摘要
为研究酸雨对植物根系和土壤碳(C)、氮(N)、磷(P)含量、生态化学计量比特征及根系形态影响,以重庆乡土树种马尾松(Pinus massoniana)、杉木(Cunninghamia lanceolata)、香樟(Cinnamomum camphora)、毛竹(Phyllostachys edulis)为研究对象,于2021年5月进行酸雨模拟试验,设置4个不同处理水平,即CK(pH7.0蒸馏水)、pH4.5、pH3.5和pH2.5;模拟酸雨环境4个月后对植物根系形态及土壤和根系C、N、P含量进行测定。结果表明:1)在pH3.5条件下,杉木和香樟根系全氮含量受到显著抑制(P<0.05),与对照组相比,分别降低18.86%、35.66%,在pH4.5条件下马尾松土壤有机碳储量升高而毛竹土壤全氮产生流失;2)酸雨对各植物-土壤C∶N∶P影响不同,杉木、香樟根系C∶N在pH3.5条件下显著上升至50.26、61.33;在酸雨处理下,根系氮和磷变化趋势一致,马尾松、杉木、毛竹受到氮元素限制;3)不同植物根系在酸雨影响下表现不同,酸雨促进马尾松和杉木根系生长,抑制香樟和毛竹根系生长;4)根系形态与根系C∶N和根系全碳含量显著正相关,而与根系N∶P显著负相关。短期酸雨尚未破坏各植物-土壤整体平衡,杉木土壤缓冲能力强于马尾松、香樟、毛竹土壤,且根系对酸雨响应更加积极。
[Background]Acid rain is a prominent problem in southern China.It can affect the chemical element balance of plant and soil.Among them,carbon(C),nitrogen(N)and phosphorus(P)are important elements required for plant growth and development.And the response mechanisms of different plants and soils to acid rain vary.The study was conducted in Jinyun Mountain,a typical acid rain area in Southwest China.Four plant seedlings were selected for simulated experiments under different concentrations of acid rain.The response mechanisms of plants and soils to acid rain stress were investigated by analyzing plant root and soil C,N and P contents and ratios,as well as changes in plant root morphology under different acid rain concentrations.[Methods]The experiment took Chongqing native tree species Pinus massoniana,Cunninghamia lanceolata,Cinnamomum camphora and Phyllostachys edulis as the research objects,and conducted acid rain(SO 2-4∶NO-3=1∶1)simulation experiment in May 2021,with four different treatments,namely CK(pH 7.0 distilled water),pH 4.5,pH 3.5 and pH 2.5,described as pH7.0,pH4.5,pH3.5 and pH2.5 below.The plant root morphology and soil and root C,N and P contents were measured after 4 months in simulated acid rain environment.SPSS Statistics 22.0 was also applied for univariate analysis,Canoco 5 for redundancy analysis,and Origin 2021 for correlation analysis and graphing.[Results]1)At pH3.5,the root total N content of C.lanceolata and C.camphorar was significantly inhibited(P<0.05)and decreased by 18.86%and 35.66%,respectively,compared with the CK,and at pH4.5 the organic carbon stock of P.massoniana soil was elevated while the total N of P.edulis soil was lost.2)Acid rain had different effects on each plant-soil C∶N∶P.The root C∶N of C.lanceolata and C.camphora increased significantly to 50.26 and 61.33 at pH3.5.The trends of root nitrogen and phosphorus changes were consistent under the acid rain treatment,and P.massoniana,C.lanceolata and P.edulis were limited by nitrogen elements.3)Different plant roo
作者
朱君琳
侯瑞萍
王云琦
王玉杰
杨凤
张育萱
郑永林
司洪涛
ZHU Junlin;HOU Ruiping;WANG Yunqi;WANG Yujie;YANG Feng;ZHANG Yuxuan;ZHENG Yonglin;SI Hongtao(Three-Gorges Reservoir Area(Chongqing)Forest Ecosystem Research Station,Ministry of Education,School of Soil and Water Conservation,Beijing Forestry University,100083,Beijing,China;Three-Gorges Reservoir Area(Chongqing)Forest Ecosystem Research Station,School of Soil and Water Conservation,Beijing Forestry University,100083,Beijing,China;Academy of Forestry Inventory and Planning(AFIP),National Forestry and Grassland Administration,100714,Beijing,China;Observation and Research Station of Ecological Restoration for Chongqing Typical Mining Areas,Ministry of Natural Resources,Chongqing Institute of Geology and Mineral Resources,401120,Chongqing,China)
出处
《中国水土保持科学》
CSCD
北大核心
2023年第6期121-130,共10页
Science of Soil and Water Conservation
基金
北京林业大学热点追踪项目“长江上游生态保护与修复治理模式”(2021BLRD05)。
关键词
模拟酸雨
生态化学计量比
根系
土壤
simulated acid rain
ecological stoichiometry
root system
soil
