* • Here we analysed the effects of CO2 (Ca) elevation and nitrogen availability on canopy structure, leaf area index (LAI) and canopy photosynthesis of rice (Oryza sativa). * • Rice was grown at ambient and elevated Ca (c. 200 µmol mol−1 above ambient, using the free-air CO2 enrichment, FACE) and at two N availabilities. We measured leaf area, area-based leaf N contents and leaf photosynthesis, and calculated net daily canopy photosynthesis. * • FACE plants had higher light-saturated rates of photosynthesis (Pmax) and apparent quantum yields than ambient plants, when measured at their own growth CO2. Ca elevation reduced the total leaf N in the canopy (Nleaf) but had no effect on LAI, and the average leaf N content (Nleaf/LAI) was therefore reduced by 8\%. This reduction corresponded well with our model predictions. Leaf area index increased strongly with N availability, which was also consistent with our model. * • Calculated canopy photosynthesis increased more strongly with Nleaf under elevated than under ambient Ca. This indicates that there is an N × Ca interactive effect on canopy carbon gain. This interaction was caused by the increase in LAI with N availability, which enhanced the positive effect of the higher quantum yield under Ca elevation.
%0 Journal Article
%1 citeulike:12890272
%A Anten, N. P. R.
%A Hirose, T.
%A Onoda, Y.
%A Kinugasa, T.
%A Kim, H. Y.
%A Okada, M.
%A Kobayashi, K.
%D 2004
%I Blackwell Publishing Ltd
%J New Phytologist
%K citeulikeExport face, lai, nitrogen, photosynthesis, rice, riceface, shizukuishi
%N 2
%P 459--471
%R 10.1046/j.1469-8137.2003.00943.x
%T Elevated CO2 and nitrogen availability have interactive effects on canopy carbon gain in rice
%U http://dx.doi.org/10.1046/j.1469-8137.2003.00943.x
%V 161
%X * • Here we analysed the effects of CO2 (Ca) elevation and nitrogen availability on canopy structure, leaf area index (LAI) and canopy photosynthesis of rice (Oryza sativa). * • Rice was grown at ambient and elevated Ca (c. 200 µmol mol−1 above ambient, using the free-air CO2 enrichment, FACE) and at two N availabilities. We measured leaf area, area-based leaf N contents and leaf photosynthesis, and calculated net daily canopy photosynthesis. * • FACE plants had higher light-saturated rates of photosynthesis (Pmax) and apparent quantum yields than ambient plants, when measured at their own growth CO2. Ca elevation reduced the total leaf N in the canopy (Nleaf) but had no effect on LAI, and the average leaf N content (Nleaf/LAI) was therefore reduced by 8\%. This reduction corresponded well with our model predictions. Leaf area index increased strongly with N availability, which was also consistent with our model. * • Calculated canopy photosynthesis increased more strongly with Nleaf under elevated than under ambient Ca. This indicates that there is an N × Ca interactive effect on canopy carbon gain. This interaction was caused by the increase in LAI with N availability, which enhanced the positive effect of the higher quantum yield under Ca elevation.
@article{citeulike:12890272,
abstract = {{* • Here we analysed the effects of CO2 (Ca) elevation and nitrogen availability on canopy structure, leaf area index (LAI) and canopy photosynthesis of rice (Oryza sativa). * • Rice was grown at ambient and elevated Ca (c. 200 µmol mol−1 above ambient, using the free-air CO2 enrichment, FACE) and at two N availabilities. We measured leaf area, area-based leaf N contents and leaf photosynthesis, and calculated net daily canopy photosynthesis. * • FACE plants had higher light-saturated rates of photosynthesis (Pmax) and apparent quantum yields than ambient plants, when measured at their own growth CO2. Ca elevation reduced the total leaf N in the canopy (Nleaf) but had no effect on LAI, and the average leaf N content (Nleaf/LAI) was therefore reduced by 8\%. This reduction corresponded well with our model predictions. Leaf area index increased strongly with N availability, which was also consistent with our model. * • Calculated canopy photosynthesis increased more strongly with Nleaf under elevated than under ambient Ca. This indicates that there is an N × Ca interactive effect on canopy carbon gain. This interaction was caused by the increase in LAI with N availability, which enhanced the positive effect of the higher quantum yield under Ca elevation.}},
added-at = {2019-03-31T01:14:40.000+0100},
author = {Anten, N. P. R. and Hirose, T. and Onoda, Y. and Kinugasa, T. and Kim, H. Y. and Okada, M. and Kobayashi, K.},
biburl = {https://www.bibsonomy.org/bibtex/2a9431aa19971b500dfe0fe943473f58b/dianella},
citeulike-article-id = {12890272},
citeulike-linkout-0 = {http://dx.doi.org/10.1046/j.1469-8137.2003.00943.x},
day = 1,
doi = {10.1046/j.1469-8137.2003.00943.x},
interhash = {3b80e06312e6d2f76e49960344e77410},
intrahash = {a9431aa19971b500dfe0fe943473f58b},
journal = {New Phytologist},
keywords = {citeulikeExport face, lai, nitrogen, photosynthesis, rice, riceface, shizukuishi},
month = feb,
number = 2,
pages = {459--471},
posted-at = {2014-01-03 19:21:05},
priority = {3},
publisher = {Blackwell Publishing Ltd},
timestamp = {2019-03-31T01:16:26.000+0100},
title = {{Elevated CO2 and nitrogen availability have interactive effects on canopy carbon gain in rice}},
url = {http://dx.doi.org/10.1046/j.1469-8137.2003.00943.x},
volume = 161,
year = 2004
}