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Abstract
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| Soil-surface CO2 efflux and its spatial and temporal variation were investigated in a southern Mediterranean mixed pine-oak forest ecosystem in the north slope face of Sierra de Guadarrama in Spain. Measurements of soil CO2 efflux, soil temperatures and moisture were conducted on nine 1963 m2 sampling plots distributed in a gradient around the ecotone between Pinus sylvestris L. and Quercus pyrenaica Lam. forest stands. Total soil organic matter, Walkey-Black C, particulate organic matter, organic matter fraction below 53 µm, total soil nitrogen content, total soil organic carbon content and pH were also measured under three representative mature oak, pine and mixture pine-oak forest stands. Soil respiration showed a typical seasonal pattern with minimums in winter and summer and maximums in spring, more pronounced in oak and oak-pine stands. Soil respiration values were highest in pine stands during winter and in oak stands during spring and summer. Soil respiration was highly correlated with soil temperatures in oak and pine-oak stands when soil moisture was above a drought threshold of 15 The effects of soil properties on soil respiration were masked by differences in soil temperature and moisture during the rest of the year. Understanding the spatial and temporal variation even within small geographic areas is essential to accurately assess carbon budget at ecosystem level. Thus, this study bears important implications for the study of large-scale ecosystem dynamics, particularly in response to climatic change | |
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International
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JCR
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No |
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Title
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The Scientific World Journal |
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ISBN
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1537-744X |
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Impact factor JCR
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0 |
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Impact info
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Volume
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7 (1) |
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Journal number
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0 |
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From page
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166 |
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To page
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174 |
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Month
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SIN MES |
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Ranking
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