Fine root production in a chronosequence of mature reforested mangroves

Marie Arnaud; Paul J Morris; Andy J Baird; Huyen Dang; Tai Tue Nguyen

doi:10.1111/nph.17480

Fine root production in a chronosequence of mature reforested mangroves

Marie Arnaud, Paul J Morris, Andy J Baird, Huyen Dang, Tai Tue Nguyen

Research output: Contribution to journal › Article › peer-review

260 Downloads (Pure)

Abstract

Mangroves are among the world's most carbon-dense ecosystems, but have suffered extensive deforestation, prompting reforestation projects. The effects of mangrove reforestation on belowground carbon dynamics are poorly understood. In particular, we do not know how fine root production develops following mangrove reforestation, despite fine root production being a major carbon sink and an important control of mangrove soil accretion. Using minirhizotrons, we investigated fine root production and its depth variation along a chronosequence of mature Vietnamese mangroves. Our results showed that fine root production decreases strongly with stand age in the uppermost 32 cm of our soil profiles. In younger mangrove stands, fine root production declines with depth, possibly due to a vertical gradient in soil nutrient availability; while root production in the oldest stand is low at all depths and exhibits no clear vertical pattern. A major fraction of fine root production occurs deeper than 30 cm, depths that are commonly omitted from calculations of mangrove carbon budgets. Younger mangroves may accrue shallow soil organic matter faster than older mangroves. Therefore, root productivity and forest stand age should be accounted for when forecasting mangrove carbon budgets and resistance to sea-level rise.

Original language	English
Pages (from-to)	1591-1602
Number of pages	12
Journal	New Phytologist
Volume	232
Issue number	4
Early online date	21 May 2021
DOIs	https://doi.org/10.1111/nph.17480
Publication status	Published - Nov 2021

Bibliographical note

Funding Information:
The processing and the analysis of the data, as well as writing the manuscript were self‐funded by M. Arnaud. This research received funding from National Geographic (CP134ER‐17), the Royal Geographical Society with the Institute of British Geographers, the Estuarine & Coastal Sciences Association (Charles Boyden Fund), and the University of Leeds (International Mobility Grant, Climate Bursary Grant and Leeds University PhD Scholarship), all awarded to M. Arnaud. We thank David Ashley from the School of Geography at the University of Leeds for his help with the laboratory analysis and instrumentation support. We also thank the students and staff of the Vietnamese National University of Ho Chí Minh City for their support in the field. The management committee and staff of the Cần Giờ Park gave permission for access to, and use of, the field site and are thanked for their support during the field work, especially Mr Nghia, Mr Sinh, Mr Hung, Mr Hoan, Mr Sang and Mr Kiet.

Publisher Copyright:
© 2021 The Authors. New Phytologist © 2021 New Phytologist Foundation

Keywords

EnRoot minirhizotron
belowground carbon
blue carbon
coastal wetland
fine root production
reforestation
restoration
root trait

ASJC Scopus subject areas

Physiology
Plant Science

Access to Document

10.1111/nph.17480Licence: Creative Commons: Attribution (CC BY)

nph.17480Final published version, 1.56 MBLicence: Creative Commons: Attribution (CC BY)

Cite this

@article{410b60315eae459ba30d37c1f468c17f,

title = "Fine root production in a chronosequence of mature reforested mangroves",

abstract = "Mangroves are among the world's most carbon-dense ecosystems, but have suffered extensive deforestation, prompting reforestation projects. The effects of mangrove reforestation on belowground carbon dynamics are poorly understood. In particular, we do not know how fine root production develops following mangrove reforestation, despite fine root production being a major carbon sink and an important control of mangrove soil accretion. Using minirhizotrons, we investigated fine root production and its depth variation along a chronosequence of mature Vietnamese mangroves. Our results showed that fine root production decreases strongly with stand age in the uppermost 32 cm of our soil profiles. In younger mangrove stands, fine root production declines with depth, possibly due to a vertical gradient in soil nutrient availability; while root production in the oldest stand is low at all depths and exhibits no clear vertical pattern. A major fraction of fine root production occurs deeper than 30 cm, depths that are commonly omitted from calculations of mangrove carbon budgets. Younger mangroves may accrue shallow soil organic matter faster than older mangroves. Therefore, root productivity and forest stand age should be accounted for when forecasting mangrove carbon budgets and resistance to sea-level rise.",

keywords = "EnRoot minirhizotron, belowground carbon, blue carbon, coastal wetland, fine root production, reforestation, restoration, root trait",

author = "Marie Arnaud and Morris, {Paul J} and Baird, {Andy J} and Huyen Dang and Nguyen, {Tai Tue}",

