Long term effect of nitrogen addition on understory community in a Chinese boreal forest
作 者：Xing AJ, Xu LC, Shen HH*, Du EZ, Liu XY, Fang JY
影响因子:4.61
刊物名称:Science of The Total Environment
出版年份:2019
卷:646期: 页码:989-995
文章摘要:Increasing atmospheric nitrogen (N) deposition is an important driver ofbiodiversitychange. By conducting an eight-year N addition experiment (0, 20, 50 and 100 kg N ha^-1 yr^-1), we investigated thelong-term effectof simulated N deposition onunderstoryspecies composition and richness in aboreal forest, northeast China. We found that moss cover decreased significantly with increasing N addition. N addition had no significant effect onvascular plantsspecies richnessbut changed the plant community composition. The relative coverage of evergreen shrubs decreased, while that of graminoids increased under high-level N addition (100 kg N ha^-1 yr^-1). Under the high-level N treatment,Deyeuxia angustifoliacover increased significantly after 4 years, while that ofVaccinium vitis-idaeadecreased significantly after 3 years and almost disappeared after 5 years. The negative effect of N addition onmossesand evergreen shrubs accumulated over time, while the positive effect on graminoids increased during the first 4 years and did not change significantly thereafter. Our results suggest that the effect of N deposition varies across functional groups and shifts over time.