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

作　　者：王剑南 崔嵘 池成林 董立本 张吉利 WANG Jiannan;CUI Rong;CHI Chenglin;DONG Liben;ZHANG Jili(Harbin Research Institute of Forestry Machinery,National Forestry and Grassland Administration,Harbin 150086,China;Research Center of Cold Temperate Forestry,Chinese Academy of Forestry,Harbin 150086,China;Fuyuan National Key Field Observation and Research Station for Forest Ecosystem in Heilongjiang,Fuyuan 156500,China)

机构地区：[1]国家林业和草原局哈尔滨林业机械研究所,哈尔滨150086 [2]中国林科院寒温带林业研究中心,哈尔滨150086 [3]黑龙江抚远森林生态系统定位观测研究站,抚远156500

出　　处：《生态学报》2024年第22期10367-10376,共10页Acta Ecologica Sinica

基　　金：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);国家重点研发计划课题(2021YFD2200402)。

摘　　要：为明确气候变暖对蒙古栎林土壤碳排放的潜在影响,以三江平原蒙古栎次生林为研究对象,分析5—11月土壤呼吸组分对增温(1℃)和断根交互处理的响应。结果表明,增温使未断根组表层土壤平均升高1.35℃,断根组表层土壤平均升高0.65℃,表层土壤含水量平均升高0.02m^(3)/m^(3)(P<0.05),土壤总呼吸速率增加11.9%(P<0.05),土壤异养呼吸无显著变化(P>0.05)。各月份土壤异养呼吸速率占土壤总呼吸速率的比例均达到50%以上。土壤温度与土壤总呼吸速率、土壤异养呼吸速率均呈现指数正相关关系(P<0.01),土壤体积含水量与土壤总呼吸速率、土壤异养呼吸速率呈现线性负相关关系(P<0.01)。增温会导致土壤呼吸温度敏感性(Q_(10))降低,其中土壤总呼吸Q_(10)值降低0.45,土壤异养呼吸Q_(10)值降低0.39。不同月份Q_(10)存在差异,其中9月份最高,其次为8月份和10月份,11月份最低。双因素方差分析表明,以增温、断根为自变量时主效应存在(P<0.05),二者无显著交互作用(P>0.05)。模拟气候变暖初期蒙古栎林土壤总呼吸速率会显著升高,增加的土壤碳排放会进一步促进气候变暖,不同季节土壤呼吸速率升高幅度存在差异,夏季土壤碳排放要高于其它季节,而Q_(10)则是于夏季和秋季的过渡时段更高。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 0.02m^(3)/m^(3)(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(Q_(10)),with the Q_(10)value of total soil respiration decreasing by 0.45 and the Q_(10)value of heterotrophic soil respiration decreasing by 0.39.Q_(10)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

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 

分 类 号：S714[农业科学—林学]