Liu Ren-Tao, Zhu Fan, Chai Yong-Qing
Ying Yong Sheng Tai Xue Bao. 2014 Jan;25(1):228-36.
Taking the 6-, 15-, 24- and 36-year-old Caragana intermedia shrubs in desert steppe as a subject, an investigation on soil properties and ground arthropod community was carried out under the shrub and in the open to probe into the assemblage effect of ground arthropod community in desert steppe shrubs with different ages. The results were as follows: 1) In the 6-year-old shrubland, significant differences were only found in soil physical properties (soil texture, soil moisture and electrical conductivity) between the microhabitats under shrub and in the open. Beginning from the 15-year-old shrubland, however, soil organic matter and nutrition (N, P) increased significantly. 2) A total of 27 groups were captured in the studied sites which dominated by Carabidae, Tenebrionidae and Formicidae. From 6- to 15-year-old shrubland, the number of dominant groups decreased while that of common groups increased for the ground arthropod community under the shrub. From 15- to 24- and 36-year-old shrubland, the difference between the microhabitats under the shrub and in the open decreased firstly, and then increased. Some special groups appeared under the shrub in the 36-year-old shrubland, and dung beetles became dominant. 3) In the 6- and 24-year-old shrublands, there were no significant differences in group richness, abundance, and diversity index between the microhabitats under the shrub and in the open. As for the 15- and 36-year-old shrublands, however, significant differences were observed. 4) The shrub age had a stronger effect on the distribution of ground arthropods living under the shrubs compared to that in the open. The changes in soil texture, pH and electrical conductivity could significantly influence on the distribution of ground arthropods under the shrub, also in the open to some degree. It was suggested that the development of shrubland had strong impact on assemblage effect of ground arthropods, which was closely correlated with the stand age and would affect the recovery of sandy grassland ecosystems.
以荒漠草原6年生、15年生、24年生和36年生中间锦鸡儿灌丛为研究对象，对灌丛下和开阔地的土壤性质及地面节肢动物群落进行调查，以探究不同年龄荒漠草原灌丛对地面节肢动物群落的聚集效应。结果如下：1）在6年生灌丛地，灌丛下微生境与开阔地之间仅在土壤物理性质（土壤质地、土壤水分和电导率）上存在显著差异。然而，从15年生灌丛地开始，土壤有机质和养分（氮、磷）显著增加。2）在研究地点共捕获到27个类群，以步甲科、拟步甲科和蚁科为主。从6年生到15年生灌丛地，灌丛下地面节肢动物群落的优势类群数量减少，常见类群数量增加。从15年生到24年生和36年生灌丛地，灌丛下与开阔地微生境之间的差异先减小后增大。36年生灌丛地灌丛下出现了一些特殊类群，蜣螂成为优势类群。3）在6年生和24年生灌丛地，灌丛下微生境与开阔地之间在类群丰富度、多度和多样性指数上没有显著差异。然而，在15年生和36年生灌丛地，观察到了显著差异。4）与开阔地相比，灌丛年龄对灌丛下地面节肢动物分布的影响更强。土壤质地、pH值和电导率的变化对灌丛下地面节肢动物的分布有显著影响，在开阔地也有一定程度的影响。研究表明，灌丛地的发育对地面节肢动物的聚集效应有强烈影响，这与林分年龄密切相关，并会影响沙地草原生态系统的恢复。
