Grassland soil

Interpretation

Prairie Soil refers to the soil developed under the meadow grassland and grassland vegetation in semi-arid regions.

Distribution

Grassland soil is widely distributed in temperate, warm temperate and tropical mainland, accounting for 13% of the world's land area, mainly distributed in Xiaoxing'anling and Changbai Mountain west, The Great Wall is north of the Great Wall, and the vast area of ​​Helan Mountain.

Soil type

in China, from east to the west, there is a black calcium soil, chestnium, brown calcium soil, in the warm temperate range in turn垆 垆, gray calcium soil.

Features

The common feature of the above grassland soil is: 1 soil leaching effect is weak, and there are calcified layers in the lower section; 2 soil salt substances are rich, exchanaly-based Saturation; 3 soil reactions are neutralized to alkali; 4 organic matter mainly enter the soil in the form of root form, so the ruccome content is gradually reduced downward.

Subbew Process

The main nuccolysis process of the grassland soil has the process of rot, but the contrast between the two is different, with the degree of drought Increase, the former weakened, the latter is strengthened. Due to lack of water, it is not very suitable for agriculture, but it is advisable to develop animal husbandry and is an important animal husbandry base.

The urinary accumulation process refers to the accumulation of humic materials in the soil under the action of various plants. It is the most common geotechnical process in soil formation. Due to the decomposition of vegetation, coverage, and organic matter, the characteristics of humicity accumulation are also different. The results of the intersive effects of the humus are differentiated, often form a dark humus layer in the upper portion of the soil.

Calcification process refers to the process of leaching and deposition of calcium carbonate in the soil. Under drought, semi-arid climatic conditions, the soil leaching is weak, which is most of the seasonal leaching, and the soluble salts are lost, while silicone aluminum iron is substantially no movement, and calcium is a chemical migration. element. The soil surface residual calcium and the plant decomposes the released calcium, moves downward in the rainy season, and the lower portion of the conditions is deposited in the form of calcium carbonate in the form of the conditions in the rainy season. The lower portion of the cross section is deposited in the form of calcium carbonate. Due to the difference in natural conditions (mainly climatic conditions), the depth and thickness of the calcium layer are different from the soil.