Changes in peak greenness timing and senescence duration codetermine the responses of leaf senescence date to drought over Mongolian grassland
文献类型：期刊论文
| 作者 | Bai, Wenrui1,2; Wang, Huanjiong1; Dai, Junhu1,2,3; Ge, Quansheng1 |
| 刊名 | AGRICULTURAL AND FOREST METEOROLOGY
 |
| 出版日期 | 2024-02-15 |
| 卷号 | 345页码:109869 |
| 关键词 | Drought Leaf senescence date Peak greenness timing Senescence rate Gross primary productivity Climate extreme |
| DOI | 10.1016/j.agrformet.2023.109869 |
| 产权排序 | 1 |
| 英文摘要 | Leaf senescence is a key trait for vegetation in temperate regions to overcome winter temperatures, and extreme drought events have profoundly affected its timing. The effects of drought on autumn phenology have been investigated by correlating leaf senescence date (LSD) to multiple drought indices. However, leaf senescence is a dynamic process starting from peak greenness timing (PGT) and lasting several months (senescence duration, SD). How PGT and SD changes affected the LSD's response to drought is still poorly understood. Here, we investigated LSD's response to drought in the Mongolian grassland based on PGT and SD. We first extracted the LSD, PGT, and SD from the MODIS Enhanced Vegetation Index (EVI) during 2001-2020 and determined the late-season drought events (LDE) using the Standardized Precipitation Evapotranspiration Index. Subsequently, we quantified the response of LSD to LDE as the difference between drought and normal years (Delta LSD), and then quantified the contributions of changes in PGT and SD on Delta LSD. We also analyzed the effects of drought on late-season productivity. The results showed that LSD may advance or delay under LDE, but the earlier LSD (in 68.4 % of areas) was mainly distributed in warmer and drier regions. Earlier LSD under drought was more controlled by earlier PGT, while later LSD under drought was more controlled by extended SD. Changes in late-season pro-ductivity under LDE were more correlated with changes in annual maximum EVI (EVImax) than Delta LSD. These results enhanced our understanding of how LSD of temperate grassland responds to drought events and emphasized the importance of investigating the response of autumn phenology to drought from a process-based perspective. |
| WOS关键词 | CLIMATE-CHANGE ; AUTUMN PHENOLOGY ; VEGETATION DYNAMICS ; SPRING PHENOLOGY ; PLANT PHENOLOGY ; CHINA ; PRODUCTIVITY ; VARIABILITY ; PHYSIOLOGY ; PLATEAU |
| WOS研究方向 | Agriculture ; Forestry ; Meteorology & Atmospheric Sciences |
| WOS记录号 | WOS:001146000100001 |
| 源URL | [http://ir.igsnrr.ac.cn/handle/311030/201690]  |
| 专题 | 陆地表层格局与模拟院重点实验室_外文论文 |
| 作者单位 | 1.Chinese Acad Sci, Inst Geog Sci, Key Lab Land Surface Pattern & Simulat, 11A Datun Rd, Beijing 100101, Peoples R China 2.Chinese Acad Sci, Nat Resources Res, 11A,Datun Rd, Beijing 100101, Peoples R China 3.Univ Chinese Acad Sci, 19A Yuquan Rd, Beijing 100049, Peoples R China 4.Chinese Acad Sci, China Pakistan Joint Res Ctr Earth Sci, Higher Educ Commiss Pakistan, Islamabad 45320, Pakistan |
| 推荐引用方式 GB/T 7714 | Bai, Wenrui,Wang, Huanjiong,Dai, Junhu,et al. Changes in peak greenness timing and senescence duration codetermine the responses of leaf senescence date to drought over Mongolian grassland[J]. AGRICULTURAL AND FOREST METEOROLOGY,2024,345:109869. |
| APA | Bai, Wenrui,Wang, Huanjiong,Dai, Junhu,&Ge, Quansheng.(2024).Changes in peak greenness timing and senescence duration codetermine the responses of leaf senescence date to drought over Mongolian grassland.AGRICULTURAL AND FOREST METEOROLOGY,345,109869. |
| MLA | Bai, Wenrui,et al."Changes in peak greenness timing and senescence duration codetermine the responses of leaf senescence date to drought over Mongolian grassland".AGRICULTURAL AND FOREST METEOROLOGY 345(2024):109869. |
入库方式： OAI收割
来源：地理科学与资源研究所
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