编号：CDUT-2022-16

标题：A decreasing carbon allocation to belowground autotrophic respiration in global forest ecosystems

入藏号：WOS:000701970600002

中国科学院文献情报中心期刊分区：环境科学与生态学2区/TOP

本校作者：唐晓鹿，施月红，罗新蕊，刘亮，李景吉

来源出版物：SCIENCE OF THE TOTAL ENVIRONMENT 卷798 文献号149273

出版年：  2021

第一地址：成都理工大学

关键词：碳分配，地下自养呼吸，随机森林

代表图：

摘要：Belowground autotrophic respiration (RAsoil) depends on carbohydrates from photosynthesis flowing to roots and rhizospheres, and is one of the most important but least understood components in forest carbon cycling.Carbon allocation plays an important role in forest carbon cycling and reflects forest adaptation to changing en-vironmental conditions. However, carbon allocation to RAsoil has not been fully examined at the global scale. To fill this knowledge gap, we first used a Random Forest algorithm to predict the spatio-temporal patterns of RAsoil from 1981 to 2017 based on the most updated Global Soil Respiration Database (v5) with global environmental variables; calculated carbon allocation from photosynthesis to RAsoil (CAB) as a fraction of gross primary produc-tion; and assessed its temporal and spatial patterns in global forest ecosystems. Globally, mean RAsoil from forests as 8.9 ± 0.08 Pg C yr-1 (mean ± standard deviation) from 1981 to 2017 and increased significantly at a rate of 0.006 Pg C yr^-2, paralleling broader soil respiration changes and suggesting increasing carbon respired by roots. Mean CAB was 0.243 ± 0.016 and decreased over time. The temporal trend of CAB varied greatly in space, reflecting uneven responses of CAB to environmental changes. Combined with carbon use efficiency, our CAB

文章链接地址：https://www.sciencedirect.com/science/article/pii/S0048969721043461