Differential responses of grasses and forbs led to marked reduction in below-ground productivity in temperate steppe following chronic N deposition
文献类型：SCI/SSCI论文
| 作者 | Bai W. M.; Guo, D. L.; Tian, Q. Y.; Liu, N. N.; Cheng, W. X.; Li, L. H.; Zhang, W. H. |
| 发表日期 | 2015 |
| 关键词 | below-ground productivity grasses and forbs nitrogen deposition photosynthetic rates plant-soil (below-ground) interactions root traits soil acidification temperate steppe root life-span atmospheric nitrogen deposition species richness inner-mongolia global perspective buffering capacity regional trends soil chemistry grasslands ecosystem |
| 英文摘要 | Enhanced deposition of atmospheric nitrogen (N) has profound impacts on ecosystem processes such as above-ground productivity and community structure in grasslands across the globe. But how N deposition affects below-ground processes of grasslands is less well known. Here, we evaluated the effects of chronic N amendment at a relatively low rate (20kgha(-1)year(-1)) on root traits (root productivity, root biomass, root/shoot ratio) in Inner Mongolia steppes by rhizotron and ingrowth core and soil monolith techniques at levels of individual species, functional groups and ecosystem. For 8years, N amendment suppressed above-ground net primary production (ANPP), photosynthetic rates and root biomass of forbs, but enhanced ANPP and root biomass of grasses. This led to an overall reduction in below-ground productivity of the grassland by 24-33%, while ANPP remained unchanged. Nitrogen amendment acidified soil and subsequently increased extractable soil manganese (Mn) concentration. Nitrogen amendment increased foliar Mn concentrations in forb, but not grass species, leading to a significant inhibition of photosynthetic rates in forb species.Synthesis. These findings highlight the importance of the differentiating responses of plant functional groups to long-term N deposition and the important consequences of these responses for below-ground productivity and long-term soil C sequestration. |
| 出处 | Journal of Ecology |
| 卷 | 103 |
| 期 | 6 |
| 页 | 1570-1579 |
| 收录类别 | SCI |
| 语种 | 英语 |
| ISSN号 | 0022-0477 |
| 源URL | [http://ir.igsnrr.ac.cn/handle/311030/38547]  |
| 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 | Bai W. M.,Guo, D. L.,Tian, Q. Y.,et al. Differential responses of grasses and forbs led to marked reduction in below-ground productivity in temperate steppe following chronic N deposition. 2015. |
入库方式： OAI收割
来源：地理科学与资源研究所
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