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通过野外模拟实验,研究3个氮沉降水平,CK(对照,0kg·hm-2·a-1)、LN(低氮,30kg·hm-2·a-1)和HN(高氮,100kg·hm-2·a-1)处理对亚热带针叶(杉木)和阔叶(罗浮栲、浙江桂)森林土壤中微量元素Ni、Cu、Zn含量的影响。结果表明:就不同的林分来看,3种微量元素的含量大致呈杉木林>罗浮栲林>浙江桂林,施氮3d后,浙江桂林和罗浮栲林土壤中3种微量元素在各处理之间差异不显著,仅发现杉木林土壤中的Ni含量在CK处理与LN及HN处理之间和无凋落物土壤中Cu含量在HN与CK及LN之间的差异显著;3片林分中土壤表面有无凋落物处理总体对3种微量元素含量的影响不大。与施氮前相比,3片林分土壤中的Ni、Cu、Zn含量均有所下降,且浙江桂林在LN处理的降幅最大。
Three field experiments were conducted to study the effects of nitrogen deposition on CK (CK, 0 kg · hm -2 · a -1), LN (low nitrogen, 30 kg · hm -2 · a -1) and HN (high nitrogen 100 kg · hm-2 · a-1) on the contents of trace elements Ni, Cu and Zn in forest soils of subtropical conifer (Cunninghamia lanceolata) and broadleaf (Loisel The results showed that the content of three kinds of trace elements in the different stands was generally Cunninghamia lanceolata> Luofuanguang> Guilin, Zhejiang. After three days of application of nitrogen, three trace elements in the soil of Guilin and There was no significant difference between the two treatments. It was only found that the content of Ni in Cunninghamia lanceolata soil was significantly different between CK and LN and HN, and Cu in HN and CK and LN without litter. There is little effect on the content of three kinds of trace elements on the surface with or without litter treatment. Compared with pre-nitrogen application, the content of Ni, Cu and Zn in the three stands decreased, and the decline of LN in Guilin of Zhejiang Province was the largest.