摘要
我国土壤地球化学特征受生物、气候、母质、地形及人为作用等因素影响，形成了我国独特的土壤地球化学类型和分布格局。不同地球化学类型，均有各自的元素丰度。土壤中元素与植物生长和人体健康的关系取决于土壤中元素的有效部分。影响土壤元素的有效性除受元素的赋存状态影响以外，还受ｐＨ、Ｅｈ和人为耕作施肥活动等因素的影响。根据土壤地球化学分布格局和类型，因地制宜、因土种植、合理施肥，对我国农业的持续发展有很大意义。
Pedogeochemistry in China is affected by the factors such as bio climate, parent material, topography and human activities, forming the various geochemical types, including clastic soils, saline soils, gypsic soils, carbonate soils, siallic soils, ferrallic soils and ferrolysed soils, and the spatial distribution of soil geochemical regions which include saline, carbonate, siallic and ferrallic regions from northwestern to southeastern China. The different pedogeochemical type has its own different element abundance that depends on the spatial distribution of soil types. In the saline soil region, available Na, K, B, F, and Cu in soils are rich, but available P, Zn, Fe, Mn and I are deficient. sixty three percent of the region are deficient in P, 80% in Zn and Mn, and 50% in Fe. In the carbonate soil region, available K and B are still rich, but available Zn, Fe, Mn, Mo, I and Se are deficient. On the basis of statistics, about 60% of the region are deficient in P, and 80% in Zn, Mn, Fe and Mo. In the siallic soil region, deficiency of K, B and F is gradually evident, but the area of deficiency in Zn, Mn, Fe, and I decreases. Thirty two percent of the region is deficient in K, and 47% in P. In the ferrallic soil region, available K, B, Mo and F are lack due to strong leaching, on the contrary, available Zn, Mn, Fe in the region are more sufficient than those in the other regions. The toxic of Fe and Mn in some soils even appears. Fouty six percent of this region is inadequate in P, 60% in K, and 90% in B, Mo and F. In a word, the availability of elements are affected by pH, Eh and fertilizing activity besides the states of elements. On the basis of the soil geochemical distribution and types, rational plantation, application of fertilizer to soil types and rational utilization of soil nutrition will be of great significance in raising the yield and improving the quality of agricultural products. Authors suggest that fertilizers be utilized on the basis of soil geochemical characteristics, types, pH, Eh and special necessity of plants.
出处
《地理科学》
CSSCI
CSCD
北大核心
1998年第1期1-9,共9页
Scientia Geographica Sinica
基金
国家攻关项目
关键词
土壤
地球化学
农业生产
元素丰度
施肥
Pedogeochemistry
Distribution of elements
Agricultural production
