Regeneration of native trees in the presence of invasive saltcedar in the Colorado River Delta, Mexico

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Show simple item record Nagler, PL Hinojosa-Huerta, O Glenn, EP Garcia-Hernandez, J Romo, R Curtis, C Huete, AR Nelson, SG 2010-05-28T09:46:04Z 2005-12
dc.identifier.citation Conservation Biology, 2005, 19 (6), pp. 1842 - 1852
dc.identifier.issn 0888-8892
dc.identifier.other C1UNSUBMIT en_US
dc.description.abstract Many riparian zones in the Sonoran Desert have been altered by elimination of the normal flood regime; such changes to the flow regime have contributed to the spread of saltcedar (Tamarix ramosissma Ledeb.), an exotic, salt-tolerant shrub. It has been proposed that reestablishment of a natural flow regime on these rivers might permit passive restoration of native trees, without the need for aggressive saltcedar clearing programs. We tested this proposition in the Colorado River delta in Mexico, which has received a series of large-volume water releases from U.S. dams over the past 20 years. We mapped the vegetation of the delta riparian corridor through ground and aerial surveys (1999-2002) and satellite imagery (1992-2002) and related vegetation changes to river flood flows and fire events. Although saltcedar is still the dominant plant in the delta, native cottonwood (Populus fremontii S. Wats.) and willow (Salix gooddingii C. Ball) trees have regenerated multiple times because of frequent flood releases from U.S. dams since 1981. Tree populations are young and dynamic (ages 5-10 years). The primary cause of tree mortality between floods is fire. Biomass in the floodplain, as measured by the normalized difference vegetation index on satellite images, responds positively even to low-volume (but long-duration) flood events. Our results support the hypothesis that restoration of a pulse flood regime will regenerate native riparian vegetation despite the presence of a dominant invasive species, but fire management will be necessary to allow mature tree stands to develop. ©2005 Society for Conservation Biology.
dc.language eng
dc.relation.isbasedon 10.1111/j.1523-1739.2005.00234.x
dc.title Regeneration of native trees in the presence of invasive saltcedar in the Colorado River Delta, Mexico
dc.type Journal Article
dc.parent Conservation Biology
dc.journal.volume 6
dc.journal.volume 19
dc.journal.number 6 en_US
dc.publocation United States en_US
dc.identifier.startpage 1842 en_US
dc.identifier.endpage 1852 en_US SCI.Faculty of Science en_US
dc.conference Verified OK en_US
dc.for 0705 Forestry Sciences
dc.personcode 108636
dc.percentage 100 en_US Forestry Sciences en_US
dc.classification.type FOR-08 en_US
dc.edition en_US
dc.custom en_US en_US
dc.location.activity en_US
dc.description.keywords Fire
dc.description.keywords Flood flows
dc.description.keywords Invasive species
dc.description.keywords Populus
dc.description.keywords Riparian
dc.description.keywords Salix
dc.description.keywords Tamarix
dc.description.keywords Wetlands
pubs.embargo.period Not known
pubs.organisational-group /University of Technology Sydney
pubs.organisational-group /University of Technology Sydney/Faculty of Science
pubs.organisational-group /University of Technology Sydney/Strength - C3
utslib.copyright.status Closed Access 2015-04-15 12:17:09.805752+10
pubs.consider-herdc false
utslib.collection.history Uncategorised (ID: 363)
utslib.collection.history Closed (ID: 3)

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