To Investigate the Establishment, Subsequent Growth
and Erosion Control Potential of Certain Tree & Shrub
Species on Gully and Stream
A. Skepasts, Head, Agronomy Section, NLCAT, Principal Researcher
- To show how gulley/stream bank stabilization
will prevent further erosion and consequent loss of arable soil.
Little information is available regarding the effectiveness of tree
or shrub species in stream bank/gully erosion control.
- Loss of soil due to gully and stream
bank erosion will be prevented, land slides curtailed and stream
bed silting will be reduced.
Three of the four species planted in
1989 established successfully. The rather poor establishment of snowberry
may have resulted from dry weather during and following transplanting.
By the spring of 1993, Norway spruce appeared to have suffered severe
dieback, possibly due to the unusual weather during the fall and winter
of 1992. The two remaining species, red osier dogwood and highbush cranberry
appear to have survived. Data showed that highbush cranberry increased
in height rapidly in the two years after transplanting, while both species
rapidly increased in width.
Erosion of the gully bank due to surface
runoff was not a serious problem during the course of this project.
The tree and shrub cover, along with existing grasses, protected the
slope from rainfall and spring runoff. In addition, the surviving species
are providing cover for wildlife in the gully.
Slipping of the gully bank was apparently
a result of streambank undercutting. This is largely a natural occurrence
where streams flow through clay gullies; however, the actions of beavers
may have increased streambank erosion in this case. Erosion control
structures along the streambank would be required to control the undercutting
and hence eliminate the slipping of the gully banks.
Tuesday, May 10, 2011 01:01:36 PM