| Summary: | 碩士 === 國立中興大學 === 水土保持學系 === 88 === The loose structure and the bad glued cobbles of Gravel Red Soil often causes serious disaster when there is a torrential rain. By the usage of hydroseeding to protect the slope can speed the process of project and beautify the environment. Expecting a good protective effect on slope in the initial time of projecting depends much on the cohesive agent. CMC, paint, concrete are selected as the main materials of cohesive agent in this research and mix up nine different proportions of cohesive agent solution(cross mixture of CMC, CMC and paint, CMC and concrete resulting in the respective 0.5%, 1%, 2% proportions) and uses Bermuda grass, Bahia grass, Rhodes grass as the primary experimental plants to probe the cohesive agent affecting on protective effect of slopeland surface and initial growth of plants. Hoping to offer the reference in the hydroseeding project hereafter. The summary of initial researching conclusion is as follows:
1 With the raising concentration of the cohesive agent
solution, the germination percentage of experimental plants becomes lower. In whatever concentration of cohesive agent solution, the germination percentage of Rhodes grass is the best while Bermuda grass and Bahia grass follow orderly.
2 Among the nine proportions of cohesive agent solution, the mixture of CMC and concrete possesses the best anti-erosion effect. Under the experimental condition if rainfall(110mm/hr) the time needed to wash away the cohesive agent solution beneath the 1.2cm deep soil is almost 2.5 times in comparison with the contrast one.
3 According to the siltation quantity measured by the observation stake in the testing area. The siltation quantity of the hydroseeding one is of small amounts whereas the contrast one collapses slightly. It shows that the cohesive agent truly functioned to protect the slope .
4 After probing into the hydroseeding in the field experimental area for eleven months, the effect is good by the over 80% average cover rate . Among the testing plants, siratro, Rhodes grass, Bermuda grass possess higher IV quantity whereas Japanese silver grass and Bamboo leaf grass possess superior degrees among invasive plants.
5 Upon proceeding hydroseeding on the gentle slope of Gravel Red Soil, the mixed cohesive agent solution of CMC and concrete( the 2% one) accompanies Bermuda grass, Bahia grass and woody native trees that fit the local soil and climate are suggested as the main hydroseeding materials.
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