The Nordic-Baltic-EFINORD Co-operation group for forest inventory. Mariehamn, 02/03 09 2015

Lithuanian NFI Country report. Interrelations between NFI and SFI Andrius Kuliešis, Gintaras Kulbokas, Albertas Kasperavičius

Lithuanian State Forest Service Pramonės ave. 11a, Kaunas, Lithuania. Email: [email protected], web: http://www.amvmt.lt

Lithuanian forest resource inventory system (FIS) I.

National forest inventory (NFI) by sampling method Regular (every 5 years) tree level inventory of forest land, using permanent and temporary plots. II. Forest stand inventory (SFI) and mapping Regular (every 10-15 years) forest stand level inventory of each forest stand by ocular or sampling (point, plot) methods. Future: control of all changes in the stand using forest management information. IIA. Tree level inventory of entire mature stands (MSI) per enterprise by sampling method III. Forest stand inventory before cuttings (IBC, final and intermediate) Tree level inventory of stands, appointed for cuttings, by sampling (point, plot) methods or enumeration of all trees.

Country report: Lithuanian NFI. SNS-EFINORD network meeting and scientific conference. Mariehamn, Finland. 2-3 September, 2015

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Development of large scale sampling forest inventory methods in Lithuania

Ist cycle

1960

1970

1980

1990

IInd cycle

IIIrd cycle IVth cycle

2000

2010

year

2020

1969 – first sample based large scale forest inventory of state forests (~1,48 mill ha, 5,000 temporary plots, plot size 50 – 800 m2).

1976 – continuous forest inventory by sampling of large forest tract (~5,000 ha, 188 permanent plots, variable plot size 50 – 800 m2).

1996 – pilot forest inventory by sampling of forest district (~3,000 ha, permanent and temporary plots, fixed plot size 400 m2).

1998 – continuous sampling NFI of entire Lithuanian forests (>2 mill ha, permanent and temporary plots, concentric plots 25, 100, 500 m2).

2012 – continuous sampling NLI (national land use inventory) of entire Lithuanian territory Country report: Lithuanian NFI. SNS-EFINORD network meeting and scientific conference. Mariehamn, Finland. 2-3 September, 2015

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Seventh standwise forest inventory and mapping Inventory of entire mature stands by sampling method

150m

500m

150m 500m

150m 150m

500m

150m

 Regular stand level inventory  Increment – by yield model  GIS under development since 1995  All forests no matter the ownership  Ortophotos are used both as cartographic background and for interpretation

2 sector

Country report: Lithuanian NFI. SNS-EFINORD network meeting and scientific conference. Mariehamn, Finland. 2-3 September, 2015

1 sector

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Interrelations in Forest inventory system (FIS) of Lithuania 1. Most of the models used in FIS are based on and tested using NFI data. 2. Tree level inventories, based on sampling methods, usually use the same standards as use stand level inventories.

3. NFI data serves for general forest management planning, evaluation of forestry efficiency at different ownership levels as well as for SFI quality estimation.

Country report: Lithuanian NFI. SNS-EFINORD network meeting and scientific conference. Mariehamn, Finland. 2-3 September, 2015

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1.Models, based on NFI data, are used by different inventories

Country report: Lithuanian NFI. SNS-EFINORD network meeting and scientific conference. Mariehamn, Finland. 2-3 September, 2015

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Generalized height/diameter model for 8 main tree species Generalized height – diameter model

Deviations of predicted by generalized height – diameter model and measured (NFI) heights, depending on mean diameter of stand and tree species

Pine

Spruce

Birch

Aspen

Black alder

Grey alder

Oak

Ash

Country report: Lithuanian NFI. SNS-EFINORD network meeting and scientific conference. Mariehamn, Finland. 2-3 September, 2015

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Forest stand yield model for 8 main tree species

500 m2

Mean annual gross increment for every forest stand during SFI is estimated according to tree species, mean stand age, height and stocking level (or growing stock volume)

ZM = f(A, 𝐇, S, M) Country report: Lithuanian NFI. SNS-EFINORD network meeting and scientific conference. Mariehamn, Finland. 2-3 September, 2015

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2. Harmonization of models, used in inventories with different – tree and stand – levels

Country report: Lithuanian NFI. SNS-EFINORD network meeting and scientific conference. Mariehamn, Finland. 2-3 September, 2015

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Tree stem and forest stand volume (form factor) functions NFI CASE APLICATION OF FORM FACTOR FUNCTION FOR EVERY TREE WITH H,m, D1.3,cm F=f (H) FT F=f (H,D)

