Seasonal drought in Mediterranean soils mainly changes microbial C and N contents whereas chronic drought mainly impairs the capacity of microbes to retain P
نویسندگان
چکیده
Intensification of droughts may aggravate the generally low capacity Mediterranean soils to store C and nutrients induce soil C:N:P stoichiometric imbalances through its impact on microbial biomass activity. Soil microbes nonetheless have different responses seasonal chronic drought, but very few studies investigate long-term drought periods under field conditions. This study compares effects versus impacts 16 years experimental assess implications for nutrient availability biogeochemical functioning in a forest. The treatment reduced substantially persistently C, N particularly P, probably due P-sparing community shifts or adaptations. smaller pool lower mineralization activity contributed accumulation C- N-rich organic compounds mineralized forms during vegetation growing season. As result, conditions increase risks losses from plant-soil system ecosystems. Microbial C:N ratios remained unaltered compared control, likely associated with equivalent osmolytes by communities. In contrast, increased content relative response also considerably P pool. Therefore, while was more sensitive water stress, were closely coupled fluctuations availability.
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ژورنال
عنوان ژورنال: Soil Biology & Biochemistry
سال: 2022
ISSN: ['0038-0717', '1879-3428']
DOI: https://doi.org/10.1016/j.soilbio.2021.108515