生态学报2024，Vol.44Issue(22)：10367-10376,10.DOI:10.20103/j.stxb.202401140121
增温对蒙古栎林土壤呼吸及组分的影响
The effect of experimental warming on soil respiration and its components of Quercus mongolica forest
摘要
Abstract
To investigate the potential impact of climate warming on soil carbon emissions from Quercus mongolica forest,the response of soil respiration components to a 1℃ temperature increase and root-cutting interaction during the period from May to November was examined in a secondary forest dominated by Quercus mongolica in the Sanjiang Plain.The findings demonstrated that the average increase in surface soil temperature was 1.35℃ in the unbroken root group and 0.65℃ in the broken root group,while the average increase in surface soil water content was 0.02m3/m3(P＜0.05).Additionally,there was an 11.9％increase in soil total respiration rate(P＜0.05),with no significant changes observed in soil heterotrophic respiration(P＞0.05).The proportion of soil heterotrophic respiration rate to total soil respiration rate exceeded 50％in all groups during each month.The soil temperature exhibited a significant positive correlation with both the total respiration rate and heterotrophic respiration rate of the soil(P＜0.01),while the soil volume water content exhibited a significant negative correlation with both the soil total respiration rate and the soil heterotrophic respiration rate(P＜0.01).The increase in temperature led to a reduction in the sensitivity of soil respiration(Q10),with the Q10 value of total soil respiration decreasing by 0.45 and the Q10 value of heterotrophic soil respiration decreasing by 0.39.Q10 exhibited temporal variations,with the highest values observed in September,followed by August and October,while the lowest values were recorded in November.The two-way ANOVA revealed a significant main effect when temperature increase and root breaking were treated as independent variables(P＜0.05).However,no significant interaction between them was observed(P＞0.05).During the initial phase of simulated climate warming,there was a 11.9％increase in total soil respiration rate in Quercus mongolica forest in average,leading to an amplified emission of soil carbon and further exacerbating climate change.Seasonal variations were observed in the magnitude of this increase,with higher soil carbon emissions occurring during summer months and greater sensitivity to changes in temperature during the transition from summer to autumn.关键词
土壤呼吸/蒙古栎林/增温实验/土壤呼吸敏感性/土壤碳循环Key words
soil respiration/Quercus mongolica/warming experiment/soil respiration sensitivity/soil carbon cycling引用本文复制引用
王剑南,崔嵘,池成林,董立本,张吉利..增温对蒙古栎林土壤呼吸及组分的影响[J].生态学报,2024,44(22):10367-10376,10.基金项目
中央级公益性科研院所基本科研业务费专项资金项目(CAFYBB2020ZA001-1) （CAFYBB2020ZA001-1）
国家重点研发计划课题(2021YFD2200402) （2021YFD2200402）
