摘 要(英文)：The anthropogenic emission of nitrogen (N) compounds is increasing globally. In China, the emission of reactive N increased from 1.4×10~7 t•a~(-1) in 1961 to 6.8×10~7 t•a~(-1) in 2000. Currently this leads to deposition of 30～73 kg•hm~(-2)•a~(-1) in some forests of southern China. The possible impacts of elevated N input on vegetation, N cycling, acidification, and N leaching in tropical and subtropical forests have only been addressed in few studies. In China, the first such studies were carried out in the Dinghushan reserve (an IGBP-GCTE site) based on the design and methods used in the European NITREX project. The principal goal of this study was to measure the effects of nitrogen deposition on soil CO_2 emission and CH_4 uptake in soils of a nursery, pine forest (PF), pine and broadleaf mixed forest (MF), and monsoon evergreen broadleaf forest (MEBF) in the UNESCO/MAB Dinghushan Biosphere Reserve (DHSBR) in southern China. The nursery was dominated by the seedlings of three plant species (Schima superba,C ryp tocary a concinna and Castanop sis ch inensis).
鼎湖山苗圃和主要森林土壤CO_2排放和CH_4吸收对模拟N沉降的短期响应