NDLI: Assimilation dynamics of soil carbon and nitrogen by wheat roots and Collembola

Content Provider	Springer Nature Link
Author	Larsen, Thomas Gorissen, Antonie Krogh, Paul Henning Ventura, Marc Magid, Jakob
Copyright Year	2007
Abstract	It has been demonstrated that plant roots can take up small amounts of low-molecular weight (LMW) compounds from the surrounding soil. Root uptake of LMW compounds have been investigated by applying isotopically labelled sugars or amino acids but not labelled organic matter. We tested whether wheat roots took up LMW compounds released from dual-labelled ($^{13}$C and $^{15}$N) green manure by analysing for excess $^{13}$C in roots. To estimate the fraction of green manure C that potentially was available for root uptake, excess $^{13}$C and $^{15}$N in the primary decomposers was estimated by analysing soil dwelling Collembola that primarily feed on fungi or microfauna. The experimental setup consisted of soil microcosm with wheat and dual-labelled green manure additions. Plant growth, plant N and recoveries of $^{13}$C and $^{15}$N in soil, roots, shoots and Collembola were measured at 27, 56 and 84 days. We found a small (<1%) but significant uptake of green manure derived $^{13}$C in roots at the first but not the two last samplings. About 50% of green manure C was not recovered from the soil-plant system at 27 days and additional 8% was not recovered at 84 days. Up to 23% of C in collembolans derived from the green manure at 56 days (the 27 days sampling was lost). Using a linear mixing model we estimated that roots or root effluxes provided the main C source for collembolans (54−79%). We conclude that there is no solid support for claiming that roots assimilated green manure derived C due to very small or no recoveries of excess $^{13}$C in wheat roots. During the incubation the pool of green manure derived C available for root uptake decreased due to decomposition. However, the isotopic composition in Collembola indicated that there was a considerable fraction of green manure derived C in the decomposer system at 56 days thus supporting the premise that LMW compounds containing C from the green manure was released throughout the incubation.
Starting Page	253
Ending Page	264
Page Count	12
File Format	PDF
ISSN	0032079X
Journal	Plant and Soil
Volume Number	295
Issue Number	1-2
e-ISSN	15735036
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	2007-05-26
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Dissolved organic carbon Green manure $^{15}$N $^{13}$C Linear mixing model Folsomia fimetaria Proisotoma minuta Protaphorura armata Ecology Plant Physiology Soil Science & Conservation Plant Sciences
Content Type	Text
Resource Type	Article
Subject	Soil Science Plant Science

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