Root biomass dynamics in a semi-natural grassland exposed to elevated atmospheric CO<sub>2</sub>for five years

Sindhöj, Erik; Andrén, Olof; Kätterer, Thomas; Marissink, Mark; Pettersson, Roger

doi:10.1080/09064710310022032

Cited by 7 publications

(10 citation statements)

References 26 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Increased root growth and biomass under elevated CO 2 was observed, similar to other grassland studies (Jackson and Reynolds 1996;Sindhøj et al 2004). In Calluna, a clear CO 2 response was only seen in the in-growth cores, and a response in undisturbed areas might become pronounced only after a disturbance or after a longer time period.…”

Section: Net Root Growth and Standing Root Biomasssupporting

confidence: 87%

Root growth and N dynamics in response to multi-year experimental warming, summer drought and elevated CO2 in a mixed heathland-grass ecosystem

Arndal

Schmidt

Beier

et al. 2014

Functional Plant Biol.

View full text Add to dashboard Cite

Abstract. Ecosystems exposed to elevated CO 2 are often found to sequester more atmospheric carbon due to increased plant growth. We exposed a Danish heath ecosystem to elevated CO 2 , elevated temperature and extended summer drought alone and in all combinations in order to study whether the expected increased growth would be matched by an increase in root nutrient uptake of NH 4 + -N and NO 3 --N. Root growth was significantly increased by elevated CO 2 . The roots, however, did not fully compensate for the higher growth with a similar increase in nitrogen uptake per unit of root mass. Hence the nitrogen concentration in roots was decreased in elevated CO 2 , whereas the biomass N pool was unchanged or even increased. The higher net root production in elevated CO 2 might be a strategy for the plants to cope with increased nutrient demand leading to a long-term increase in N uptake on a whole-plant basis. Drought reduced grass root biomass and N uptake, especially when combined with warming, but CO 2 was the most pronounced main factor effect. Several significant interactions of the treatments were found, which indicates that the responses were nonadditive and that changes to multiple environmental changes cannot be predicted from single-factor responses alone.

show abstract

Section: Net Root Growth and Standing Root Biomasssupporting

confidence: 87%

Root growth and N dynamics in response to multi-year experimental warming, summer drought and elevated CO2 in a mixed heathland-grass ecosystem

Arndal

Schmidt

Beier

et al. 2014

Functional Plant Biol.

View full text Add to dashboard Cite

show abstract

“…Many open‐top chamber studies in grasslands also show greater fine roots under elevated CO 2 (Pendall et al. , 2004; Sindhøj et al. , 2004; Milchunas et al.…”

Section: Discussionmentioning

confidence: 96%

“…Similar to shortgrass steppe ecosystems (Milchunas et al, 2005), fine root loss was not as strongly influenced by time of year or precipitation as production, and survival and proportional hazard analyses indicate that roots typically are slowly lost through time. By contrast, mesic forest (Norby et al, 2004) and grassland (Sindhøj et al, 2004) ecosystems have seasonal losses of fine roots that start near the end of the growing season.…”

Section: Fine Root Dynamicsmentioning

confidence: 98%

“…Increases in fine roots often were observed in forest FACE experiments (Norby et al, 2004;Iversen et al, 2008;Pregitzer et al, 2008;Pritchard et al, 2008;Jackson et al, 2009;Liberloo et al, 2009) and in a grazed pasture FACE experiment (Allard et al, 2005). Many open-top chamber studies in grasslands also show greater fine roots under elevated CO 2 (Pendall et al, 2004;Sindhøj et al, 2004;Milchunas et al, 2005;LeCain et al, 2006;Volder et al, 2007;Anderson et al, 2010). However, increased fine roots under elevated CO 2 were not uniform or did not occur in some FACE studies.…”

Section: New Phytologistmentioning

confidence: 99%

See 1 more Smart Citation

Transitory effects of elevated atmospheric CO₂ on fine root dynamics in an arid ecosystem do not increase long‐term soil carbon input from fine root litter

