南亚热带三种典型人工林土壤微量元素全量与有效量特征

Characteristics of Total and Available Contents of Soil Microelement at Three Typical Plantations in Southern Subtropical China

以位于广西凭祥市的中国林业科学研究院热带林业实验中心伏波试验场的外来速生树种桉树、乡土阔叶树种红椎和乡土针叶树种马尾松3个树种的人工林为研究对象,探讨了土壤微量元素(Cu、Fe、Zn、Mn)全量及有效含量在不同林分类型不同土层深度(0-20cm、20-40cm、40-60cm)间的差异。结果表明,红椎林、马尾松林和桉树林土壤微量元素全量均与土层没有显著相关性,且在各土层间的分布没有一致规律。相同土层不同树种人工林间,4种微量元素全量都大致表现出桉树林高于红椎林和马尾松林的趋势;除了有效Fe含量表现出马尾松林高于红椎林和桉树林外,其余3种土壤微量元素有效含量均为桉树林最高。相同林分不同土层间,3种人工林的4种微量元素有效含量均大致表现出土壤表层>中层>底层的特点。

The total and available contents of soil microelement(Cu,Fe,Zn,Mn)with the topsoil(0-20cm),middle soil layer(20-40cm)and subsoil(40-60cm)in the three monoculture plantations of Eucalyptus(an extraneous fast-growing tree species),Catanopsis hystrix(a native broadleaved tree species)and Pinus massoniana(a native coniferous tree species)from the Experimental Centre at Tropical Forestry of Chinese Academy of Forestry located in Pingxiang,Guangxi Province were studied.The results showed that the four soil microelements in the three plantations had no significant correlation with the soil layer,and no uniform distribution pattern along the soil depth.At the same soil layer,both of the total contents of 4 microelements and the available contents of Cu,Zn and Mn in the Eucalyptus plantation were higher than in the two native plantations,but the available content of Fe in Pinus massoniana plantation was higher than in the other two broadleaved species plantations.At the same stand,the available contents of Cu,Fe,Zn,Mn in the three plantations were in the order of topsoil >middle soil layer >subsoil.