关键词: 中国东北样带, 土壤氮分布, 气候变化, CO₂浓度倍增, 干旱胁迫

Abstract: The community structure of spider in Zhangshiyan scenic area of Zanhuang County, Hebei Province, China was studied in July 2007. With sampling and sweep-netting together, 1 226 spider individuals were collected, which belonged to 24 families, 61 genera and 81 species. The species richness of the spider was abundant, and Agelenidae, Thomisidae, Linyphiidae, and Lycosidae were the dominant groups. Both the species number and the individual density in different habitats were different. Shrubs had the most species (54), highest density (20.9 ind·m^-2) and Shannon diversity index (3.264), forest floors had the highest concentration index (0.116) but the lowest evenness index (0.749), while bottomlands had the highest evenness index (0.853), which was related to the fact that most of the species were wandering spiders. The community structure of the spider was coincident with Fisher’s logarithm series distribution.

Key words: Northeast China Transect (NECT), Soil nitrogen distribution, Climate change, Doubled ambient CO_- concentration, Drought stress