Forest Resource Assessment
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Forest Resources Assessment and Tools to Provide Information for Forest Ecosystem Management Imprint As a federally owned enterprise, GIZ supports the German Government in achieving its objectives in the field of international cooperation for sustainable development. Published by: Deutsche Gesellschaft für Internationale Zusammenarbeit (GIZ) GmbH Registered offices Bonn and Eschborn 4th Floor Forest Management Bureau Annex Building Department of Environment and Natural Resources Compound Visayas Avenue, Diliman, Quezon City 1101, Philippines T +63 2 697 3127 Programmes: National REDD+ System Philippines Project Forest and Climate Protection in Panay – Phase II Authors: Ralph Lennertz, Jürgen Schade and Vincent Barrois, DFS Deutsche Forstservice GmbH Photo credits/sources: Ralph Lennertz URL links: This publication contains links to external websites. Responsibility for the content of the listed external sites always lies with their respective publishers. When the links to these sites were first posted, GIZ checked the third- party content to establish whether it could give rise to civil or criminal liability. However, the constant review of the links to external sitescannot reasonably be expected without concrete indication of a violation of rights. If GIZ itself becomes aware or is notified by a third party that an external site it has provided a link to gives rise to civil or criminal liability, it will remove the link to this site immediately. GIZ expressly dissociates itself from such content. Maps: The maps printed here are intended only for information purposes and in no way constitute recognition under international law of boundaries and territories. GIZ accepts no responsibility for these maps being entirely up to date, correct or complete. All liability for any damage, direct or indirect, resulting from their use is excluded. On behalf of the German Federal Ministry for the Environment, Nature Conservation, Building and Nuclear Safety (BMUB) GIZ is responsible for the content of this publication. Printing and distribution: GIZ, Quezon City Quezon City, Philippines | 2017 Table of Contents List of Tables ........................................................................................................................................... 1 List of Figures .......................................................................................................................................... 2 List of Boxes ............................................................................................................................................ 3 Acronyms ................................................................................................................................................ 4 1. Introduction and background .............................................................................................................. 6 2. Objectives and definitions ................................................................................................................... 9 2.1 Objectives .................................................................................................................................. 9 2.2 Areal sampling frame .............................................................................................................. 11 2.3 Scope and content .................................................................................................................. 12 2.4 Variables of interest ................................................................................................................. 12 2.5 Targeted precision ................................................................................................................... 13 2.6 Definition of terms and concepts ............................................................................................. 14 2.6.1 Forest ......................................................................................................................... 14 2.6.2 Species abundance and diversity .............................................................................. 14 2.6.3 Carbon pools .............................................................................................................. 14 2.6.4 IPCC Key Categories and Tiers ................................................................................. 16 2.6.5 Forest sampling-related terms ................................................................................... 16 3. Inventory design ................................................................................................................................ 18 3.1 Sources of information ............................................................................................................ 18 3.1.1 Geographical-political subdivisions ............................................................................ 18 3.1.2 Forest strata and areas .............................................................................................. 18 3.1.3 Soil classes ................................................................................................................ 20 3.1.4 Wood specific gravity ................................................................................................. 22 3.2 Inventory Method ..................................................................................................................... 22 3.3 Sampling unit design ............................................................................................................... 22 3.3.1 Observations and measurements at the sample points ............................................. 24 3.3.2 Observations and measurements in the nested plots ................................................ 24 3.4 Sample size and margin of error ............................................................................................. 26 3.5 Sampling type and distribution ................................................................................................ 27 3.6 Human and material resources ............................................................................................... 29 3.7 Organization of field work ........................................................................................................ 29 3.8 Estimation design .................................................................................................................... 30 3.8.1 Merchantable volume of trees .................................................................................... 31 3.8.2 Above-ground biomass of trees ................................................................................. 31 3.8.3 Above-ground biomass of bamboos .......................................................................... 32 3.8.4 Above-ground biomass of palms ............................................................................... 32 3.8.5 Above-ground biomass of rattan and tree ferns ........................................................ 32 3.8.6 Below-ground biomass of trees, bamboos and palms ............................................... 33 3.8.7 Above-ground biomass of standing dead wood ......................................................... 33 3.8.8 Biomass of lying (downed) dead wood ...................................................................... 33 3.8.9 Biomass of litter .......................................................................................................... 33 3.8.10 Conversion of biomass to carbon ............................................................................ 34 3.8.11 Diversity indices ....................................................................................................... 34 3.8.12 Statistical inference .................................................................................................. 34 4. Field data collection .......................................................................................................................... 37 4.1 Getting to and marking of sample points ............................................................................ 37 4.1.1 Getting to the sample points ...................................................................................... 37 4.1.2 Location of sample points and plot centers................................................................ 38 4.1.3 Permanent marking of sample points and plot centers .............................................. 38 4.1.4 Inaccessible sample points and plot centers ............................................................. 39 4.2 Assessment or measurement of variables .............................................................................. 40 4.2.1 Administrative location ............................................................................................... 40 4.2.2 Actual coordinates ...................................................................................................... 40 4.2.3 Elevation..................................................................................................................... 40 4.2.4 Slope .......................................................................................................................... 40 4.2.5 Slope orientation ........................................................................................................ 40 4.2.6 Terrain .......................................................................................................................