Responses of sap flux and intrinsic water use efficiency to canopy and understory nitrogen addition in a temperate broadleaved deciduous forest.

Show simple item record Hu, Yanting en Zhao, Ping en Zhu, Liwei en Zhao, Xiuhua en Ni, Guangyan en Ouyang, Lei en Schäfer, Karina VR en Shen, Weijun en 2020-07-06T00:29:35Z en 2019-01 en
dc.identifier.issn 1879-1026 en
dc.identifier.uri en
dc.description.abstract Increasing atmospheric nitrogen (N) deposition could profoundly impact structure and functioning of forest ecosystems. Therefore, we conducted a two-year (2014-2015) experiment to assess the responses of tree sap flux density (Js) and intrinsic water use efficiency (WUEi) of dominant tree species (Liquidambar formosana, Quercus acutissima and Quercus variabilis) to increased N deposition at a manipulative experiment with canopy and understory N addition in a deciduous broadleaved forest. Five treatments were administered including N addition of 25 kg ha-1 year-1 and 50 kg ha-1 year-1 onto canopy (C25 and C50) and understory (U25 and U50), and control treatment (CK, without N addition). Our results showed neither canopy nor understory N addition had an impact on leaf N content and C:N ratio (P > 0.05). Due to the distinct influencing ways, canopy and understory N addition generated different impacts on Js and WUEi of the dominant tree species. Canopy N addition increased WUEi of Q. variabilis, whereas understory addition treatment had a minimal impact on WUEi. Both N additions did not exert impacts on WUEi of L. formosana and Q. acutissima. Canopy N addition exerted negative impacts on Js and its sensitivity to micrometeorological factors of Q. acutissima and Q. variabilis in 2014, while understory addition showed no effect. Neither canopy nor understory N addition had an influence on Js of L. formosana in 2014. Probably owing to the increased soil acidification as the experiment proceeded, Js of L. formosana and Q. variabilis was decreased by understory N addition while canopy addition had a minimal effect in 2015. Thus, the traditional understory addition approach could not fully reflect the effects of increased N deposition on the canopy-associated transpiration process indicated by the different responses of Js and WUEi to canopy and understory N addition, and exaggerated its influences induced by the variation of soil chemical properties. en
dc.format.medium Print-Electronic en
dc.language eng en
dc.relation.ispartofseries The Science of the total environment en
dc.rights Items in ResearchSpace are protected by copyright, with all rights reserved, unless otherwise indicated. Previously published items are made available in accordance with the copyright policy of the publisher. en
dc.rights.uri en
dc.title Responses of sap flux and intrinsic water use efficiency to canopy and understory nitrogen addition in a temperate broadleaved deciduous forest. en
dc.type Journal Article en
dc.identifier.doi 10.1016/j.scitotenv.2018.08.158 en
pubs.begin-page 325 en
pubs.volume 648 en
dc.rights.holder Copyright: The author en
pubs.end-page 336 en
pubs.publication-status Published en
dc.rights.accessrights en
pubs.subtype Journal Article en
pubs.elements-id 755725 en Science en Biological Sciences en
dc.identifier.eissn 1879-1026 en
pubs.record-created-at-source-date 2018-08-19 en
pubs.dimensions-id 30121032 en

Files in this item

There are no files associated with this item.

Find Full text

This item appears in the following Collection(s)

Show simple item record


Search ResearchSpace