科研之友
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摘要
Aim of study: Assessing the effect of soil development on the stand structure of a Spanish juniper forest traditionally shaped by livestock browsing and wood extraction. %26lt;br%26gt;Area of study: Berlanga de Duero (Soria, Castilla y Leon), Spain. %26lt;br%26gt;Material and methods: A stand inventory served to record stand structure. Tree age, height, DBH, basal area, and overbark volume were determined in each plot. Results were pooled considering two well-differentiated degrees of soil evolution. One-way ANOVAs (and Tukey%26apos;s test) and regressions between growth parameters were performed to assess significant differences between growth performances on both types of soils. %26lt;br%26gt;Research highlights: Deeper soils yielded significant higher plant density and stand stock figures than stony shallower profiles despite the intense past livestock activity in the area; and single tree-size was also significantly greater. Nonsignificant differences were found for merchantable junipers age (approximate to 420-160 years). Wood extraction and livestock browsing should be limited on shallower soils to allow soil and forest evolution; as well as to preserve the genetic pool better adapted to hardest growing conditions.
- 出版日期2014-4
