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HERO ID
3857758
Reference Type
Journal Article
Title
Nitrogen addition increases the production and turnover of the lower-order roots but not of the higher-order roots of Bothriochloa ischaemum
Author(s)
Wang, G; Xue, S; Liu, F; Liu, G
Year
2017
Is Peer Reviewed?
1
Journal
Plant and Soil
ISSN:
0032-079X
EISSN:
1573-5036
Volume
415
Issue
1-2
Page Numbers
423-434
Language
English
DOI
10.1007/s11104-016-3160-2
Web of Science Id
WOS:000403495500031
Abstract
Global nitrogen deposition alters grassland ecosystems. Whether added nitrogen changes root production and turnover by root orders is unclear.
We compared the root dynamics across four root orders of Bothriochloa ischaemum treated with nitrogen addition (0-10 g N m(-2) year(-1)).
The higher order roots exhibited lower production, turnover, number, length, and biomass, indicating a hierarchical system of B. ischaemum. At whole root system level, nitrogen addition increased length production, biomass production and turnover. At root order level, nitrogen addition increased length production, biomass production, and turnover of the first two order roots but not of the third- and fourth-order roots. Nitrogen addition reduced root biomass, and the belowground to aboveground biomass ratio, supporting the functional equilibrium hypothesis. The increased root production, turnover and decreased root number, length and biomass were mainly attributed to the increasing ammonium and nitrate nitrogen.
Nitrogen addition increased the length production (7-30%), biomass production (10-34%) and turnover (8-35%) of the first two order roots but not of the higher order roots compared with the control pots. The discrepancy in root characteristics and their responses to nitrogen availability among root orders should be considered in establishing root dynamic models.
Keywords
Grass; Nitrogen deposition; Production; Root dynamic; Root order; Turnover
Tags
IRIS
•
Nitrate/Nitrite
Broad LitSearch 2016/1/1 - 2017/12/5
Refs found by LitSearch but not ATSDR/IARC
WoS
Refs found only by 2017 LitSearch or Citation Mapping
Ref Types 12/2017
All Others
LitSearch Update 2016-2017
WoS
NAAQS
•
ISA NOxSOxPM Ecology (2018)
Cited in the Second Draft
Appendix 6
•
ISA NOxSOxPM Ecology (2020- Final Project Page)
Cited
Appendix 6
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