Servizio Comunitario di Informazione in materia di Ricerca e Sviluppo - CORDIS

FP5

CARBO-INVENT Sintesi della relazione

Project ID: EVK2-CT-2002-00157
Finanziato nell'ambito di: FP5-EESD
Paese: Sweden

Carbon in swedish forest soils - evaluation of a soil survey data with focus on distribution, variation and relation to site factors

The objective of this study is based on SOC analysis, evaluate the relation between forest site factors and the soil organic carbon (SOC) stock of the organic layer and the 0-50cm of the mineral soil in Podzols, which is the most predominating soil type. In this study we used data from the Swedish National Soil Survey period 1993 - 2002 from which data were available from 8580 plots on forestland (production exceeding 1m3 yr-1 ha-1), and that were sampled during 1993 - 2001. Of this number almost 4777 were podsols, which was the most predominating soil type and common in almost all parts of Sweden.

The results showed that the coefficient of variation in the forest floor was ca 85% and with a mean SOC content in the forest floor of 3.3kg, a minimum of 3500 samples are needed to detect a significant change of 5% on p = < 0.05 level (*). The coefficient of variation in the forest floor plus mineral soil 0 - 50cm was 68%. With the mean SOC content in the forest floor plus mineral soil 0 - 50cm for all sub types of podsols of 8.2kg a minimum of 3500 samples are required to detect a significant change of 5% on p = < 0.05 level (*). The moisture conditions, ie the depth to the groundwater level, were of a profound significance for SOC stocks. For the forest floor the gradient was from 2.0 to 5.3kg C m-2, whereas corresponding figures for total soil to 50cm was 6.8 - 9.7kg. Other important site factors were latitude, temperature, site capacity, stand age and tree species.

Reported by

THE SWEDISH UNIVERSITY OF AGRICULTURAL SCIENCES
Dep of Forest Soils, SLU, box 7001
750 07 Uppsala
Sweden