Ecophysiological responses of two poplar species to intraspecific and interspecific competition under different nitrogen levels

Show simple item record Li, Yan Kang, Jieyu Li, Zhijun Korpelainen, Helena Li, Chunyang 2021-01-02T15:26:01Z 2021-01-02T15:26:01Z 2020-12
dc.identifier.citation Li , Y , Kang , J , Li , Z , Korpelainen , H & Li , C 2020 , ' Ecophysiological responses of two poplar species to intraspecific and interspecific competition under different nitrogen levels ' , Journal of Plant Ecology , vol. 13 , no. 6 , pp. 693-703 .
dc.identifier.other PURE: 157652788
dc.identifier.other PURE UUID: fbe2f110-3781-453d-97ab-03cdb6d36062
dc.identifier.other WOS: 000593099700004
dc.identifier.other ORCID: /0000-0002-7046-6995/work/85518301
dc.description.abstract Aims Populus deltoides and P. euramericana are widely used in China as major forestry species. At present, little is known about their responses to nitrogen (N) deficiency when grown in monocultures or mixed plantations. The aim of this investigation was to analyze the growth, and morphological and physiological responses of P. deltoides and P. euramericana to different N levels under competition conditions. Methods We employed two Populus species (P. deltoides and P. euramericana) to discover how N deficiency affects plant traits under different competition types (P. deltoides x P. deltoides, intraspecific competition; P. euramericana x P. euramericana, intraspecific competition; P. deltoides x P. euramericana, interspecific competition). Potted seedlings were exposed to two N levels (normal N, N deficiency), and nitrogen- and competition-driven differences in growth, morphology and physiology were examined. Important Findings Under normal N conditions, interspecific competition significantly decreased the total root weight, root mass fraction (RMF), root-shoot ratio (R/S) and carbon/nitrogen ratio (C/N), and increased the leaf dry weight, leaf mass fraction and total leaf area of P. euramericana compared with intraspecific competition. The same conditions significantly affected the growth and morphological variables of P. deltoides, except for the dry weight of fine roots, R/S, specific leaf area, RMF, total nitrogen content and C/N compared with intraspecific competition. In addition, chlorophyll a (Chla), total chlorophyll (Tchl), carotenoid contents (Caro) and the carbon isotope composition (delta C-13) of P. deltoides were significantly lower in interspecific competition than in intraspecific competition, but no difference was detected in P. euramericana. The effects of N deficiency on P. deltoides under intraspecific competition were stronger than under interspecific competition. In contrast, the effects of N deficiency on P. euramericana between intraspecific and interspecific competition were not significantly different. These results suggest that under normal N condition, P. deltoides is expected to gain an advantage in monocultures rather than in mixtures with P. euramericana. Under N deficiency, the growth performance of P. euramericana was more stable than that of P. deltoides under both cultivation modes. en
dc.format.extent 11
dc.language.iso eng
dc.relation.ispartof Journal of Plant Ecology
dc.rights other
dc.rights.uri info:eu-repo/semantics/openAccess
dc.subject competition
dc.subject nutrient resorption efficiency
dc.subject photosynthesis capacity
dc.subject competition intensity index
dc.subject N deficiency
dc.subject DIVERSITY
dc.subject GROWTH
dc.subject ALLOCATION
dc.subject 11831 Plant biology
dc.subject 1181 Ecology, evolutionary biology
dc.title Ecophysiological responses of two poplar species to intraspecific and interspecific competition under different nitrogen levels en
dc.type Article
dc.contributor.organization Department of Agricultural Sciences
dc.contributor.organization Viikki Plant Science Centre (ViPS)
dc.contributor.organization Population Genetics and Biodiversity Group
dc.contributor.organization Plant Production Sciences
dc.description.reviewstatus Peer reviewed
dc.relation.issn 1752-9921
dc.rights.accesslevel openAccess
dc.type.version acceptedVersion

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