TREE FORM FACTOR

SFI CASE APLICATION OF FORM FACTOR FUNCTION FOR EVERY FOREST STAND WITH H,m, D1.3,cm HF=f (H) FS HF=f (H,D)

FOREST STAND FORM FACTOR

RATIO

Spruce

Birch

Aspen

Country report: Lithuanian NFI. SNS-EFINORD network meeting and scientific conference. Mariehamn, Finland. 2-3 September, 2015

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Differences in mean stand height Between estimated directly from regression H/D function (SFI) and using Lorey method (NFI)

Country report: Lithuanian NFI. SNS-EFINORD network meeting and scientific conference. Mariehamn, Finland. 2-3 September, 2015

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3. Tree level inventories by sampling method serves as standards for evaluation of data reliability, received by stand level inventories

Country report: Lithuanian NFI. SNS-EFINORD network meeting and scientific conference. Mariehamn, Finland. 2-3 September, 2015

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Comparison of growing stock volume changes in 1961 – 2012, inventoried in state forests by NFI and SFI

Mature stands All stands

Country report: Lithuanian NFI. SNS-EFINORD network meeting and scientific conference. Mariehamn, Finland. 2-3 September, 2015

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Comparison of growing stock volume in mature stands, inventoried by SFI and sampling methods in 2008 – 2014 430 MSI

SFI

413

Growing stock volume, m3/ha

410

402

399

396 390

383

380

379

369

371

375

370

370 355 348

350

345

340

339

345

340

374

341

330

308 318

311 290

309

299 305

330

314 319

310

337

341

330

314

305

302

327 303

298 302

309 274

276 260

250

Pilot study

284 292

285 270

359 356

366

363

2008 -2009

2010 -2011

2011 -2012

2012 -2013

2013 -2014

Years of inventory

Enterprises with area of mature stands within 2 – 9 thous. ha Country report: Lithuanian NFI. SNS-EFINORD network meeting and scientific conference. Mariehamn, Finland. 2-3 September, 2015

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Estimation of potential wood use and forestry efficiency

Country report: Lithuanian NFI. SNS-EFINORD network meeting and scientific conference. Mariehamn, Finland. 2-3 September, 2015

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Potential total wood use in Lithuanian forests M = Q × KQ × (ZM – MO) × KM 9,3 = 2,1 × 0,85 × (8 – 1,5) × 0,8 M – commercial wood volume Q – forest area KQ – ratio of FAWS area and total forest area

ZM – mean gross annual increment during rotation period MO – natural losses KM – ratio of commercial and total stem wood volume – logging losses Country report: Lithuanian NFI. SNS-EFINORD network meeting and scientific conference. Mariehamn, Finland. 2-3 September, 2015

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Ratio of gross increment, final and intermediate wood use

Volume of stems, m3/ha

Pine

Spruce

Thinned or dead trees

Living trees

Birch

before 2012…

Age, years

Country report: Lithuanian NFI. SNS-EFINORD network meeting and scientific conference. Mariehamn, Finland. 2-3 September, 2015

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Control of annual increment use, NFI 2012 Gross increment 17,8 mln. m3

Accumulated volume (33,1%) 5,9 mln. m3 1,5 mill. m3 I – II forest group 4,4 mill. m3 III – IV forest group

Natural losses (16,3%) 2,9 mln. m3 0,4 mln. I – II forest gr. 2,5 mln. m3 III – IV forest gr.(21,3%) Dying m3

4,8 3,3 0,9 3,8

Final fellings (27%) Intermediate fellings (18,6%) Used by cuttings (5%) Unused wood

Felled volume (50,6%) 9,0 mln. m3

GV increment data: 2008-2012 Increment use data: 2003-2012 Source: NFI

Country report: Lithuanian NFI. SNS-EFINORD network meeting and scientific conference. Mariehamn, Finland. 2-3 September, 2015

Future prospects The implementation of main principles of continuity in stand level inventory: • establishment of geodetic network georeferenced forest line objects; • control of all changes in stands between inventories, using information from forest management; • further development of data, received by different inventories, integration methods • pilot studies of remote sensing technologies integration in stand level inventory. The further development of NFI as main source for GHG inventory database: • development of national land use inventory on NFI permanent plot network; • development of forest and yield models, modelling consequences of GHG emission/absorption changes on forest growth. 19 Country report: Lithuanian NFI. SNS-EFINORD network meeting and scientific conference. Mariehamn, Finland. 2-3 September, 2015

Thank you!