武夷山亚高山草甸土壤呼吸组分特征及影响因素  

Characteristics of soil respiration components and influencing factors in the subalpine meadows of Wuyi Mountain

作　　者：葛小彩 李锦隆 孙俊[2,3] 武盼盼 胡丹丹 程栋梁 钟全林[1,2] GE Xiao-Cai;LI Jing-Long;SUN Jun;WU Pan-Pan;HU Dan-Dan;CHENG Dong-Liang;ZHONG Quan-Lin(Institute of Geography,Fujian Normal University,Fuzhou 350007,China;Fujian Key Laboratory of Plant Physiology and Ecology,Fujian Normal University,Fuzhou 350007,China;School of Resources and Environment,Anqing Normal University,Anqing,Anhui 246133,China)

机构地区：[1]福建师范大学地理研究所,福州350007 [2]福建师范大学福建省植物生理生态重点实验室,福州350007 [3]安庆师范大学资源环境学院,安徽安庆246133

出　　处：《植物生态学报》2025年第3期502-512,共11页Chinese Journal of Plant Ecology

基　　金：国家自然科学基金(32071555、32001294和31971643);福建省科技厅公益类重点项目(2022R1002002)。

摘　　要：武夷山亚高山草甸是亚热带中国东南部地区分布海拔最高的草甸,分析亚热带亚高山草甸土壤碳通量组分的变化特征,探究其与环境因子的关系及温度敏感性(Q10),对准确估计区域土壤碳收支和完善对亚高山草甸碳通量的认识具有重要意义。于2020年5月至2021年4月采用LI-8100 CO_(2)通量测定仪对武夷山山顶草甸土壤呼吸速率(RS)进行监测,并利用根去除法区分自养呼吸速率(RA)和异养呼吸速率(RH)。结果显示:(1)亚热带武夷山亚高山草甸土壤呼吸速率及组分动态均呈双峰曲线,5-10月,RS、RA、RH均高于其他月份。全年RA的变异幅度大于RH,RA在RS中占比约45%。(2)多模型比较分析表明武夷山亚高山草甸土壤温度(T)与土壤呼吸速率及组分呈指数增长关系,土壤呼吸速率及各组分的Q10排序为RA(Q10=1.96)>RS(Q10=1.94)>RH(Q10=1.67)。土壤湿度(W)对RS有一定影响,但与RA、RH关系不显著。T、W双因素模型对RS的拟合优于单因素模型,二者可共同解释48%的RS变异。综上,武夷山亚高山草甸土壤呼吸以异养呼吸为主,自养呼吸比异养呼吸对温度更敏感,土壤温度和湿度是影响武夷山亚高山草甸土壤呼吸的重要环境因子,低温和湿度大对土壤呼吸有抑制作用。该研究有助于增强对亚高山草甸土壤呼吸及组分季节动态和影响因素的认识,为区域土壤碳通量和碳循环研究提供数据支持。Aims The subalpine meadow of Wuyi Mountain is the highest meadows in the subtropical region of southeastern China.Identifying the variation characteristics of soil carbon flux components,and exploring their relationships with environmental factors and temperature sensitivity(Q10)are of great significance for accurately estimating regional soil carbon balance and improving the knowledge about carbon flux dynamics in subalpine meadows.Methods From May 2020 to April 2021,the LI-8100 CO_(2) flux analyzer was utilized to systematically monitor the soil respiration rate(RS)in the meadow located at the summit of Wuyi Mountain.Additionally,the root exclusion method was applied to distinguish between the autotrophic respiration rate(RA)and heterotrophic respiration rate(RH).Important findings(1)The dynamics of RS,RA and RH followed bimodal patterns,with consistently higher rates record from May to October compared to other months.Notably,the RA exhibited greater variability than RH throughout the year,accounting for 45%of RS.(2)A multi-model comparative analysis suggested that the temperature(T)exhibited an exponential correlation with soil respiration rate and its components in the subalpine meadow soil of Wuyi Mountain.The ranking of Q10 values for soil respiration rate and its components was RA(Q10=1.96)>RS(Q10=1.94)>RH(Q10=1.67).Although soil moisture(W)had a certain effect on RS,there was no significant relationship between RA and RH.The two-factor models including both T and W provided a better fit for RS than single-factor models,jointly explaining 48%of the variation in RS.In conclusion,soil respiration was primarily driven by heterotrophic respiration,while autotrophic respiration was more sensitive to temperature.Additionally,soil temperature and humidity were crucial environmental factors influencing soil respiration in the subalpine meadow of Wuyi Mountain,with soil respiration inhibited by low temperatures and high humidity.This study contributes to enhancing our understanding of the seasonal dynamics and inf

关 键 词：土壤呼吸 自养呼吸 异养呼吸 温度敏感性 亚高山草甸 

分 类 号：S812.2[农业科学—草业科学]