Heterotrophic Respiration and the Divergence of Productivity and Carbon Sequestration

被引：9

作者：

Noormets, Asko ^{[1
]}

Bracho, Rosvel ^{[2
]}

Ward, Eric ^{[3
]}

Seiler, John ^{[4
]}

Strahm, Brian ^{[4
]}

Lin, Wen ^{[5
]}

McElligott, Kristin ^{[4
]}

Domec, Jean-Christophe ^{[7
]}

Gonzalez-Benecke, Carlos ^{[8
]}

Jokela, Eric J. ^{[2
]}

Markewitz, Daniel ^{[6
]}

Meek, Cassandra ^{[9
]}

Miao, Guofang ^{[10
]}

McNulty, Steve G. ^{[11
]}

King, John S. ^{[12
]}

Samuelson, Lisa ^{[13
]}

Sun, Ge ^{[11
]}

Teskey, Robert ^{[6
]}

Vogel, Jason ^{[2
]}

Will, Rodney ^{[9
]}

Yang, Jinyan ^{[14
]}

Martin, Timothy A. ^{[2
]}

机构：

[1] Texas A&M Univ, Dept Ecol & Conservat Biol, College Stn, TX 77834 USA

[2] Univ Florida, Sch Forest Resources & Conservat, Gainesville, FL 32611 USA

[3] US Geol Survey, Lafayette, LA USA

[4] Virginia Tech, Dept Forest Resources & Environm Conservat, Blacksburg, VA USA

[5] Shenzhen Univ, Coll Life Sci & Oceanog, Shenzhen, Guangdong, Peoples R China

[6] Univ Georgia, Warnell Sch Forestry & Nat Resources, Athens, GA 30602 USA

[7] Bordeaux Sci Agro, Gradignan, France

[8] Oregon State Univ, Dept Forest Engn Resources & Management, Corvallis, OR 97331 USA

[9] Oklahoma State Univ, Dept Nat Resource Ecol & Management, Stillwater, OK 74078 USA

[10] Fujian Normal Univ, Sch Geog Sci, Fuzhou, Fujian, Peoples R China

[11] US Forest Serv, Eastern Forest Environm Threat Assessment Ctr, USDA, Res Triangle Pk, NC USA

[12] North Carolina State Univ, Dept Forestry & Environm Resources, Raleigh, NC USA

[13] Auburn Univ, Sch Forestry & Wildlife Sci, Auburn, AL 36849 USA

[14] Nanjing Forestry Univ, Coll Biol & Environm, Nanjing, Peoples R China

来源：

GEOPHYSICAL RESEARCH LETTERS | 2021年 / 48卷 / 07期

基金：

美国食品与农业研究所;

关键词：

carbon sequestration; drought; fertilization; heterotrophic respiration; net ecosystem production; net primary production; NET PRIMARY PRODUCTION; LOBLOLLY-PINE; SOIL RESPIRATION; AUTOTROPHIC RESPIRATION; MYCORRHIZAL RESPONSES; WATER-USE; DROUGHT; FOREST; FERTILIZATION; NITROGEN;

D O I：

10.1029/2020GL092366

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

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.

引用

页数：10

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