NDLI: Does hydraulic lift or nighttime transpiration facilitate nitrogen acquisition?

Content Provider	Springer Nature Link
Author	Snyder, Keirith A. James, Jeremy J. Richards, James H. Dovan, Lisa A.
Copyright Year	2008
Abstract	Water movement from roots to soil at night in the process of hydraulic lift (redistribution) rehydrates the rhizosphere and has been proposed to improve plant nutrient acquisition. Another process that has now been found in many plant species is nighttime transpiration and this could also affect nutrient relations by influencing supply of mobile nutrients to roots at night. The effects of these soil/root water relations interactions have not been adequately tested. We chose ten Sarcobatus vermiculatus (Hook.) Torrey shrubs with different magnitudes of hydraulic lift (i.e. diel range in soil water potential) to test the hypothesis that the magnitude of lift would be positively related to the amount of nitrogen (N) uptake over a period of days. A $^{15}$N tracer was injected in the 20–30 cm soil layer at locations with hydraulic lift to determine plant $^{15}$N acquisition by shallow roots conducting hydraulic lift. Half of the plants were also placed in large humidified tents (i.e. “bagged”), which suppressed nighttime transpiration, and thus were expected to have greater magnitudes of hydraulic lift, although they did not. All plants took up the $^{15}$N tracer, but contrary to our hypothesis the magnitude of hydraulic lift had no significant effect on the amount of $^{15}$N acquired over a 9-day period following labeling. However, plants that were bagged tended to have lower $^{15}$N acquisition (P = 0.07). These data indicate that decreased nighttime transpirational water loss or some other effect of bagging may decrease nutrient acquisition by these nutrient-limited phreatophytic shrubs and more generally suggests a possible nutritional benefit of nighttime transpiration by plants. This suggestion needs more thorough testing to elucidate an important potential link between plant water and nutrient relations.
Starting Page	159
Ending Page	166
Page Count	8
File Format	PDF
ISSN	0032079X
Journal	Plant and Soil
Volume Number	306
Issue Number	1-2
e-ISSN	15735036
Language	English
Publisher	Springer Netherlands
Publisher Date	2008-02-21
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Desert shrubs Hydraulic lift Hydraulic redistribution Nighttime transpiration Nitrogen acquisition Nitrogen isotopes Sarcobatus vermiculatus Ecology Plant Physiology Soil Science & Conservation Plant Sciences
Content Type	Text
Resource Type	Article
Subject	Soil Science Plant Science

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