Subsidence, mire depth, biomass C and peat C before and after drainage on 4 long term forest research trials in south-eastern Norway
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1 Subsidence, mire depth, biomass C and peat C before and after drainage on 4 long term forest research trials in south-eastern Norway Lise Dalsgaard, Nicholas Clarke Departments of Forest and Climate and Terrestrial Ecology, NIBIO Final meeting SNS-120: Anthropogenic greenhouse gas emissions from organic forest soils: improved inventories and implications for sustainable management Helsinki, October 31 November 2, 2018
2 Outline Background Preliminary results To do further
3 Forest Drainage, Norway, all categories, area in hectares Drainage of new areas for forest forbidden in 2007 The main driver 100 years ago: low-stocked stands, dimension cutting, lack of timber resources 3
4 Long term forest production Biomass/timber, production, stability, quality Carbon accumulation Regeneration, ornamental, game, berries, recreation trials Operative peatland trials in Norway: 174 9: A trials 74: B trials 91: No activity, records kept Currently ca trials in total; ca. 600 are operative trials; trees remeasured everay 5-10 years. Green: operative Red: closed trials
5 Challenging detective work in old archives before and after field data collection November 7, 2018 Side
6 EXAMPLE NO. 1 «Enerholmen» Field trial in Løten, Hedmark. Drained in Fertilization treatments 6
7 Enerholmen Drainage 1972 MAT 3.3 deg C MAP 565 mm Gongemyr, Øvre Mastmyr drainage 1965 MAT deg C MAP mm site prep. at stand establishment Akersmyr Drainage 1957 MAT 6 deg C MAP 1029 mm (no mire depth 1957)
8 People Jørgen and Stig supporters of peatland forestry. Kari showing Helge how to ruin your back. Nicholas caught something in the peat. Jan and Eirik demonstrating how to NOT ruin your back. November 7, 2018 FIELD WORK SUMMER AND FALL and a hard working levelling and tree measurement team. Side
9 METHOD OVERVIEW Mire depth and elevation (levelling) (Akersmyr) 1965 (Gongemyr, Øvre Mastmyr) 1972 (Enerholmen) Tree measurements 1) in long term field trial plots, 2) 4 m radius of elevation plot; all trees > 2.5 cm dbh. Soil sampling at most elevation plots in drained forests and in reference mires. Large corer (1.0 m depth, 8x8 cm 2 ) where possible (mostly in reference mires) and 2 x small corer (0.6 m depth, 6x4 cm 2 ) in most forest plots.
10 Aker1 Aker1 Ref#2 Aker1 Gong22 Gong22 Mast79 Mast79 Ref_photo#2 Telemark Ref_photo#1 Telemark Photo: Gunnhild Søgaard, NIBIO. Date: May 16,
11 PRELIMINARY RESULTS. MIRE DEPTH 2017, m MIRE DEPTH 2017 VS. OLD, m
12 CHANGE IN MIRE DEPTH 2017-OLD, m CHANGE (DEPTH VS ELEV) 2017-OLD, m
13 ELEVATION 2017 VS. OLD, m ELEVATION CHANGE, OLD, m (y-axis site specific or identical)
14 C IN PEAT Peat from Ref. mire 2 in Telemark Peat from Ref. mire near Tønsberg 14
15 C (kgm-2) C (kgm-2) C (kgm-2) C STOCKS Gongemyra Øvre mastmyr Referanse 1 Referanse 2 Referanse 3 Referanse 4 Referanse Enerholmmyra Referanse 1 Referanse 2 Referanse Referanse Depth (cm) Depth (cm) Depth (cm) Akersmyra Referanse NB1: C data from drained mires not stratified by distance to edge/ditch NB2: Depth intervals on x- axes vary (0-10, 10-20, 20-40, 40-60, cm); depths given are mid-points 15
16 C (%) C (%) C (%) RELATIONSHIP BETWEEN PEAT C AND BULK DENSITY Reference Gongemyra/Øvre mastmyr Bulk density (g cm-3) Gongemyra Bulk density (g cm-3) Øvre mastmyr NB: C data not stratified by depth or distance to edge/ditch Bulk density (g cm-3) 16
17 BIOMASS C 2017, no trees = 0 BIOMASS C 2017, no trees = NA Kg C/m2
18 BIOMASS C 2017 AND ELEVATION CHANGE 2017 OLD, m SOME CONCLUSIONS, WHAT TO DO NEXT Elevation measurements biased in gong22, mast79 Change in elevation not= change in depth (possibly in ener3) Aker1 ~ elevation: significant subsidence (ca. 0.5 m) Ener3 ~ elevation: no significant subsidence Based on depth: no indication of significant subsidence No clear indication that distance to ditch controls subsidence; but possibly Aker1 to be further tested Factor 3 difference in biomass C stocks among sites No clear indication that biomass C and subsidence related extend to soil C stock change estimates (high tree density and growth may increase both C input and decomposition).finish lab work on soil samples.complete evaluation of relationship between C concentrations and bulk density.establish soil C balance.find relevant spatial scale for C balance
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