银合欢在大厂矿区锡锌尾砂库生长的野外试验研究

大厂矿区尾砂成分相当复杂，含有多种对植物生长有害的重金属元素，且缺乏植物生长所必须的营养物质，纯尾砂环境中植物的自然定居十分困难。在坑马尾砂库进行的植被恢复与重建试验表明，垃圾肥处理和覆土处理相比，垃圾肥增加了土壤养分，改善了土壤结构，银合欢长势明显好于覆土组和纯尾砂组；覆土的最大优势在于土壤本身携带有植物种子，有利于野生植物的繁殖与发育。试验结果表明：在用垃圾肥对尾砂进行改良之后，银合欢能在锡辞尾砂库上较好地生长，而在未经过任何改良的纯尾砂库上则明显受到抑制；银合欢不同组织中的As、Pb、zn含量均不高，仅略高于一般植物的背景值。

Field Experiment of Leucaena Leucocephala (Lamk) Dewit. Growth on the Sn - Zn Tailing Ponds in Dachang Mining Area

The components of the tailings in Dachang mine area are very complex,containing many kinds of phytotoxic heavy metals,lacking the nutrition needed by plants,so it is very hard for plants living in the pure tailing environment.Field experiment of plants growth in the Kengma tailings pond indicates that garbage fertilizer treatment can improve the edaphic structure and provide essential nutrition for the plant growth,while the thin soil covering treatment with plant seeds can facilitate the propagation and growth of wild plants species.The experimental result shows that after reclaiming the tailings with garbage fertilizer,Leucaena leucocephala(Lamk) Dewit.can grow well on the tin-zinc tailings pond while it is restricted in the tailings ponds without any reclamation;the contents of As,Pb and Zn in Leucaena leucocephala(Lamk) Dewit.are not high,only a little above those in normal plants.