Recovery of organic matter and microbial biomass after abandonment of degraded agricultural soils: the influence of climateстатья
Статья опубликована в высокорейтинговом журнале
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Дата последнего поиска статьи во внешних источниках: 11 ноября 2019 г.
Аннотация:After abandonment of agricultural lands (ongoing on 220 million hectares worldwide),
degraded arable soils undergo self‐restoration and development towards natural ecosystems.
We studied the linkage between microbial properties and density fractions of soil
organic matter (SOM) during post‐agricultural restoration of former arable Phaeozems
and Chernozems. The chronosequence study was conducted in two contrasting bioclimatic
zones of European Russia: deciduous forest (Luvic Phaeozem) anddry steppe(Calcic
Chernozem). Each chronosequence included an arable soil, 3–4 soils with increasing
periods after abandonment (from 7 to 35 years), and reference sites with native soils.
The basal respiration (BR) and microbial biomass (Cmic) were closely correlated with the
soil organic carbon (Corg) content as well as SOM density fractions: free particulate
organic matter (fPOM), occluded particulate organic matter (oPOM), and mineral–
SOM. The greatest increase in most properties was common in the top 0–5 cm and
was maximal for fPOM and oPOM fractions (by 1.5–2.5‐times), Cmic (1.9‐times), and
BR (1.5–2.5‐times). For the first time, the duration of full recovery of soil properties
depending on climatewere estimated. Generally, ~40–120 and 20–30 years in the forest
and steppe, respectively, are required to restore Corg, total nitrogen (TN), and Cmic contents
in the 0‐ to 5‐cmlayer after the abandonment of agricultural lands. Themaximal restoration
rates of all properties are common in the first 15–20 years after abandonment.