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標題: A Evaluation of the Effectiveness of Biopolymer (Xanthan gum) on Sand Fixation in the Coastal Area
關鍵字: 三仙膠;定砂;防風林
出版社: 水土保持學系
In recent years, because of the fast development of economy, high pressure of population and increasing demand of lands make the migration of people toward the seacoast. Unfortunately, even if there are the barriers of windbreaks, the existing rate of the windbreak-seedling becomes extremely low because of the accumulation or abrasion of flying sands in the monsoon season. Therefore, avoiding flying sands plays an important role in the building of windbreaks.
This study focuses on the application of Xanthan gum at the seashore areas through probing into the efficiency of sand fixation, application, and germination. The best concentration of application can be inferred from the three inquiries. The results are summarized as follows: First, the uniform distribution of Xanthan gum in the top of soil layers shows the significant efficiency of sand fixation. In the time period test, the protect layers that used 0.05% Xanthan gum is easy to break because the protect strength is low after 2 months. Second, the higher concentration of Xanthan gum used, the harder the Xanthan gum applied. But we have to notice that the lower the concentration of Xanthan gum, the weaker the strength of protect layers. Thus, the weaker protect layers is not strong enough to fix sand. Third, the germination rate descends slightly and the germination is sluggish for the applying concentration of Xanthan gum up to 0.2%. Sprayed the Xanthan gum in the sand with the concentration rises, pH will descends slightly that shows using Xanthan gum in coastal area can buffer the threaten of high pH. It is good for plants .
It is suggested that the area which allow vegetation intrude do not use more than 0.2% Xanthan gum on sand fixation. If the water supply is sufficient, the concentration of Xanthan gum can be reduced to 0.05% and the vegetation seeds can be mixed with Xanthan gum to spray. In early stage, the ability of sand fixation of Xanthan gum can decrease the damage of flying sands on the germination of Bermuda grasses. After the germination of Bermuda grasses , the root system of grasses can play the role of sand fixation instead.

Appears in Collections:水土保持學系

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