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Pedosphere 26(4): 499--509, 2016
ISSN 1002-0160/CN 32-1315/P
©2016 Soil Science Society of China
Published by Elsevier B.V. and Science Press

Surface soil properties influence carbon oxide pulses after precipitation events in a semiarid vineyard under conventional tillage and cover crops

F. PEREGRINA

CSIC-CAR-UR, Instituto de Ciencias de la Vid y el Vino (ICVV), Finca La Grajera, Carretera de Burgos Km. 6, 26007 Logroño (Spain)

ABSTRACT

In semiarid regions of the Mediterranean basin, a rainfall event can induce a respiratory pulse that releases a large amount of soil carbon dioxide (CO₂) into the atmosphere; this pulse can significantly contribute to the annual ecosystem carbon (C) balance. The impacts of conventional tillage and two different cover crops, resident vegetation and Bromus catharticus L., on soil CO₂ efflux were evaluated in a Vitis vinifera L. vineyard in La Rioja, Spain. Soil CO₂ efflux, gravimetric water content, and temperature were monitored at a depth of 0--5 cm after rainfall precipitation events approximately every 10 d in the period from May 17 to July 27, 2012, during which the cover crops had withered. Additionally, on June 10, 2012, soil organic C, microbial biomass C, and β-glucosidase activity were determined at soil depths of 0--2.5, 2.5--5, 5--15, and 15--25 cm. The results show that pulses of soil CO₂ were related to the increase in soil water content following precipitation events. Compared to the conventional tillage treatment, both cover crop treatments had higher soil CO₂ efflux after precipitation events. Both cover crop treatments had higher soil organic C, microbial biomass C, and β-glucosidase activity at the soil surface (0--2.5 cm) than the conventional tillage treatment. Each pulse of CO₂ was related to the surface soil properties. Thus, this study suggests that the enhancement of soil organic C and microbiological properties at the soil surface under cover crops may increase soil CO₂ efflux relative to conventional tillage immediately after precipitation events during the dry season.

Key Words: microbial biomass C, β-glucosidase activity, soil CO₂ efflux, soil water content, soil temperature

Citation: Peregrina, F. 2016. Surface soil properties influence carbon oxide pulses after precipitation events in a semiarid vineyard under conventional tillage and cover crops. Pedosphere. 26(4): 499-509.

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