Help me compare the regional differences between tropical rain forest and tundra from the aspects of climate, hydrology, soil and biology, and the reasons.

1. Climate: The tropical rain forest belt belongs to the tropical rain forest climate. Reason: Controlled by equatorial depression all the year round, updraft prevails. Features: High temperature and rainy (multi-convective rain) all year round, forming equatorial rain belt. Tundra zone belongs to the polar tundra climate, which is caused by the dry and cold polar easterly winds prevailing all the year round. Features: It is cold all year round with little precipitation, belonging to the polar rainless zone. 2. Hydrology: The water tropical rain forest belt is rich, forming many rivers with large flow, such as Amazon River in South America and Congo River in Africa. Reason: It is hot and rainy all year round, and the water cycle is active. The rivers in tundra zone are underdeveloped, but there may be rivers flowing from low latitudes, such as ob river, Yenisei and Lena in Siberia, which flow into the Arctic Ocean through tundra zone. Glaciers may be distributed on the local surface, and there may be frozen soil underground. Most water resources exist in solid form. Reason: The temperature is extremely low and precipitation is scarce. 3. Soil: The typical soil in tropical rain forest belt is acid latosol, which is very barren and is not conducive to agricultural production. Many economically backward areas use extensive slash-and-burn methods to develop tropical rain forest migration agriculture in plant ash after burning wasteland. Reason: Rainfall in tropical rain forest belt is heavy, which has strong leaching effect on soil, and a large number of water-soluble elements are leached out. Hydrolysis of water-insoluble iron and aluminum elements is obvious acidity of soil. The typical vegetation in tundra zone is barren glacial swamp soil, with shallow soil layer and thick organisms (moss) on the surface, which quickly transits to thick humus layer, mainly fulvic acid. The whole body is wet, showing acid to strong acid reaction. The substitution amount of alkali salt is very low. The use value is not high. Biology: The typical vegetation in the tropical rain forest belt is the tropical rain forest, and the typical animals are orangutans and hippos. Typical vegetation in tundra zone is moss, lichen and other tundra vegetation, and typical animals are reindeer and arctic fox.