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OALib Journal期刊
ISSN: 2333-9721
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哈尔滨市4种阔叶树树干重金属含量动态变化及富集特征
DOI: 10.3969/j.issn.1000-2006.2013.06.013, PP. 64-68
Keywords: 树木年轮,重金属,富集系数,土壤树木体系,城市森林
Abstract:
以哈尔滨东北林业大学城市林业示范研究基地黄菠萝、蒙古栎、水曲柳和白桦为研究对象,分析不同阔叶树树干cu、zn、pb、hg、as、cd元素的径向含量动态,探讨4树种重金属富集特征。结果表明,除了白桦中pb、黄菠萝和水曲柳中hg、白桦中as径向变化分别为单峰曲线和随年代推移略降低外,其他树种重金属含量均在2000―2007年间最高(除了蒙古栎hg为次高)。黄菠萝树干cu、hg,白桦树干cd、zn、pb和as(其中蒙古栎中as含量与其相等)平均含量分别是其余树种树干的1.4～3.3,1.3～2.4倍。土壤树木体系中hg最易迁移,其次为cd(除了水曲柳),cu、pb、zn因树种而异,as迁移程度最低。不同树种对同一重金属富集程度不同,蒙古栎和黄菠萝对hg、蒙古栎和白桦对cd污染较为严重的土壤富集系数最高,且数值相当。因此,修复hg、cd污染土壤的首选树种是蒙古栎。
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