不同桉树人工林Cu元素积累和循环的比较研究  

Comparative Study on Cu 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：《水土保持学报》2007年第5期59-63,共5页Journal of Soil and Water Conservation

基　　金：国家自然科学基金项目(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项目

摘　　要：通过对海南刚果12桉、尾叶桉、窿缘桉3种桉树Cu元素的积累、循环进行比较研究。结果表明,刚果12桉、尾叶桉、窿缘桉3种桉树Cu元素平均含量为4.61,3.45,4.36 m g/kg;林分积累量为0.350 3,0.397 6,0.1167kg/hm2。年存留量尾叶桉>刚果12桉>窿缘桉;年归还量刚果12桉>尾叶桉>窿缘桉;刚果12桉、尾叶桉年吸收量分别是窿缘桉的2.7,2.6倍;刚果12桉、窿缘桉、尾叶桉循环系数分别为0.66,0.63,0.53。两种林分特征下尾叶桉Cu元素的含量存在差异,林下有植被的林分和林下无植被的林分Cu元素含量分别为17.15,13.48 m g/kg,林分积累量为0.534 4,0.336 8 kg/hm2。林下有植被的林分和无林下植被的林分Cu元素年存留量分别为0.106 8,0.067 3 kg/(hm2.a);年归还量为0.247 4,0.160 0 kg/(hm2.a);年吸收量分别为0.354 2,0.227 3 kg/(hm2.a);循环系数分别为0.70和0.71。The Cu accumulation and cycle were studied in different Eucalyptus plantations and different understorey environments. The results showed that average contents of Cu in Eucalyptus ABL12,E. urophylla and E. exserta plantations were respectively 4.61,3.45 and 4.36 mg/kg ; The accumulation of Cu in these three stands were respectively 0. 350 3,0. 397 6 and 0. 116 7 kg/hm2, which in E. urophylla and E. ABL12 stands were respectively 3.4 and 3 times as much as that in E. exserta stand. The annual accumulation of Cu was in sequence of E. urophylla 〉 E. ABL12 〉 E. exserta, while annual restitution was in sequence of E. ABL12 〉 E. urophylla〉 E. exserta, annual absorption of Cu in E. ABL12 and E. urophylla were respectively 2.7 and 2. 6 times as much as that in E. exserta; The cycling velocity of Cu in E. ABL12, E. exserta and E. urophylla were respectively 0. 66, 0. 63 and 0.53. The contents of Cu differed in E. urophylla plantation with different standing characteristics, which were 17.15 mg/kg in stand with understorey vegetation while 13.48 mg/kg in stand without understorey vegetation,and accumulation of Cu in these two stands were respectively 0. 534 4 and 0. 067 3 kg/（hm^2·a）, the Cu accumulation in E. urophylla plantation with understorey vegetation was higher by 58.66% than that in plantation without understorey vegetation. The annual accumulation of Cu in these two stands was respectively 0. 106 8 and 0.067 3 kg/（hm^2·a）, annual restitution was 0. 247 4 and 0. 160 0 kg/（hm^2· a）, and annual absorption was 0. 3542 and 0.227 3 kg/（hm^2· a） ; The cycling quotiety was 0.70 and 0.71.

关 键 词：桉树人工林 Cu积累 生物循环 

分 类 号：S154.4[农业科学—土壤学]