Soil respiration in a tropical grassland

Gupta, S. R. ; Singh, J. S. (1981) Soil respiration in a tropical grassland Soil Biology and Biochemistry, 13 (4). pp. 261-268. ISSN 0038-0717

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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.

Item Type:Article
Source:Copyright of this article belongs to Elsevier Science.
ID Code:73035
Deposited On:30 Nov 2011 07:28
Last Modified:30 Nov 2011 07:28

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