Abstract. Srau M, Bawole R, Marwa J, Sinery AS, Cabuy RL. 2022. Diversity, composition, structure and canopy cover of mangrove trees in six locations along Bintuni riverbank, Bintuni Bay, West Papua, Indonesia. Biodiversitas 23: 5835-5843. Mangroves provide various benefits of ecological and socio-economic aspects. Such benefits could be delivered if mangrove vegetation is in good condition, indicated by several ecological parameters. This study was conducted to investigate the diversity, composition, structure, and canopy cover of mangrove trees along Bintuni riverbank, Bintuni Bay, West Papua, Indonesia. There were six different locations representing biotic and abiotic conditions. The study only focused on the mangrove tree stage with a total of 175 plots established, of which each plot had a size of 10 × 10 m. The name of mangrove species, tree diameter, total height, and canopy cover percentage was recorded and measured. The result showed that the diversity and composition of mangrove trees varied among the six locations indicated by the importance value index (IVI) parameter. The estuary and sub-estuary areas were dominated by Rhizophora mucronata, while in the further area from the estuary toward the land, the dominant mangrove species was Avicennia sp. The highest number of mangrove trees was found in Kampung Lama 1 with 989 trees/ha (593 trees in 60 plots) with an average diameter of 18.8077 cm (SD±7.0279) and an average height of 8.9477 m (SD±2.2814). The lowest tree distribution was found in Kampung Masuhi with 940 trees/ha (94 trees in 10 plots) with an average diameter of 15.4787 m (SD±3.8205). The highest average of canopy covers was noted in the sub-river estuary with a percentage of 86.97% (SD±85) and the lowest percentage was in Kampung Masina with 59.89% (SD±124.85). Statistical analysis of variance (ANOVA) showed that there was a significant difference in terms of average tree diameter and height among the six locations with a p-value of 0.00021 < 0.05 at 95% CI. There was a strong positive correlation between tree diameter and height, as indicated by R2 of 0.69. In addition, a statistical test of analysis of variance from each location was significantly different among these six locations.

Penelitian ini bertujuan untuk mengetahui aktivitas penduduk di sekitar areal hutan mangrove serta mengetahui luas kawasan mangrove yang telah rusak akibat aktivitas antropogenik di wilayah Airtiba, Kelurahan Krooy Kabupaten Kaimana. Metode yang digunakan dalam penelitian ini adalah metode deskriptif dengan teknik survei lapangan. Berdasarkan hasil penelitian diketahui terdapat enam indikasi penyebab kerusakan yaitu aktivitas penebangan untuk kayu bakar dan tambelo, perluasan areal permukiman, konversi lahan untuk tempat pengeringan ikan, tempat pembuangan sampah, perluasan tubuh air guna akses perahu dan area pertambakan di sekitar kawasan hutan mangrove Airtiba. Intensitas kerusakan terbesar disebabkan oleh aktivitas pertambakan sedangkan yang intensitas kerusakan terkecil disebabkan oleh aktivitas pembuangan sampah. Perhitungan IK menunjukkan kerusakan sebesar 8,60% atau 20,31 ha dari total luas kawasan sebesar 236,13 ha yang mana masih dalam kategori intensitas kerusakan rendah.

This study identifies the benefits that traditional communities receive from the tropical rain forest in New Guinea, Indonesia. In this study, various benefit sharing schema developed by forest concession holder are assessed to understand the precise outcome compared to traditional welfare solutions. It further aims to identify benefit sharing schemas applied by concession investors in the forest sector and assesses these schema based on equitable principles. A questionnaire and semi‑structured interviews were used to collect data from traditional communities, concession holders, and the government. Interviews and field observations were randomly conducted and then analyzed for both quantitative and qualitative descriptions. The results indicate that there were five benefits sharing schemas i.e., those based on financial schema, based on the market, based on infrastructure, based on social management, and based on the transfer of knowledge and technology. Overall, all the schemas that were developed did not fulfil the same criteria. However, there were only two schemas that were considered to be equal and efficient: the financial based‑schema and infrastructure based‑schema. This is indicated by the larger number of criteria and requirements that they fulfil. Yet, all the schemas still present various conflicts either between customary communities and the government or between the communities and investors.

Penelitian ini dilakukan dengan tujuan untuk memperoleh informasi terkini terkait perubahan kawasan hutan alam pada hutan Pendidikan Anggori Maokwari. Dalam kajian ini, pengumpulan informasi terkait bentuk kerusakan hutan dilakukan melalui kegiatan tracking dan mengidentifikasi bentuk-bentuk kerusakan yang diakibatkan menjadi penting untuk diketahui. Selain itu diskusi dan wawancara semi structural juga dilakukan guna memperoleh persepsi dan pandangan sosial masyarakat terkait interaksinya dengan hutan alam. Dari hasil penelitian diperoleh informasi bahwa telah terjadi perubahan kepada kawasan hutan alam dengan beberapa penyebab aktivitas antara lain: 1) aktivitas berkebun, 2) aktivitas pembukaan rencana lokasi wisata, 3) aktivitas penebangan untuk memperoleh kayu konstruksi dan kayu bakar, serta 4) aktivitas pembukaan jalan guna akses penduduk. Hasil analisis intensitas kerusakan diperoleh bahwa kerusakan yang terjadi masih cukup kecil dengan intensitas sebesar 9,685% atau sekitar 7,942 Ha dari total luasan yang ada.

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