网站地图 | 联系我们 | 管理系统 | 登录邮箱 | 内网办公 | English | 中国科学院    
首页 所况介绍 机构设置 科研成果 研究队伍 合作交流 研究生教育 党群园地 科学传播
 
 
 当前位置:首页 >>> 论文库

Nitrogen deposition magnifies the sensitivity of desert steppe plant communities to large changes in precipitation

作 者:Ma QH, Liu XD, Li YB, Li L, Yu HY, Qi M, Zhou GS*, Xu ZZ*
影响因子: 5.687
刊物名称: Journal of Ecology
出版年份: 2019
卷:   期:    页码: DOI:10.1111/1365-2745.13264

文章摘要 : 

1.Precipitation alteration and nitrogen (N) deposition caused by anthropogenic activities could profoundly affect the structure and functioning of plant communities in arid ecosystems. However, the plant community impacts conferred by large temporal changes in precipitation, especially with a concurrent increase in N deposition, remain unclear.

2. To address this uncertainty, from 2016–2017, an in situ field experiment was conducted to examine the effects of five precipitation levels, two N levels and their interaction on the plant community function and composition in a desert steppe in northern China.

3. Aboveground net primary production (ANPP) and plant communityweighted mean (CWM) height significantly increased with increasing precipitation, and both were well fitted with a positive linear model, but with a higher slope under N addition. The ANPP increase was primarily driven by the increase in Artemisia capillaris, a companion forb sensitive to precipitation variation. The plant community composition shifted with precipitation enhancement—from a community dominated by Stipa tianschanica, a perennial grass, to a community dominated by Artemisia capillaris.

4. Synthesis The findings imply that the ecosystem sensitivity to future changes in precipitation variability will be mediated by two potential mechanisms: concurrent N deposition and plant communitylevel change. It is suggested that we should consider the vegetation compositional shift and multiple resource colimitation in assessing the sensitivity of terrestrial ecosystems to climate change.


| 本站导航 | 园区风光| 联系我们 |
版权所有:中国科学院植物研究所 地址:北京市海淀区香山南辛村20号 邮编:100093 电话:010-62590835
网站备案号:京ICP备05002828号       文保网安备案号:1101080078