题目内容

Plants can selectively absorb the nutrient elements which are dispersed in the parent material, water and atmosphere, accompanied by the availability of mineral nutrient elements.

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The stratification of parent material (heterogeneous parent material) has a more complex influence on the material migration and soil fertility, compared with homogeneous parent material. The stratification of parent material will be inherited to soil.

The large cycle is the storage and accumulation process of nutrients, while the small cycle is the leaching process of nutrients.

Loess is the parent material for hills in the west of Jiangsu province, especially from Nanjing to Zhenjiang.

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.