摘要:
应用BCR连续提取法，以大兴安岭漠河县胭脂沟典型采金迹地4种自然植被群落类型为研究对象，研究了不同植被群落类型对土壤锰元素4种化学形态的影响。结果表明：大穗薹草玉蝉花群落、兴安柳白桦群落、兴安落叶松群落和樟子松群落土壤弱酸可提取态锰平均含量占该群落总量的比例分别为36.25%、36.63%、31.04%和43.39%；可还原态锰平均含量占总量的比例分别为30.71%、32.98%、36.80%和27.28%；可氧化态锰平均含量占总量的比例分别为9.07%、7.10%、8.30%和7.13%；残渣态锰平均含量占总量的比例分别为23.97%、23.28%、23.86%和22.20%。通过因子分析表明：大穗薹草玉蝉花群落对锰难分解形态固持效果好，且对土壤弱酸可提取态锰含量积累较高；兴安柳白桦群落对锰难分解形态固持效果差，且对土壤弱酸可提取态锰含量消耗较大；樟子松群落对土壤弱酸可提取态锰含量积累程度最高，且有利于锰难分解形态向着对植物有效的形态转化；兴安落叶松群落对土壤弱酸可提取态锰含量消耗最大，且对锰难分解形态活化程度低。此研究结果可为采金迹地人工恢复植被过程中筛选植物提供参考。
Abstract:
Four vegetation types of typical goldmining wasteland were selected as the study subjects in Rouge Ditch of Mohe County in Daxingan Mountain, northeastern China. By applying BCR sequential extraction method, the effects of different vegetations on four chemical speciations of soil Mn were studied. The results showed that average contents of soil EXMn in Carex rhynchophysaIris ensata community(CR),Salix hsinganicaBetula platyphylla community(SH), Larix gmelinii community(LG), and Pinus sylvestris community(PS) were about 36.25%, 36.63%, 31.04% and 43.39% of the total content; average contents of REDMn took up 30.71%, 32.98%, 36.80% and 27.28% of the total; average contents of OXIMn took up 9.07%, 7.10%, 8.30% and 7.13% of the total; while average contents of RESMn accounted for 23.97%, 23.28%, 23.86% and 22;20% of the total. According to factoranalysis, CR was effective in immobilizing recalcitrant Mn and accumulated high quantity of EXMn; SH preserved few recalcitrant Mn and consumed large amount of EXMn; PS accumulated the largest amount of EXMn and proned to activize the recalcitrant Mn; LG consumed the largest share of EXMn and maintained a weak ability in activizing recalcitrant Mn. These results would provide reference for plant selection in vegetationrestoration process of goldmining wasteland.
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