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首页> 外文期刊>Biology and Fertility of Soils >Variations in nitrogen, zinc, and sugar concentrations in Chinese fir seedlings grown on shrubland and plowed soils in response to arbuscular mycorrhizae-mediated process
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Variations in nitrogen, zinc, and sugar concentrations in Chinese fir seedlings grown on shrubland and plowed soils in response to arbuscular mycorrhizae-mediated process

机译：丛枝菌根介导过程在灌木丛和耕作土壤上生长的杉木幼苗中氮，锌和糖浓度的变化

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摘要

One-year-old seedlings of Chinese fir (Cunninghamia lanceolata (Lamb.) Hook) are not colonized with ectomycorrhizal (EM) fungi, but often colonized with arbuscular mycorrhizal (AM) fungi. The AM fungi could be important for nutrient acquisition in Chinese fir seedlings. Previous studies show that feedbacks between aboveground and belowground plant tissues play a fundamental role in controlling the interaction between plants and AM fungi. Our results indicate significant feedback in seedlings grown on shrubland soils, but not on plowed soils. The amounts of sugar in fir leaves in the shrubland soils were significantly lower than those in plowed soils. Leaf zinc (Zn) and nitrogen (N) concentrations were significantly higher in seedlings in shrubland soils than in plowed soils. In mycorrhizal seedlings growing in shrubland soils, leaf N:P ratios were significantly higher than those in plowed soils, likely because of enhanced N absorption through AM-mediated process. Leaf N:P ratios in seedlings grown on plowed soils were below the threshold levels, because of low metabolic activity of feedback in AM-mediated process. The results suggested that the presence of feedback between Chinese fir seedlings and AM fungi should be benefit in transplanting Chinese fir seedlings.
机译：一岁的杉木幼苗（杉木（Cunninghamia lanceolata（Lamb。）Hook））没有被外生菌根（EM）真菌定植，而是经常被丛枝菌根（AM）真菌定植。 AM真菌对于杉木幼苗的养分获取很重要。先前的研究表明，地上和地下植物组织之间的反馈在控制植物与AM真菌之间的相互作用中起着基本作用。我们的结果表明，在灌木丛土壤上生长的幼苗中有明显的反馈，但在耕地土壤上却没有。灌木丛土壤中杉木叶中的糖含量显着低于耕地土壤中的糖含量。灌木丛土壤中幼苗的叶片锌（Zn）和氮（N）浓度显着高于耕地。在灌木丛土壤中生长的菌根幼苗中，叶片的N：P比明显高于犁过的土壤，这可能是由于通过AM介导的过程吸收了更多的氮。由于在AM介导的过程中反馈的代谢活性较低，因此在翻耕过的土壤上生长的幼苗的叶片N：P比率低于阈值水平。结果表明，杉木苗与AM真菌之间存在反馈，对于杉木苗的移栽应具有一定的借鉴意义。

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