DISTRIBUTION CHARACTERISTICS OF NUTRITION ELEMENTS IN THE THREE GORGES RESERVOIR DISTRICT
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    Abstract:

    Based on test ing results of topsoils, distribut ion characteristics of plant-growth elements, such as N, P, K, Ca, Mg, S, B, Fe, Mn, Mo, and Cl etc, were discussed by types of soils and rocks, elevations, degrees of slope, and vegeta-tion covering.It can be concluded that calcareous soil is the highest in content of nutritional elements such as B, Ca, Mg, Mn, Mo, N, P, and Fe; where as yellow soil the lowest in content of nutritional elements, such as Ca, Mg, K, P, S, Cl, and Fe.Purple soils are the highest in content of P, K and Cl, but the lowest in content of N, Mo and S.Parent rocks play an important role in distribution of elements in soils.In the limestone area the soils are abundant in nutritional elements except for P, K, and Cl.On the other hand, in the sandstone districts the contents of most nutritional elements in the soils are lowest, but only Ca and B higher than that of greywacke district and siltstone district respectively, and Mo lower than that of the limestone area.Among soils formed from the mudstone, siltstone, greywacke, and sandstone, soils developed from mudstone are highest in most nutrition elements, such as K, Mg, Fe, B, P, and Mn, but relatively lower in Mo and N.The contents of nutritional elements in soils developed from siltstone are higher than those in soils developed from mudstone and lower than those from sandstone.In terms of the degree of slope, the contents of N, S, Mo, Fe, Mn, and P in the purple soils increase with the decline of the degree of slope, but the contents of Ca, Mg, and K do not show such a trend.When the elevation decreases, the contents of P and S in the purple soils increase remarkably, while Mn and Mo increase somewhat, and other elements show irregular change.When the parents, climate and topography are similar, the contents of elements in purple soils are determined by the types of plantcover.Soils in the mixed forest area and tussock area contain more nutritional elements relatively, than soils in the conifer forest area.In areas with little vegetation cover, the soils are higher in S and lower in B and Ca.

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Tang Jiang, Li Yong, Deng Fuyin, Fu Shaohong. DISTRIBUTION CHARACTERISTICS OF NUTRITION ELEMENTS IN THE THREE GORGES RESERVOIR DISTRICT[J]. Acta Pedologica Sinica,2005,42(3):473-478.

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History
  • Received:May 28,2004
  • Revised:December 15,2004
  • Adopted:
  • Online: February 25,2013
  • Published: