Growth, morphological traits and mycorrhizal colonization of fine roots respond differently to nitrogen addition in a slash pine plantation in subtropical China
Kou, L; Guo, DL; Yang, H; Gao, WL; Li, SG
2015
Source PublicationPLANT AND SOIL
ISSN0032-079X
Volume391Issue:01-02Pages:207-218
AbstractBackground and aims Growth, morphological traits, and mycorrhizal colonization of fine roots show high degree of plasticity in response to changes in nutrient availability, causing shifts in root nutrient-foraging strategy. However, little is known about how this plasticity associated with root branching orders respond to atmospheric nitrogen (N) deposition in subtropical coniferous forests. Methods We used soil block sampling method to examine the responses of six key root functional parameters (including three morphological traits (specific root length (SRL), root tissue density (RTD), and root diameter), two growth indices (total root length (TRL) and biomass) on an areal basis across five root orders, and ectomycorrhizal (EM) tip colonization) to different doses and species of N addition in a slash pine (Pinus elliottii) plantation in subtropical China. Results TRL, root biomass in all root orders, and EM tip colonization increased significantly with N addition. However, SRL, RTD, and root diameter did not change in any root orders. In comparison to low doses of N input, high doses of N input exerted greater effects on lower-order roots. In regard to species of N added, stronger responses in lower-order roots were observed under ammonium-based than nitrated-based N input. Foliar P content was significantly decreased and stoichiometric N:P ratio was markedly increased in response to high dose of ammonium-based N input. Conclusions Fine root growth and EM tip colonization displayed higher degree of plasticity than morphological traits in response to N addition. The plastic responses were not root-order dependent, but dependent on both N dose and species, especially for ephemeral lower-order roots that are mostly like to be the main nutrient acquisition structures. Our results imply that while N limitation was alleviated by exogenous N input, P limitation may persist or even be exacerbated, thus causing an increase of absorptive root length, biomass, and dependence on ectomycorrhizae for nutrient acquisition in subtropical slash pine plantation forests.
SubtypeJournal
KeywordEctomycorrhizal tip colonization Fine root growth Morphological traits Nitrogen deposition Root branching order Stoichiometric ratio
Subject AreaAgriculture ; Plant Sciences
WOS Subject ExtendedAgronomy ; Plant Sciences ; Soil Science
WOS KeywordFORAGING STRATEGIES ; FOREST ECOSYSTEMS ; NORWAY SPRUCE ; LIFE-SPAN ; PLANTS ; PHOSPHORUS ; ARCHITECTURE ; SOIL ; ARABIDOPSIS ; COMPETITION
Indexed BySCI
Language英语
WOS IDWOS:000354197100015
PublisherSPRINGER
Citation statistics
Document Type期刊论文
Identifierhttp://ir.igsnrr.ac.cn/handle/311030/44416
Collection生态系统网络观测与模拟院重点实验室_生态网络实验室
Recommended Citation
GB/T 7714
Kou, L,Guo, DL,Yang, H,et al. Growth, morphological traits and mycorrhizal colonization of fine roots respond differently to nitrogen addition in a slash pine plantation in subtropical China[J]. PLANT AND SOIL,2015,391(01-02):207-218.
APA Kou, L,Guo, DL,Yang, H,Gao, WL,&Li, SG.(2015).Growth, morphological traits and mycorrhizal colonization of fine roots respond differently to nitrogen addition in a slash pine plantation in subtropical China.PLANT AND SOIL,391(01-02),207-218.
MLA Kou, L,et al."Growth, morphological traits and mycorrhizal colonization of fine roots respond differently to nitrogen addition in a slash pine plantation in subtropical China".PLANT AND SOIL 391.01-02(2015):207-218.
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