NDLI: Dynamic linking of $^{14}$C partitioning with shoot growth allows a precise determination of plant-derived C input to soil

Content Provider	Springer Nature Link
Author	Remus, Rainer Augustin, Jürgen
Copyright Year	2016
Abstract	The influence of changing carbon (C) assimilation and relative C partitioning during plant development on the transfer of absolute C amounts (mg C per plant) into the subsurface should be analyzed and estimated. Moreover, an approach to determine the precision of the modeled C transfer values should be developed.Several relative $^{14}$C partitioning coefficients were derived from pulse labeling experiments at different developmental stages using spring rye as a model plant. Subsequently, relative $^{14}$C allocation was dynamically linked with daily shoot C mass increments to obtain precise information about C partitioning at different plant developmental stages and during the entire growing season.The transfer of assimilated C into the subsurface during the plant development is a highly dynamic process, in which the maximum root growth preceded maximum shoot growth by approximately 17 days. The model simulations indicate that 18 ± 2 % of all assimilated C that was not respired by shoots was transferred into the subsurface during the entire growing season. This flow splits into 9 ± 0.8 % C for root growth, 6 ± 0.7 % C for belowground respiration, and 3 ± 0.3 % C for detectable rhizodeposition. Nearly half of the downward-transferred C flowed into the subsurface between elongation growth and the last boot stage. Moreover, highly correlated relationships between root growth, rhizodeposition, and belowground respiration were found.Our study clearly shows that the dynamic linking of relative C partitioning with absolute C assimilation can provide detailed and precise information about the downward-transferred C during different developmental stages and the entire growing season.
Starting Page	493
Ending Page	513
Page Count	21
File Format	PDF
ISSN	0032079X
Journal	Plant and Soil
Volume Number	408
Issue Number	1-2
e-ISSN	15735036
Language	English
Publisher	Springer International Publishing
Publisher Date	2016-09-20
Publisher Place	Cham
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Carbon partitioning $^{14}$C pulse labeling Root growth Rhizodeposition Belowground respiration Plant Sciences Soil Science & Conservation Plant Physiology Ecology
Content Type	Text
Resource Type	Article
Subject	Soil Science Plant Science

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