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Spatiotemporal Variations of soil Microarthropod Communities in the Negev Desert

Pedosphere 2016年第4期26卷 451-461页

作者： Haggai WASSERSTROM Walter G.WHITFORD Yosef STEINBERGER The Mina and Everard Goodman Faculty of Life Sciences Bar-Ilan University USDA-ARS Jornada Experimental Range MSC 3JER New Mexico State University

Desert ecosystems are characterized by sparse vegetation that affects both abiotic parameters and soil biota along the soil profile. This study was conducted in 2010-2011 in a loess plain in the northern Negev Desert highlands, Israel, to test two main hypotheses： 1） the abundance and diversity of microarthropods would vary seasonally in the top 30-cm soil layer, but would be relatively stable at soil depths between 30 and 50 cm and 2） soil microarthropods would be more abundant in soils under shrubs with large litter accumulations than under shrubs with less litter or bare soil. soil samples were collected each season from the 0-50 cm profile at 10-cm intervals under the canopies of Hammada scoparia and Zygophyllum dumosum and from the bare interspa^es between them. soil moisture and soil organic carbon in the top 30-cm layers varied seasonally, but there was little variation in the soil layers deeper than 30 cm. soil mites were most abundant in the top 30-cm soil layer in autumn and winter, with the highest number of families found in winter. There were no differences in soil microarthropod abundance attributable to the presence or absence of shrubs of either species. The microarthropod communities of the microhabitats studied consisted of Acari, Psocoptera, and Collembola. The Acari were mostly identified to the family level and were dominated by Oribatida （55%） and Prostigmata （41%） in all seasons and microhabitats, while the psocopterans were most abundant in summer. These results are opposite to those obtained in other studies in similar xeric environments. Moreover, our findings were not in line with our hypothesis that a better microhabitat played a major role in microarthropod community composition, diversity, and density.

关键词： microhabitat seasonality shrub soil depth soil mites soil moisture soil organic carbon

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New and newly recorded species of the subgenus Flagellozetes(Cosmogalumna)(Acari:Oribatida:Galumnidae) from China

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Entomotaxonomia 2018年第2期40卷 104-111页

作者： Wenqin LIANG Maofa YANG Guoru REN Guizhou Center for Disease Control and Prevention Guiyang Guizhou 550004 China Institute of Entomology Guizhou University The Provincial Key Laboratory for Agricultural Pest Management of Mountainous Region Guiyang Guizhou 550025 China

Material and methods soil sample were collected by soil-corer and afterwards extracted using Tullgren funnels. Measurements and descriptions are based on specimens mounted in temporary cavity slides and studied using a light microscope equipped with a drawing tube. All body measurements are presented in micrometers. The body length was measured in lateral view, from the tip of the rostrum to the posterior edge of the ventral plate, to avoid discrepancies caused by different degrees of notogastral distension. Notogastral width refers to the maximum width in dorsal aspect. Lengths of body setae were measured in lateral aspect. Formulas for leg setation are given in parentheses according to the sequence trochanter-femur-genu-tibia-tarsus （famulus included）.

关键词： soil mites taxonomy distribution

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