Canopy and understory nitrogen addition have different effects on fine root dynamics in a temperate forest implications for soil carbon storage

Canopy and understory nitrogen addition have different effects on fine root dynamics in a temperate forest : implications for soil carbon storage

© 2021 The Authors New Phytologist © 2021 New Phytologist Foundation.

Bibliographische Detailangaben
Veröffentlicht in:The New phytologist. - 1979. - 231(2021), 4 vom: 26. Aug., Seite 1377-1386
1. Verfasser: Li, Xiaowei (VerfasserIn)
Weitere Verfasser: Zhang, Chenlu, Zhang, Beibei, Wu, Di, Shi, Yifei, Zhang, Wei, Ye, Qing, Yan, Junhua, Fu, Juemin, Fang, Chengliang, Ha, Denglong, Fu, Shenglei
Format: Online-Aufsatz
Sprache:English
Veröffentlicht: 2021
Zugriff auf das übergeordnete Werk:The New phytologist
Schlagworte:Journal Article Research Support, Non-U.S. Gov't canopy nitrogen (N) input fine roots forests soil carbon (C) storage understory N input Soil Carbon 7440-44-0 mehr... Nitrogen N762921K75
Beschreibung
Zusammenfassung:© 2021 The Authors New Phytologist © 2021 New Phytologist Foundation.
Elucidating the effects of atmospheric nitrogen (N) deposition on fine root dynamics and the potential underlying mechanisms is required to understand the changes in belowground and aboveground carbon storage. However, research on these effects in forests has mostly involved direct understory addition of N and has ignored canopy interception and processing of N. Here, we conducted a field experiment comparing the effects of canopy addition of N (CAN) with those of understory addition of N (UAN) at three N-addition rates (0, 25 and 50 kg N ha-1  yr-1 ) on fine root dynamics in a temperate deciduous forest. Fine root production and biomass were significantly higher with CAN than with UAN. At the same N-addition rate, increases in fine root production with CAN were at least two-fold greater than with UAN. At the high N-addition rate and relative to the control, fine root biomass was significantly increased by CAN (by 23.5%) but was significantly decreased by UAN (by 12.2%). Our results indicate that traditional UAN may underestimate the responses of fine root dynamics to atmospheric N deposition in forest ecosystems. Canopy N processes should be considered for more realistic assessments of the effects of atmospheric N deposition in forests
Beschreibung:Date Completed 21.07.2021
Date Revised 21.07.2021
published: Print-Electronic
figshare: 10.6084/m9.figshare.14361587
Citation Status MEDLINE
ISSN:1469-8137
DOI:10.1111/nph.17460