Water availability moderates N2 fixation benefit from elevated [CO2]: A 2‐year free‐air CO2 enrichment study on lentil (Lens culinaris MEDIK.) in a water limited agroecosystem
Increased biomass and yield of plants grown under elevated [CO2 ] (e [CO2 ]) often corresponds to decreased grain N concentration ([N]), diminishing nutritional quality of crops. Legumes through their symbiotic N2 -fixation may be better able to maintain biomass [N] and grain [N] under e [CO2 ], provided N2 -fixation is stimulated by e [CO2 ] in line with growth and yield. In Mediterranean type agro-ecosystems, N2 -fixation may be impaired by drought and it is unclear whether e [CO2 ] stimulation of N2 -fixation can overcome this impact in dry years. To address this question, we grew lentil under two [CO2 ] (ambient ~400 ppm and elevated ~550 ppm) levels in a Free-Air CO2 Enrichment (FACE) facility over two growing seasons sharply contrasting in rainfall. Elevated [CO2 ] stimulated N2 -fixation through greater nodule number (+27%), mass (+18%) and specific fixation activity (+17%) and this stimulation was greater in the high than the low rainfall/dry season. Elevated [CO2 ] depressed grain [N] (-4%) in the dry season. In contrast, grain [N] increased (+3%) in the high rainfall season under e [CO2 ], as a consequence of greater post-flowering N2 fixation. Our results suggest that the benefit for N2 -fixation from e [CO2 ] is high as long as there is enough soil water to continue N2 -fixation during grain filling.
This research output has an Altmetric Attention Score of 1. This is our high-level measure of the quality and quantity of online attention that it has received. This Attention Score, as well as the ranking and number of research outputs shown below, was calculated when the research output was last mentioned on 24 September 2019.
All research outputs
#18,893,608
of 27,396,316 outputs
Outputs from Plant, Cell & Environment
#2,363
of 3,330 outputs
Outputs of similar age
#226,260
of 344,070 outputs
Outputs of similar age from Plant, Cell & Environment
#55
of 73 outputs
Altmetric has tracked 27,396,316 research outputs across all sources so far. This one is in the 21st percentile – i.e., 21% of other outputs scored the same or lower than it.
So far Altmetric has tracked 3,330 research outputs from this source. They typically receive a little more attention than average, with a mean Attention Score of 6.0. This one is in the 20th percentile – i.e., 20% of its peers scored the same or lower than it.
Older research outputs will score higher simply because they've had more time to accumulate mentions. To account for age we can compare this Altmetric Attention Score to the 344,070 tracked outputs that were published within six weeks on either side of this one in any source. This one is in the 25th percentile – i.e., 25% of its contemporaries scored the same or lower than it.
We're also able to compare this research output to 73 others from the same source and published within six weeks on either side of this one. This one is in the 21st percentile – i.e., 21% of its contemporaries scored the same or lower than it.
