What are the production conditions and characteristics of tropical migratory agriculture and river v

Migration agriculture is an ancient, relatively primitive way of agricultural production. There is no fixed farmland for this type of farming, and the arable land is selected in areas with lush forests and meadows, and farmers cut down and burn it, that is, slash-and-burn. Clear a piece of land in the forest and grow crops using primitive methods.

When the fertility of the soil in this land decreases and no plants can grow anymore, farmers abandon it and develop another piece of land, so it is called migration agriculture. This kind of agriculture is prone to soil erosion, which leads to the destruction of the ecological balance. Nowadays, migratory agriculture is mainly distributed in lowland, hilly areas of tropical rainforest areas.

Distribution area: The Amazon River Basin in South America, the Congo Basin in Africa and other sparsely populated tropical forests and their marginal areas. The crops grown in migration agriculture vary.

Agriculture developed in the valley area is called valley agriculture. The valley area in the high mountain area, due to the higher terrain and low mountain area, the temperature is higher, the frost-free period is longer than the mountain, the precipitation conditions are better, the river water can be used as an irrigation water source, the mountains between the river valleys generally have forests, so that the humus of the valley soil is richer, the soil is more fertile, it is a suitable area for cultivation in the mountainous area, and the agriculture in the valley area is developed, which is called the valley agriculture. For example, the Yellow River Valley and the Huangshui Valley in Qinghai Province are typical river valley agricultural areas and are the main farming areas in Qinghai Province.

The Brahmaputra Valley is also a river valley agriculture. It is also found in the Tibetan Plateau region.

Primitive migration agriculture is mainly distributed in tropical rainforest climate zones. The tropical rainforest climate zone is mainly distributed in the Amazon River basin in South America, the Congo basin in Africa, and the Malay Archipelago in Southeast Asia. Migration agriculture is an ancient, relatively primitive way of agricultural production.

There is no fixed farmland for this type of farming, and farmers first cut down all the trees on the ground, sometimes cutting off a ring of bark for some large trees, leaving it to die, and then cutting it down. After the dead or dried trees were burned by fire, the peasants cleared a piece of land in the forest, dug small pits with digging sticks or hoes, put in a few seeds, and buried them in the soil to obtain food from natural fertility. When the fertility of the land decreases, it is abandoned and another piece is developed, so it is called migration agriculture.

In the past, migratory agriculture was widely distributed. Today, it is a type of agriculture practiced by some indigenous tribes, only found in the lowlands and hilly areas of the rainforest regions of South America, Africa and Southeast Asia. Some ethnic minorities in Hainan Island and Yunnan also adopt this farming method.

China calls this mode of production "slash-and-burn", which vividly and vividly expresses the characteristics of this mode of production.

The location factors of migration agriculture in the hot vertical zone are mainly divided into the following aspects:

1. Natural location factors: tropical rainforest climate zone, the climate is hot and rainy all year round, and the vegetation residue is densely disturbed.

2. Socio-economic location factors: manpower is the driving force, no animal power is used, rarely used, tool production technology is extremely simple, no fixed land, migration and planting.

Migration agriculture mainly refers to animal husbandry, where the growth of pastures changes with the seasons and pastures move with them.

Grasslands are mainly found in temperate continental climate zones.

North central Eurasia, northern North America, southern South America.

Tropical rainforest.

Amazon River Basin.

Answer B Primitive migration agriculture is characterized by the rotation of land rather than crops. Its main production feature is "slash-and-burn".

Tropical rainforest climate zone, Congo Basin in Africa, Amazon Plain in South America.

The main distribution areas of tropical migratory agriculture in the following groups of regions are:

a Latin America, South-East Asia, Africa.

bLatin America, East Asia, South-East Asia.

c Australia, New Zealand, South Africa.

dSoutheast Asia, West Asia, Australia.

Correct Answer: a

Migration agriculture mainly refers to animal husbandry, and the pastures change with the seasons.

Temperate continental climate.

It is mainly distributed in north-central Eurasia, northern North America, and southern South America.