Agricultural Project funded by the USDA National Institute of Food and Agriculture, Award #2011-68002-30185. The authors thank Foley Timber and Land Company (Florida), Ed Hurliman (Oklahoma), and the Virginia Department of Forestry, Appomattox-Buckingham State Forest (Virginia) for providing property access to install the experiments. Partial support was provided by US Forest Service Eastern Forest Environmental Threat Assessment Center Grant 08-JV-11330147-038, and McIntire-Stennis Project 121209 94160. Any use of trade, firm, or product names is for descriptive purposes only and does not imply ... |
| Document Type: |
article in journal/newspaper; still image |
| File Description: |
application/pdf |
| Language: |
English |
| Relation: |
e2020GL092366; http://hdl.handle.net/10919/104081; https://doi.org/10.1029/2020GL092366; 48 |
| DOI: |
10.1029/2020GL092366 |
| Availability: |
http://hdl.handle.net/10919/104081; https://doi.org/10.1029/2020GL092366 |
| Rights: |
Public Domain ; http://creativecommons.org/publicdomain/mark/1.0/ |
| Accession Number: |
edsbas.58C21691 |
| Database: |
BASE |