Dynamics of Soil Properties and Ecosystem Carbon Stocks for Different Types of Land Use (Middle Taiga of Karelia)
2022
Dubrovina, I. A. | Moshkina, E. V. | Tuyunen, A. V. | Genikova, N. V. | Karpechko, A. Yu | Medvedeva, M. V.
The effect of land use changes on soil properties and ecosystem carbon stocks on Podzols in the middle taiga of Karelia was investigated. Changes in the soil profile morphology, major agrochemical and microbiological indicators of upper horizons, Cₒᵣg and Cₘᵢc stocks in the upper meter of soils, and structure of carbon pools at the key sites were analyzed. We studied a 130-yr-old mature pine forest as a control, arable land, hayfield, as well as young (15-yr-old) alder forest and middle-aged (65-yr-old) pine forest. The soils of the arable land, hayfield, and young alder forest were characterized by somewhat higher pH values and nutrient content at the C/N ratio of about 16. The highest contents of Cₒᵣg were noted in the soil of the arable land (2.7%) and middle-aged forest (3.9%) at the Nₜₒₜ content of 0.2%. In the soils of the arable land, hayfield and mature forest, the Cₘᵢc content varied within 129–167 mg C/kg soil, in the soils of the young and middle-aged forests, it was significantly higher: 312–447 mg C/kg soil. The maximum stocks of Cₘᵢc were recorded in the soil (121 g C/m²) and litter (70 g C/m²) of the young forest. In the soils of the arable land and middle-aged forest, the Cₘᵢc stocks were in the range of 70–81 g C/m²; in the hayfield and mature forest, 56 g C/m². The Cₒᵣg stocks in the one-meter soil layer reached maximum (205 t C/ha) in the soil of the arable land and decreased in the sequence hayfield—young forest—middle-aged forest—mature forest from 89 to 39 t C/ha. The total ecosystem carbon stock were maximum on the arable land (208 t C/ha), somewhat lower (180–193 t C/ha) in the mature forest, 152 t C/ha in the young forest, and minimum (96 t C/ha) in the hayfield.
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