note = "Funding Information: The processing and the analysis of the data, as well as writing the manuscript were self‐funded by M. Arnaud. This research received funding from National Geographic (CP134ER‐17), the Royal Geographical Society with the Institute of British Geographers, the Estuarine & Coastal Sciences Association (Charles Boyden Fund), and the University of Leeds (International Mobility Grant, Climate Bursary Grant and Leeds University PhD Scholarship), all awarded to M. Arnaud. We thank David Ashley from the School of Geography at the University of Leeds for his help with the laboratory analysis and instrumentation support. We also thank the students and staff of the Vietnamese National University of Ho Ch{\'i} Minh City for their support in the field. The management committee and staff of the Cần Giờ Park gave permission for access to, and use of, the field site and are thanked for their support during the field work, especially Mr Nghia, Mr Sinh, Mr Hung, Mr Hoan, Mr Sang and Mr Kiet. Publisher Copyright: {\textcopyright} 2021 The Authors. New Phytologist {\textcopyright} 2021 New Phytologist Foundation",

year = "2021",

month = nov,

doi = "10.1111/nph.17480",

language = "English",

volume = "232",

pages = "1591--1602",

journal = "New Phytologist",

issn = "0028-646X",

publisher = "Wiley",

number = "4",

}

TY - JOUR

T1 - Fine root production in a chronosequence of mature reforested mangroves

AU - Arnaud, Marie

AU - Morris, Paul J

AU - Baird, Andy J

AU - Dang, Huyen

AU - Nguyen, Tai Tue

N1 - Funding Information: The processing and the analysis of the data, as well as writing the manuscript were self‐funded by M. Arnaud. This research received funding from National Geographic (CP134ER‐17), the Royal Geographical Society with the Institute of British Geographers, the Estuarine & Coastal Sciences Association (Charles Boyden Fund), and the University of Leeds (International Mobility Grant, Climate Bursary Grant and Leeds University PhD Scholarship), all awarded to M. Arnaud. We thank David Ashley from the School of Geography at the University of Leeds for his help with the laboratory analysis and instrumentation support. We also thank the students and staff of the Vietnamese National University of Ho Chí Minh City for their support in the field. The management committee and staff of the Cần Giờ Park gave permission for access to, and use of, the field site and are thanked for their support during the field work, especially Mr Nghia, Mr Sinh, Mr Hung, Mr Hoan, Mr Sang and Mr Kiet. Publisher Copyright: © 2021 The Authors. New Phytologist © 2021 New Phytologist Foundation

PY - 2021/11

Y1 - 2021/11

N2 - Mangroves are among the world's most carbon-dense ecosystems, but have suffered extensive deforestation, prompting reforestation projects. The effects of mangrove reforestation on belowground carbon dynamics are poorly understood. In particular, we do not know how fine root production develops following mangrove reforestation, despite fine root production being a major carbon sink and an important control of mangrove soil accretion. Using minirhizotrons, we investigated fine root production and its depth variation along a chronosequence of mature Vietnamese mangroves. Our results showed that fine root production decreases strongly with stand age in the uppermost 32 cm of our soil profiles. In younger mangrove stands, fine root production declines with depth, possibly due to a vertical gradient in soil nutrient availability; while root production in the oldest stand is low at all depths and exhibits no clear vertical pattern. A major fraction of fine root production occurs deeper than 30 cm, depths that are commonly omitted from calculations of mangrove carbon budgets. Younger mangroves may accrue shallow soil organic matter faster than older mangroves. Therefore, root productivity and forest stand age should be accounted for when forecasting mangrove carbon budgets and resistance to sea-level rise.

AB - Mangroves are among the world's most carbon-dense ecosystems, but have suffered extensive deforestation, prompting reforestation projects. The effects of mangrove reforestation on belowground carbon dynamics are poorly understood. In particular, we do not know how fine root production develops following mangrove reforestation, despite fine root production being a major carbon sink and an important control of mangrove soil accretion. Using minirhizotrons, we investigated fine root production and its depth variation along a chronosequence of mature Vietnamese mangroves. Our results showed that fine root production decreases strongly with stand age in the uppermost 32 cm of our soil profiles. In younger mangrove stands, fine root production declines with depth, possibly due to a vertical gradient in soil nutrient availability; while root production in the oldest stand is low at all depths and exhibits no clear vertical pattern. A major fraction of fine root production occurs deeper than 30 cm, depths that are commonly omitted from calculations of mangrove carbon budgets. Younger mangroves may accrue shallow soil organic matter faster than older mangroves. Therefore, root productivity and forest stand age should be accounted for when forecasting mangrove carbon budgets and resistance to sea-level rise.

KW - EnRoot minirhizotron

KW - belowground carbon

KW - blue carbon

KW - coastal wetland

KW - fine root production

KW - reforestation

KW - restoration

KW - root trait

UR - http://www.scopus.com/inward/record.url?scp=85111462213&partnerID=8YFLogxK

U2 - 10.1111/nph.17480

DO - 10.1111/nph.17480

M3 - Article

C2 - 34018616

SN - 0028-646X

VL - 232

SP - 1591

EP - 1602

JO - New Phytologist

JF - New Phytologist

IS - 4

ER -

Fine root production in a chronosequence of mature reforested mangroves

Abstract

Bibliographical note

Keywords

ASJC Scopus subject areas

Access to Document

Fingerprint

Cite this