南京林业大学学报（自然科学版）2024，Vol.48Issue(3)：90-98,9.DOI:10.12302/j.issn.1000-2006.202211030
酸雨类型转变对杉木林地土壤和细根生长的影响
Effects of acid rain-based transformation on Cunninghamia lanceolata fine root growth and soil nutrient content
摘要
Abstract
[Objective]This study explored the effects of acid rain-based changes in soil nutrient content and Chinese fir(Cunninghamia lanceolata)fine root growth,to provide a theoretical basis for improving soil acidification of C.lanceolata plantations in acid rain-stressed areas.[Method]A one-year simulated acid rain field experiment was conducted at the Tongshan Forest Farm in Nanjing,Jiangsu Province.Three acid rain acidity levels(pH=4.5,3.5,and 2.5)were applied with each of three acid rain types:sulfuric acid rain,with 5∶1 concentration ratio of sulfur(S,SO4)to nitrogen(N,NO3-);mixed acid rain,with 1∶1 S/N ratio;nitric acid rain,with 1∶5 S/N ratio;and a control(CK,pH=6.6,local river water).There were thus 10 total experimental treatments.Outcome measures of acid rain stress included soil chemical properties,fine root physiological characteristics,and fine root element contents.Correlations and structural equation model analyses were used to explore the direct and indirect effects of acid rain type on C.lanceolata fine root growth.[Result]With decreasing acid rain pH and S/N ratios,the fine root biomass and root activity of C.lanceolata decreased.The catalase activity of all strong acid rain treatments(pH=2.5)was lower than that of other acid rain treatments.Compared with nitric acid rain types,the catalase activity incrementally decreased and was lower than CK;Mg and Al content,as well as the c(Ca)/c(Al)and c(Mg)/c(Al)in fine roots also differed.Compared with CK,all acid rain treatments increased fine root Ca and Al contents,while K content decreased with acid rain stress.However,there were not significant differences in soil total C,total N,C/N ratio,total S,available P,or available K among S/N ratios or pH levels.Correlation analysis showed that soil pH was extremely significant positively correlated with c(Mg)/c(Al),root biomass,and root activity(P＜0.01),and that root biomass was significantly positively correlated with peroxidase,catalase,but extremely significant negative correlated with Al content(P＜0.05).[Conclusion]After one year of experimental acid rain stress,acidity significantly impacted both soil and C.lanceolata fine roots.Acid rain type affected fine roots more strongly than it affected soil.As the S/N ratio decreased,the inhibitory effect of acid rain on C.lanceolata fine root growth was more pronounced.关键词
杉木/酸雨/硫氮比/细根生物量/土壤养分Key words
Cunninghamia lanceolata/acid rain/sulfur to nitrogen ratio/fine root biomass/soil nutrient分类
农业科技引用本文复制引用
丁咏,廖艺,刘鑫,张金池,王宇浩,陈美玲,李涛,刘孝武,周悦湘,孙连浩..酸雨类型转变对杉木林地土壤和细根生长的影响[J].南京林业大学学报（自然科学版）,2024,48(3):90-98,9.基金项目
江苏省自然科学基金青年基金项目(BK20200785) （BK20200785）
江苏省研究生科研与实践创新计划项目(KYCX23_1240) （KYCX23_1240）
江苏高校优势学科建设工程资助项目(PAPD) （PAPD）
江苏省科技计划项目(BE2022420). （BE2022420）
