%0 Journal Article %1 citeulike:12890269 %A Lieffering, Mark %A Kim, Han-Yong %A Kobayashi, Kazuhiko %A Okada, Masumi %D 2004 %J Field Crops Research %K citeulikeExport co2, face, grain, nutrient, rice, riceface, s2, shizukuishi %N 2-3 %P 279--286 %R 10.1016/j.fcr.2004.01.004 %T The impact of elevated CO2 on the elemental concentrations of field-grown rice grains %U http://dx.doi.org/10.1016/j.fcr.2004.01.004 %V 88 %X Although the projected increases in global atmospheric CO2 levels are expected to lead to greater yields, little is known about the effects of elevated CO2 on the grain nutrient concentrations of staple food crops such as rice (Oryza sativa L.). Large changes could have potential implications for the micro-elemental nutrition of populations where these grains provide a large proportion of the dietary needs. The limited data on the effects of elevated CO2 on grain elemental concentrations is derived from plants growing in pots placed in environmental enclosures: these indicate that elevated CO2 can cause large decreases in grain elemental concentrations. In view of the lack of data from field-grown plants, we analysed the elemental concentrations of archived grain samples collected from temperate rice crops grown under free-air CO2 enrichment (FACE) conditions. Like in the pot experiments, in our study elevated CO2 increased biomass and grain production and decreased grain N concentrations. In contrast however, we found no changes in the concentrations of any of the other elements analysed. We thought it is likely that dilution was observed in the pot studies because nutrient supplies were limiting, primarily because of the small rooting volumes. In contrast, our experiment was conducted under field conditions, with highly fertile soils and large rooting volumes leading to plentiful nutrient supplies (especially micro-elements). The root production response under elevated CO2 was more than twice the aboveground biomass response; we hypothesised that if this led to a greater relative nutrient uptake capacity, elemental uptake may have matched the increase in aboveground biomass and hence no change in concentration would be detected. We conclude that a dilution of elements in the grain is not a foregone conclusion under elevated CO2: where elements are in plentiful supply and uptake rates can match increases in yield, no dilution will be detected. However, because elemental levels in most agro-ecosystems are usually less than in our experiment, some dilution is likely to occur, but to a lesser extent than that found in pot experiments where nutrient dilution is likely to be common phenomena.

@article{citeulike:12890269, abstract = {{Although the projected increases in global atmospheric CO2 levels are expected to lead to greater yields, little is known about the effects of elevated CO2 on the grain nutrient concentrations of staple food crops such as rice (Oryza sativa L.). Large changes could have potential implications for the micro-elemental nutrition of populations where these grains provide a large proportion of the dietary needs. The limited data on the effects of elevated CO2 on grain elemental concentrations is derived from plants growing in pots placed in environmental enclosures: these indicate that elevated CO2 can cause large decreases in grain elemental concentrations. In view of the lack of data from field-grown plants, we analysed the elemental concentrations of archived grain samples collected from temperate rice crops grown under free-air CO2 enrichment (FACE) conditions. Like in the pot experiments, in our study elevated CO2 increased biomass and grain production and decreased grain N concentrations. In contrast however, we found no changes in the concentrations of any of the other elements analysed. We thought it is likely that dilution was observed in the pot studies because nutrient supplies were limiting, primarily because of the small rooting volumes. In contrast, our experiment was conducted under field conditions, with highly fertile soils and large rooting volumes leading to plentiful nutrient supplies (especially micro-elements). The root production response under elevated CO2 was more than twice the aboveground biomass response; we hypothesised that if this led to a greater relative nutrient uptake capacity, elemental uptake may have matched the increase in aboveground biomass and hence no change in concentration would be detected. We conclude that a dilution of elements in the grain is not a foregone conclusion under elevated CO2: where elements are in plentiful supply and uptake rates can match increases in yield, no dilution will be detected. However, because elemental levels in most agro-ecosystems are usually less than in our experiment, some dilution is likely to occur, but to a lesser extent than that found in pot experiments where nutrient dilution is likely to be common phenomena.}}, added-at = {2019-03-31T01:14:40.000+0100}, author = {Lieffering, Mark and Kim, Han-Yong and Kobayashi, Kazuhiko and Okada, Masumi}, biburl = {https://www.bibsonomy.org/bibtex/214356e31956b620de61b7f1983cab07a/dianella}, citeulike-article-id = {12890269}, citeulike-linkout-0 = {http://dx.doi.org/10.1016/j.fcr.2004.01.004}, doi = {10.1016/j.fcr.2004.01.004}, interhash = {081c1cdd2c9329cc5016837e13756925}, intrahash = {14356e31956b620de61b7f1983cab07a}, issn = {03784290}, journal = {Field Crops Research}, keywords = {citeulikeExport co2, face, grain, nutrient, rice, riceface, s2, shizukuishi}, month = aug, number = {2-3}, pages = {279--286}, posted-at = {2014-01-03 19:11:02}, priority = {5}, timestamp = {2019-03-31T01:16:26.000+0100}, title = {{The impact of elevated CO2 on the elemental concentrations of field-grown rice grains}}, url = {http://dx.doi.org/10.1016/j.fcr.2004.01.004}, volume = 88, year = 2004 }