The interaction of warming and soil texture on responsiveness of the key soil processes i.e. organic carbon (C) fractions, soil microbes, extracellular enzymes and CO2 emissions remains largely unknown. Global warming raises the relevant question of how different soil processes will respond in near future, and what will be the likely regulatory role of texture? To bridge this gap, this work applied the laboratory incubation method to investigate the effects of temperature changes (10-50 °C) on dynamics of labile, recalcitrant and stable C fractions, soil microbes, microbial biomass, activities of extracellular enzymes and CO2 emissions in sandy and clayey textured soils. The role of texture (sandy and clayey) in the mitigation of temperature effect was also investigated. The results revealed that the temperature sensitivity of C fractions and extracellular enzymes was in the order recalcitrant C fractions > stable C fractions > labile C fractions and oxidative enzymes > hydrolytic enzymes. While temperature sensitivity of soil microbes and biomass was in the order bacteria > actinomycetes > fungi ≈ microbial biomass C (MBC) > microbial biomass N (MBN) > microbial biomass N (MBP). Conversely, the temperature effect and sensitivity of all key soil processes including CO2 emissions were significantly (P < 0.05) higher in sandy than clayey textured soil. Results confirmed that under the scenario of global warming and climate change, soils which are sandy in nature are more susceptible to temperature increase and prone to become the CO2-C sources. It was revealed that clayey texture played an important role in mitigating and easing off the undue temperature influence, hence, the sensitivity of key soil processes.

College of Forestry Sichuan Agricultural University Chengdu Sichuan China

Department of Applied Ecology Faculty of Environmental Sciences Czech University of Life Sciences Praha Suchdol Prague Czech Republic

Department of Biochemistry College of Science King Saud University Riyadh Saudi Arabia

Department of Soil and Environmental Sciences Ghazi University Dera Ghazi Khan Dera Ghazi Khan Pakistan

Institute of Environment and Sustainable Development in Agriculture Laboratory for Agricultural Environment Ministry of Agriculture and Rural Affairs Chinese Academy of Agricultural Sciences Beijing China

Landwirtschaftlich Gärtnerischen Humboldt Universität zu Berlin Berlin Germany

School of Environmental Science and Engineering Zhongkai University of Agriculture and Engineering Guangzhou China

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