NDLI: Phosphorus supply enhances the response of legumes to elevated CO$_{2}$ (FACE) in a phosphorus-deficient vertisol

Content Provider	Springer Nature Link
Author	Jin, Jian Tang, Caixian Armstrong, Roger Sale, Peter
Copyright Year	2012
Abstract	Understanding the mechanism of how phosphorus (P) regulates the response of legumes to elevated CO$_{2}$ (eCO$_{2}$) is important for developing P management strategies to cope with increasing atmospheric CO$_{2}$ concentration. This study aimed to explore this mechanism by investigating interactive effects of CO$_{2}$ and P supply on root morphology, nodulation and soil P fractions in the rhizosphere.A column experiment was conducted under ambient (350 ppm) (aCO$_{2}$) and eCO$_{2}$ (550 ppm) in a free air CO$_{2}$ enrichment (FACE) system. Chickpea and field pea were grown in a P-deficient Vertisol with P addition of 0–16 mg P kg$^{−1}$.Increasing P supply increased plant growth and total P uptake with the increase being greater under eCO$_{2}$ than under aCO$_{2}$. Elevated CO$_{2}$ increased root biomass and length, on average, by 16 % and 14 %, respectively. Nodule biomass increased by 46 % in response to eCO$_{2}$ at 16 mg P kg$^{−1}$, but was not affected by eCO$_{2}$ at no P supply. Total P uptake was correlated with root length while N uptake correlated with nodule number and biomass regardless of CO$_{2}$ level. Elevated CO$_{2}$ increased the NaOH-extractable organic P by 92 % when 16 mg P kg$^{−1}$ was applied.The increase in P and N uptake and nodule number under eCO$_{2}$ resulted from the increased biomass production, rather than from changes in specific root-absorbing capability or specific nodule function. Elevated CO$_{2}$ appears to enhance P immobilization in the rhizosphere.
Starting Page	91
Ending Page	104
Page Count	14
File Format	PDF
ISSN	0032079X
Journal	Plant and Soil
Volume Number	358
Issue Number	1-2
e-ISSN	15735036
Language	English
Publisher	Springer Netherlands
Publisher Date	2012-05-10
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Free air CO$_{2}$ enrichment FACE N$_{2}$ fixation Nodulation P acquisition P fractions Rhizosphere Plant Physiology Soil Science & Conservation Ecology Plant Sciences
Content Type	Text
Resource Type	Article
Subject	Soil Science Plant Science

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