The rhizosphere and hyphosphere differ in their impacts on carbon and nitrogen cycling in forests exposed to elevated CO2
文献类型：SCI/SSCI论文
| 作者 | Meier I. C.; Pritchard, S. G.; Brzostek, E. R.; Mccormack, M. L.; Phillips, R. P. |
| 发表日期 | 2015 |
| 关键词 | Duke free-air carbon enrichment(FACE) experiment exudation hyphosphere land carbon sink progressive nutrient limitation rhizosphere priming effects loblolly-pine forest extracellular enzyme-activity warm-temperate forest atmospheric co2 n fertilization mycorrhizal fungi organic-matter root exudation soil carbon microbial community |
| 英文摘要 | While multiple experiments have demonstrated that trees exposed to elevated CO2 can stimulate microbes to release nutrients from soil organic matter, the importance of root- versus mycorrhizal-induced changes in soil processes are presently unknown. We analyzed the contribution of roots and mycorrhizal activities to carbon (C) and nitrogen (N) turnover in a loblolly pine (Pinus taeda) forest exposed to elevated CO2 by measuring extracellular enzyme activities at soil microsites accessed via root windows. Specifically, we quantified enzyme activity from soil adjacent to root tips (rhizosphere), soil adjacent to hyphal tips (hyphosphere), and bulk soil. During the peak growing season, CO2 enrichment induced a greater increase of N-releasing enzymes in the rhizosphere (215% increase) than in the hyphosphere (36% increase), but a greater increase of recalcitrant C-degrading enzymes in the hyphosphere (118%) than in the rhizosphere (19%). Nitrogen fertilization influenced the magnitude of CO2 effects on enzyme activities in the rhizosphere only. At the ecosystem scale, the rhizosphere accounted for c. 50% and 40% of the total activity of N- and C-releasing enzymes, respectively. Collectively, our results suggest that root exudates may contribute more to accelerated N cycling under elevated CO2 at this site, while mycorrhizal fungi may contribute more to soil C degradation. |
| 出处 | New Phytologist |
| 卷 | 205 |
| 期 | 3 |
| 页 | 1164-1174 |
| 收录类别 | SCI |
| 语种 | 英语 |
| ISSN号 | 0028-646X |
| 源URL | [http://ir.igsnrr.ac.cn/handle/311030/38784]  |
| 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 | Meier I. C.,Pritchard, S. G.,Brzostek, E. R.,et al. The rhizosphere and hyphosphere differ in their impacts on carbon and nitrogen cycling in forests exposed to elevated CO2. 2015. |
入库方式： OAI收割
来源：地理科学与资源研究所
浏览0
下载0
收藏0
其他版本
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。