摘要
为探明“丛枝菌根(Arbuscular mycorrhiza,AM)真菌⁃植物⁃土壤”耦合作用对石漠化土壤呼吸季节动态的影响,采用LI⁃6400⁃09土壤呼吸室和便携式光合作用测量系统,对圆柏(Sabina chinensis)接种摩西斗管囊霉(Funneliformis mosseae,FM)、根内根孢囊霉(Rhizophagus intraradices,RI)2种AM菌种处理下土壤呼吸季节动态进行野外连续定位观测,并探究AM真菌接种处理下石漠化土壤呼吸速率与植物生长、土壤理化性质之间的关系。结果表明:(1)相较于对照,接种AM真菌对石漠化生境土壤呼吸季节动态产生了显著影响(P<0.01)。AM真菌处理具有较高的土壤呼吸季节变化幅度,即根内根孢囊霉处理土壤呼吸速率(1.55—9.10μmol m^(-2)s^(-1))显著高于摩西斗管囊霉(1.62—8.29μmol m^(-2)s^(-1))和对照(1.23—4.46μmol m^(-2)s^(-1));(2)AM真菌接种处理下土壤温湿度变化对土壤呼吸的影响显著大于对照,即土壤温度与水分对土壤呼吸的平均解释量大小顺序为:RI(44.84%;52.35%)>FM(17.18%;41.65%)>CK(2.66%;16.55%);(3)2种菌种处理下土壤呼吸速率均与土壤有机质、硝态氮、全氮、速效钾、树高、胸径及根系生物量呈显著或极显著正相关(P<0.01或0.05),而与pH呈极显著负相关(P<0.01),但对照处理土壤呼吸速率除与pH呈显著负相关(P<0.05)外,与其它土壤理化指标相关性不显著;(4)土壤温度和水分、硝态氮、铵态氮、有机质、易氧化有机碳、速效钾、全氮及全磷对土壤呼吸变化的贡献最大,而胸径、树高、有效磷、微生物生物量、根系生物量及pH的影响次之。因此,“AM真菌⁃寄主植物⁃土壤”相互作用对石漠化生境土壤呼吸季节动态的影响,主要取决于不同AM真菌接种处理对土壤微气候(如含水量)、碳素(有机质、易氧化有机碳)、无机氮库(铵态氮、硝态氮)、根系生物量及磷钾养分可利用性的调控。
This study aimed to expound the coupling effects of arbuscular mycorrhizal(AM)fungi,plants,and soils on seasonal dynamics of respiration rates in rocky desertification soils.We employed LI⁃6400⁃09 respiration chamber and portable photosynthesis measurement system to conduct a continuous field⁃positioning observation on seasonal dynamics of soil respiration rates under the inoculationSabina chinensisplants with two AM fungi species,i.e.,Funneliformis mosseae(FM)andRhizophagus intraradices(RI).Furthermore,we explored the association of respiration rates with plant growth and physicochemical properties under AM fungal inoculation treatments in rocky desertification soils.The results were as following:(1)the inoculation with two AM fungi species had a significant effect on seasonal dynamics of soil respiration rates in rocky desertification habitat,compared with the control treatment(CK,P<0.01).The treatments with two AM fungi species had a higher magnitude of seasonal variation in respiration rates compared with the CK in rocky desertification soils.The order of soil respiration rates was ranked as RI treatment(1.55—9.10μmol m^(-2)s^(-1))>FM treatment(1.62—8.29μmol m^(-2)s^(-1))>CK(1.23—4.46μmol m^(-2)s^(-1)).(2)Soil temperature and water content had a greater effect on soil respiration dynamics in AM fungal inoculations compared with the CK treatment.The contributions of soil temperature and water content to the variations in soil respiration rates were ranked as RI treatment(44.84%;52.35%)>FM treatment(17.18%;41.65%)>CK(2.66%;16.55%).(3)Soil respiration rates under AM treatments were positively correlated with soil organic matter,nitrate nitrogen,total nitrogen,available potassium,tree height,diameter at breast height(DBH),and root biomass(P<0.01 or 0.05),while they were negatively associated with soil pH(P<0.01).In contrast,soil respiration rates in CK treatment were negatively correlated with soil pH(P<0.05),but there was no significant correlation with other soil physicochemical properties.(4)Soi
作者
赵爽
王邵军
杨波
张昆凤
张路路
樊宇翔
ZHAO Shuang;WANG Shaojun;YANG Bo;ZHANG Kunfeng;ZHANG Lulu;FAN Yuxiang(College of Ecology and environment,Southwest Forestry University,Kunming650224,China;Co-Innovation Center for Sustainable Forestry in Southern China,Nanjing Forestry University,Nanjing210037,China)
出处
《生态学报》
CAS
CSCD
北大核心
2022年第21期8830-8838,共9页
Acta Ecologica Sinica
基金
国家自然科学基金项目(32060281,31660191)
云南省高校优势特色重点学科项目(05000511311)
云南省教育厅科学研究基金项目(2021Y235)。
关键词
石漠化
丛枝菌根(AM)真菌
耦合
土壤呼吸
氮库
碳库
调控因素
stony desertification
arbuscular mycorrhizal
coupling
soil respiration
nitrogen pool
carbon pool
regulatory factors
