http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Using seeds to establish vegetation in constructed freshwater marshes
xvi, 182 leaves : illustrations ; 28 cm.
The feasibility of using seeds instead of vegetative
transplants for establishing vegetation in constructed
freshwater wetlands on the upper Texas coast was evaluated.
Species examined consisted of Carex cherokeensis, Cyperus
virens, C. pseudovegetus, Echinochloa crusgalli, E. walteri,
Polygonum hydropiperoides, Rhynchospora corniculata, R.
globularis, Rumex crispus, Sagittaria lancifolia, Scirpus
pungens, and Sesbania macrocarpa. Seed germination in
response to presence or absence of stratification and
scarification with sprinkled or sprinkled/saturated water
regimes was evaluated in a controlled outdoor growth
environment. Seed germination in a constructed wetland was
evaluated in response to stratification and scarification
(presence/absence) with sprinkled or inundated water regimes
(-3, 2, 7, 12, 17, and 22 cm flooding depths). Growth and
survival of wild-collected and container grown transplants
were evaluated at 6, 11, 16, 21, 26, and 31 cm water depths.
In the growth environment, three species germinated well. C.
virens germinated better in the wettest treatment, while E.
crusgalli germinated best in the drier treatment. For S.
macrocarpa, with its hard, waxy seed coat, scarification
significantly increased germination of S. macrocarpa. In the
constructed wetlands lack of constant soil moisture (in the
sprinkled treatment) or excessive depth of flooding
apparently caused poor germination in all study species
except E. crusgalli, R. crispus, and S. macrocarpa. Best
germination was without or with minimal (2 cm) flooding.
Little germination occurred in water depths greater than 2
cm. As before, scarification significantly increased
germination of S. macrocarpa. Transplants of several of the
study species were able to tolerate a wide variety of
hydrologic regimes, with S. lancifolia and S. pungens being
the most adaptable. For deeper habitats, P. hydropiperoides
did fairly well, while R. corniculata and C. pseudovegetus
did well at the shallower depths. C. cherokeensis and R.
globularis were not Suitable for the water depths studied.
For the Echinochloa species, it appears to be important that
the water level be maintained below the tops of the plants
while they are immature. Overall, of the species studied, E.
crusgalli and S. macrocarpa, both annuals, were best suited
for seeding constructed wetlands due to their relatively high
germination percentages and rapid germination and growth.
"Major Subject: Rangeland Ecology and Management".
Issued also on microfiche from University Microfilms Inc.
Includes bibliographical references: pages 147-164.