关键词: 流动沙地, 灌丛林营造, 地面节肢动物, 群落结构, 防沙治沙

Abstract:

The aim of present study was to probe into the effect of afforested plantations in terms of shrub species on ground-active arthropod communities in shifting sand land. The Artemisia ordosica， Hedysarum scoparium， Caragana korshinskii， and Calligonum mongolicum shrubs were selected as afforested subjects within straw checkboard， with the adjacent shifting sand land as a control. An investigation on ground-active arthropod community composition， diversity and trophic structure were carried on by the method of pitfall trapping. All the results were shown that： （1） Relative to the control， there was little change of number of taxonomic groups of dominant groups and common groups observed in A. ordosica， H. scoparium， and C. korshinskii plantations， while the number of rare groups increased remarkably. This point was reverse to the that observed in C. mongolicum plantations where no individuals of rare groups were captured. （2） The abundance， richness and Shannon index of ground-active arthropods were found to be significantly greater in A. ordosica plantations compared with the other three plantations. The biomass of ground-active arthropods was found to be significantly lower in A. ordosica plantations compared with the other three plantations. （3） There were four trophic groups observed including predator， phytophaga， saprophage， and omnivores. The abundance and richness of predator and saprophages were found to be highest in A. ordosica plantations compared with the other habitats. However， the abundance of phytophaga were found to be highest in H. scoparium plantations compared with the other habitats. （4） The abundance of herbaceous plants， soil pH and shrub canopy were the key factors driving the distribution of ground-active arthropod communities between the shifting sand land afforested by different shrub species. It was suggested that there was facilitative effect of A. ordosica plantations on ground-active arthropod diversity as well as the abundance and richness of predator and saprophages relative to the other three shrub plantations. In addition， there was a conducive effect of H. scoparium plantations on the abundances of phytophaga. Furthermore， there was limited effectiveness of single pure shrub afforestation on biodiversity conservation， while it was suggested that the mixed shrub afforestation played implications on the stability of afforested vegetation on desertification control.

Key words: shifting sand land, shrub plantation, ground-active arthropod, community structure, desertification control