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首页> 外文期刊>Water, Air, and Soil Pollution >THE EFFECTS OF AlCl_3 ADDITIONS ON RHIZOSPHERE SOIL AND FINE ROOT CHEMISTRY OF SUGAR MAPLE (ACER SACCHARUM)
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THE EFFECTS OF AlCl_3 ADDITIONS ON RHIZOSPHERE SOIL AND FINE ROOT CHEMISTRY OF SUGAR MAPLE (ACER SACCHARUM)

机译：AlCl_3的添加对糖浆（蔗糖）根际土壤和细根化学的影响

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Increased Al mobilization and Ca and Mg leaching have been linked to nutritional imbalances in sugar maple across the northeastern US and Canada. The susceptibility of sugar maple fine roots to Al stress is poorly understood, in part because roots respond to Al stress by altering the chemistry of the rhizosphere. AlCl_3 was applied to plots of sugar maple at the Hubbard Brook Experimental Forest, NH. After two years of treatment, we sampled fine roots of sugar maple, rhizosphere soil, and bulk soil in the Oa horizon and the upper 10 cm of the mineral soil. AlCl_3 treatments resulted in significantly less Ca (21%) and Mg (30%) in fine roots from the organic horizon, but had no significant effect on fine root Al. Fine root (Ca+Mg):Al ratios were 42% lower in AlCl_3 plots than in controls, though most roots had ratios above critical toxicity thresholds developed for hydroponically grown sugar maple seedlings. In the mineral horizon, roots differed only in Mg concentration, which was 22% lower in AlCl_3 plots. In the AlCl_3 treated plots, rhizosphere soil in the organic horizon had 47% greater Al and 29% less Mg than in controls. Combining data from both treatments we found significantly less Al and organically bound Al in rhizosphere soil than in bulk soil, possibly due to leaching of Al from the rhizosphere by organic acids released by roots. These results suggest that increased mobilization of Al in soil lowers (Ca+Mg):Al ratios in sugar maple fine roots, though roots may minimize Al stress by leaching Al from the rhizosphere.
机译：在美国东北部和加拿大，增加的铝动员以及钙和镁的浸出与糖枫的营养失衡有关。糖枫细根对Al胁迫的敏感性了解甚少，部分原因是根系通过改变根际化学反应对Al胁迫作出反应。将AlCl_3应用于新罕布什尔州布鲁克实验森林的糖枫地块。经过两年的处理，我们在Oa地平线和矿质土壤的上部10 cm取样了糖枫的细根，根际土壤和块状土壤。 AlCl_3处理从有机层中产生的细根中Ca（21％）和Mg（30％）显着减少，但对细根Al没有明显影响。在AlCl_3样地中，细根（Ca + Mg）：Al的比率比对照低42％，尽管大多数根的比率都高于为水培种植的枫树幼苗制定的临界毒性阈值。在矿物层中，根仅在Mg浓度上有所不同，在AlCl_3样地中，其浓度降低了22％。在经过AlCl_3处理的样地中，有机层中的根际土壤比对照中的铝含量高47％，镁含量低29％。结合两种处理的数据，我们发现根际土壤中的Al和有机结合的Al明显少于块状土壤，这可能是由于根部释放的有机酸从根际浸出了Al。这些结果表明，土壤中铝的增加迁移降低了糖枫细根中的（Ca + Mg）：Al比，尽管根可以通过从根际中浸出Al来最小化Al胁迫。

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