Abstract
Hydrology-oriented silviculture might adapt Mediterranean forests to climatic changes, although its implementation demands a better understanding and quantification on the water fluxes. The influence of thinning intensity (high, medium, low and a control) and its effect on the mid-term (thinned plots in 1998 and 2008) on the water cycle (transpiration, soil water and interception) and growth [basal area increment (BAI)] were investigated in 55-year-old Aleppo pine trees. Thinning enhanced a lower dependence of growth on climate fluctuations. The high-intensity treatment showed significant increases in the mean annual BAI (from 4.1 to 17.3 cm2) that was maintained in the mid-term. Thinning intensity progressively increased the sap flow velocity (v s) in all cases with respect to the control. In the mid-term, an increased functionality of the inner sapwood was also observed. Mean daily tree water use ranged from 5 (control) to 18 (high intensity) l tree−1. However, when expressed on an area basis, daily transpiration ranged from 0.18 (medium) to 0.30 mm (control), meaning that in spite of the higher transpiration rates in the remaining trees, stand transpiration was reduced with thinning. Deep infiltration of water was also enhanced with thinning (about 30 % of rainfall) and did not compete with transpiration, as both presented opposite seasonal patterns. The changes in the stand water relationships after 10 years were well explained by the forest cover metric. The blue to green water ratio changed from 0.15 in the control to 0.72 in the high-intensity treatment, with the remaining treatments in the 0.34–0.48 range.
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Acknowledgments
This study is a component of two research projects: “CGL2011-28776-C02-02, Hydrological characterisation of forest structures at plot scale for an adaptive management, HYDROSIL”, funded by the Spanish Ministry of Science and Innovation and FEDER funds, and “Determination of hydrological and forest recovery factors in Mediterranean forests and their social perception”, led by Dr. E. Rojas and supported by the Ministry of Environment, Rural and Marine Affairs. The authors are grateful to the Valencia Regional Government (CMAAUV, Generalitat Valenciana) and the VAERSA staff for their support in allowing the use of the La Hunde experimental forest and for their assistance in carrying out the fieldwork. The second author thanks the Mundus 17 Program, coordinated by the University of Porto—Portugal.
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Communicated by R. Matyssek.
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10342_2014_805_MOESM1_ESM.pdf
Supplementary material Fig. 1 Mean and standard deviation values of tree stemflow (l) and rainfall (mm) in the different spells studied for this variable. (PDF 35 kb)
10342_2014_805_MOESM2_ESM.pdf
Supplementary material Fig. 2 Mean daily values of sap flow velocity (cm h-1) as a function of the mean daily values of VPD (KPa) for each treatment (PDF 85 kb)
10342_2014_805_MOESM3_ESM.pdf
Supplementary material Fig. 3 Relationship between the blue to green water ratio (B/G) and forest cover (proportion). N= 5. The model was statistically significant at p-value<0.01. (PDF 37 kb)
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del Campo, A.D., Fernandes, T.J.G. & Molina, A.J. Hydrology-oriented (adaptive) silviculture in a semiarid pine plantation: How much can be modified the water cycle through forest management?. Eur J Forest Res 133, 879–894 (2014). https://doi.org/10.1007/s10342-014-0805-7
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DOI: https://doi.org/10.1007/s10342-014-0805-7