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重庆缙云山四川大头茶常绿阔叶林重金属元素的累积与生物循环 预览 被引量:6

Accumulation and biological cycle of heavy metal elements in Gordonia acuminata evergreen broad leaved forest of mountain Jinyun in Chongqing.
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摘要 研究了重庆缙云山四川大头茶常绿阔叶林对Cu、Zn、Mn、Pb、Cd元素的吸收、累积、分布及生物循环。结果表明,该林地表层土壤5种元素的储量关系为Mn>Zn>Pb>Cu>Cd;植物体不同部位各元素含量有着明显的差异,含量范围分别为Cu1.55~5.24、Zn3.96~37.96、Mn94.76~896.90、Pb1.51~16.00和Cd0.08~0.69μg/g;植物对土壤富集系数大小依次为Mn>Zn>Pb>Cd>Cu;群落现存生物量中,Cu、Zn、Mn、Pb、Cd元素的现存累积量分别为27.18、49.83、1687.26、35.67和1.18mg/m2;群落Cu、Zn、Mn、Pb、Cd的生物循环特征为:年吸收量分别为2.77、9.44、182.31、4.66和0.19mg/m2;年归还量分别为1.16、5.26、83.81、2.39和0.11mg/m2;年存留量分别为1.61、4.18、98.50、2.27和0.09mg/m2;周转期分别为23、9、20、15和11年。 Absorption, accumulation, distribution and biological cycle of Cu, Zn, Mn, Pb and Cd elements in Gordonia acuminata evergreen broad-leaved forest of Jinyun Mountain in Chongqing were studied. The results show that amounts of these five elements stored in the surface soil of the forest land are Mn>Zn>Pb>Cu>Cd; their contents in different plant parts are quite different,being Cu 1.55~5.24, Zn 3.96~37.96, Mn 94.76~896.90, Pb 1.51~16.00 and Cd 0.08~0.69μg/g; their accumulation ratios in plants to those in soil are Mn>Zn>Pb>Cd>Cu; the existing accumulating of Cu, Zn, Mn, Pb and Cd in the biomass of the community are 27.18, 49.83, 1687.26, 35.67 and 1.18mg/m 2 respectively.The biological cycle of the elements in the community are described as follows: Annual uptake of Cu is 2.77, Zn 9.44, Mn 182.31, Pb 4.66 and Cd 0.19 mg/m~2. Annual return of Cu is 1.16, Zn 5.26, Mn 83.81, Pb 2.39 and Cd 0.11 mg/m~2; Annual retention of Cu is 1.61, Zn 4.18, Mn 98.50, Pb 2.27 and Cd 0.09 mg/m~2. The turnover periods of Cu, Zn, Mn, Pb and Cd are 23, 9, 20, 5 and 11 years respectively.
作者 孙凡 钟章成 Sun Fan(College of Basic Science and Technology, Southwest Agricultural University, Chongqing 400716);Zhong Zhangcheng(Research Institute of Subtropical Bio geography, Southwest Normal University,Chongqing 400715)
出处 《中国环境科学》 EI CAS CSSCI CSCD 北大核心 1998年第2期 111-116,共6页 China Environmental Science
基金 国家自然科学基金
关键词 四川大头茶 常绿阔叶林 重金属 土壤污染 茶树 Gordonia acuminata evergreen broad leaved forest heavy metals cycle purification
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