Copyright© Oktober 2019 AGRIKANAbstrak. Pengetahuan yang terbatas tentang sifat fisika kayu (kadar air dan jenis berat), sementara kayu sangat potensial dengan berbagai jenis dan memiliki karakter dan vareabilitas beragam maka sangat perlu diteliti sifat-sifat kayu, sehingga kita dapat mengetahui kemampuan kayu untuk penggunaannya menyangkut higrokofisitas (kemampuan) kayu menyerap dan menghilangkan air), kerapatan sehingga penggunaannya bisa dimanfaatkan secara lebih luas. Penelitian ini bertujuan untuk mengetahui tingkat penyerapan kadar air pada pohon jati dan sengon asal Tobelo Kabupaten Halmahera Utara. Hasil penelitian ini diharapkan: 1). Dapat memberikan data dan informasi ilmiah tentang penyerapan kadar dari kayu keras dan kayu lunak kepada dunia akademik, komunitas, pemerintah untuk menambah pengetahuan dan wawasan dalam pengelolaan. 2). Menjadi pedoman untuk menentukan jenis vegetasi yang memiliki tingkat penyerapan H2O yang tinggi untuk melakukan tindakan rehabilitasi di daerah yang sudah mengalami kerusakan. Hasil penelitian menunjukan bahwa nilai rata-rata kadar air pada kayu sengon bagian pangkal 38,485 %, tengah 36,412 % dan ujung 38,162 %. Pada kayu jati nilai rata-rata pada bagian pangkal 56.406 %, tengah 58,463 % dan ujung 51,045 %. Hasil penelitian menunjukan bahwa yang memberikan pengaruh nyata terhadap kandungan air yaitu jenis pohon dengan nilai sig sebesar 0,004 lebih kecil dibandingkan dengan α 0,05.Abstract. Limited knowledge about the properties possessed by wood is the physical properties of wood. While potential wood with various types and varying character and vareability, it is very necessary to examine the properties of wood so that we can find out the ability of wood for its use concerning the hygrokoficity of wood, density so that its use can be utilized in a wider way. This study aims to determine the level of absorption of water content of teak and sengon trees from Tobelo. The results of this study: 1). Can provide scientific data and information about the absorption water of teak wood and sengon to the academics, community, government to get knowledge and insight in the management of wood lately suffered damage due to various factors,. 2). Be a guideline to determine the type of vegetation that has a high H2O absorption rate of water to carry out rehabilitation measures in areas that have been damaged. The result showed that the average value of water conten in sengon wood at the base was 38,485%, middle 36,412%, and tip 38,161%. Teak wood the average value is at the base 56,406%, middle 58,463% and tip 51,045%. The result showed that the real effect on water content was the type of tree with a sig value of 0,004 smaller than α 0,05.

Binuang bini (Octomeles sumatrana Miq) is a fast-growing tree with numerous economic benefits, such as the provision of wood for carpentry purposes, building boards, water management, and absorption of carbon dioxide (CO2). Therefore, this tree species has great potential and needs to be included in Reducing Emission from Deforestation and Forest Degradation (REDD)+'s mitigation program to tackle climate change. In its development, REDD+ has made it possible to carry out carbon trading in the world. Therefore, countries capable of performing protective functions and carry out reforestation, afforestation, and restoration, have the opportunity to be involved in world carbon trading. This study aims to determine the moisture content and carbon absorption rate of Binuang bini trees as a first step to regulate the allometric equation using destructive and laboratory analysis. The results show that the water content in the roots, leaves, as well as the base, middle, and tip of the stem were: 73.69%, 68.39%, 65.59%, 61.22%, and 66.26%, respectively. Furthermore, the sample test results indicate a very close relationship between carbon concentration and absorbance in the O. sumatrana tree with a simple linear regression equation: Y = 0.002X + 0.0593 with R2 = 0.9896. Therefore, this regression equation can be used to calculate the carbon concentration sample for the O. sumatrana tree fraction. The carbon content in 3 tree samples with a breast height diameter of 9.24 cm, 10.08 cm, and 11.68 cm was 2,585 kg. 2,913 kg, and 4,654 kg, respectively. In addition, the carbon sequestration for each tree diameter per year is 1.581 kg year-1, 1,782 kg year-1and 2,847 kg year-1, respectively.