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Urban timber volume estimation

Technische Universität München. Urban timber volume estimation. How to measure forests in urban areas with limited resources. Content. Technische Universität München. Need of forest measurements Single tree volume measurement Measuring forest stands Methodological background

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Urban timber volume estimation

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  1. Technische Universität München Urban timbervolumeestimation How to measure forests in urban areas with limited resources

  2. Content Technische Universität München • Need offorestmeasurements • Single treevolumemeasurement • Measuringforeststands • Methodologicalbackground • Urban forestcover • Application in Dar es Salaam • Draftresults • Considerations • References

  3. Need offorestmeasurements Technische Universität München Threeprinciplereasons (WEST, 2004): • Tohelpwithdecisionsabouthowto manage forestat different scales (timberimport/export; sourceofemployment/watersupply; contributiontoincome) • Toassisttheirmanagement (levelofchangeover time; timbersupply in thelongterm) • Research (factorsdeterminingforestgrowth; climateimpacts; etc.)

  4. Single treevolumemeasurement Technische Universität München Pictures from AVERY & BURKHARD, 2002; tablebelowadaptedfrom WEST, 2004

  5. Measuringforeststands Technische Universität München • Using stand volumetables: limited tomonocultures, nodynamics Stand volumetableforScotsPine in northeastern Germany (LEMBCKE, KNAPP & DITTMAR, 2000)

  6. Measuringforeststands Technische Universität München • Conducta completesurvey, i.e. measuring all treesof a singleforest stand: limited tosmallstands (time andcostintense) • Conduct an inventory, i.e. measuringsamplesoftheforest stand: different inventorydesigns • Random sampling • Block sampling • Stratifiedsampling • Systematicsampling • … • … Problem: they all needgroundmeasurements…

  7. Methodologicalbackground Technische Universität München Howtomeasureforestwhereresources (time, money, persons, accessrights etc.) are limited? Idea: Toadaptthestatement: “…FAO estimated total growing stock by taking subregionalaverages of growing stock per hectare and multiplying these by the forest area for the respectiveyears.“ (FAO 2010) forour UMT and LC Analysis

  8. Urban forestcover Technische Universität München • Part ofthe LC-analysis • Treecoverclassesaccordingto FAO landcoverclasseshavetobedefined • Def. offorest (FAO 2010): landspanningmorethan 0.5 ha with a minimumtreeheightof 5m andat least 10% treecover • Def. of OWL: …5-10% treecoveroraccumulatedcoveroftrees, shrubsandbushesabove 10% UMTs Land coveranalysis UMTs withtreecover

  9. Application in Dar es Salaam Technische Universität München • Case study: Dar es Salaam (areaofwholecityaccordingto UMT mapapproximately 1500 km²?) • Inputs: aerialimageof2008 (pixelsizeapproximately 0,45m*0,45m), Urban Morphology Type Map (extentcoveringapproximately 390 km²) • firstlandcoveranalysesforUMTs „1.3 Mixed farming“ and „2.5 Bushland“ • Differentiatedtreecoverbytree/crownsize • for Dar 2 classesdistinguishedbycrowndiameter (threshold 6m diameter): • Large trees • Small trees/shrubs

  10. Draftresults Technische Universität München

  11. Considerations Technische Universität München • Calculatedvolumesareintendedtoactasgeneraloverview/orientation • Range oftreespeciesmightdifferfrom rural areas • Groundtruthingtovalidate • Methodisapplicabletoeachcasestudycitywith an UMT mappingand LC-analysis • Single treesgrow different comparedtotrees in foreststands • Forestgrowthcalculationisdependantfromstandingvolumes • Can bethebasisforestimationofthebiomassandcarbonsequestration

  12. References Technische Universität München • Avery, T.E., Burkhart, H.E., 2002: ForestMeasurements, Fifth Edition; McGraw-Hill Series in Forest Resources • FAO 2010: Global Forest Resources Assessment 2010 – Main Report; FAOForestry Paper 163; Food andAgricultural Organisation ofthe United Nations, Rome • Lembcke, Knapp, Dittmar, 2000: Ertragstafel für die Kiefer (Pinussylvestris L.) im nordostdeutschen Tiefland; Landesforstanstalt Eberswald • West, P.W., 2004: TreeandForest Measurement; Springer-Verlag, Berlin • Zöhrer, F., 1980: Forstinventur, ein Leitfaden für Studium und Praxis; Pareys Studientexte 26; Verlag Paul Parey, Hamburg und Berlin

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