Ferguson

Nowak

2011

New Phytologist

View full text Add to dashboard Cite

Summary• Experimental increases in atmospheric CO 2 often increase root production over time, potentially increasing soil carbon (C) sequestration.• Effects of elevated atmospheric CO 2 on fine root dynamics in a Mojave desert ecosystem were examined for the last 4.5 yr of a long-term (10-yr) free air CO 2 enrichment (FACE) study at the Nevada desert FACE facility (NDFF). Sets of minirhizotron tubes were installed at the beginning of the NDFF experiment to characterize rooting dynamics of the dominant shrub Larrea tridentata, the codominant shrub Ambrosia dumosa and the plant community as a whole.• Although significant treatment effects occurred sporadically for some fine root measurements, differences were transitory and often in opposite directions during other time-periods. Nonetheless, earlier root growth under elevated CO 2 helped sustain increased assimilation and shoot growth.• Overall CO 2 treatment effects on fine root standing crop, production, loss, turnover, persistence and depth distribution were not significant for all sampling locations. These results were similar to those that occurred near the beginning of the NDFF experiment but unlike those in other ecosystems. Thus, increased C input into soils is unlikely to occur from fine root litter under elevated atmospheric CO 2 in this arid ecosystem.

show abstract

“…Salsman et al (1999) reported root growth increased nearly by 60% in Phaseolus acutifolius under 700 ppm over 550 ppm, which is considered as ambient. In semi-natural grassland the root production increased up to 25% in the first year and around 80% in the next two years at 700 ppm CO 2 over ambient level (Sindhoj et al 2004). The shoot length of castor bean increased with enhanced levels of CO 2 more at the higher concentration.…”

Section: Yield and Yield Componentsmentioning

confidence: 93%

Growth and yield responses of castor bean (Ricinus communis L.) at two enhanced CO<sub>2</sub> levels

Vanaja¹,

Jyothi²,

Ratnakumar³

et al. 2008

PLANT SOIL ENVIRON

View full text Add to dashboard Cite

Growth and yield responses of castor bean (Ricinus communis L.) to two elevated CO 2 levels (550 and 700 ppm) were evaluated up to the maturity of first order spikes in open top chambers (OTCs). The growth characteristics -root and shoot lengths, root volume, root:shoot ratios, leaf area, dry weights of different plant parts, leaf area duration and crop growth rate increased with 550 and 700 ppm of CO 2 levels compared with ambient control. The spike length, pod and seed yield of first order spikes increased under enhanced CO 2 levels over ambient control. Elevated CO 2 levels significantly increased the total biomass and yield of castor bean, however enhanced CO 2 levels per se did not changed the content and quality of the castor oil. A positive response of castor bean to increased CO 2 concentrations is a good indication for its future existence in potentially changed climatic conditions.

show abstract

Root biomass dynamics in a semi-natural grassland exposed to elevated atmospheric CO₂for five years

Cited by 7 publications

References 26 publications

Root growth and N dynamics in response to multi-year experimental warming, summer drought and elevated CO2 in a mixed heathland-grass ecosystem

Root growth and N dynamics in response to multi-year experimental warming, summer drought and elevated CO2 in a mixed heathland-grass ecosystem

Transitory effects of elevated atmospheric CO₂ on fine root dynamics in an arid ecosystem do not increase long‐term soil carbon input from fine root litter

Growth and yield responses of castor bean (Ricinus communis L.) at two enhanced CO<sub>2</sub> levels

Contact Info

Product

Resources

About

Root biomass dynamics in a semi-natural grassland exposed to elevated atmospheric CO2for five years

Cited by 7 publications

References 26 publications

Root growth and N dynamics in response to multi-year experimental warming, summer drought and elevated CO2 in a mixed heathland-grass ecosystem

Root growth and N dynamics in response to multi-year experimental warming, summer drought and elevated CO2 in a mixed heathland-grass ecosystem

Transitory effects of elevated atmospheric CO2 on fine root dynamics in an arid ecosystem do not increase long‐term soil carbon input from fine root litter

Growth and yield responses of castor bean (Ricinus communis L.) at two enhanced CO<sub>2</sub> levels

Contact Info

Product

Resources

About

Root biomass dynamics in a semi-natural grassland exposed to elevated atmospheric CO₂for five years

Transitory effects of elevated atmospheric CO₂ on fine root dynamics in an arid ecosystem do not increase long‐term soil carbon input from fine root litter