广西弄拉峰丛山区土壤有机质与微量营养元素有效态

以广西弄拉峰丛山区为例探讨岩溶区偏碱性条件下土壤有机质与有效态养分含量之间的相关关系。结果表明土壤有机质可显著影响有效态养分含量。主要微量营养元素的有效态多大于其缺素临界值,但存在潜在缺素的可能性。有机质与有效态锌、铁和硼均存在三种函数类型的正显著水平相关关系,反映出土壤有机质与它们的关系密切且稳定。说明有机质含量的增加,有利于提高有效锌、铁和硼的含量。前两者以指数函数类型建立的回归方程最好,后者以幂函数类型建立的回归方程最好。有效态锰与有机质较符合幂函数方程,呈显著负相关。 

SOIL ORGANIC MATTER AND THE CONTENTS OF AVAILABLE MICRONUTRIENTS IN SOILS FROM KARST MOUNTAIN IN NONGLA, GUANGXI

Taking a typical karst mountain area,Nongla in Guangxi as an example,the correlation between soil organic matter and the content of available nutrients in selected soils was discussed in this paper.The results showed that soil organic matter under alkaline soil condition may affect remarkably the content of available nutrients.Generally,the available state of the major nutrient elements is larger than their critical value for plant with potential nutrient deficiency.Significant positive correlation(linear,exponential,and power function) exhibited between organic matter and available Fe,Zn,and B.It showed that the close relationship between organic matter and micronutrient elements,i.e.the availabilities of micronutrient elements will be improved by the increase of soil organic matter.The former(Fe,Zn) two accorded with exponential function equation,and the latter(B) power function equation.Negative correlation between available Mn and organic matter presented at 0.05 significant level,and also accorded with power function equation.