Magill, Emily , Ritter, Nur , Constable, John .
Restoration implications based on growth characteristics of invasive and native plant species.
THE lack of effective seeding strategy and invasive species dominance produce poor establishment of native plant communities on retired agricultural soils in the San Joaquin Valley. Examination of different mechanical seeding protocols for establishing native annuals (Grindelia camporum, Hemizonia pungens, Layia glandulosa, and Phacelia ciliata) and perennials (Atriplex polycarpa and Suaeda moquinii) resulted in no differences in establishment. The lack of cultural effects and poor germination was compounded by growth of invasive species that often overtopped the natives. A greenhouse study examined growtth differences between the native species above and two abundant invasive competitors (Bromus madritensis and Brassica nigra). Each species was grown individually in a sand/potting mixture and harvested at 14d (n=10) and 32d (n=10). Photosynthetic characteristics were measured at ~25d using a LiCor Li-6400 gas exchange system. Data were analyzed using Kruskal-Wallis and Mann-Whitney U tests. At 14d, total mass of invasive species (0.005±0.0007g) was greater than both native annuals (0.003±0.0002g, P=0.006) and perennials (0.0007±0.00001g, P
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1 - California State University, Department of Biology, 2555 East San Ramon Ave. M/S SB73, Fresno, California, 93740-8034, USA
2 - California State University, Stanislaus, Endangered Species Recovery Program, 1900 N. Gateway Blvd., Suite 101, Fresno, California, 93727, USA
San Joaquin Valley
Presentation Type: Poster:Posters for Sections
Location: Auditorium/Bell Memorial Union
Date: Tuesday, August 1st, 2006
Time: 12:30 PM