铝胁迫下杉木幼苗体内几种矿质元素含量变化及其相关性

Changes and Correlations of Minerals in Seedlings of Chinese Fir Under Aluminum Stress

为探明铝对杉木幼苗矿质元素含量的影响规律,采用土壤盆栽试验,研究不同铝处理下杉木幼苗根和叶片中矿质元素含量的变化。设置5个铝处理质量分数,分别为0(对照)、50、100、150和200mg·kg-1。结果显示:随着铝胁迫质量分数的增大,杉木根部B、Mo、K、Fe和Mn的含量表现出先升高后降低的变化趋势,表明低质量分数的铝促进杉木对以上元素的吸收,超过一定质量分数后则起阻碍作用。叶片B含量与根部变化趋势类似,为先升高后降低的变化趋势,叶片Mo含量只有在铝处理质量分数较高时才有所增加,叶片K、Fe和Mn含量则均随着铝质量分数的增加而增加,也表现出促进作用。相关分析表明,在杉木根部中,B与Mo、Fe含量之间呈显著正相关,Mo与Fe含量之间存在极显著正相关;在杉木叶片中,B与Mn含量之间呈显著正相关,Fe与Mo、Mn含量之间也呈显著正相关,K与其他4种元素含量之间则呈显著或极显著正相关。

To determine the effects of aluminum stress on the mineral contents in the seedlings of Chinese fir, a pot experiment was conducted. Changes in the mineral contents of the roots and leaves of the seedlings induced by varying the aluminum in soil were monitored and analyzed statistically for possible correlations among them. The aluminum contents in the soil were adjusted to be 0, 50, 100, 150, and 200 mg· kg -1. The results showed that the contents of B, Mo, K, Fe, and Mn in the roots increased initially and decreased subsequently with increasing aluminum. It indicated that absorption of the elements by the plants was promoted at low level, but inhibited by excess aluminum presented in the soil. The content of B in the leaves showed a similar trend as well. In the leaves, the content of Mo increased slightly only at high level of aluminum, while K, Fe and Mn increased with the increasing aluminum. The statistical analysis showed that B had a significant correlation with both Mo and Fe in the roots, while that between Mo and Fe was highly significant. In the leaves, B significantly correlated with Mn, while Fe with both Mo and Mn. Moreover, there was a significant or highly significant correlation between K and other 4 minerals.