deposit_your_work

Herbivore-induced changes in plant carbon allocation: Assessment of below-ground C fluxes using carbon-14

Files in this item

Files Size Format View
1996Holland_Oecologia.pdf 4.455Mb application/pdf Thumbnail

Show simple item record

Item Metadata

dc.contributor.author Crossley, D.A. Jr
Cheng, Weixin
Holland, J Nathaniel
dc.date.accessioned 2008-09-18T16:46:03Z
dc.date.available 2008-09-18T16:46:03Z
dc.date.issued 1996-03
dc.identifier.uri http://hdl.handle.net/1911/21698
dc.description journal articel
dc.description.abstract Effects of above-ground herbivory on shortterm plant carbon allocation were studied using maize (Zea mays) and a generalist lubber grasshopper (Romalea guttata). We hypothesized that above-ground herbivory stimulates current net carbon assimilate allocation to below-ground components, such as roots, root exudation and root and soil respiration. Maize plants 24 days old were grazed (c. 25-50% leaf area removed) by caging grasshoppers around individual plants and 18 h later pulse-labelled with 14CO2. During the next 8 h, ~4C assimilates were traced to shoots, roots, root plus soil respiration, root exudates, rhizosphere soil, and bulk soil using carbon-14 techniques. Significant positive relationships were observed between herbivory and carbon allocated to roots, root exudates, and root and soil respiration, and a significant negative relationship between herbivory and carbon allocated to shoots. No relationship was observed between herbivory and 14C recovered from soil. While herbivory increased root and soil respiration, the peak time for ~4CO2 evolved as respiration was not altered, thereby suggesting that herbivory only increases the magnitude of respiration, not patterns of translocation through time. Although there was a trend for lower photosynthetic rates of grazed plants than photosynthetic rates of ungrazed plants, no significant differences were observed among grazed and ungrazed plants. We conclude that above-ground herbivory can increase plant carbon fluxes below ground (roots, root exudates, and rhizosphere respiration), thus increasing resources (e.g., root exudates) available to soil organisms, especially microbial populations.
dc.description.sponsorship National Science Foundation
dc.language.iso eng
dc.publisher Springer-Verlag
dc.subject root exudates
rhizosphere respiration
photosynthetic rate
carbon allocation
herbivory
dc.title Herbivore-induced changes in plant carbon allocation: Assessment of below-ground C fluxes using carbon-14
dc.type Article
dc.type.dcmi Text
dc.identifier.citation Crossley, D.A. Jr, Cheng, Weixin and Holland, J Nathaniel. (1996). "Herbivore-induced changes in plant carbon allocation: Assessment of below-ground C fluxes using carbon-14."

This item appears in the following Collection(s)