Significance of organic nitrogen acquisition for dominant plant species in an alpine meadow on the Tibet plateau, China
文献类型：SCI/SSCI论文
| 作者 | Xu X. L. ; Ouyang H. ; Kuzyakov Y. ; Richter A. ; Wanek W. |
| 发表日期 | 2006 |
| 关键词 | organic N uptake C-14 N-15 alpine grassland N acquisition Spirulina microbial biomass nitrogen boreal forest plants amino-acid-uptake soil-nitrogen direct extraction grassland soils carbon roots transformations fumigation |
| 英文摘要 | Though the potential of plants to take up organic N (e.g., amino acids) is well established, the true significance of organic N acquisition to plant N nutrition has not yet been quantified under field conditions. Here we demonstrate that organic N contributes significantly to the annual N uptake of three dominant plant species (Kobresia humilis, Saussurea superba and Stipa aliena) of alpine meadows on the Tibet Plateau, China. This was achieved by using double-labelled (C-14 and N-15) algae as a source for slow and continuous release of amino acids, and tracing both labels in the above- and below-ground plant biomass. Four months after addition of algae, between 0.5% and 2.6% of C-14 and 5% and 14% of N-15 from added algae were recovered in the plants, which translate into an uptake of organic N between 0.3 mg N m(-2) and 1.5 mg N m(-2). The calculated contribution of organic N to total N uptake was estimated to range between 21% and 35% for K. humilis, and between 13% and 21% for S. aliena and S. superba, respectively, implying that organic N uptake by grassland plants is quantitatively significant under field conditions in the studied alpine meadows. This finding has important ecological implications with regard to competition for organic N between microorganisms and plant roots. |
| 出处 | Plant and Soil |
| 卷 | 285 |
| 期 | 1-2 |
| 页 | 221-231 |
| 收录类别 | SCI |
| 语种 | 英语 |
| ISSN号 | 0032-079X |
| 源URL | [http://ir.igsnrr.ac.cn/handle/311030/22653]  |
| 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 | Xu X. L.,Ouyang H.,Kuzyakov Y.,et al. Significance of organic nitrogen acquisition for dominant plant species in an alpine meadow on the Tibet plateau, China. 2006. |
入库方式： OAI收割
来源：地理科学与资源研究所
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