不同桉树人工林锌元素的积累与循环比较  

A Comparative Study on Zn Accumulation and Cycle in Different Eucalyptus Plantations

作　　者：李东海[1] 杨小波[1] 吴庆书[1] 

机构地区：[1]海南大学生命科学与农学院,海口570228

出　　处：《中国农学通报》2007年第7期552-557,共6页Chinese Agricultural Science Bulletin

基　　金：国家自然科学基金项目"海南岛桉树林土壤种子库与林地可持续利用关系研究"(30160070);教育部热带海洋与陆生生物资源研究及利用重点实验室资助

摘　　要：为了桉树的可持续经营,对刚果12桉、尾叶桉、窿缘桉三种桉树Zn元素的积累、循环进行比较研究。采用野外样地取样和室内分析方法进行研究,研究结果表明:刚果12桉、尾叶桉、窿缘桉三种桉树Zn元素含量平均值为:28.42、13.64、18.03 mg/kg;林分Zn元素积累量为:2.7365、1.4110、0.6139 kg/hm2。年存留量为刚果12桉>尾叶桉>窿缘桉;年归还量为刚果12桉>窿缘桉>尾叶桉;刚果12桉、尾叶桉、窿缘桉循环系数分别为0.66、0.69、0.84。尾叶桉林下有植被的林分和林下无植被的林分Zn元素的含量分别为54.37、54.73 mg/kg;林分Zn元素积累量为:1.6806、1.1732 kg/hm2;Zn元素年存留量分别为0.3360、0.2346 kg/hm2.a;年归还量分别为0.6777、0.6072 kg/hm2.a;年吸收量分别为1.2483、0.8418 kg/hm2.a;循环系数分别为0.86和0.90。研究结果表明桉树凋落物的回归,促进林下植被的生长发育,对桉树人工林Zn元素的动态平衡起着重要的作用。To achieve the sustainable managements of Eucalyptus, comparison on the accumulation and cycle of Zn was made among Eucalyptus.ABL12, E.urophyUa and E.exserta with field sampling and data analysis methods. Results show that average contents of Zn in Eucalyptus.ABL12, E.urophyUa and E.exserta plantations are 28.42 mg/kg,13.64 mg/kg and 18.03 mg/kg respectively, and accumulations of Zn in the three forests are 2.7365 kg/hm^2,1.4110 kg/hm^2 and 0.6139 kg/hm^2 respectively. Annhal retention of Zn is in sequence of E.ABL12〉E.urophyUa〉E.exserta, and annual restitution is in sequence of E.ABL12〉E.exserta〉 E.urophylla. The cycling coefficient of Zn in E. ABL12, E. urophylla and E. exserta was 0.66, 0.69 and 0.84 respectively. There are some differences between Eucalyptus urophyUa forest with understory vegetation and the one without understory vegetation,for examples, contents, accumulation, annual retention, annual restitution, annual absorption and recycling coefficient of Zn are 54.37 mg/kg, 1.6806 kg/hm^2·a, 0.3360 kg/hm^2·a, 0.6777 kg/hm^2·a,l.2483 kg/hm^2·a and 0.86 in the former respectively, while 54.73 mg/kg, 1.1732kg/hm^2·a, 0.2346 kg/hm^2·a, 0.6072 kg/hm^2·a, 0.8418 kg/hm^2·a and 0.90 in the latter respectively. Conclusions can be made that litters makes a difference in development of understory vegetation and maintaining the dynamic balance of Zn in Eucalyptus forest.

关 键 词：桉树人工林 ZN 积累 生物循环 

分 类 号：S158.3[农业科学—土壤学]