湘潭锰矿废弃地栾树人工林微量元素生物循环  

Biological cycling of Koelreuteria paniculata plantation microelements in Xiangtan Manganese Mine wasteland

作　　者：罗赵慧[1,2] 田大伦[1,2] 田红灯[1,2] 徐露燕[1,2] 李雄华[1,2] 

机构地区：[1]中南林业科技大学,长沙410004 [2]南方林业生态应用技术国家工程实验室,长沙410004

出　　处：《生态学报》2013年第20期6517-6525,共9页Acta Ecologica Sinica

基　　金：国家林业公益性行业科研专项(201104009);湖南省教育厅项目(湘财教字[2010]70号);长沙市科技局创新平台项目(K1003009-61)

摘　　要：对湘潭锰矿废弃地5年生栾树人工林中8种微量元素的含量、积累、空间分布和生物循环进行了研究。结果表明:林地土壤中,各微量元素含量顺序为:Fe>Mn>Zn>Pb>Ni>Cu>Co>Cd,且Fe、Mn、Co、Cd含量随土层深度的增加而增加。枯枝落叶层中,仅Mn和Co从半分解到已分解阶段向土壤中转移,其他元素在分解过程中都出现了不同程度的富集。栾树各器官微量元素含量顺序为:叶>枝>细根>皮>粗根>大根>根头>干,各微量元素总含量顺序为:Mn>Fe>Zn>Pb>Cu>Cd>Ni>Co。林分微量元素总贮量为15.272kg/hm2,其中干和枝贮存量最高,占总贮存量的54.204%,各器官微量元素贮存量顺序为:枝>干>叶>皮>根头>大根>粗根>细根;林分微量元素吸收量为5.255kg·hm-2·a-1,存留量为2.504kg·hm-2·a-1,归还量2.751kg·hm-2·a-1,总利用系数为2.394,循环系数为3.138,周转期为11.203a。栾树对土壤中Mn的吸收和富集能力强,维持生长所需量较多,循环强度较大和周转期较短,而且林分对养分的稳定性和自我调节能力强有利于林地生产力维持。因此,栾树可作为锰矿区废弃地植被修复的优选树种。Plants have been used to mitigate pollutant concentrations in contaminated soils. In order to understand and evaluate the possibility of Koelreuteria paniculata species in Phytoremediation, a study was conducted in an abandon manganese mine wasteland in Xiangtan to examine the characteristics of concentration, accumulation, spatial distribution and biological cycling of 8 microelements （Fc, Mn, Cu, Zn, Pb, Co, Ni, Cd） in a 5-year old Koelreuteria paniculata plantation,. The results showed that the concentration of 8 microelements in the plantation soils was in an order Fe〉Mn〉Zn 〉Pb〉Ni〉Cu〉Co〉Cd, and the concentration of Fe, Mn, Co and Cd were increased with soil depth. On the litterfall layer, the concentrations of all microelements were enriched except the elements of Mn and Co. The concentration of Mn and Co was decreased in both semi-decomposed and complete-decomposed litterfall parts. The concentration of microelements in different organs of Koelreuteria paniculata species was ranked as： Leaves〉Branch〉Fine root〉Bark〉coarse root〉Large root〉 Stump〉Stem and the concentration of 8 microelements were in the order of Mn〉Fe〉Zn〉Pb〉Cu〉Cd〉Ni〉Co. The total storage of 8 microelements in the plantation was 15.27kg/hm2, the storage of the microelements was the highest in branch and stem, which accounted for 54.2% of the total storage of the microelements. The storage of microelements in organs was ranked as： Branch〉Stem〉Leave〉 Bark〉Stump〉Large root〉Coarse root〉Fine root. The annual absorption,annual retentionand annual return amount of mieroelements were 5.26kg.hm-2.a-1, 2.50kg.hm-2. a -1, and 2.75kg. hm-2. a-1 in the studied plantation, respectively. The utilization coefficient, cycling coefficient and recycling period were 2.39, 3.14 and 11.20a, respectively. Our study indicated that Koelreuteria paniculata plantation had a high ability to absorb and enrich Mn, The plantations had high requirements of Mn for maintaining growth, a high intensity of cycle, and

关 键 词：湘潭 锰矿废弃地 栾树人工林 微量元素 生物循环 

分 类 号：S718.5[农业科学—林学]