文献类型：期刊文献

中文题名：喀斯特森林7种典型树种根际与非根际土壤呼吸及其温度敏感性

英文题名：Respiration and temperature sensitivity of rhizosphere and bulk soils across seven typical species in a karst forest

作者：巢林[1,6] 欧梦菲[1] 张力戈[2] 魏昕昕[1] 孙兆林[3,4] 裴广廷[1] 肖霜霜[1] 李忠国[5] 张建兵[1] 刘艳艳[1]

第一作者：巢林

机构：[1]北部湾环境演变与资源利用教育部重点实验室,广西地表过程与智能模拟重点实验室,南宁师范大学地理科学与规划学院,南宁530001;[2]福建师范大学地理科学学院,福州350007;[3]广西壮族自治区林业科学研究院,南宁530002;[4]广西漓江源森林生态系统国家定位观测研究站,桂林兴安漓江源森林生态系统广西野外科学观测研究站,桂林541316;[5]中国林业科学研究院热带林业实验中心,广西友谊关森林生态系统国家定位观测研究站,崇左532600;[6]湖南会同森林生态系统国家野外科学观测研究站,会同418307

年份：2025

卷号：31

期号：11

起止页码：1732-1743

中文期刊名：应用与环境生物学报

外文期刊名：Chinese Journal of Applied and Environmental Biology

收录：;北大核心:【北大核心2023】；

基金：国家自然科学基金项目(32201540);广西自然科学基金项目(2021GXNSFBA196021,2021GXNSFBA220028);中央引导地方科技发展基金项目(桂科AD20238078);中国博士后科学基金项目(2022M713194)资助。

语种：中文

中文关键词：土壤呼吸;温度敏感性(Q_(10));土壤有机碳分解;根际;喀斯特生态系统

外文关键词：soil respiration;temperature sensitivity(Qo);soil organic carbon decomposition;rhizosphere;karst ecosystem

分类号：S714

摘要：根际过程在土壤有机碳(SOC)循环过程中发挥着关键作用,而温度是调控SOC循环的重要因素之一.了解根际SOC分解对温度的响应(Q_(10))对于预测SOC循环对全球变暖的反馈至关重要.然而,不同树种对根际SOC分解及其Q_(10)的影响机制仍不清楚.以喀斯特森林7种典型树种根际与非根际土壤为研究对象,测定土壤性质、微生物生物量与胞外酶活性等指标,通过室内培养实验监测土壤呼吸速率,分析根际与非根际土壤呼吸速率及其Q_(10)特征,定量研究其影响因子.结果表明:(1)除碳氮比(C/N)外,不同树种根际土壤性质、微生物生物量和酶活性均差异显著(P<0.05).(2)不同树种之间根际土壤呼吸及其Q_(10)具有显著差异,其中细叶黄皮根际土壤呼吸速率最高;不同树种根际土壤Q_(10)变化范围为2.28-13.26,其中尾叶紫薇根际土壤Q_(10)最大,半枫荷Q_(10)最小;总体来看,根际与非根际土壤呼吸速率及其Q_(10)无显著差异.(3)随机森林模型表明,不同温度条件下影响土壤呼吸速率的主导因素不同,总氮(TN)和有效磷(AP)是影响15℃条件下土壤呼吸速率的重要因子;AP、微生物生物量碳(MBC)、N-乙酰氨基葡萄糖苷酶(NAG)和土壤含水量(SWC)是影响25℃条件下土壤呼吸速率的关键环境因子;SWC和可提取总氮(ETN)是影响Q_(10)最主要的因素.(4)偏最小二乘法路径模型(PLS-PM)分析发现土壤养分对土壤呼吸速率造成直接影响,土壤物理性质和养分含量对Q_(10)造成直接影响.可见,不同树种通过影响土壤理化性质和养分含量进而间接影响土壤呼吸速率和温度敏感性.本研究有助于丰富和提升关于喀斯特森林典型树种根际过程对全球变暖响应规律的认识.
Rhizosphere processes play a crucial role in the cycling of soil organic carbon(SOC),which is primarily regulated by temperature.Understanding the temperature sensitivity(Q_(10))of rhizosphere SOC decomposition is essential for predicting the feedback of SOC cycling to global warming.However,the mechanisms through which tree species identity influences rhizosphere SOC decomposition and its Q_(10) remain unclear.In this study,rhizosphere and bulk soils of seven common tree species in karst forest were sampled to assess their physiochemical properties,microbial biomass,and extracellular enzyme activities.Soil respiration and its Q_(10) were quantified using a short-term incubation method.The key findings were as follows:(1)Except for soil carbon-to-nitrogen ratio,there were significant differences in rhizosphere soil physiochemical properties,microbial biomass,and enzyme activities among the different tree species(P<0.05).(2)Rhizosphere soil respiration rates and Q_(10) values also differed significantly by species.The highest respiration rate was observed in Clausena anisum-olens,while Q_(10) values ranged from 2.28 in Semiliquidambar cathayensis to 13.26 in Lagerstroemia caudata.In general,no significant differences in respiration rates or Q_(10) were observed between rhizosphere and bulk soils.(3)A random forest model identified that the dominant factors influencing soil respiration varied with temperature.At 15℃,total nitrogen(TN)and available phosphorus(AP)were key drivers;at 25℃,AP,microbial biomass carbon,N-acetylglucosaminidase,and soil water content(SWC)were most influential.For Q_(10),SWC and extractable TN were the dominant factors.(4)Partial least squares path model analysis revealed that soil nutrients had a direct effect on soil respiration rate,whereas both soil physicochemical properties and nutrient content directly influenced Q_(10).In conclusion,tree species indirectly affect soil respiration rates and temperature sensitivity by influencing soil physicochemical properties and nutrient content.These findings enhance our understanding of rhizosphere processes and their responses to global warming in karst forests.