广西马尾松人工林对重金属元素的吸收、累积及动态

探讨了广西马尾松人工林对重金属Cu、Zn、Mn、Pb、Ni、cd元素的吸收、累积及动态。结果表明:马尾松林地土壤层(0~60 cm)中重金属元素Cu、Zn、Mn、Pd、Ni、Cd的平均含量,分别为23.02,24.46,235.46,5.93.8.45和0.14 mg·kg-1,储量大小依次为Mn>Zn>Cu>Ni>Pb>Cd。马尾松林不同组分中,重金属元素的含量范围分别为Cu 2.97-13.47,Zn 12.09-42.93,Mn 143.14-751.78,Pd 2.87-25.12,Ni 0.19-25.05和Cd 0.16~1.24 mg·kg-1,对土壤6种重金属元素富集能力的大小依次为Cd>Mn>Pb>Zn>Ni>Cu。马尾松林中,重金属元素的总储量为39.791kg·hm-2,其中Mn、Zn、Pb、Cu、Cd、Ni元素的储量分别为34.047,3.351,1.226,0.874,0.245,0.084 kg·hm-2,各组分中重金属元素储量的空间分布为干>皮>根>叶>枝。Cu、Zn、Mn、Pd、Ni、Cd的周转期分别为13.9、7.0、3.1、20.4、2.1、12 a,流动系数为Ni>Mn>Zn>Cd>Cu>Pb。

Absorption,accumulation and dynamic of heavy metal elements in Pinus massoniana plantation in Guangxi

The absorption, accumulation and dynamic of heavy metal Cu, Zn, Mn, Pb, Ni, Cd elements were studied in Pinus massoniana plantation at Lufeng Forestry Farm in Guangxi Autonomous Region. The results indicated that in the soil (0-60 cm) of the forest,the average contents of heavy metal Cu,Zn,Mn,Pb,Ni,Cd elements were 23. 02,24. 46,235. 46,5. 93,8. 45 and 0. 14 mg· kg-1,respectively, the storage of them was in the order as Mn>Zn>Cu>Ni>Pb>Cd. In different parts of the plant the contents of the elements were:Cu 2. 97-13. 47,Zn 12. 09-42. 93,Mn 143. 14-751. 78,Pb 2.87-25. 12,Ni 0. 19-25.05 and Cd 0. 16-1.24 mg· kg-1. The concentration ability of Cu,Zn,Mn,Pb,Ni,Cd elements was in the rank as Cd>Mn>Pb>Zn >Ni>Cu. The existing accumulation of Mn,Zn,Pb,Cu,Cd,Ni elements in standing corps of the plantation were respectively 34. 047,3.351,1. 226,0. 874,0. 245,0. 084 kg ·hm-2 , the spatial distribution sequence of heavy metal elements pool amounts in different components ranked as trunk>bark>root>leaf>branch. The turnover period was Cu 13. 9,Zn 7. 0,Mn 3. 1 ,Pb 20. 4,Ni 2. l,Cd 12 (a). The flow coefficients were Ni>Mn >Zn>Cd>Cu>Pb.