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Soil moisture increment as a controlling variable of the “Birch effect”. Interactions with the pre-wetting soil moisture and litter addition

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Abstract

Aims

The Birch effect is a pulse in soil C and N mineralization caused by the wetting of dry soils, but the role of the soil moisture increment (ΔSWC) is still poorly understood. We quantified the relationship between ΔSWC and the Birch effect, and its interactions with pre-wetting soil moisture (preSWC) and substrate supply.

Methods

Two soils (clay loam and sandy loam) under a Pinus halepensis forest were subjected to rewetting in laboratory treatments combining different ΔSWC and preSWC values, with or without additional substrate (5 mg g-1 P. halepensis needles). Respiration flush (ΔR), changes in microbial biomass C (MBC) and net N mineralization (NMIN) were measured.

Results

Overall, we found a relationship with the form: ΔR = a ΔSWC + b, where the slope (a) was significant only when pre-wetting water potential was below a threshold value in the range of −100 to −1,200 kPa. However, the threshold alone does not fully describe the role of preSWC in slope variability. Substrate addition modified the ΔSWC sensitivity of Birch effect, enhancing it in the clay loam and suppressing it in the sandy loam.

Conclusions

The intensity of the wetting is a dominant factor regulating Birch effect, and ΔSWC is useful for its quantification.

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Acknowledgments

This work was supported by a fellowship from Generalitat Valenciana, Consellería de Educación, Formación y Empleo awarded to L. Lado-Monserrat (BFPI/2008/041). Thanks are due to Antonio del Campo for help in data analyses and to Antonio Lloret for laboratory work. The authors wish to thank Joana Oliver for invaluable laboratory support. The authors also thank two anonymous reviewers and Professor Stephan Glatzel from the University of Rostock, Germany, for the critical review of the manuscript.

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Correspondence to Luis Lado-Monserrat.

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Responsible Editor: Klaus Butterbach-Bahl.

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Supplementary data Fig. 1

Respiration and moisture dynamics in Chelva soil for rewetting combinations with (a) preSWC=0.05 g g−1, (b) preSWC=0.10 g g−1, (c) preSWC=0.15 g g−1 and (d) preSWC=0.20 g g−1. Closed arrows indicate the first wetting and open arrows the second wetting. (JPEG 856 kb)

Supplementary data Fig. 2

Respiration and moisture dynamics in Tuéjar soil for rewetting combinations with (a) preSWC=0.05 g g−1, (b) preSWC=0.10 g g−1, (c) preSWC=0.15 g g−1 and (d) preSWC=0.20 and 0.25 g g−1. Closed arrows indicate the first wetting and open arrows the second wetting. (JPEG 901 kb)

Supplementary data Fig. 3

Relationship between respiration rate and soil moisture throughout the incubation experiment in Chelva unamended (a), Chelva amended (b), Tuéjar unamended (c) and Tuéjar amended (d) soils. (JPEG 468 kb)

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Lado-Monserrat, L., Lull, C., Bautista, I. et al. Soil moisture increment as a controlling variable of the “Birch effect”. Interactions with the pre-wetting soil moisture and litter addition. Plant Soil 379, 21–34 (2014). https://doi.org/10.1007/s11104-014-2037-5

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