| Contrasting grass nitrogen strategies reflect interspecific trade-offs between nitrogen acquisition and use in a semi-arid temperate grassland | |
| Xi, Nianxun; Zhu, Bi-Ru; Zhang, Da-Yong | |
| 2017 | |
| Source Publication | PLANT AND SOIL
 |
| Volume | 418Issue:43102Pages:267-276 |
| Abstract | Nitrogen (N) niche differentiations play an important role in community structure and biogeochemical cycling in terrestrial ecosystems. However, very few studies have examined how plant N strategies specialize via trade-offs between N acquisition and use abilities under natural field conditions. A field experiment was conducted to investigate N strategies by coexisting grass species using the in-situ stable isotope labeling technique. We injected N-15-labeled nitrate, N-15-labeled ammonium, and C-13-N-15-labeled glycine solutions in early and late vegetative growing seasons. Shoot delta N-15 and N concentration were measured to determine the N uptake and use abilities of 4 common species. All plant species preferred to take up nitrate (the dominant N form) over ammonium and glycine, and N-acquisition capacity varied with temporal variation of soil N. However, the dominant species was more N-conservative than less-dominant species and had lower overall N uptake rates (shoot N-15 excess 48 hours after injection) and higher N use efficiencies (aboveground biomass : N ratio). The different N strategies may reflect mixed effects of environmental filtering and interspecific competition and have significant implications for species coexistence as well as for ecosystem functions such as nutrient cycling. |
| Department | 其他 |
| Keyword | Niche Differentiation Nitrogen Form Plant Phenology Species Coexistence Stable Isotope |
| Language | 英语 |
| Document Type | 期刊论文 |
| Identifier | https://ir.xtbg.ac.cn/handle/353005/10743 |
| Collection | 其他 |
| Recommended Citation GB/T 7714 | Xi, Nianxun,Zhu, Bi-Ru,Zhang, Da-Yong. Contrasting grass nitrogen strategies reflect interspecific trade-offs between nitrogen acquisition and use in a semi-arid temperate grassland[J]. PLANT AND SOIL,2017,418(43102):267-276. |
| APA | Xi, Nianxun,Zhu, Bi-Ru,&Zhang, Da-Yong.(2017).Contrasting grass nitrogen strategies reflect interspecific trade-offs between nitrogen acquisition and use in a semi-arid temperate grassland.PLANT AND SOIL,418(43102),267-276. |
| MLA | Xi, Nianxun,et al."Contrasting grass nitrogen strategies reflect interspecific trade-offs between nitrogen acquisition and use in a semi-arid temperate grassland".PLANT AND SOIL 418.43102(2017):267-276. |
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