NDLI: Is tamarisk allelopathic?

Content Provider	Springer Nature Link
Author	Lesica, Peter DeLuca, Thomas H.
Copyright Year	2004
Abstract	Tamarisk (Tamarix ramosissima Ledeb., T. chinensis Lour.), a pernicious invader of riparian areas in the western U.S., is often considered to be allelopathic by virtue of an ability to exude salt from its leaves. However, there is no evidence demonstrating allelopathy or even salinization of soils under tamarisk. We collected soil samples from beneath and just outside of tamarisk canopies at 12 sites along a 110-km reach of Fort Peck Reservoir in northeastern Montana. Samples were analyzed for electrical conductivity (EC), pH and concentration of several nutrients. Plants of western wheatgrass (Agropyron smithii Rydb.), the dominant herbaceous native plant in habitats invaded by tamarisk, were grown in the soil samples as a bioassay. We used principal components analysis (PCA) to explore how intercorrelated soil variables were affected by a tamarisk canopy. EC averaged more than twice as high under a tamarisk canopy than in the open. However, western wheatgrass plants growing in tamarisk-affected soil were 73% larger than those in unaffected soil. PCA analysis indicated that soil beneath a tamarisk canopy had higher values along a gradient of increasing EC and total inorganic N and decreasing pH and NH 4 + /NO 3 − ratio. This same gradient was also associated with increasing growth of the bioassay. We hypothesize that this fertilization was due to leaf secretions and/or leaf fall, possibly by increased input of nitrogenous organic compounds or increased P solubility. Our study provided no support for an allelopathic effect of tamarisk.
Starting Page	357
Ending Page	365
Page Count	9
File Format	PDF
ISSN	0032079X
Journal	Plant and Soil
Volume Number	267
Issue Number	1-2
e-ISSN	15735036
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	2004-01-01
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	allelopathy invasive plants Montana riparian saltcedar tamarisk Plant Sciences Ecology Plant Physiology Soil Science & Conservation
Content Type	Text
Resource Type	Article
Subject	Soil Science Plant Science

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