陕西纸房沟流域植被恢复区节肢动物群落种-面积、多度关系

以陕西纸房沟流域为研究单元，于2006-2008年，对该流域恢复区8种林分进行系统调查，运用不同模型分析了各林分节肢动物群落种-面积、多度关系.不同林分节肢动物群落种-面积关系符合S=CA_m，种类数随着面积增加接近一个常数，并得出相应最小调查面积，其大小排序为：自然灌木林＞自然乔木林＞杨树 刺槐混交林＞柠条-沙棘混交林＞柠条林＞沙棘林＞刺槐林＞柳树林，说明林分类型越复杂，需要调查节肢动物群落的最小面积越大.在抽样调查基础上建立了不同林分节肢动物种-多度模型，天然恢复林地节肢动物以对数正态模型(LN)的拟合效果最佳，表明群落中个体数量居中的节肢动物种类较多，稀有种和富有种种类较少，优势种不明显；在混交林和纯林中，节肢动物群落以对数柯西模型(LC)的拟合效果最佳，与天然恢复林相比，其节肢动物群落中稀有种和富有种种类较多，优势种比较突出.

Species-area and species-abundance relationships of arthropod community in various vegetation restoration areas in Zhifanggou watershed, Shaanxi Province of Northwest China

Taking the Zhifanggou watershed in Ansai, Shaanxi Province of Northwest China as a study unit, an investigation on the arthropods in 8 forest stands was conducted from 2006 to 2008, with the species area and species abundance relationships of the arthropods in these stands analyzed by various mathematical models. In these forest stands, the species-area relationship of the arthropods accorded with the formula S=CA_m. With the increase of investigation area, the species number approached to a constant, and the corresponding smallest investigation area was in the order of natural bush > natural forest > Populus davidiana＋Robinia pseudoacacia forest > Hippaphae rhamnoides+Caragana mocrophylla forest> Periploca sepium forest >Hippaphae rhamnoides forest > Robinia pseudoacacia forest > Caragana mocrophylla forest, indicating that the more complex the stands, the larger the minimum area needed to be investigated. Based on sampling investigation, the species-abundance models of the arthropods in various stands were established. Lognormal distribution model (LN) was most suitable to fit the arthropod community in natural recovery stands, suggesting that in the arthropod community, there were more species with medial individual amount and fewer abundant species and rare species, and no obvious dominant species. LogCauchy distribution model (LC) was most suitable to fit the arthropod community in mixed and pure stands. As compared with natural recovery stand, mixed and pure stands had more abundant and rare species, and more dominant species.