NDLI: Dynamics of CO$_{2}$ efflux from the substrate root system of container-grown plants associated with irrigation cycles

Content Provider	Springer Nature Link
Author	Casadesus, Jaume Caceres, Rafaela Marfa, Oriol
Copyright Year	2007
Abstract	In intensive horticultural crops, the choice of growing media and the adequate management of irrigation must ensure an optimal trade-off between aeration and water supply to roots. The proportion of gas-filled pores and their composition can be strongly affected by the water status and hence by irrigation. In this context, continuous measurement of gas exchange and water status of the growing medium could bring out some insights into how irrigation events affect root activity and aeration in a time scale of minutes to several hours. For this purpose, a measuring system was developed that measured the CO$_{2}$ efflux rate from the entire substrate root system of pot plants while their shoots were kept outside, undisturbed. It was able to monitor four plants at a time for several weeks at a rate of one measurement per plant every 10 min, thus tracing the dynamics of CO$_{2}$ efflux through a great many irrigation cycles. The results showed a marked pattern of CO$_{2}$ efflux around each irrigation event, consisting mainly of a sharp, conspicuous peak followed by a depression until a threshold in substrate water potential was reached. Analysis of these data suggests that the pattern is imposed mainly by the effects of irrigation and water content on the mobility of gases in the growing medium. The peak can be explained by the CO$_{2}$-enriched air being displaced by the water added to the growing medium in the pot, and the following depression can be the result of the reduced mobility of gases when substrate water content is high. In spite of the great variation in the instantaneous efflux rate of CO$_{2}$, the integration of these CO$_{2}$ values for the entire day provides a rather predictable value given the root biomass and does not seem to be affected by the number of irrigation events that occur in a given day.
Starting Page	71
Ending Page	82
Page Count	12
File Format	PDF
ISSN	0032079X
Journal	Plant and Soil
Volume Number	300
Issue Number	1-2
e-ISSN	15735036
Language	English
Publisher	Springer Netherlands
Publisher Date	2007-09-11
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	CO$_{2}$ efflux Gas diffusivity Irrigation Root respiration Soilless culture Aeration Ecology Plant Physiology Soil Science & Conservation Plant Sciences
Content Type	Text
Resource Type	Article
Subject	Soil Science Plant Science

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