文献类型：期刊文献

英文题名：Alternating Dominant Effects of Temperature and Precipitation on Vegetation Activity Along Elevation Gradients in the Alpine and Sub-Alpine Woodland of Southwest China

作者：Sun, Meirong[1] Sun, Pengsen[1] Liu, Ning[2] Zhang, Lei[3] Yu, Zhen[4] Feng, Qiuhong[5] Smettem, Keith[6] Liu, Shirong[1]

第一作者：Sun, Meirong

机构：[1] Ecology and Nature Conservation Institute, Chinese Academy of Forestry, Beijing, China; [2] CSIRO, Canberra, ACT, 2601, Australia; [3] Research Institute of Forestry, Chinese Academy of Forestry, Beijing, China; [4] Institute of Ecology, School of Applied Meteorology, Nanjing University of Information Science & Technology, Nanjing, China; [5] Ecological Restoration and Conservation on Forest and Wetland Key Laboratory of Sichuan Province, Sichuan Academy of Forestry, Sichuan, Chengdu, 610081, China; [6] The UWA Institute of Agriculture, The University of Western Australia, Perth, WA, 6001, Australia

年份：2023

外文期刊名：SSRN

收录：EI(收录号：20230328458)

语种：英文

外文关键词：Additives - Climate change - Forestry - Vegetation

摘要：Elevation exerts a pivotal role in modulating hydroclimatic dynamics, exerting a dominant influence on vegetation activity, and sculpting vegetation distribution patterns within alpine regions. Nevertheless, a conspicuous knowledge gap persists regarding the alternating dominant effects of environmental drivers on vegetation activity along elevation gradients (EG). In this study, we investigated the spatiotemporal patterns of the Normalized Difference Vegetation Index (NDVI), employed as a proxy for vegetation activity, and scrutinized its interactions with temperature (T) and precipitation (P) along EG in the Alpine and Sub-alpine Woodlands of Southwest China (ASWSC) during the 2001-2018 period. Our findings illuminated that approximately 24% of ASWSC's vegetation exhibited a significant greening trend, in response to regional warming and a slight increase in precipitation during the study duration. Below 4200m in elevation, we observed an increase in the ratios of areas exhibiting significant greening and browning in comparison to the total land area, whereas above 4200m, these ratios decreased. Interestingly, both of these change rates decreased as we considered the entire EG. Regarding the alternating dominant effects between T and P along EG, an antagonistic effect was predominant, except for an additive effect observed between elevations of 2300-4200m. This suggested that, overall, alpine and sub-alpine ecosystems were highly sensitive to climate change, while the section between 2300-4200m appeared to be the most resilient to climate change. The antagonistic effect tended to be more pronounced in warm and dry years, while the additive effect was more prominent in cold and wet years. Specifically, the positive influence of P increased in warm and dry conditions at elevations below 4200m, while the positive influence of T was more significant in cold and wet conditions at elevations above 4200m. Deciduous broadleaved forest (DBF) and mixed forest (MF), which exhibited a significant additive effect of T-P along EG. On the other hand, shrubland and grassland types showed a strong antagonistic effect of T-P along EG. In summary, our study revealed a range of diverse and alternating dominant effects of temperature and precipitation on vegetation activity along the elevation gradients EG. These findings deepen our understanding of vegetation responses to climate change and contribute to establishing a scientific foundation for effective ecosystem management and conservation practices. ? 2023, The Authors. All rights reserved.