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] Lü, Changwei[2,4] Sun, Shoujia[5] Sa, Rula[1] Wang, Bing[1] Wang, Fei[1] Jian, Yanan[1]

第一作者：Zhang, Xin

机构：[1] College of Forestry, Inner Mongolia Agricultural University, Hohhot, 010019, China; [2] College of Ecology and Environment, Inner Mongolia University, Hohhot, 010021, China; [3] National Field Scientific Observation and Research Station of Greater Khingan Forest Ecosystem, Inner Mongolia Agricultural University, Genhe, 022350, China; [4] Ministry of Education Key Laboratory of Ecology and Resource Use of the Mongolian Plateau & Inner Mongolia Key Laboratory of Grassland Ecology, Inner Mongolia University, Hohhot, 010021, China; [5] Research Institute of Forestry, Chinese Academy of Forestry, Beijing, 100091, China

年份：2026

卷号：37

期号：1

外文期刊名：Journal of Forestry Research

收录：EI(收录号：20255019679154);Scopus(收录号：2-s2.0-105024066012)

语种：英文

外文关键词：Carbon - Carbon capture - Carbon sequestration - Dynamics - Ecosystems - Forestry - Global warming - Isotopes - Plants (botany) - Sensitivity analysis

摘要：Research on the sensitivity of carbon isotope composition (δ13C) dynamics to temperature (Q10) 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 δ13C in a cold-temperate Larix gmelinii forest in Northeast China. δ13C values were also analyzed in plant and soil samples across five stand types. The sensitivity of δ13C dynamics to temperature during Re and the main factors affecting the variation in Q10 values were determined. Carbon isotope composition of ecosystem respiration (δ13CRe), autotrophic respiration (δ13CRa), and heterotrophic respiration (δ13CRh) decreased with increase in temperature, and δ13CRa 13CRe 13CRh. The contribution of Ra and Rh to Re were 51.57 and 48.42%, respectively. Temperature and precipitation had inhibitory effects on Q10, 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 δ13C sensitivity to temperature. ? Northeast Forestry University 2025.