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Elaborate differences between trees and understory plants in the deployment of fine roots
Jiang, Peipei1,2; Wang, Huimin1,2,3; Fu, Xiaoli1,2,3; Dai, Xiaoqin1,2,3; Kou, Liang1,2,3; Wang, Junlong1,2
2018-10-01
Source PublicationPLANT AND SOIL
ISSN0032-079X
Volume431Issue:1-2Pages:433-447
Corresponding AuthorFu, Xiaoli(fuxl@igsnrr.ac.cn)
AbstractSpatially segregating root systems is a fundamental mechanism by which plants can avoid competition for resources. Understory roots contribute substantially to total forest fine-root biomass, but the strategy of function-based fine root placement between trees and understory species at the plant community level is unknown. The aim of this study was to determine the differences between trees and understory plants in the deployment of fine roots. We collected fine roots of trees and understory species in two subtropical coniferous forests, sorted the fine roots into absorptive and transport roots, determined the vertical placement of these two types of fine roots, and examined the abiotic and biotic factors that may regulate the horizontal allocation of fine roots. We found that the contribution of absorptive shrub roots to absorptive roots of the woody plants was higher than the contribution of total shrub fine roots to the total fine roots of the woody plants in the topsoil. Understory plants allocated a greater proportion of their absorptive roots to transport roots (Ratio(A/T)) and more total fine-root biomass than trees in the topsoil. Trees had a lower Ratio(A/T) in the topsoil; but increased their contribution of fine-root biomass to the total fine-root biomass and Ratio(A/T) with depth. The proliferation of shrub fine roots in the topsoil was affected more by soil structure (rock-fragment content and bulk density) than by nearby stems, and the growth of tree fine roots was inhibited by nearby dense and/or large stems. Our results provide evidence of an elaborate differentiation of root deployment between trees and understory plants. The roots of understory plants dominated the topsoil by possessing a higher branching capacity of absorptive roots than trees, filling the readily occupied macropores and being less affected by nearby stems. Trees enhance their resource foraging towards deeper soil by increasing their advantage of occupying soil volume and branching capacity of absorptive roots with depth. We also suggested that the roots of understory plants may affect ecosystemic carbon and nutrients cycling more than expected because of the disproportionately higher investment of absorptive roots in the topsoil.
KeywordAbsorptive roots Branch capacity Horizontal distribution Root order Transport roots Vertical distribution
DOI10.1007/s11104-018-3778-3
WOS KeywordSPRUCE PICEA-ABIES ; LONGLEAF PINE FOREST ; FAGUS-SYLVATICA L. ; NORWAY SPRUCE ; SOIL ACIDITY ; SCOTS PINE ; LIFE-SPAN ; SPECIES-DIVERSITY ; BOREAL FOREST ; MYCORRHIZAL FUNGI
Indexed BySCI
Language英语
Funding ProjectNational Natural Science Foundations of China[31730014] ; National Natural Science Foundations of China[41671224] ; National Key Research and Development Program of China[2016YFD0600202]
Funding OrganizationNational Natural Science Foundations of China ; National Key Research and Development Program of China
WOS Research AreaAgriculture ; Plant Sciences
WOS SubjectAgronomy ; Plant Sciences ; Soil Science
WOS IDWOS:000444759900029
PublisherSPRINGER
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Document Type期刊论文
Identifierhttp://ir.igsnrr.ac.cn/handle/311030/52936
Collection中国科学院地理科学与资源研究所
Corresponding AuthorFu, Xiaoli
Affiliation1.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Key Lab Ecosyst Network Observat & Modeling, Qianyanzhou Ecol Res Stn, 11A Datun Rd, Beijing 100101, Peoples R China
2.Univ Chinese Acad Sci, Coll Resources & Environm, Beijing 100190, Peoples R China
3.Jiangxi Prov Key Lab Ecosyst Proc & Informat, Jian 343725, Jiangxi, Peoples R China
Recommended Citation
GB/T 7714
Jiang, Peipei,Wang, Huimin,Fu, Xiaoli,et al. Elaborate differences between trees and understory plants in the deployment of fine roots[J]. PLANT AND SOIL,2018,431(1-2):433-447.
APA Jiang, Peipei,Wang, Huimin,Fu, Xiaoli,Dai, Xiaoqin,Kou, Liang,&Wang, Junlong.(2018).Elaborate differences between trees and understory plants in the deployment of fine roots.PLANT AND SOIL,431(1-2),433-447.
MLA Jiang, Peipei,et al."Elaborate differences between trees and understory plants in the deployment of fine roots".PLANT AND SOIL 431.1-2(2018):433-447.
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