Testate amoebae in 31 mature forest ecosystems - Densities and micro-distribution in soils

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• 作者：Otto Ehrmann^a ; Daniel Puppe^b ; ^c ; Manfred Wanner^b ; ^{wanner@tu-cottbus.de} ; Danuta Kaczorek^c ; ^d ; Michael Sommer^c ; ^e
• 关键词：MPN ; Most Probable Number ; WRB ; World Reference Base for Soil Resources ; SMR ; soil moisture regime ; SOC ; soil organic carbon ; Ct ; total carbon ; Nt ; total nitrogen ; Ccarb ; carbonate &ndash ; C
• 刊名：European Journal of Protistology
• 出版年：2012
• 期刊代码：4_09324739
• 类别：abs
• 出版时间：August, 2012
• 卷：48
• 期：3
• 页码：161-168
• 文件大小：1067 K

摘要

We studied testate amoebae and possible correlated abiotic factors in soils of 31 mature forest ecosystems using an easily applicable and spatially explicit method. Simple counting on soil thin-sections with a light microscope resulted in amoeba densities comparable to previously reported values, i.e. 0.1 脳 10⁸ to 11.5 脳 10⁸ individuals m^鈭? (upper 3 cm of soil). Soil moisture and soil acidity seem to be correlated with amoeba densities. At sites of moderate soil moisture regimes (SMR 2-7) we found higher densities of testate amoebae at pH < 4.5. At wetter sites (SMR 鈮?#xA0;8) higher individual densities were recorded also at less acidic sites. The in situ description of amoebae, based on the analysis of a complete soil thin-section, showed a relatively uniform spatial micro-distribution throughout the organic and mineral soil horizons (no testate amoeba clusters). We discuss the pros and cons of the soil thin-section method and suggest it as an additional tool to improve knowledge of the spatial micro-distribution of testate amoebae.