dc.contributor.author |
Zhao, X |
|
dc.contributor.author |
Cranston, B |
|
dc.contributor.author |
Macinnis-Ng, C |
|
dc.date.accessioned |
2021-02-17T03:22:23Z |
|
dc.date.available |
2021-02-17T03:22:23Z |
|
dc.date.issued |
2020-12-1 |
|
dc.identifier.issn |
0567-7572 |
|
dc.identifier.uri |
https://hdl.handle.net/2292/54491 |
|
dc.description.abstract |
© 2020 International Society for Horticultural Science. All rights reserved. The southern conifer Agathis australis is among the largest (by volume) and longest-lived trees in the world. They are confined to the north of New Zealand’s north island where droughts will become more frequent and severe under future climatic conditions. To explore the impact of drought on water relations of A. australis we installed a throughfall exclusion experiment at the Huapai Scientific Reserve, West Auckland. We measured sap flow density (Fd) in both control and drought trees during spring and summer seasons at the base of the stem. We used relative sap flow density (Fd-R) to offset the original sap flow difference between individuals. We then calculated time lags and whole tree hydraulic conductance in both control and drought trees. Fd-R was higher during January 2019, which had the highest stomatal conductance and the shortest time lag (0.5-1.5 h) between canopy and base. The smallest daily Fd-R was observed in drought trees during March 2019, which had the lowest water potential and had the driest soil (17% at 20 cm and 33% at 60 cm). We observed lower Fd-R values and lower whole-tree hydraulic conductance (Kh) in drought trees compared to control trees suggesting that drought significantly affected the water relations even though pre-dawn leaf water potential (Ψpd) and stomatal conductance (gs) were not consistently lower in drought trees across seasons. |
|
dc.publisher |
International Society for Horticultural Science (ISHS) |
|
dc.relation.ispartofseries |
Acta Horticulturae |
|
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. |
|
dc.rights.uri |
https://researchspace.auckland.ac.nz/docs/uoa-docs/rights.htm |
|
dc.subject |
0607 Plant Biology |
|
dc.subject |
0706 Horticultural Production |
|
dc.title |
Water relations of the southern conifer Agathis australis in a throughfall exclusion experiment |
|
dc.type |
Journal Article |
|
dc.identifier.doi |
10.17660/actahortic.2020.1300.10 |
|
pubs.issue |
1300 |
|
pubs.begin-page |
73 |
|
pubs.volume |
1300 |
|
dc.date.updated |
2021-01-04T09:05:48Z |
|
dc.rights.holder |
Copyright: The author |
en |
pubs.end-page |
80 |
|
pubs.publication-status |
Published |
|
dc.rights.accessrights |
http://purl.org/eprint/accessRights/RestrictedAccess |
en |
pubs.subtype |
Journal Article |
|
pubs.elements-id |
833328 |
|
dc.identifier.eissn |
2406-6168 |
|