The Effect of Combined Ultraviolet B Radiation Enhancement and Acid Nitrogen Deposition on the Decomposition of Cunninghamia lanceolata Litter
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)radia-tion,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 depo-sition 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 dep-osition 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.Ad-ditionally,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.
Nitrogen depositionAcid depositionUltraviolet B radiation enhancementCunninghamia lanceolata litter
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