Maybe,
In your impression, the color of
land is usually tan.
In fact,
the soil will also show a variety of different colors depending on the geographical location of the soil distribution.
Differences in parent material composition, topographic conditions, climate types and vegetation coverage result in different types of soil, and soil color can reflect changes in the internal properties of the soil. The difference in humus content and mineral composition in the soil will cause the soil to show different colors.
Black soil
is mainly distributed in the northeastern plains of our country. Because it is humid and cold here, the microbial activity is weak, and the organic matter in the soil decomposes slowly and accumulates more, so the soil color is darker. The particles of black soil are finer and uniform.
The reason is: the particle size of the soil parent material determines the properties of the soil, and black soil is mainly distributed in the Northeast Plains, where the terrain is flat and there are many flowing water or wind deposits on the surface. The particle size of the soil parent material, which is dominated by flowing water or wind deposits, is smaller. Thin and even.
Yellow soil
is mainly distributed in my country's Loess Plateau . The soil here is yellow because there is less organic matter in the soil.
When iron oxide interacts with water, it can be transformed into yellow hydrated iron oxide. The low-lying and humid environment is the suitable condition for this change. Therefore, in such places, the soil often appears yellow.
red soil
is mainly distributed in low mountainous and hilly areas south of the Yangtze River, as well as in southern Tibet and other places.
Iron oxide is a color master among soil minerals. When its content in the soil is high, the soil will be red or brown.
Purple soil
Purple soil is the most fertile natural soil in the south. The Sichuan Basin is the place where purple soil is most concentrated in the country, and is known as the "Purple Basin".
Purple soil is developed from purple sandstone and shale weathering and is rich in nutrients such as calcium, phosphorus, and potassium. The main determinants of its soil color are the crystalline iron oxide and manganese compounds contained in it.
White soil
is mainly distributed in the western region of my country. The soil in these places contains high levels of magnesium, sodium and other salts, and the saline soil and alkaline soil are often white.
White soil is closely related to changes in salt content in the soil. When salts such as calcium carbonate, sodium carbonate, sodium chloride, sodium sulfate, kaolin, aluminum hydroxide and other substances exist in the soil in powder form, they may cause the soil to deviate. white color.
Soil is the main support system for sustaining human life.
Protect the ecological environment.
Only by scientifically protecting soil can
develop green agriculture.
Improve agricultural production capacity.
Content source: Popular science in China. Pictures: Internet pictures.
Editing and production: Wu Liyan
Proofreading | Shi Ruobing Xu Hongxiatana
review | Alima
