辽南低山丘陵区棕壤剖面特性研究

采用野外土样采集和室内实验测试相结合的研究方法,对辽南低山丘陵区典型的棕壤剖面主要理化特性进行了初步研究.结果表明,(1)辽南低山丘陵区棕壤剖面有4个发生层,且层次分异比较明显.(2)辽南低山丘陵区棕壤剖面物理特性的变化趋势为,土壤剖面尤其是中部剖面粘土颗粒所占比例较大,土壤保水性强,通气性差;自腐殖质层比重由上而下增大,可见土壤剖面的有机质含量由上而下逐渐减少,有机层比重较腐殖质层大些,说明人为干扰强烈.(3)辽南低山丘陵区棕壤剖面化学特性的变化趋势为,有机质含量从上到下依次递减,越向下差异越小,全磷则有递增趋势,越向上差异越小.

Research on soil profile characteristics of brown soil in hilly areas of Liaonan

By the way of adopting the research method of combining gathering the soil of the field with indoor experiment and testing,have done some preliminary study on the main physicochemical characteristics of brown soil profile in the hilly areas of Liaonan.The outcomes indicate that:(1) There are four genetic horizons on the profile of brown soil in the hilly area of Liaonan,which differ from each other.(2) The tendency of the physical characteristics of the brown soil profile in the hilly areas of Liaonan is as follows.The particles of clay account for a large proportion especially in the middle part of the soil profile,and the soil is of better retention of water and poorly aerated.The proportions of humus increase from top to bottom,indicating that the contents of organic matter decrease by the way.The organic horizon takes a larger proportion than the humus layer,which illustrates that strong man-made interference exists.(3 ) Concerning the chemical properties,the contents of organic matter reduce progressively from the top down,and therewith the difference becomes obscure while the total phosphorus increases by degrees with less diversities in the upper.