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Mixed Species Forest Experiments

Created 2022-02-04 16:12:58 and last modified 2022-03-25 14:32:35 CET
Began in 2022

Summary

There has been much debate in Swedish society regarding the benefits of mixed forests as an alternative to monoculture management in the managed forest landscape. Further, some research has suggested that mixed forests deliver more ecosystem services, including higher forest productivity. Existing analysis of the benefits of mixed forests has been almost entirely focused on correlation based approaches using national forest inventory type data; whereas, carefully implemented experiments designed to test species mixing effects are lacking. Experiments are needed to independently assess the benefits of mixed forests, and further identify which specific species combination achieve the highest growth.

mixed forestsmonocultureecosystem services

Project details

Suggested Focal Species:  Spruce (Picea abies), Pine (Pinus Sylvestris), Birch (Betula pendula), and Siberian Larch (Larix sibirica)

Randomized Block Design with 11 treatments (plots), 2 replicates
Each replicate has a defined density - High Density(HD) & Low

5 sites (+ 5 more sites later?)
( 2 Västerbotten/Vindeln,
1(2) Dalarna/Halsingland/Siljansfors,
2(1) Halland/Småland/Tönnersheden/Asa)

Planting spring 2023

11 plots (treatments) /density, site x 2 densities = 22 plots/site 
Mono species (4)
  Spruce,
  Pine, 
  Birch
  Larch 
Two Species Mixes (6) 
  Spruce/Pine   
  Spruce/Birch   
  Spruce/Larch 
  Pine/Birch 
  Pine/Larch
  Birch/Larch 
Four Species Mixes (1) 
  Spruce/Pine/Birch/Larch 

Plot size 33 x 30 m

High Density(HD) 1.5 m   
4444,4 trees/ha,  440 trees /plogt 
22 rows x 20 trees per row 
4 subplots within each plot,  56 trees (8 x 7)/subplot 

Low Density(LD) 2.25 m (average), 
1975,3 trees/ha,  196 trees /plot  
14 rows x 14 trees per row (2.36 m between rows, 2.14 m within rows) 
4 subplots within each plot, 25 trees (5 x 5)/subplot

6996 trees per site, 2.2 ha per site

     #Trees LD, Trees HD, Total
Spruce 539, 1210, 1749 
Pine     539, 1210, 1749 
Birch    539, 1210, 1749 
Larch   539, 1210, 1749
          2156,  4840,  6996 

Geographical information

Files

Proposed Mixed Species Forest Experiments implemented by T4F.docx
JW
T4F_Costestimation_Mixed_Swe.xlsx
JW
Mixed_exp_plot_design_v2.pdf
JW

Details

ID

355

Funding

T4F

Research stations

Infrastructures