文献类型：期刊文献

英文题名：Increase in temperature and precipitation reduces the sensitivity of δ13C dynamics to temperature in cold-temperate forest respiration products

作者：Zhang, Xin[1,2] Zhang, Qiuliang[1,3] Lu, Changwei[2,4,5] Sun, Shoujia[6] Sa, Rula[1] Wang, Bing[1] Wang, Fei[1] Jian, Yanan[1]

第一作者：Zhang, Xin

通信作者：Zhang, QL[1];Lü, C[2];Zhang, QL[3];Lü, C[4];Lü, C[5]

机构：[1]Inner Mongolia Agr Univ, Coll Forestry, Hohhot 010019, Peoples R China;[2]Inner Mongolia Univ, Coll Ecol & Environm, Hohhot 010021, Peoples R China;[3]Inner Mongolia Agr Univ, Natl Field Sci Observat & Res Stn Greater Khingan, Genhe 022350, Peoples R China;[4]Inner Mongolia Univ, Key Lab Ecol & Resource Use Mongolian Plateau, Minist Educ, Hohhot 010021, Peoples R China;[5]Inner Mongolia Univ, Inner Mongolia Key Lab Grassland Ecol, Hohhot 010021, Peoples R China;[6]Chinese Acad Forestry, Res Inst Forestry, Beijing 100091, Peoples R China

年份：2025

卷号：37

期号：1

外文期刊名：JOURNAL OF FORESTRY RESEARCH

收录：;WOS:【SCI-EXPANDED(收录号:WOS:001632579400001)】；

基金：This research work has been supported by the Inner Mongolia Science and Technology Plan project (grant no. 2023YFDZ0026) and the National Natural Science Foundation of China (grant No. 32260389, 32160286).

语种：英文

外文关键词：Ecosystem respiration; Autotrophic respiration; Heterotrophic respiration; Carbon isotopes; Temperature sensitivity; Larix gmelinii

摘要：Research on the sensitivity of carbon isotope composition (delta C-13) dynamics to temperature (Q(10)) and its influencing factors in the process of ecosystem respiration (Re) can accurately predict the trend for ecosystem carbon release with global warming for assessing ecosystem carbon sequestration capacity. We used stable isotope techniques to monitor canopy CO2 concentration and delta C-13 in a cold-temperate Larix gmelinii forest in Northeast China. delta C-13 values were also analyzed in plant and soil samples across five stand types. The sensitivity of delta C-13 dynamics to temperature during Re and the main factors affecting the variation in Q(10) values were determined. Carbon isotope composition of ecosystem respiration (delta C-13(Re)), autotrophic respiration (delta C-13(Ra)), and heterotrophic respiration (delta C-13(Rh)) decreased with increase in temperature, and delta C-13(Ra) < delta C-13(Re) < delta C-13(Rh). The contribution of Ra and Rh to Re were 51.57 and 48.42%, respectively. Temperature and precipitation had inhibitory effects on Q(10), whereas soil organic carbon and total nitrogen had stimulatory effects. Autotrophic respiration is the dominant pathway for carbon release in this ecosystem. Heterotrophic respiration, and particularly maintenance respiration, are more temperature-sensitive. Rising temperatures and precipitation reduce the delta C-13 sensitivity to temperature.