NDLI: Active and passive organic matter fractions in Mediterranean forest soils

Content Provider	Springer Nature Link
Author	Rovira, Pere Jorba, Montserrat Romanyà, Joan
Copyright Year	2010
Abstract	Soil organic carbon (C) is a complex set of pools, and to understand its dynamics it is necessary to know which of these pools are active at a given moment, and which act as passive, due to either physical protection or biochemical recalcitrance, or both. This matter has been studied mainly in agricultural soils. For forest soils, especially in Mediterranean areas, there is a data gap that needs to be filled. Therefore, we studied three profiles in Catalonia (NE Spain) over marl and under Pinus halepensis stands. Soil horizons were incubated under optimal conditions for 45 days. The respiration rate on day 45 was taken as basal respiration rate (BRR). The following fractions were quantified: (1) soluble C, (2) microbial C, both corrected (MCC) and uncorrected (MCUC) (i.e., applying or not a correction factor to account for the non-extractable microbial carbon), (3) C in size fractions, isolated by ultrasonic dispersion and sieving plus sedimentation, and (4) labile and recalcitrant C, quantified by acid hydrolysis, applied to both the whole soil horizons and the size fractions. The basal respiration rate (BRR) correlated best with the sum soluble + MCUC, which altogether seem the best estimator of the active C pool. The correlation between BRR and MCC was worse, thus suggesting that not all microbial C should be included in the active pool. The correlation of BRR with the C associated to coarse fractions (>50 µm) was positive, whereas that\with C associated to fine fractions (<20 µm) was negative. The correlations were lower than those obtained with the soluble + MCUC, thus suggesting that the coarse organic fractions are probably the main source of active C, but not active C itself. Alone, the pools obtained by acid hydrolysis (labile and recalcitrant) correlated poorly with BRR, but the combination of size fractionation with acid hydrolysis resulted in some of the best predictors of microbial activity. Hydrolyzable polyphenolic compounds inhibited microbial activity. Unhydrolyzable C associated to fine fractions (<20 µm) seemed the most stable of all the C pools studied. By contrast the unhydrolyzable part was apparently as unstable as the hydrolyzable part in the coarse organic debris. Overall, our results point to a hierarchy of constraints: both the physical protection and the biochemical quality affect microbial activity, but the physical protection goes first. In the profiles studied, C did not appear to be more stable in deep horizons than in surface horizons.
Starting Page	355
Ending Page	369
Page Count	15
File Format	PDF
ISSN	01782762
Journal	Biology and Fertility of Soils
Volume Number	46
Issue Number	4
e-ISSN	14320789
Language	English
Publisher	Springer-Verlag
Publisher Date	2010-02-12
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Soil organic matter Labile and recalcitrant SOM Active C fractions Microbial C Size fractionation Physical protection of SOM Carbohydrates Polyphenolics Mediterranean Forest soils Soil Science & Conservation Agriculture
Content Type	Text
Resource Type	Article
Subject	Agronomy and Crop Science Soil Science Microbiology

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