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首页> 外文期刊>Pedobiologia >Isotopic evaluation of the role of arbuscular mycorrhizae in the nitrogen preference in Chinese fir seedlings
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Isotopic evaluation of the role of arbuscular mycorrhizae in the nitrogen preference in Chinese fir seedlings

机译：杉木菌根中丛枝菌根在氮素偏好中的作用的同位素评估

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Chinese fir seedlings grow well in shrubland (including deciduous forest) soils without or less fertilizer application, but they sometimes harbor disease and show symptoms of nitrogen deficiency in ploughed (including several rotation of Chinese fir plantation) soils, where agricultural practice and clear-felling reduce the abundance and diversity of mycorrhizal fungi, and lead to destruction of mycorrhizae. Based on measurements of foliar δ ~(15)N or foliar δ ~(15)N fol-soil in seedlings collected from 33 nurseries, we compared the effect of an AM-mediated process on nitrogen resource use between shrubland and ploughed soils. In mycorrhizal seedlings growing in shrubland soils, both foliar δ ~(15)N and foliar δ ~(15)N (fol-soil) were significantly higher than those in ploughed soils, likely because of enhanced high δ ~(15)N/NO _3 ~- absorption through AM-mediated pathways. Those results showed that foliar δ ~(15)N typically reflected the isotopic signature of the source pools of N. We suggest that the dominant N form taken up by fir seedlings growing in ploughed soils was NH _4 ~+-N rather than NO _3 ~--N, where colonized root epidermis play an important role in exploiting soil N resource. However, the N form taken up by fir seedling growing in shrubland soils was primarily NO _3 ~--N compared to NH _4 ~+-N, which is attributed to the high efficiency in an AM-mediated process rather than the dominance of N species in the different habitats. It is conceivable that combined colonized root epidermis with AM-mediated process may be more important than root epidermis alone in exploiting different forms of N in nursery soils. Therefore, in low N and acidic ecosystems, species other than the dominant N-NH _4 ~+, should be considered to satisfy the N demand for Chinese fir survival and growth, while the efficiency of an AM-mediated process should be determined by soil abiotic conditions.
机译：杉木苗在灌木丛（包括落叶林）土壤中生长良好，而无需施用或少施肥，但有时会病害并在耕作（包括杉木人工林轮作）土壤上表现出氮缺乏的症状，在该土壤中进行农业实践和砍伐减少菌根真菌的丰度和多样性，并导致菌根的破坏。基于对33个苗圃中幼苗叶片δ〜（15）N或δ〜（15）N叶片土壤的测量，我们比较了AM介导的过程对灌丛和耕地土壤氮素利用的影响。在灌木丛土壤中生长的菌根幼苗中，叶面δ〜（15）N和叶面δ〜（15）N（fol-soil）均显着高于耕地土壤，可能是由于较高的δ〜（15）N /通过AM介导的途径吸收NO _3〜-。这些结果表明，叶面δ〜（15）N通常反映了氮源库的同位素特征。我们认为，耕地土壤中生长的杉木幼苗吸收的主要N形态为NH _4〜+ -N而不是NO _3 〜--N，其中定植的根表皮在开发土壤N资源方面起着重要作用。但是，灌木丛土壤中生长的杉木幼苗吸收的氮形态主要是NO _3〜--N，而NH _4〜+ -N则主要归因于AM介导的过程中的高效率而不是N的优势。物种在不同的栖息地。可以想象，在育苗土壤中利用不同形式的氮，将定殖的根表皮与AM介导的过程相结合可能比单独的根表皮更重要。因此，在低氮和酸性生态系统中，应考虑除占主导地位的N-NH _4〜+以外的其他物种来满足杉木生存和生长的氮需求，而AM介导过程的效率应由土壤决定。非生物条件。

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