文献类型：期刊文献

英文题名：Carbon exchange characteristics and their environmental effects in the northern forest ecosystem of the Greater Khingan Mountains in China

作者：Zhang, Xin[1,2] Zhang, Qiuliang[1,2] Sun, Shoujia[3] Xu, Zhihong[4] Jian, Yanan[1] Yang, Yue[5] Tian, Yuan[6] Sa, Rula[1] Wang, Bing[1] Wang, Fei[1]

第一作者：Zhang, Xin

通信作者：Zhang, QL[1]

机构：[1]Inner Mongolia Agr Univ, Coll Forestry, Dept Forest Management, Hohhot 010019, Peoples R China;[2]Natl Field Sci Observat & Res Stn Greater Khingan, Genhe 022350, Inner Mengolia, Peoples R China;[3]Chinese Acad Forestry, Res Inst Forestry, Beijing 100091, Peoples R China;[4]Griffith Univ, Ctr Planetary Hlth & Food Secur, Sch Environm & Sci, Nathan, Qld 4111, Australia;[5]Lanzhou Univ, Sch Life Sci, Minist Educ, Key Lab Cell Act & Stress Adaptat, Lanzhou 730000, Peoples R China;[6]Huangshan Univ, Coll Life & Environm Sci, Huangshan 245041, Peoples R China

年份：2022

卷号：838

外文期刊名：SCIENCE OF THE TOTAL ENVIRONMENT

收录：;EI(收录号：20222212184625);Scopus(收录号：2-s2.0-85131071532);WOS:【SCI-EXPANDED(收录号:WOS:000806516100013)】；

基金：Funding information This project was supported by the Regional Program of National Natural Science Foundation of China (grant no. 32060262) and the Training Pro-gram of National Natural Science Foundation of China (grant no. 2021GJYY003) .

语种：英文

外文关键词：C exchange; CO 2 concentration; C isotope composition; C release; CO 2 lake phenomenon

摘要：global climate change, and it is particularly useful for understanding the processes and mechanisms of ecosystem C exchange. Through observation of CO2 concentration at different heights, this study examined whether a CO2 lake phenomenon exists in the Larix gmelinii ecosystem of the Greater Khingan Mountains (China), and how it might be changed and what might represent its driving factors if such a phenomenon were found to exist. Plants and soils were sampled regularly to determine delta 13C and to quantify the proportion of C released by each component of the ecosystem. The main path of C release and the main source of CO2 lake formation were investigated. Statistical analysis revealed that a CO2 lake phenomenon does exist in the L. gmelinii ecosystem. Comparative analysis showed that on the daily scale, when the ecosystem was a C source, the CO2 lake phenomenon often occurred. On the scale of the growing season, the strongest CO2 lake was accompanied by emergence of the peak respiratory flux. Stepwise regression analysis showed that environmental factors could explain 74.87% of the CO2 lake phenomenon. The occurrence and strength of the CO2 lakes were found to mainly respond to changes in temperature. Linear model analysis revealed that the rate of C release from autotrophic respiration in the forest was 51.18%; the rate of C release from heterotrophic respiration during litter decomposition was 51.78%. Therefore, the C release of the L. gmelinii ecosystem is mainly from autotrophic respiration. The CO2 released during decomposition of litter represented the main source for the formation