喀斯特城市森林微量元素生物循环的研究  

Study on trace elements biological cycle in urban forests of karst areas

作　　者：王仲[1] 田大伦[1,2] 宁晓波[1,3] 闫文德[1,2] 张胜利[1] 

机构地区：[1]中南林业科技大学,湖南长沙410004 [2]南方林业生态应用技术国家工程实验室,湖南长沙410004 [3]贵州省林业厅,贵州贵阳550001

出　　处：《中南林业科技大学学报》2013年第7期107-113,共7页Journal of Central South University of Forestry & Technology

基　　金：国家林业公益性行业科研专项(200904031);国家林业局项目(201042);湖南省科技厅项目(2010TP4011-3);湖南省教育厅项目(湘财教字[2010]70号)

摘　　要：采用现场实例和实验分析法,对喀斯特地区贵阳市10年生亮叶桦+意杨林、33年生麻栎林中Cu、Zn、Mn、Ni、Co、Pb、Cd、Fe元素的含量、积累和分布、生物循环进行了研究。结果表明:2种林分土壤pH值为4.49～5.03,为酸性土壤,微量元素含量Fe最高,Mn次之,Cd最低;林木中微量元素以Mn最高,为195.41～646.67 mg.kg-1;林木组织器官叶中含Cu量最高,为52.04～75.38 mg.kg-1;根中含Fe量最高,为24.22～70.09 mg.kg-1;林木对土壤中Cu的富集能力最强,富集系数为2.68～6.71;2种林分微量元素的生物循环积累量为18.22～589.60 kg.hm-2,存留量为1.822～17.870 kg.hm-2a-1,归还量为0.621～1.942 kg.hm-2a-1,吸收量为2.442～19.813 kg.hm-2a-1,利用系数为0.034～0.134,循环系数为0.098～0.254。By using field examples and experimental analysis methods,the concentration,accumulation,spatial distribution,decomposition and biological cycle of eight trace elements（Cu,Zn,Mn,Ni,Co,Pb,Cd,Fe） in 10-year-old Betula luminifera and Italian poplar mixed forest and 33-year-old Sawtooth oak forest were investigated.The results show that the pH of two stands soil was 4.49 ～ 5.03 and the soils were acidic,the concentration of Fe had the highest value among the eight trace elements,following by Mn,and Cd had the lowest concentration in the soils;the concentration of Mn was 195.41 ～ 646.67 mg.kg-1 in trees and Mn had the highest value,Cu had the highest concentration of 52.04 ～ 75.38 mg.kg-1 in leaves;Fe had the highest concentration of 24.22 ～ 70.09 mg.kg-1 in roots;Cu had the highest enrichment factor of 2.68 ～ 6.71;accumulation amounts of trace elements in two stands was 18.22 ～ 589.60 kg.hm-2,retention amount was 1.822 ～ 17.870 kg.hm-2 a-1,return amount was 0.621 ～ 1.942 kg.hm-2a-1,absorption amount was 2.442 ～ 19.813 kg.hm-2a-1,utilization coefficient was 0.034 ～ 0.134,cycling coefficient was 0.098 ～ 0.254.

关 键 词：喀斯特 城市森林 亮叶桦 意杨 麻栎 微量元素 生物循环 

分 类 号：S718.554.2[农业科学—林学]