蚂蚁筑巢对不同恢复阶段热带森林土壤易氧化有机碳时空动态的影响
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摘要
为探明热带森林恢复过程中蚂蚁筑巢对土壤易氧化有机碳(readily oxidizable carbon,ROC)时空动态的影响及机制,本研究以西双版纳白背桐(Mallotus paniculatus)群落、野芭蕉(Musa acuminata)群落和崖豆藤(Mellettia leptobotrya)群落3种恢复阶段热带森林为研究对象,设置"蚂蚁筑巢地"与"非巢地"2种处理进行野外控制实验,对比分析蚁巢和非蚁巢土壤ROC含量的时空变化特征,并揭示这些变化与土壤微生物生物量碳及理化性质之间的相互关系。结果表明:(1)蚂蚁筑巢显著影响热带森林土壤ROC含量(P<0.05),蚁巢土壤ROC含量较非蚁巢提高了14.2%。不同恢复阶段蚁巢与非蚁巢土壤ROC含量大小顺序为:野芭蕉群落>崖豆藤群落>白背桐群落。(2)不同恢复阶段热带森林蚁巢与非蚁巢土壤ROC含量均呈单峰型的时间变化趋势(P<0.05),最大值出现在6月,且各月份蚁巢土壤ROC含量均高于非蚁巢。(3)不同恢复阶段热带森林蚁巢和非蚁巢土壤ROC含量均随土层深度增加呈显著递减的垂直变化趋势(P <0.05),且蚁巢土壤ROC含量均大于非蚁巢(P <0.05)。(4)蚂蚁筑巢引起的土壤理化性质变化对土壤ROC含量产生了一定的影响。土壤ROC含量与土壤p H和容重呈显著负相关(P<0.05),与土壤有机碳、微生物生物量碳、全氮、铵态氮及硝态氮呈显著正相关(P <0.05)。土壤微生物生物量碳与总有机碳是蚁巢土壤ROC时空变化的主要贡献者,而铵态氮、全氮和总有机碳是非蚁巢ROC时空变化的主控因子。因此,蚂蚁筑巢改变热带森林土壤微生物量(如微生物生物量碳)及土壤理化性质(如总有机碳、铵态氮与全氮等),进而显著影响土壤ROC的时空动态。
This study aimed to understand the mechanism of ant colonization on spatiotemporal variations of soil ROC(readily oxidizable carbon) during the restoration of tropical forests. The experiment was conduced with two treatments(ant nests and without nests) in three restoration stages of Xishuangbanna tropical forests(i.e. Mallotus paniculatus, Musa acuminata, and Mellettia leptobotrya communities). We compared the spatiotemporal dynamics of ROC concentrations in both treatments and concurrently measured soil microbial biomass carbon and physicochemical properties. The results showed that:(1) Ant colonization significantly affected soil ROC concentrations in the tropical forests(P < 0.05), and ROC concentrations in ant nests increased by 14% compared with the control soils. Soil ROC concentrations in three recovery stages were ranked as Musa acuminata community > Mellettia leptobotrya community > Mallotus paniculatus community.(2) ROC concentrations in ant nests and the control soils both showed unimodal temporal variations across the three restoration stages(P < 0.05). The maximum was observed in June, and monthly ROC concentrations were higher in ant nests than in the control soils.(3) ROC concentrations in ant nests and the control soils decreased along the soil profile across three restoration stages(P < 0.05), and they were higher in ant nests(P < 0.05).(4) Variations in soil physicochemical properties induced by ant colonization influenced soil ROC dynamics. Soil ROC was negatively correlated with soil pH and bulk density and positively correlated with soil organic carbon, microbial biomass carbon, total nitrogen, ammonium nitrogen and nitrate nitrogen(P < 0.05). Microbial biomass carbon and total organic carbon in soils were the main contributors to the spatiotemporal variation in ROC in ant nests, while ammonium nitrogen, total nitrogen and total organic carbon were the main controlling factors for the spatiotemporal variation in ROC in control soils. Overall, ant colonization significantly altered soil microbes(e.g. microbial biomass carbon) and soil physicochemical properties(e.g. total organic carbon, ammonium nitrogen and total nitrogen), which impacted spatiotemporal variations in ROC concentrations in the tropical forest soils.
This study aimed to understand the mechanism of ant colonization on spatiotemporal variations of soil ROC(readily oxidizable carbon) during the restoration of tropical forests. The experiment was conduced with two treatments(ant nests and without nests) in three restoration stages of Xishuangbanna tropical forests(i.e. Mallotus paniculatus, Musa acuminata, and Mellettia leptobotrya communities). We compared the spatiotemporal dynamics of ROC concentrations in both treatments and concurrently measured soil microbial biomass carbon and physicochemical properties. The results showed that:(1) Ant colonization significantly affected soil ROC concentrations in the tropical forests(P < 0.05), and ROC concentrations in ant nests increased by 14% compared with the control soils. Soil ROC concentrations in three recovery stages were ranked as Musa acuminata community > Mellettia leptobotrya community > Mallotus paniculatus community.(2) ROC concentrations in ant nests and the control soils both showed unimodal temporal variations across the three restoration stages(P < 0.05). The maximum was observed in June, and monthly ROC concentrations were higher in ant nests than in the control soils.(3) ROC concentrations in ant nests and the control soils decreased along the soil profile across three restoration stages(P < 0.05), and they were higher in ant nests(P < 0.05).(4) Variations in soil physicochemical properties induced by ant colonization influenced soil ROC dynamics. Soil ROC was negatively correlated with soil pH and bulk density and positively correlated with soil organic carbon, microbial biomass carbon, total nitrogen, ammonium nitrogen and nitrate nitrogen(P < 0.05). Microbial biomass carbon and total organic carbon in soils were the main contributors to the spatiotemporal variation in ROC in ant nests, while ammonium nitrogen, total nitrogen and total organic carbon were the main controlling factors for the spatiotemporal variation in ROC in control soils. Overall, ant colonization significantly altered soil microbes(e.g. microbial biomass carbon) and soil physicochemical properties(e.g. total organic carbon, ammonium nitrogen and total nitrogen), which impacted spatiotemporal variations in ROC concentrations in the tropical forest soils.
引文
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Chen ZJ,Geng SC,Zhang JH,Setala H,Gu Y,Wang F,Zhang X,Wang XX,Han SJ(2017)Addition of nitrogen enhances stability of soil organic matter in a temperate forest.European Journal of Soil Science,68,189-199.
Diaz-Ravifia M,Acea MJ,Carballas T(1995)Seasonal changes in microbial biomass and nutrient flush in forest soils.Biology and Fertility of Soils,19,220-226.
Duval ME,Galantinib JA,Martimeza JM,Lopez FM,Wall LG(2016)Sensitivity of different soil quality indicators to assess sustainable land management:Influence of site features and seasonality.Soil&Tillage Research,159,9-22.
Folgarait PJ(1998)Ant biodiversity and its relationship to ecosystem functioning:A review.Biodiversity&Conservation,7,1221-1244.
Folgarait PJ,Perelman S,Gorosito N,Pizzio R,Fernandez J(2002)Effects of Camponotus punctulatus ants on plant community composition and soil properties across land-use histories.Plant Ecology,163,1-13.
Frouz J(2000)The effect of nest moisture on daily temperature regime in the nests of Formica polyctena wood ants.Insectes Sociaux,47,229-235.
Frouz J,Holec M,Kalcik J(2003)The effect of Lasius niger(Hymenoptera,Formicidae)ant nest on selected soil chemical properties.Pedobiologia,47,205-212.
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