摘要
为将来应用闽楠进行大规模造林或杉木人工纯林改造提供科学依据,对湖南永州金洞林场10年生闽楠人工林生态系统7种微量元素(Cu、Fe、Zn、Mn、Ni、Cd、Pb)的积累与分布进行了研究.结果表明:闽楠人工林乔木层各器官微量元素含量均以Mn元素含量最高,Ni、Pb元素含量最低.各元素含量(mg?kg-1)在乔木层的均值表现为Mn(291.35)>Fe(92.64)>Zn(13.94)>Cu(7.15)>Cd(2.00)>Pb(1.07)>Ni(0.77);除Mn、Cd外,林下植被的微量元素含量明显高于乔木层,枯落物的7种微量元素含量在植被层各组分中均为最大.在土壤层(0~60 cm)的微量元素含量(mg?kg-1)均值表现为:Fe(2565.34)>Mn(109.84)>Ni(72.65)>Zn(30.79)>Pb(11.88)>Cu(8.23)>Cd(0.78).Cu、Fe、Zn、Ni元素含量随土层加深而增加;Mn、Cd、Pb随土壤各层次变化规律不明显.7种微量元素在植被层的储量均表现为乔木层>枯落物层>林下植被层.闽楠人工林生态系统总元素储量为20811.09 kg?hm-2,各元素储量(kg?hm-2)排序为:Fe(19053.91)>Mn(832.31)>Ni(539.495)>Zn(229.45)>Pb(88.372)>Cu(61.63)>Cd(5.923).土壤层总微量元素储量占生态系统储量的99.88%.
Abstract
To provide scientific basis for the future application of Phoebe bournei for large-scale afforestation or adjustment of pure Chinese fir plantation,the content,storage and distribution of 7 microelements(Cu, Fe, Zn, Mn, Ni, Cd, Pb) in the 10-year-old P. bournei plantation ecosystem were examined in Jindong Forest Farm, Yongzhou, Hunan Provence. The results showed that the microelement content (mg?kg-1) of plantation was varied in different organs,Mn was the highest,and Ni and Pb was the lowest at arbor layer,in a order of following:Mn(291.35)>Fe(92.64)>Zn(13.94)>Cu(7.15)>Cd(2.00)>Pb(1.07)>Ni(0.77). Eexcluding Mn and Cd,the content of microelement in undergrowth vegetation was significantly higher than that at tree layer. The content of 7 microelements in the humus layer were the highest among the components in the vegetation layer.The microelement content(mg?kg-1) was in the following order:Fe(2 565.34)>Mn(109.84)>Ni(72.65)>Zn(30.79)>Pb(11.88)>Cu(8.23)>Cd(0.78)at 0-60 cm soil layer. The content of Cu, Fe, Zn, Ni increased, while Mn, Cd and Pb didn′t obviously change, with the soil depth. The accumulation of 7 microelement at vegetation layer suggested tree layer>humus layer>understory vegetation layer. The total microele-ment storage (kg?hm-2) of P. bournei plantation ecosystem was 20 811.09 and the order was Fe(19 053.91)>Mn(832.31)>Ni(539.495)>Zn(229.45)>Pb(88.372)>Cu(61.63)>Cd(5.923), soil microelement storage account for more than 99.88% of total forest ecosystem.
国家科技期刊平台
NSTL
维普
万方数据