| Summary: | 碩士 === 國立中興大學 === 園藝學系所 === 102 === Tree root could absorb water and store nutrients, it is the important function to maintain the growth of tree. And the growth of root is closely related with the soil conditions because soil could provide water, nutrients, air and other essential substances, while provide space for root to grow. This thesis calls the soil that allow tree root grow better is "effective soil."
Management of trees in public space is important to maintain environmental quality and public safety. Invalid soil could cause the negative growth of root, and let the growth potential decline, thus increasing the possibility of falling. Therefore, to management of trees, the effectiveness of the soil in public green space is an important issue.
In this experiment, we use food coloring Brilliant Blue FCF to detect effective soil of public space. After pouring dye, we dug and observe distribution of dye between soil poles and how did roots grow in potholes. Used Yamanaka’s soil hardness tester to detect the soil hardness then analyzed soil texture. We could clearly observe the flow path of dye between soil pores by using this dye. So we think that this method is a quickly and convenient way to detect effective soil. The experiment hold in three places, National Chung Hsing University, Taichung park and National Museum of Natural Science, and respectively test six points in each place. After experimenting, we found that average depth in National Chung Hsing University of six points is 13 cm; the average depth in Taichung park is16 cms ; and the average depth in National Museum of Natural Science is 21 cm.
To summarize experiments observation and data, cone index will make the soil density becomes higher because of outside exerting pressure, thus hardly to permeate. Regardless of what soil texture, it is hard to bring water to the bottom of soil if there is no continuity soil porosity. When the surface of soil pore is because of smaller space and it is hard to penetrate by gravity, it will diffuse by capillary water. Moreover, we discovered the deeper, the hard of soil. Speculated that soil public sites because early construction, mechanical rolling deep soil, resulting in increased hardness of deep soil.
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