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- W2922945920 abstract "Abstract Land cover changes are recognized to affect the organic matter fractions and other soil properties with a consequence for microbial and enzyme activities involved in nutrient cycling. The topsoil (0–10 cm depth) C, N, and P microbial [i.e., basal respiration (BR), substrate inducted respiration (SIR), microbial biomass-C, -N, and -P (MBC, MBN and MBP)] ratios, enzyme (i.e., urease, invertase, acid phosphatase and arylsulfatase) activities, as well as the fractions of particulate organic matter (POC and PON) and dissolved organic matter (DOC and DON) were measured in a virgin natural forest dominated by Carpinus betulus and Parrotia persica (natural forest), mono-species Quercus castaneifolia stand (plantation), land including Citrus sinensis and Citrus tangerina trees (garden), land dominated by Brachypodium pinnatum and Carex sylvatica (rangeland) and land including rice cultivation (agriculture), following 32 years of land cover changes, located in northern Iran. The results showed that the soil MBN, MBP, PON, and DON were significantly higher under the natural forest site, while plantation enhanced BR, DOC, MBC/Corg, POC/PON, and DOC/DON. The planting of Quercus castaneifolia and preservation of natural forest significantly increased the amounts of soil SIR, MBC, POC, BR/MBC, and BR/SIR in comparison with the other studied land covers. Although the natural forest decreased the soil MBC/MBN and MBC/MBP indicators, the enzyme activities with maximum values of geometric mean of enzyme (GME) activities, urease/Corg, acid phosphatase/Corg, arylsulfatase/Corg, invertase/Corg, urease/MBC, acid phosphatase/MBC, and arylsulfatase/MBC were enhanced by Carpinus betulus and Parrotia persica stand. There were no significant differences (p > 0.05) in MBN/MBP ratio, Shannon's diversity index (H′) for enzyme activities, and invertase/MBC index among the forest ecosystems and anthropogenic sites. Based on PCA, the natural forest followed by tree plantation presented good conditions of soil fertility as well as microbial and enzyme activities. While these characters were mostly suppressed in the non-forest land covers. As a conclusion, ecological stoichiometry of microbial indicators reveals clearly more soil responses to land cover changes than absolute microbial activities which can be used to measure long-term variations in the topsoil." @default.
- W2922945920 created "2019-04-01" @default.
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- W2922945920 date "2019-06-01" @default.
- W2922945920 modified "2023-09-24" @default.
- W2922945920 title "Stoichiometry of microbial indicators shows clearly more soil responses to land cover changes than absolute microbial activities" @default.
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- W2922945920 doi "https://doi.org/10.1016/j.ecoleng.2019.03.009" @default.
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