Nitrogen mineralization after clearcutting and residue management in a second rotation Eucalyptus globulus Labill. stand in Galicia (NW Spain)

作者：Fernandez Cristina; Vega Jose A^*; Bara Salvador; Beloso Carmen; Alonso Margarita; Fonturbel Teresa

来源：Annals of Forest Science, 2009, 66(8): 807.

DOI：10.1051/forest/2009076

• harvesting
• clearcutting
• slash burning
• N mineralization
• Eucalyptus globulus
• logging residues

The effects of clearcutting and of different slash management procedures on N mineralization were assessed in a Eucalyptus globulus Labill. stand in Galicia (N W Spain). Treatments were no clearcutting (control), clearcutting combined with scattering, scattering fertilization, windrowing, and two types of slash burning with two levels of severity: broadcast burning and windrow burning. Changes in mineral N were monitored in the soil during the 18 months following the treatments. Eleven years later, the treatment effects were again evaluated during a twelve month period to assess long-term effects.
During the first study period, slash burning led to a marked increase in the contents of N-NH(4)( ), N-NO(3)(-) and N-mineralization in topsoil layers (0-10 cm). In contrast, clearcutting followed by either scattering or windrowing of residues had no effect on mineral N in the top soil or in situ mineralization, relative to the control. Ammonium was the predominant form of mineral N. No residual effects of the treatments were detected eleven years later.
Fire severity, in relation to slash burn type, had significant negative effects on post-burn N mineralization and nitrification in the first period studied, but no long-term residual effects were observed. Some practical consequences for sustainable management of such stands are suggested.

• 出版日期2009-12