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Around China's Dongting lake in Hunan province, Poyang lake in Jiangxi province, Taihu lake in Jiangsu province, the parent materials of soils are deposit sediments.

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Mechanical disintegration refers to the process that, under the effects of physical factors, including temperature changes, water freezing, gravel splitting, wind blowing, flowing water and glacier movement, rocks and minerals disintegrate into particles in different sizes and shapes without changing their chemical composition.

The research of soil chemistry is focused on soil solution chemistry, adsorption and desorption of elements at the solid-liquid interface, the composition and property of soil colloids, the structure, property and function of soil organic matter and minerals. It can provide theoretical bases for improving soil fertility and soil environment protection.

The decrease in area of arable land is in northwest or northeast China where the quality of arable land is better; the increase in area of arable land is in west and south China where the natural conditions are worse.

The current situation of soil resources in China is abundant arable land resources, adequate preserved soil resources, and large cultivated land area per capita.