Nitrogen enrichment delays the drought threshold responses of leaf photosynthesis in alpine grassland plants
文献类型：期刊论文
| 作者 | He, Yicheng1,2; Zhang, Ruiyang1; Li, Pengyu1,3; Men, Lu1,4; Xu, Meng1; Wang, Jinsong1; Niu, Shuli1,5; Tian, Dashuan1,5 |
| 刊名 | SCIENCE OF THE TOTAL ENVIRONMENT
 |
| 出版日期 | 2024-02-25 |
| 卷号 | 913页码:8 |
| ISSN号 | 0048-9697 |
| 关键词 | Drought threshold Leaf photosynthesis Nitrogen addition Extreme drought Functional trait |
| DOI | 10.1016/j.scitotenv.2023.169560 |
| 通讯作者 | Tian, Dashuan(tiands@igsnrr.ac.cn) |
| 英文摘要 | Extreme drought is found to cause a threshold response in photosynthesis in ecosystem level. However, the mechanisms behind this phenomenon are not well understood, highlighting the importance of revealing the drought thresholds for multiple leaf-level photosynthetic processes. Thus, we conducted a long-term experiment involving precipitation reduction and nitrogen (N) addition. Moreover, an extreme drought event occurred within the experimental period. We found the presence of drought thresholds for multiple leaf-level photosynthetic processes, with the leaf light-saturated carbon assimilation rate (Asat) displaying the highest threshold (10.76 v/v%) and the maximum rate of carboxylation by Rubisco (Vcmax) showing the lowest threshold (5.38 v/v%). Beyond the drought thresholds, the sensitivities of leaf-level photosynthetic processes to soil water content could be greater. Moreover, N addition lowered the drought thresholds of Asat and stomatal conductance (gs), but had no effect on that of Vcmax. Among species, plants with higher leaf K concentration traits had a lower drought threshold of Asat. Overall, this study highlights that leaf photosynthesis may be suppressed abruptly as soil water content surpasses the drought threshold. However, N enrichment helps to improve the resistance via delaying drought threshold response. These new findings have important implications for understanding the nonlinearity of ecosystem productivity response and early warning management in the scenario of combined extreme drought events and continuous N deposition. |
| WOS关键词 | SOIL-WATER AVAILABILITY ; STOMATAL CONDUCTANCE ; RUBISCO ACTIVITY ; CLIMATE-CHANGE ; CO2 ; RESPIRATION ; MESOPHYLL ; IMPACTS ; STRESS ; GROWTH |
| 资助项目 | Natural Science Foundation of China[32271636] ; Natural Science Foundation of China[32101309] ; National Key Research and Development Program of China[2022YFF0802102] ; National Key Research and Development Program of China[2020RC003] ; Youth Innovation Promotion Association[2021050] |
| WOS研究方向 | Environmental Sciences & Ecology |
| 语种 | 英语 |
| 出版者 | ELSEVIER |
| WOS记录号 | WOS:001154349300001 |
| 资助机构 | Natural Science Foundation of China ; National Key Research and Development Program of China ; Youth Innovation Promotion Association |
| 源URL | [http://ir.igsnrr.ac.cn/handle/311030/202531]  |
| 专题 | 中国科学院地理科学与资源研究所 |
| 通讯作者 | Tian, Dashuan |
| 作者单位 | 1.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Key Lab Ecosyst Network Observat & Modeling, Beijing 100101, Peoples R China 2.China Agr Univ, Coll Grassland Sci & Technol, Beijing 100193, Peoples R China 3.Beijing Forestry Univ, Sch Grassland Sci, Beijing 100083, Peoples R China 4.Southwest Minzu Univ, Inst Qinghai Tibetan Plateau, Chengdu 610041, Peoples R China 5.Univ Chinese Acad Sci, Coll Resources & Environm, Beijing 100049, Peoples R China |
| 推荐引用方式 GB/T 7714 | He, Yicheng,Zhang, Ruiyang,Li, Pengyu,et al. Nitrogen enrichment delays the drought threshold responses of leaf photosynthesis in alpine grassland plants[J]. SCIENCE OF THE TOTAL ENVIRONMENT,2024,913:8. |
| APA | He, Yicheng.,Zhang, Ruiyang.,Li, Pengyu.,Men, Lu.,Xu, Meng.,...&Tian, Dashuan.(2024).Nitrogen enrichment delays the drought threshold responses of leaf photosynthesis in alpine grassland plants.SCIENCE OF THE TOTAL ENVIRONMENT,913,8. |
| MLA | He, Yicheng,et al."Nitrogen enrichment delays the drought threshold responses of leaf photosynthesis in alpine grassland plants".SCIENCE OF THE TOTAL ENVIRONMENT 913(2024):8. |
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。