Soil respiration in a tropical grassland |
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| Authors: | SR Gupta JS Singh |
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| Institution: | Department of Botany, Kurukshetra University, Kurukshetra-132 119, India |
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| Abstract: | Soil respiration throughout an annual cycle was measured at three different stands in a tropical grassland situated at Kurukshetra at 29°58' N lat. and 76°51' E long. Rates of CO2 evolution were measured by alkali absorption using 13 cm dia × 23 cm aluminium cylinders inserted 10 cm into the ground. Both movable and permanently-fixed cylinders were used. The CO2 evolution rates for the three stands were: Stand I (dominated by Sesbania bispinosa) 49–358 mg CO2 m?2 h?1; Stand II (mixed grasses) 55–378 mg CO2m?2 h?1; and Stand III (dominated by Desmostachya bipinnata) 55–448 mg CO2 m?2 h?1. A positive significant relation existed between rate of CO2 evolution and soil water content (r = 0.59?0.740), and between soil respiration and temperature (r = 0.58?0.69). A statistical model developed on the basis of the relationship between CO2 evolution rates and certain abiotic environmental factors showed 69% comparability between the calculated and observed values of soil respiration. The contribution of root and root-associated microorganisms to total soil respiration was estimated at 42% using the relationship between root biomass and CO2 output from movable cylinders. |
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