A REVIEW OF THE REMOVAL OF ARUNDO DONAX FROM A RIPARIAN AREA WITHIN SAN TIMOTEO CANYON

<p>A site within San Timoteo Canyon was revisited, 13-14 years after treatment, to look at long-term effects of <em>Arundo donax</em> removal. The data obtained were used to determine whether<em> A. donax</em> had re-invaded, other non-native species had established the area, or if native species were able to grow in place of the removed <em>A. donax</em>. The previous removals included a combination of grinding large patches of <em>A. donax</em> and then foliar spraying, foliar spraying of uncut plants, and direct spraying of hand cut stems, depending upon the location and size of the plant. The effects of the <em>A. donax</em> removals within San Timoteo Canyon were analyzed in relation to new percent cover of the plant species, other more recent removals, and areas that did no experience removal procedures. The project included the use of data provided by the Inland Empire Resource Conservation District (IERCD) as well as the collection of data from randomized plots to generate plant species percent cover. Plant percent cover data analyzed for this paper had been collected from eight 15 by 15 foot randomly selected plots within an overall project site of 42.3 acres. Additional sites were used to investigate what can happen if <em>A. donax</em> is not removed from an area into which it has been introduced., the short-term effects of <em>A. donax</em> removal methods, and the role the ever-changing characteristics of riparian areas can play in their own restoration. These additional sites included aerial photographs supplied by IERCD of an ecologically similar area, a plot with a more recent <em>A. donax</em> removal date, as well as photographs and data of a site subject to natural recovery. Based on these comparisons it is concluded that the treatment methods used led to a lessened presence of <em>A. donax</em>, and that other invasive species did not grow in its place. Further, as the removal procedures within the project area occurred approximately 13 to 14 years prior, it can be concluded that there is no regrowth of <em>A. donax</em> and that many native species have been able to re-inhabit those areas previously infested by <em>A. donax</em>. The treatment methods used were successful without the need to continually disrupt the habitat and allowed for the habitat to recover naturally once the invasive species had been removed.</p>

Name thesis:degree_name

Master of Science in Earth and Environmental Sciences

Level thesis:degree_level

Project

Discipline thesis:degree_discipline

Geological Sciences

Year dc:date.available

2014

Author dc:creator

• Howe, Catherine E

Contributors dc:contributor

• Joan Fryxell

• Arundo donax
• riparian
• restoration
• San Timoteo Canyon
• invasive species
• Ecology and Evolutionary Biology
• Plant Sciences

Repository record dc:identifier

https://scholarworks.lib.csusb.edu/etd/106

OAI identifier oai:identifier

oai:scholarworks.lib.csusb.edu:etd-1108