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| DOI | 10.1002/ecs2.4761 |
| Growing-season climate as an explanation of spatial variations in temperature sensitivity of green-up on Tibetan Plateau | |
| 发表日期 | 2024 |
| ISSN | 2150-8925 |
| 起始页码 | 15 |
| 结束页码 | 2 |
| 卷号 | 15期号:2 |
| 英文摘要 | Temperature sensitivity (TS) of the green-up date (GUD) of plants is crucial for the prediction of grassland phenology that is important for animal husbandry and pasture management. Spatial variations in the TS are known to reflect interannual temperature variability and/or accumulated precipitation preceding the GUD (pre-GUD). However, whether spatial TS variations are related to the interaction between pre-GUD temperature variability and precipitation, which is a potential indicator of frost risk, remains unclear. Furthermore, because the interaction between interannual temperature variability and accumulated precipitation following the GUD (post-GUD) can exert selection pressure on the plant life cycle, it may also be involved in shaping the spatial TS pattern. Using long-term ground observations of GUD on the Tibetan Plateau, we show that TS is more negative (greater GUD advance per unit temperature increase) in areas with more pre-GUD precipitation and low pre-GUD interannual temperature variability, but less negative in areas with more pre-GUD precipitation and high pre-GUD interannual temperature variability. This result is likely because more pre-GUD precipitation facilitates sprout and leaf development under stable temperature conditions, whereas it increases frost risk when the temperature variability is high. In contrast, TS magnitude decreases with increases in post-GUD precipitation in areas where post-GUD interannual temperature variability is low, but increases with post-GUD precipitation in areas where post-GUD interannual temperature variability is high. We speculate that because hydrothermal demands for leaf growth from the onset of green-up to maturity are more easily fulfilled when interannual temperature variability is lower and precipitation is higher, green-up need not be sensitive to pre-GUD temperature. In contrast, high post-GUD precipitation likely aggravates low-temperature constraints on leaf growth when temperature variability is high, resulting in greater TS to maximize growing season length. These results suggest that spatial TS variations on the Tibetan Plateau are likely associated with adaptations of leaf-out phenology to background pre-GUD climatic conditions together with selection pressure from post-GUD conditions. |
| 英文关键词 | alpine ecosystem; climate change; dryland; spring phenology; temperature sensitivity; temperature variability |
| 语种 | 英语 |
| WOS研究方向 | Environmental Sciences & Ecology |
| WOS类目 | Ecology |
| WOS记录号 | WOS:001154577600001 |
| 来源期刊 | ECOSPHERE
 |
| 来源机构 | 中国科学院青藏高原研究所 |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/305004 |
| 作者单位 | Chinese Academy of Sciences; Institute of Tibetan Plateau Research, CAS; Beijing Normal University; Beijing Normal University; Peking University; University of Antwerp |
| 推荐引用方式 GB/T 7714 | . Growing-season climate as an explanation of spatial variations in temperature sensitivity of green-up on Tibetan Plateau[J]. 中国科学院青藏高原研究所,2024,15(2). |
| APA | (2024).Growing-season climate as an explanation of spatial variations in temperature sensitivity of green-up on Tibetan Plateau.ECOSPHERE,15(2). |
| MLA | "Growing-season climate as an explanation of spatial variations in temperature sensitivity of green-up on Tibetan Plateau".ECOSPHERE 15.2(2024). |
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