Browsing by Author "Gajda, Anna"

Now showing 1 - 1 of 1
  • Thumbnail Image
    Item
    Particulate organic matter and microbial biomass c contents in soils with different mechanical structure
    (IUNG-PIB, 2005) Gajda, Anna; Martyniuk, Stefan
    The studies were based on a long-term microplot experiment located at Pulawy Experimental Station ofthe Institute ofSoil Science and Plant Cultivation - National Research Institute (IUNG-PIB). There were 18 of 1.5 m2 experimental microplots (1.0 m x 1.5 m, and depth 1.5 m) filled at the bottom with silt loam as a bed rock, and at the top with: 1 - black earth, 2 - alluvial soil, 3 -Ioess, 4 -light loam, 5 -light loamy sand underlaid with clay loam, 6 -light loamy sand underlaid with slightly loamy sand. The aim was to compare the partieulate organie matter (POM) quantities and microbial biomass C contents in soils with different mechanical structure. The obtained results showed a significant correlation coefficient (R = 0.883, a = 0.05) between soil organic matter (SOM) and particulate organic matter (POM) contents. However, in our studies this relationship seems not to be a clear-cut one. For example, the highest amount of POM (5.5 g per kg of soil) was detected in the alluvial soil, which contained significantly less SOM than the black earth. AIso, the coarse-textured soils contained almost the same amount of POM (2 g per kg of soil) as the light loam substantially richer in SOM and the silt-clay fraction. Moreover, the POM fraction expressed as the percentage of SOM was lowest (16.3%) in the black earth (richest in SOM) and highest (26.0%) in the loess soi!. More interestingly, the two coarse-textured soils (light loamy sands) with low contents of SOM had also almost as high percentages (24-25%) of the POM fraction in their SOM as the loess soi!. Microbial biomass expressed as a percentage of biomass C in the total amount of soil organic C content was highest in the black earth and lowest in the light loamy sand and it comprised 2.4-3.2% of the total amount of organic C in all tested soiI types.