(项目批准号:31570444)人工林由于受到人为管理,林分结构相对简单,主要可分为乔木层和林下灌草层。尽管森林中的林下灌草植物对整个森林生态系统过程与性质可能有重要的影响,但是很多的研究只关注了森林中冠层乔木的影响,常常忽略了林冠下灌草的作用。特别是在大气氮沉降增加背景下林下灌草植物的响应及 (Project Approval No .: 31570444) Artificial forest management due to man-made, stand structure is relatively simple, can be divided into arbor layer and understory shrub layer. Although understory shrubs in forests may have a significant impact on the process and nature of the entire forest ecosystem, many studies have focused only on the effects of canopy trees in forests, often neglecting the role of candelabrum. Especially in the context of increased deposition of atmospheric nitrogen in response to understory grasses and plants