Small-scale spatial variability of soil chemical and biochemical properties in a rewetted degraded Peatland

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  • Wakene Negassa
  • Christel Baum
  • Andre Schlichting
  • Jürgen Müller
  • Peter Leinweber

There is indication in the literature that degradation of natural peatlands reduced spatial variability of soil chemical and biochemical properties. However, we lack empirical data on the impact of rewetting peatland on the spatial variability of these properties. We investigated the spatial variability of the soil properties of a peatland that has been used for extensive and intensive grazing from 1400 to 1970. The peatland has been rewetted since 1970, and we collected 50 soil samples from 50 grid cells of 0-10, and 10-20 cm soil depths in October 2001. We measured 33 important soil chemical and biochemical properties and evaluated the data with descriptive and geospatial statistical analyses. The concentrations of most plant available nutrients were low with high coefficients of variation CV that ranged from 15 to 117%, whereas the CV of most of the total and oxalate extracted elements was ≤15% CV. The degree of phosphorus P saturation DPS and P saturation ratio PSR were 11% and 0.05, which were low as compared to the threshold levels of 25% DPS and 0.11 PSR for mineral and wetland soils. The microbial biomass C and N ranged from 389 to 2,463mg kg1 and 32 to 215mg kg1 at the depth of 0-10 cmand from343 to 1570mg kg1 and 14 to 160mg kg−1 at the depth of 10-20 cm, respectively. Similarly, the dehydrogenase and b-glucosidase activities were lower by 76 and 61% at the soil depth of 10-20 cm compared to the upper 10 cm. The geospatial statistical analysis revealed that 87% of the soil chemical properties were spatially correlated and 85% of the spatial correlation was strong with <0.20 nugget to sill ratio at 5 to 12m ranges. Similarly, 86 and 71% of the biochemical properties were strongly spatially correlated at the depth of 0-10, and 10-20 cm, respectively, with ≤0.16 nugget to sill ratio at the short ranges 4 to 6m. The strong spatial correlation of most of the soil chemical and biochemical properties at short ranges indicate the high variability of the rewetted peatland.

Original languageEnglish
Article number116
JournalFrontiers in Environmental Science
Volume7
ISSN2296-665X
DOIs
Publication statusPublished - 2019
Externally publishedYes

Bibliographical note

Publisher Copyright:
© 2019 Negassa, Baum, Schlichting, Müller and Leinweber.

    Research areas

  • Biochemical properties, Nugget, Oxalate extractable soil nutrients, Soil variability, Spatial correlation

ID: 324672971