NDLI: The allocation of assimilated carbon to shoot growth: in situ assessment in natural grasslands reveals nitrogen effects and interspecific differences

Content Provider	Springer Nature Link
Author	Gong, Xiao Ying Berone, Germán Darío Agnusdei, Mónica Graciela Rodríguez Palma, Ricardo Manuel Schäufele, Rudi Lattanzi, Fernando Alfredo
Copyright Year	2013
Abstract	In grasslands, sustained nitrogen loading would increase the proportion of assimilated carbon allocated to shoot growth (A shoot), because it would decrease allocation to roots and also encourage the contribution of species with inherently high A shoot. However, in situ measurements of carbon allocation are scarce. Therefore, it is unclear to what extent species that coexist in grasslands actually differ in their allocation strategy or in their response to nitrogen. We used a mobile facility to perform steady-state 13C-labeling of field stands to quantify, in winter and autumn, the daily relative photosynthesis rate (RPR~tracer assimilated over one light-period) and A shoot (~tracer remaining in shoots after a 100 degree days chase period) in four individual species with contrasting morpho-physiological characteristics coexisting in a temperate grassland of Argentina, either fertilized or not with nitrogen, and either cut intermittently or grazed continuously. Plasticity in response to nitrogen was substantial in most species, as indicated by positive correlations between A shoot and shoot nitrogen concentration. There was a notable interspecific difference: productive species with higher RPR, enhanced by fertilization and characterized by faster leaf turnover rate, allocated ~20 % less of the assimilated carbon to shoot growth than species of lower productivity (and quality) characterized by longer leaf life spans and phyllochrons. These results imply that, opposite to the expected response, sustained nitrogen loading would change little the A shoot of grassland communities if increases at the species-level are offset by decreases associated with replacement of ‘low RPR-high A shoot’ species by ‘high RPR-low A shoot’ species.
Starting Page	1085
Ending Page	1095
Page Count	11
File Format	PDF
ISSN	00298549
Journal	Oecologia
Volume Number	174
Issue Number	4
e-ISSN	14321939
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2013-11-26
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Carbon partitioning Carbon storage Structural tissue Nitrogen loading Carbon use efficiency Ecology Plant Sciences Hydrology/Water Resources
Content Type	Text
Resource Type	Article
Subject	Ecology, Evolution, Behavior and Systematics

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