Nitrogen enrichment delays the drought threshold responses of leaf photosynthesis in alpine grassland plants
文献类型：期刊论文
| Author | He, Yicheng1,2; Zhang, Ruiyang1; Li, Pengyu1,3; Men, Lu1,4; Xu, Meng1; Wang, Jinsong1; Niu, Shuli1,5; Tian, Dashuan1,5 |
| Source | SCIENCE OF THE TOTAL ENVIRONMENT
 |
| Issued Date | 2024-02-25 |
| Volume | 913Pages:8 |
| Keyword | Drought threshold Leaf photosynthesis Nitrogen addition Extreme drought Functional trait |
| ISSN | 0048-9697 |
| DOI | 10.1016/j.scitotenv.2023.169560 |
| Corresponding Author | Tian, Dashuan(tiands@igsnrr.ac.cn) |
| English Abstract | 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 Keyword | SOIL-WATER AVAILABILITY ; STOMATAL CONDUCTANCE ; RUBISCO ACTIVITY ; CLIMATE-CHANGE ; CO2 ; RESPIRATION ; MESOPHYLL ; IMPACTS ; STRESS ; GROWTH |
| Funding Project | 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 Research Area | Environmental Sciences & Ecology |
| Language | 英语 |
| WOS ID | WOS:001154349300001 |
| Publisher | ELSEVIER |
| Funding Organization | 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]  |
| Collection | 中国科学院地理科学与资源研究所 |
| Corresponding Author | Tian, Dashuan |
| Affiliation | 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 |
| Recommended Citation 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
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