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Comparison of soil respiration among three temperate forests in Changbai Mountains, China

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Abstract:

CO2 efflux from forest soils is an important process in the global carbon cycle; however, effects of stand age and successional status remain uncertain. We compared soil respiration and its relationship to soil carbon content, forest floor mass, root biomass, soil temperature, and soil moisture content among three temperate forest ecosystems in Changbai Mountains, northeastern China, from 2003 to 2005. Forest types included an old-growth, mixed coniferous and broad-leaved primary forest (MN), a middle-aged, broad-leaved secondary forest (BL), and a young coniferous plantation forest (CP). Average annual soil CO2 efflux at BL (1477.9± 61.8g C·m–2·year–1) was significantly higher than at CP (830.7± 48.7g C·m–2·year–1) and MN (935.4± 53.3g C·m–2·year–1). Differences in soil temperature among those sites were not statistically significant but contributed to the differences in annual CO2 efflux. In addition, the temperature response of soil CO2 efflux was higher at MN (Q10 = 2.78) than that at BL (Q10 = 2.17) and CP (Q10 = 2.02). Our results suggest that successional stage affects soil respiration by the differences in substrate quantity and quality, environmental conditions, and root respiration.

L’émission de CO2 par les sols forestiers est un processus important dans le cycle global du carbone. Cependant, les effets de l’âge et du statut successionnel du peuplement demeurent incertains. Nous avons comparé la respiration du sol et sa relation avec le contenu en carbone du sol, la masse de la couverture morte, la biomasse des racines, la température du sol et la teneur en humidité du sol dans trois écosystèmes de forêt tempérée dans les monts Changbai, dans le nord-est de la Chine, de 2003 à 2005. Les types de forêt incluaient une vieille forêt vierge mixte composée de conifères et de feuillus (MN), une forêt feuillue secondaire d’âge intermédiaire (BL) et une jeune plantation de conifères (CP). Les émissions annuelles moyennes de CO2 de BL (1477,9± 61,8g C·m–2·an–1) étaient significativement plus élevées que celles de CP (830,7± 48,7g C·m–2·an–1) et de MN (935,4± 53,3g C·m–2·an–1). Les différences de température du sol entre ces sites n’étaient pas statistiquement significatives mais contribuaient aux différences entre les émissions annuelles de CO2. De plus, la réponse des émissions de CO2 à la température du sol était plus forte à MN (Q10 = 2,78) qu’à BL (Q10 = 2,17) et CP (Q10 = 2,02). Nos résultats indiquent que le stade de succession influence la respiration du sol parce que la quantité et la qualité du substrat, les conditions environnementales et la respiration racinaire diffèrent.

Document Type: Research Article

Publication date: April 1, 2010

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  • Published since 1971, this monthly journal features articles, reviews, notes and commentaries on all aspects of forest science, including biometrics and mensuration, conservation, disturbance, ecology, economics, entomology, fire, genetics, management, operations, pathology, physiology, policy, remote sensing, social science, soil, silviculture, wildlife and wood science, contributed by internationally respected scientists. It also publishes special issues dedicated to a topic of current interest.
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