连续年龄序列桉树人工林土壤微量元素含量及其影响因素  

The spatial distribution and influencing factors of soil trace elements of eucalyptus plantation in continuous age sequences

作　　者：袁颖红[1] 樊后保[1] 黄荣珍[1] 苏兵强 刘文飞[1] 

机构地区：[1]南昌工程学院生态与环境科学研究所,江西南昌330099 [2]福建省国有林场管理局,福建福州350003

出　　处：《生态环境学报》2009年第1期268-273,共6页Ecology and Environmental Sciences

基　　金：江西省自然科学基金项目(0630101);福建省林业厅科技项目(闽林科[2007]6号)

摘　　要：对连续年龄序列(2a、3a、4a、5a、6a)桉树人工林土壤三种微量元素(Fe、Mn、Zn)的含量及其影响因素进行了分析,探讨了土壤微量元素含量随林分年龄的变化规律。土壤养分之间的相关性分析表明,所有年龄阶段的桉树人工林中土壤Fe、Mn、Zn含量与土壤pH值之间呈极显著的正相关,说明土壤微量元素含量强烈受土壤酸度的影响。土壤三种微量元素含量与土壤全K、全Ca、全Mg等大量养分元素含量之间均存在显著或极显著的正相关,而与土壤有机C、全N、全P的相关性不明显(0～20cm表层土壤的Zn除外)。总的来说,土壤微量元素含量随桉树人工林年龄的增加呈下降趋势,其中6a生桉树人工林各土壤层(0～20cm、20～40cm、40～60cm)的Fe、Mn、Zn含量分别比2a生林分下降13.7%～21.8%、55.6%～57.2%和71.0%～73.2%。在当前桉树人工林种植方式下,随着林分年龄的增加,应增施有机、无机肥和Fe、Mn、Zn等微量元素肥料,以有效控制土壤地力衰退和实现桉树人工林可持续经营。Due to fast growth of eucalyptus, eucalyptus is widely planted in tropical and south subtropical regions in China. Contents of Soil trace elements （Fe, Mn, Zn） and its influenceing factors of eucalyptus plantation in continuous age sequences （2 a, 3 a, 4 a, 5 a, 6 a） were studied, and change rules of which were discussed with increasing ages. Correlative analyses among soil nutrients showed that contents of soil Fe, Mn and Zn of eucalyptus plantation in all age classes were significantly positive correlation with pH, which indicated that soil acidity affect intensively content of soil trace elements. Contents of soil Fe, Mn and Zn of eucalyptus plantation were significantly or most significantly positive correlation with total K, total Ca, total Mg, but which were not obviously correlation with soil organic C, total N, total P （except for zinc of 0～20 cm）. To sum up, the content of soil trace elements exhibited significantly decreasing tread with increasing ages of eucalyptus plantation, Contents of soil Fe, Mn and Zn for six years in different horizons （0～20 cm, 20～40 cm, 40～60 cm） were decreased by 13.7%～21.8%、55.6%%～57.2%, 71.0%～73.2% respectively than which for two years. Therefore, it is necessary to increase applied amount of chemical and organic fertilizer, and fertilizer which contain trace elements in order to control the decaying trend for soil fertility in this region and ensure sustainable and stable development of eucalyptus plantations.

关 键 词：年龄序列 桉树人工林 土壤微量元素 影响因素 

分 类 号：S153.6[农业科学—土壤学]