Why is the soil in the south red?

Due to the lack of alkali metals and alkaline earth metals, it is rich in iron and aluminum oxides, showing acid red.

Red soil is also called red soil. There are many four-coordinated and six-coordinated metal compounds in general red soil, including iron compounds and aluminum compounds. Iron compounds in laterite often include limonite and hematite, and laterite contains a lot of hematite.

Many compounds are washed away when rain washes away. Iron oxide (aluminum) is the most difficult to dissolve (the solubility is 10-30 power), but it will coat clay particles layer by layer in the crystallization process to form particle clusters, which are not easily destroyed by rain. Therefore, red soil develops well under the erosion of rain.

Extended data red soil plateau

Historically, Yunnan has always been known as the red soil plateau, named after the widespread distribution of red soil in the territory. This red soil plateau has nurtured children of all ethnic groups in Yunnan.

On this red soil plateau, the reddest and largest red soil belongs to Dongchuan red soil centered on Huashitoushe, Huagou Village, Xintian Township, Dongchuan District, Kunming. The red land in Dongchuan, Yunnan Province is considered by experts to be the most magnificent red land in the world except Rio de Janeiro, Brazil, and the scene is more magnificent than that in Brazil.

Dongchuan has a history of copper smelting for many years. The soil here is bright red because of copper, and because of copper smelting in previous dynasties, too many trees are cut down on the mountain, and a large amount of red soil is exposed, forming a large red.

It has attracted many tourists, especially has become a fever-level photography resort for Chinese and foreign photographers to capture the most beautiful shots. In the terraced fields and on the red soil, foreign wheat flowers, buckwheat flowers, rape flowers and radish flowers bloom alternately all year round, with dazzling colors and bright and strong color blocks spread all the way to the horizon. September to 65438+February is the best season to enjoy the red land.

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