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Isotopic evaluation of the role of arbuscular mycorrhizae in the nitrogen preference in Chinese fir seedlings
He-Chun Piao; Cong-Qiang Liu; Shi-Jie Wang
2012
发表期刊Pedobiologia
卷号55期号:3页码:167-174
摘要

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 delta N-15 or foliar delta N-15(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 delta N-15 and foliar delta N-15 (fol-soil) were significantly higher than those in ploughed soils, likely because of enhanced high delta N-15/NO3- absorption through AM-mediated pathways. Those results showed that foliar delta N-15 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 NH4+-N rather than NO3--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 NO3--N compared to NH4+-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-NH4+, 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.

关键词Arbuscular Mycorrhiza Nitrate Ammonium 15n Natural Abundance Chinese Fir Seedling Soil Environment
学科领域环境地球化学
收录类别SCI
语种英语
文献类型期刊论文
条目标识符http://ir.gyig.ac.cn/handle/352002/4830
专题环境地球化学国家重点实验室_环境地球化学国家重点实验室_期刊论文
推荐引用方式
GB/T 7714
He-Chun Piao,Cong-Qiang Liu,Shi-Jie Wang. Isotopic evaluation of the role of arbuscular mycorrhizae in the nitrogen preference in Chinese fir seedlings[J]. Pedobiologia,2012,55(3):167-174.
APA He-Chun Piao,Cong-Qiang Liu,&Shi-Jie Wang.(2012).Isotopic evaluation of the role of arbuscular mycorrhizae in the nitrogen preference in Chinese fir seedlings.Pedobiologia,55(3),167-174.
MLA He-Chun Piao,et al."Isotopic evaluation of the role of arbuscular mycorrhizae in the nitrogen preference in Chinese fir seedlings".Pedobiologia 55.3(2012):167-174.
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