Relationship between soil and water quality
What kind of minerals there are in that area, within a few kilometers of this radius, its water has this kind of quality.
Therefore, the water quality of each area is different. The nearby soil contains arsenic minerals, and its water quality contains arsenic. Therefore, if local people drink well water, they will develop black feet. The water quality of Taoyuan and Miaoli is very prone to stomach problems. The area seedlings are red and silver. The water quality produced in this place will be easy to stomach disease. Why? It has too much mineral iron, but it does not produce iron ions. Therefore, in order to have a very successful natural ecology, there is a tree called Acacia. The natural ecology of Taozhumiao is very successful. There is acacia, because the red and silver soil of Taozhumiao is very barren, just as the acacia tree is legume. Mimosa family, whose flowers are like mimosa, the roots of legumes can fix nitrogen in the air, and it succeeds.
So the Taozhumiao area is very barren, but the local people's life pattern is not poor, because they can make the acacia tree into a charcoal kiln to burn it into charcoal. In the past, people who had money in Taipei burned charcoal. The charcoal was probably supplied from Taozhumiao, because rich people don’t like to burn coal. The smoke of coal is too big, it tastes really bad. The coal contains sulfur, and the smoke will smell bad and it will feel very sad. There is no charcoal, pure carbon. Now scientists think that the wood from the dry sulfur, after the water molecules have been driven away, is quite good.
Then Acacia has a very good feature. As long as it is one and a half feet away from the ground, it will germinate when it is sawed. As long as it rains in the northwest after the germination, Once Thunder, In a few years, there is such a big root. It is not necessary to go to plant again. If the cypress of the Taiping Mountain in Yilan is long enough to be able to cut, it will take at least 800 years to be beautiful some might take two thousand years.
