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cje ›› 2001, Vol. ›› Issue (6): 1-3.

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The Distribution Characteristics of Soil Potassium(K) Availability and Its Correlation with Plant Species Diversity in Forest Ecosystem of MtJinyun

Yang Wanqin, Zhong Zhangcheng, Tao Jianping, Xu Xiangying   

  1. College of Life Science, Southwest China Normal University, Beibei, Chongqing 400715
  • Received:2000-01-20 Revised:2000-04-03 Online:2001-12-10

Abstract: The distribution characteristics of soil available K and its correlations with plant species diversity in the forest ecosystem of Mt.Jinyun are studied in this paper.The results are as follows:①Except for shrub-grassland,the content of available K in soil profiles under different communities has an evident gradient,i.e.,A(humus horizon)>B(deposited horizon)>C(parent material horizon).②The content of available K in A and B horizons gradually increases along the successional direction,i.e.,shrub-grassland<Pinus massoniana pure forest<P.massoniana-Symplocos setchuensis mixed forest<evergreen broadleaved forest.This law does not exist in the C horizons.③Different degrees of correlations exist between the content of soil available K and plant species diversity.The correlation between species diversities of trees and grasses and the content of available K in A and B horizons is the most significant.

Key words: nitrification inhibitor, dicyandiamide (DCD), inhibition mechanism, inhibition effect, nitrogen fertilizer efficiency.

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