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Root size and soil environments determine root lifespan: evidence from an alpine meadow on the Tibetan Plateau
Wu, Yibo1,2; Deng, Yongcui2; Zhang, Jing2; Wu, Jing2; Tang, Yanhong3; Cao, Guangmin4; Zhang, Fawei4; Cui, Xiaoyong2; Cui, XY (reprint author), Univ Chinese Acad Sci, Coll Life Sci, Beijing 100049, Peoples R China.
2013-05-01
Source PublicationECOLOGICAL RESEARCH
ISSN0912-3814
Volume28Issue:3Pages:493-501
SubtypeArticle
AbstractWe used a minirhizotron system to investigate the influence of three major factors-root morphology, root depth, and season of root emergence-on root survivorship and longevity in a Kobresia humilis meadow on the Tibetan Plateau during the growing season of 2009. Root longevity was assessed by survival analysis, Kaplan-Meier analysis, and Cox proportional hazards regression. Root longevity was correlated positively with root diameter. A 17.5 % decrease in the risk of mortality was associated with a 0.1-mm increase in diameter. Roots distributed in the top 10 cm of the soil had significantly shorter longevities than roots at greater depths, with a 48 % decrease of mortality risk for each 10-cm increase in soil depth from the surface to 40 cm. Of all the factors examined, the season of root emergence had the strongest effect on root lifespan. Roots that emerged in May and June had shorter longevity than roots that emerged later in the year, and roots that emerged in September and October were more likely to survive over winter. Our findings indicated that life-history traits of roots in K. humilis meadows are highly heterogeneous, and this heterogeneity should be considered when modeling the contribution of roots to carbon and nitrogen fluxes in this type of meadow ecosystem. Moreover, temporal, spatial, and compositional variations in root longevity must be considered.; We used a minirhizotron system to investigate the influence of three major factors-root morphology, root depth, and season of root emergence-on root survivorship and longevity in a Kobresia humilis meadow on the Tibetan Plateau during the growing season of 2009. Root longevity was assessed by survival analysis, Kaplan-Meier analysis, and Cox proportional hazards regression. Root longevity was correlated positively with root diameter. A 17.5 % decrease in the risk of mortality was associated with a 0.1-mm increase in diameter. Roots distributed in the top 10 cm of the soil had significantly shorter longevities than roots at greater depths, with a 48 % decrease of mortality risk for each 10-cm increase in soil depth from the surface to 40 cm. Of all the factors examined, the season of root emergence had the strongest effect on root lifespan. Roots that emerged in May and June had shorter longevity than roots that emerged later in the year, and roots that emerged in September and October were more likely to survive over winter. Our findings indicated that life-history traits of roots in K. humilis meadows are highly heterogeneous, and this heterogeneity should be considered when modeling the contribution of roots to carbon and nitrogen fluxes in this type of meadow ecosystem. Moreover, temporal, spatial, and compositional variations in root longevity must be considered.
KeywordMinirhizotron Alpine Meadow Root Lifespan Survival Analysis Seasonal Dynamics
WOS HeadingsScience & Technology ; Life Sciences & Biomedicine
WOS KeywordNORTHERN HARDWOOD FORESTS ; LONGLEAF PINE FOREST ; FINE ROOTS ; NITROGEN AVAILABILITY ; NUTRIENT CONTENTS ; ELEVATED CO2 ; TURNOVER ; DYNAMICS ; ECOSYSTEMS ; TREES
Indexed BySCI
Language英语
WOS Research AreaEnvironmental Sciences & Ecology
WOS SubjectEcology
WOS IDWOS:000318569100013
Citation statistics
Cited Times:12[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://210.75.249.4/handle/363003/3947
Collection中国科学院西北高原生物研究所
Corresponding AuthorCui, XY (reprint author), Univ Chinese Acad Sci, Coll Life Sci, Beijing 100049, Peoples R China.
Affiliation1.Ningbo Univ, Coll Architectural Civil Engn & Environm, Ningbo 315211, Zhejiang, Peoples R China
2.Univ Chinese Acad Sci, Coll Life Sci, Beijing 100049, Peoples R China
3.Natl Inst Environm Studies, Tsukuba, Ibaraki 3058569, Japan
4.Chinese Acad Sci, Northwest Plateau Inst Biol, Xining 810001, Peoples R China
Recommended Citation
GB/T 7714
Wu, Yibo,Deng, Yongcui,Zhang, Jing,et al. Root size and soil environments determine root lifespan: evidence from an alpine meadow on the Tibetan Plateau[J]. ECOLOGICAL RESEARCH,2013,28(3):493-501.
APA Wu, Yibo.,Deng, Yongcui.,Zhang, Jing.,Wu, Jing.,Tang, Yanhong.,...&Cui, XY .(2013).Root size and soil environments determine root lifespan: evidence from an alpine meadow on the Tibetan Plateau.ECOLOGICAL RESEARCH,28(3),493-501.
MLA Wu, Yibo,et al."Root size and soil environments determine root lifespan: evidence from an alpine meadow on the Tibetan Plateau".ECOLOGICAL RESEARCH 28.3(2013):493-501.
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