紫外线B辐射增强和酸氮沉降复合作用对杉木凋落物分解的影响  

The Effect of Combined Ultraviolet B Radiation Enhancement and Acid Nitrogen Deposition on the Decomposition of Cunninghamia lanceolata Litter

作　　者：郑立津 戴渊 陈水兰 刘爱琴[1] Zheng Lijin;Dai Yuan;Chen Shuilan;Liu Aiqin(Fujian Agriculture and Forestry University,Fuzhou 350002,P.R.China)

机构地区：[1]福建农林大学,福州350002

出　　处：《东北林业大学学报》2025年第1期57-63,共7页Journal of Northeast Forestry University

基　　金：国家重点研发计划项目(2021YFD2201304-05);中央财政林业科技推广项目(KEY23003XA)。

摘　　要：为了探究不同环境因子复合作用对杉木(Cunninghamia lanceolata)凋落物分解机制的影响,以杉木人工林凋落物为研究对象,采用野外环境控制试验方法,通过设置不同紫外线B辐射增强、酸沉降和氮沉降试验处理,进行紫外线B辐射增强与酸氮沉降复合作用对杉木凋落物分解过程处理1年的定位研究。结果表明:不同试验处理后,杉木凋落物的分解速率从大到小依次为氮沉降处理(0.69)、紫外线B辐射增强与氮沉降复合处理(0.64)、紫外线B辐射增强与酸氮沉降复合处理(0.59)、酸沉降与氮沉降复合处理(0.58)、对照(0.56)、紫外线B辐射增强处理(0.55)、酸沉降处理(0.54)、紫外线B辐射增强与酸沉降复合处理(0.52)。氮沉降处理、紫外线B辐射增强与氮沉降复合处理会促进凋落物分解,缩短凋落物分解的周期;酸沉降处理会减缓杉木凋落物分解的速率。紫外线B辐射增强、紫外线B辐射增强和酸沉降复合处理、酸沉降和氮沉降复合处理、酸沉降氮沉降和紫外线B复合处理,对杉木凋落物分解的速率没有明显的影响。To investigate the effects of the combined action of different environmental factors on the decomposition mechanisms of Cunninghamia lanceolata litter, we conducted a study using the litter of C. lanceolata plantations as the research subject. A field-controlled experimental approach was adopted, involving various treatments with enhanced ultraviolet B (UVB) radiation, acid deposition, and nitrogen deposition. A one-year targeted study was conducted to examine the effects of enhanced UVB radiation combined with acid and nitrogen deposition on the decomposition process of C. lanceolata litter. The results showed that, following the different experimental treatments, the decomposition rates of C. lanceolata litter ranked from highest to lowest as follows: nitrogen deposition treatment (0.69), enhanced UVB radiation combined with nitrogen deposition treatment (0.64), enhanced UVB radiation combined with acid and nitrogen deposition treatment (0.59), acid and nitrogen deposition combined treatment (0.58), control group (0.56), enhanced UVB radiation treatment (0.55), acid deposition treatment (0.54), and enhanced UVB radiation combined with acid deposition treatment (0.52). Nitrogen deposition and the combination of enhanced UVB radiation with nitrogen deposition were found to promote litter decomposition and shorten the decomposition cycle, while acid deposition slowed down the decomposition rate of C. lanceolata litter. Additionally, enhanced UVB radiation, the combination of enhanced UVB radiation with acid deposition, the combination of acid and nitrogen deposition, and the combined effects of acid deposition, nitrogen deposition, and UVB radiation did not have significant impacts on the decomposition rate of C. lanceolata litter.

关 键 词：氮沉降 酸沉降 紫外线B辐射增强 杉木凋落物 

分 类 号：S714[农业科学—林学]