Inorganic and organic nitrogen uptake by nine dominant subtropical tree species
文献类型：SCI/SSCI论文
| 作者 | Li C. C.; Li, Q. R.; Qiao, N.; Xu, X. L.; Li, Q. K.; Wang, H. M. |
| 发表日期 | 2016 |
| 关键词 | Plant Functional Group AM Fungi ECM Fungi N Uptake Subtropical Tree Species Succession arbuscular mycorrhizal fungi soil microbes terrestrial ecosystems n uptake plants roots china availability preferences acquisition |
| 英文摘要 | We explored inorganic and organic N uptake patterns by dominant tree species in a subtropical plantation of southern China to improve understanding of nitrogen (N) cycling in these forests. We labeled intact roots by brief N-15 exposures in field hydroponic experiments. Nine dominant tree species were examined to compare the effects of functional plant group (conifers versus broadleaves), mycorrhizal types, and forest successional stages on N uptake. All investigated species took up glycine at lower rates than other N forms, with mean values of 2.55 +/- 0.36 mu g N g(-1) d.w. root h(-1). Nitrate uptake rates for all species (average 5.81 +/- 0.35 mu g N g(-1) d.w. root h(-1)) were significantly lower than ammonium (36.86 +/- 5.17 mu g N g(-1) d. w. root h(-1)). All investigated species absorbed ammonium for more than 80% of total N uptake. Nitrate acquisition by these species was about 14% of total N uptake, with only 6% for glycine. Conifers showed significantly higher uptake rates of glycine, but lower uptake of nitrate than broadleaves. Arbuscular mycorrhizal (AM) and ectomycorrhizal (ECM) tree species showed significant difference in nitrate uptake, with higher rates by AM tree species. Tree species at late-successional forest stages showed higher uptake rates of nitrate than those in earlier successional stages. Our findings indicate that ammonium is the dominant N source and glycine is a minor N source throughout forest succession. |
| 出处 | Iforest-Biogeosciences and Forestry |
| 卷 | 9 |
| 页 | 253-258 |
| 语种 | 英语 |
| ISSN号 | 1971-7458 |
| DOI标识 | 10.3832/ifor1502-008 |
| 源URL | [http://ir.igsnrr.ac.cn/handle/311030/43049]  |
| 专题 | 地理科学与资源研究所_历年回溯文献 |
| 推荐引用方式 GB/T 7714 | Li C. C.,Li, Q. R.,Qiao, N.,et al. Inorganic and organic nitrogen uptake by nine dominant subtropical tree species. 2016. |
入库方式： OAI收割
来源：地理科学与资源研究所
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