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OALib Journal期刊
ISSN: 2333-9721
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马尾松酸性根际环境中铝的化学行为――以重庆酸雨区马尾松林地土壤为例
DOI: 10.3724/SP.J.1145.2010.00523, PP. 523-528
Keywords: 化学行为,铝和铝形态,酸性林地,土壤？根系界面,马尾松
Abstract:
以重庆酸雨区马尾松林地土壤为例，通过马尾松幼苗盆栽试验法研究了酸性土壤？马尾松根系界面铝（al）的化学行为.林地土壤中的铝可分级为交换态铝（alex）、有机态铝（alor）、氧化态铝（alox）、碳酸盐态铝（alc）和不溶态铝（alin）.研究结果表明：共存盐基离子ca2+、mg2+、k+和na+对al3+在土壤？马尾松根系界面行为的影响呈正效应（缓解铝毒），影响顺序为ca2+>mg2+>k+≈na+.全氮和全磷含量与根系铝含量呈正相关；土壤有机质（organicmatter，om）含量与根际alor浓度呈正相关.土壤ph值（<5.0）与根际alex呈负相关，根际alex大于非根际alex，马尾松根系铝的吸收主要取决于根际土壤alex含量，alex进入根系后逐步与根细胞壁小分子有机化合物配位，主要以alor累积于根部.图1表5参20
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