酸铝处理对不同耐铝性桉树无性系吸收Al及N、P、K的影响

摘要

Soil culture method was conducted to appraise the effect of acid aluminum treatment on the absorption of Al, N, P and K in Eucalyptus clones (Eucalyptus grandis × E.urophylla Guanglin No.9, E. grandis × E. urophylla No. 12, E. urophylla No.4, E. urophylla × E. camaldulensis No. 3 ) with different aluminum tolerance. It was found that the root was the main organ to accumulate Al in Eucalyptus clones and had the largest increase after acid-Al treatments. The Al-tolerant clones ( Eucalyptus grandis× E. urophylla Guanglin No. 9) increased by 43.0 % while the weak Al-tolerant ones (E.urophylla Guanglin No.4) increased by 95.6 % on average. At the same time the content of N rose up intensively in the root of Guanglin No. 9, which could be the special mechanism in Al-tolerance genotypes. There was no direct proportion between the content of P with aluminum tolerance for its irregular response to Al. But the absorption of K was promoted, which indicated that K played an important role in the Al-tolerant mechanism of Eucalyptus.%采用土培法研究了酸性铝处理条件对4个不同耐铝性速生桉无性系(巨尾桉9号、巨尾按12号、韦赤桉3号、尾叶桉4号)吸收Al、N、P、K的影响.结果表明,按树对铝元素的累积均主要在根部,且在Al处理后根部Al含量增加幅度最大,耐铝无性系巨尾按9号平均增幅为43.0％,耐铝性最差的尾叶桉4号平均增幅达95.6％;巨尾桉9号根部的N含量大幅度提高,是耐铝型基因型的一种特殊耐铝机制;面对P的吸收则因不同无性系和不同部位存在着促进或抑制作用,与耐铝性的大小不成正比关系;铝胁迫均促进了不同耐铝型按树无性系对K的吸收,K可能是桉树植体内普遍存在的铝适应机制.