Mixed stands of scots pine (Pinus Sylvestris L.) and norway spruce [Picea Abies (L.) karst] can be more productive than monocultures. evidence from over 100 years of observation of long-term experiments

Kamil Bielak, Małgorzata Dudzinska, Hans Pretzsch

Research output: Contribution to journalArticlepeer-review

81 Scopus citations

Abstract

Aim of study: The objective of this study was to analyse the effect of species mixing of Scots pine and Norway spruce on the productivity at the stand and species level. We also analysed to what extent the mixing effects is modified by drought stress. Area of study: The study was conducted in N-E Poland and based on three experiments located in Maskulinskie, Strzałowo and Kwidzyn Forest Districts. Material and methods: We evaluated long-term mixed-species experiments in Scots pine and Norway spruce which are under continuous survey since more than 100 years. Stand productivity was analysed based on the periodic annual increment and total yield of stem volume. Growth and yield were compared between mixed and neighbouring pure stands. As a substitute for the missing Norway spruce monocultures, we used appropriate yield table data. In order to characterize the effect of water supply on the mixing effects, we correlated the Martonne index of aridity with the ratio of Scots pine growth in mixed versus pure stands. Main results: We found that the mixed stands exceed the weighted mean of the pure stands’ volume productivity on average by 41%. At the species level Scots pine benefits from the mixture by 34% and Norway spruce by 83%. Growth periods with harsh climate conditions reinforce overyielding, while periods with mild conditions reduce the benefit of mixing. The overyielding of mixed stands, especially when growing under unfavourable conditions, is explained by niche complementarity of both species and discussed in view of the stress-gradient-hypothesis. Research highlights: The revealed overyielding of mixed compared with neighbouring pure stands, particularly under harsh weather conditions, substantiates the preferences of Scots pine-Norway spruce mixtures regarding climate change.

Original languageEnglish
Pages (from-to)573-589
Number of pages17
JournalForest Systems
Volume23
Issue number3
DOIs
StatePublished - 2014

Keywords

  • Competition
  • Drought resilience
  • Facilitation
  • Mixed stand
  • Overyielding
  • Pure stand
  • Underyielding

Fingerprint

Dive into the research topics of 'Mixed stands of scots pine (Pinus Sylvestris L.) and norway spruce [Picea Abies (L.) karst] can be more productive than monocultures. evidence from over 100 years of observation of long-term experiments'. Together they form a unique fingerprint.

Cite this