Dependency of Soil Organic Carbon Mineralization to Moisture and Temperature under Different Land Uses

Year 2019, Volume: 36 Issue: 3, 198 - 205, 31.12.2019

Emine Güler Rasim Koçyiğit İrfan Oğuz

https://doi.org/10.13002/jafag4543

Abstract

Temperature and humidity are the important environmental factors that control the decomposition of organic carbon in the soil. The sensitivity of the soils to temperature and moisture may vary. The aim of this study is to determine the change in mineralized C content of different soils (agriculture, pasture and forest) at different temperature (20 oC and 35 oC) and humidity conditions (30% and 60% of field capacity). This study was carried out in agriculture, forest and pasture lands in Almus district of Tokat province. In the study, soil samples were taken from 0-5, 5-15 and 15-30 cm depths by hand probe. Particle distribution, pH, lime, organic matter, total C, organic C, microbial biomass C and mineralize C were determined in the samples. Mineralize C content was determined by incubation of 30% and 60% of field capacity at 20 oC and 30 oC. Soils were generally classified as clay texture. The highest organic C was found in forest soil. Microbial biomass C showed significant change depending on land use. The difference between the land uses at 20 °C incubation was only observed at 60% of field capacity. The similar trend was also seen at 35 °C temperature. Significant differences have been observed between uses at high humidity conditions. While the increase in the amount of moisture significantly increased the amount of mineralize C in agricultural soil, the increase in temperature in forest soil was significant. This result indicates that the amount of mineralize C in the forest soil is more sensitive to temperature, while agricultural soil is more sensitive to the increase in moisture content.

Keywords

Land use, soil temperature, soil moisture, mineralize C

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