Interaction effects of elevated CO2 and temperature on microbial biomass and enzyme activities in tropical rice soils

• Published in: Environmental monitoring and assessment Vol. 182; no. 1-4; pp. 555 - 569
• Main Authors: Das, Suvendu, Bhattacharyya, P, Adhya, T. K
• Format: Journal Article
• Language: English
• Published: Dordrecht Springer-Verlag 01-11-2011; Springer Netherlands; Springer; Springer Nature B.V
• Subjects: Agriculture; Agronomy. Soil science and plant productions; air temperature; alkaline phosphatase; Alkaline Phosphatase - analysis; Atmospheric Protection/Air Quality Control/Air Pollution; beta-glucosidase; beta-Glucosidase - analysis; Biochemistry and biology; Biological and medical sciences; Biomass; Carbon dioxide; Carbon Dioxide - analysis; Chemical, physicochemical, biochemical and biological properties; Dehydrogenases; Earth and Environmental Science; Ecology; Ecotoxicology; elevated atmospheric gases; Environment; Environmental impact; Environmental Management; Environmental Monitoring; Environmental testing; Enzymatic activity; enzyme activity; Enzymes; Enzymes - analysis; Experiments; Fluoresceins - analysis; Fundamental and applied biological sciences. Psychology; global warming; Greenhouse effect; High temperature; Hot Temperature; Laboratories; microbial biomass; Microbiology; Monitoring/Environmental Analysis; Oryza - growth & development; Oxidoreductases - analysis; Phosphatase; Physics, chemistry, biochemistry and biology of agricultural and forest soils; Soil - chemistry; soil enzymes; Soil Microbiology; soil organic carbon; Soil Pollutants - analysis; Soil science; soil temperature; Soils; Studies; Tropical Climate; tropical soils; urease; Urease - analysis; India; Enzyme activity; High temperature; Elevated CO; Rice soil; MBC; Monocotyledones; Temperature; Interaction; Carbon dioxide; Environmental factor; Increase; Microbial biomass; Cereal crop; Tropical soil; Medium enrichment; Oryza sativa; Enzymatic activity; Gramineae; Angiospermae; Spermatophyta
• ISSN: 0167-6369; 1573-2959
• DOI: 10.1007/s10661-011-1897-x

The impacts of elevated CO2 and temperature on microbial biomass and soil enzyme activities in four physicochemically different types of tropical rice soils (Aeric Endoaquept, Aeric Tropoaquept, Ultic Haplustalf and Udic Rhodostalf) were investigated in a laboratory incubation study. Soil samples were incubated under 400, 500 and 600 μmol mol − 1 CO2 concentration at 25°C, 35°C and 45°C for 2 months. Elevated CO2 significantly increased the mean microbial biomass carbon (MBC) content, across the soils, over control by 6.2%, 38.0% and 49.2% at 400, 500 and 600 μmol mol − 1 CO2 concentration, respectively. Soil enzyme activities (fluorescein diacetate hydrolase, dehydrogenase, β-glucosidase, urease, alkaline and acid phosphatases) also increased significantly ranging from 1.3% (urease) to 53.2% (alkaline phosphatase) under high CO2 in the soils studied. Both MBC and soil enzyme activities were further stimulated at high temperatures suggesting elevated CO2 and high temperature interaction accelerated the general turnover of the organic C fractions of the soil and through increase in microbially mediated processes.