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Forest Carbon Inventory in Proposed Central Suau REDD+ Area, Milne Bay Province, Papua New Guinea

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Forest Carbon Inventory in Proposed Central Suau REDD+ Area, Milne Bay Province, Papua New Guinea INTERNATIONAL CLIMATE INITIATIVE Regional project Climate Protection through Forest Conservation in Pacific Island Countries Forest Carbon Inventory In Proposed Central Suau REDD+ Area, Milne Bay Province, Papua New Guinea. Forest Carbon Inventory in Proposed Central Suau REDD+ Area, Milne Bay Province, Papua New Guinea. December 2014 Prepared by: On behalf of: SPC/GIZ Regional Project ‘Climate Protection through Forest Conservation in Pacific Island Countries’ P.O. Box 14041, SUVA, Fiji Email: [email protected] 2 SPC/GIZ Regional REDD+ Project Executive summary The present report provides an overview on the methodology, results and discussion of the forest carbon inventory in Central Suau in Milne Bay province, Papua New Guinea conducted by Österreichische Bundesforste AG. The report is the deliverable 3 in the project “Project Design Document Development for Forest Carbon Project (Logged – Protected Forest) in Central Suau” financed by the Gesellschaft für Internationale Zusammenarbeit (GIZ) and supported by the Secretariat of the Pacific Community (SPC). The project is developed in close cooperation with the Papua New Guinea Forest Authority (PNGFA). The primary forest in the Central Suau Preliminary Project Area (PPA), located in Milne Bay Province, Papua New Guinea, defines the actual Project Area, as it is subject to conventional logging under a Forest Management Agreement (FMA) as planned by PNGFA. The PPA consists predominantly of hills and mountains with steep ridges. The central mountain range reaches an altitude of 1253m at its peak. Small areas of low relief exist in the lowlands and river valleys, particularly near Leleafa in the west, Saga-aho near the Segei River and Modewa in the south east. The methodology employed followed state-of-the-art approaches in land cover analysis to derive the operable forest area in commercially attractive forest strata. Nested Permanent Sample Plots (PSP) have been established in a purposively set cluster sampling design across three forest strata. The forest inventory was carried out in the PPA in September and October 2014. 141 plots were measured in seven clusters. In addition to assessing carbon stocks, the forest inventory also estimated standing volume of commercial sawlogs. Commercial sawlogs are defined as logs with minimum DBH of 50cm and with log form meeting minimum form criteria for each log grade. Three log grades were identified, with Grades A and B assumed to be export grade and Grade C suitable for domestic market only. The results of the land cover analysis show eleven land cover strata including three assessed to hold commercial sawlog stocks. These three land cover strata cover 43,374ha or 72.6% of Central Suau PPA area of 59,758ha. The dominant commercial forest strata is “Low Altitude Forest on Uplands < 550m altitude” (Hma), which covers 32,455ha or 75% of the production forest area. Of the total commercial forest area, 22,447ha (51.8%) is considered operable. The reminder is considered too steep for ground based logging operations (Hmb). As the Hmb strata is almost all located on steep land, the final operable area is dominated by the Hma strata. The results of the inventory indicate an average carbon stock in Aboveground Biomass of ~150 tons per ha across the three land cover strata sampled. In total, the carbon stock amounts to 6.2 million tons carbon across the commercial forest area of 43,374ha. The average sawlog stock constitute 42.0m3 net recoverable volume per ha across the three land cover strata sampled or 1.8 million m3 in total. Of this, 81% is considered suitable for export (Grade A and B). Poor weather conditions reduced the available time for plot measurement. As a result of this as well as several occurrences of landowner permission issues, most of the clusters were not completed to the target of 24 plots per cluster. Consideration should be given to completing the clusters during the next re-measurement, along with the establishment of the Cluster planned at point 4 (Silosilo), for which permission was withdrawn at the last minute. During the field work it became clear that there was a lack of information on the planned REDD+ project at the individual land owner level. Additional input is required to improve awareness at the grass roots level to ensure a smooth monitoring at PSPs in the future as required by VCS. This report will be used as an input into the preparation of the Project Description under VCS. The next steps to be taken comprehend the preparation of the indicative logging plan and the calculation of carbon emissions from logs harvested and associated harvest operations such as road construction, felling and extraction, transport to market, and other related support activities. 2 SPC/GIZ Regional REDD+ Project Contents Executive summary .................................................................................................................................... 2 Contents ....................................................................................................................................................... 2 Abbreviations ............................................................................................................................................... 2 1 Background ......................................................................................................................................... 2 2 General Description of Project Area .................................................................................................. 3 2.1 Location and Size ........................................................................................................................ 3 2.2 General Physical Characteristics from PNGRIS Dataset .............................................................. 4 2.3 Topography and Hydrology ......................................................................................................... 5 2.4 Accessibility ................................................................................................................................. 5 3 Methodology ........................................................................................................................................ 6 3.1 Overview ..................................................................................................................................... 6 3.2 Land Cover Stratification ............................................................................................................. 6 3.3 Inventory ..................................................................................................................................... 9 3.4 Tree Height Estimation ............................................................................................................. 12 3.5 Estimation of Carbon Stock ...................................................................................................... 12 4 Area Statement................................................................................................................................... 15 4.1 Area by Land Cover Strata. ........................................................................................................ 15 4.2 Slope Class Analysis ................................................................................................................... 16 4.3 Elevation Class Analysis ............................................................................................................ 17 4.4 Delineation of Steep Land Areas ................................................................................................ 18 5 Inventory Results ............................................................................................................................... 20 5.1 Clusters and Plots Measured ...................................................................................................... 20 5.2 Estimate of Total Carbon Stock and Stock per Hectare by Land Cover Strata ........................... 21 5.3 Estimate of Total Sawlog Volume and Volume per Ha by Land Cover Strata ............................ 21 6 Discussion and Conclusions ............................................................................................................ 23 7 Materials Delivered ........................................................................................................................... 24 References ................................................................................................................................................. 25 Annex 1: Data Sources .............................................................................................................................. 26 Annex 2 Definition of Land Cover Strata on Milne Bay Forest Base Map 2012 .............................. 27 Annex 3 Field Measurement Procedure ............................................................................................. 29 Annex 4 Plot Tallysheet Forms ........................................................................................................... 33 Annex 5 Cluster and Plot List and Plot Layout Maps ....................................................................... 36 Annex 6 Species List ............................................................................................................................ 43 Annex 7 Detailed Results ...................................................................................................................
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