Judul: Biomass and Carbon Storage Estimation in Forest Areas with Special Management Sarongge
Abstrak: Hutan memiliki peran sangat penting dalam hal pemanasan global. Hutan sebagai penyerap alami dapat membantu mengurangi karbondioksida di atmosfer dan membantu memerangi perubahan iklim. Penelitian ini bertujuan menduga biomassa/simpanan karbon tegakan di atas permukaan tanah dan menentukan tingkat ketelitian pendugaan menggunakan metode tanpa dan dengan stratifikasi di KHDPK Sarongge, Kabupaten Cianjur.Metode penarikan contoh dalam pendugaan biomassa dan simpanan karbon di atas permukaan tanah menggunakan simple dan stratified systematic sampling with random start. Plot contoh sebanyak 54 buah berupa lingkaran (seluas 0,04 ha) dipilih secara sistematis berjarak 69 m. Hasil pendugaan dengan stratifikasi memiliki sampling error lebih kecil dibandingkan tanpa stratifikasi, sehingga nilai dugaan biomassa dan simpanan karbon di atas permukaan tanah di KHDPK Sarongge sebesar 1.519 ton/ha dan 727,59 ton/ha., Forests play a vital role in global warming. Forests, as natural absorbers, can help reduce carbon dioxide in the atmosphere and fight climate change. The study aims to assume biomass and carbon storage stagnation on the surface of the soil and determine the severity of the assumption using methods without and with stratification in Sarongge, Cianjur district. Examples include biomass assumption and carbon storage over the soil surface using simple and stratified systematic sampling with a random start. Plot samples consisting of 54 pieces, forming circles over 0.04 ha, are systematically selected at distances of 69 m. Assumption results with stratification have smaller sampling errors compared to without stratification, so the assumptions of biomass and carbon stockpiling over land surface in KHDPK Sarongge are 1.519 tons/ha and 727,59 tons/ha.
Keyword: agroforestry, biomass, carbon storage, clutch, KHDPK

Judul: Estimation of Biomass and CO2 Uptake of the Upper Stand of Community Forest Stands in Cimanggu Village, Cikembar District, Sukabumi Regency
Abstrak: Keberadaan hutan rakyat dapat dijadikan sebagai alternatif untuk meningkatkan serapan CO2 di atmosfer, melihat saat ini terjadi penurunan udara karena kurangnya sumber serapan alami. Tujuan penelitian ini adalah untuk mengetahui informasi mengenai besarnya dugaan biomassa, cadangan karbon, dan serapan CO2. Metode yang digunakan dalam pengambilan data pada setiap responden menggunakan sensus, sedangkan penentuan lokasi dan penentuan responden dipilih secara purposive sebanyak 36 responden berdasarkan luasannya di 4 dusun. Kandungan biomassa diduga menggunakan rumus persamaan allometrik dan metode konversi volume dengan menggunakan BEF. Hasil penelitian menunjukkan total dan rata-rata simpanan dugaan biomassa sebesar 179,22 ton dan 11,908 ton/ha. Total dan rata-rata stok karbon per satuan luas adalah 205,225 ton/ha dan 5,701 ton/ha, sedangkan dugaan serapan sebesar CO2 753,176 ton/ha dan 20,922 ton/ha. Dusun yang memiliki total dan rata-rata serapan CO2 terbesar adalah Dusun Cikembang sebanyak 333,723 ton/ha dan 37,08 ton/ha., The existence of community forests can be used as an alternative to increase CO2 absorption in the atmosphere, seeing that currently there is a decrease in air due to a lack of natural sources of absorption. The purpose of this study was to find out information about the magnitude of the estimated biomass, carbon stocks, and CO2 absorption. The method used in collecting data on each respondent was using a census, while determining the location and determining the respondents purposively selected as many as 36 respondents based on their area in 4 hamlets. Biomass content was estimated using the allometric equation formula and the volume conversion method using BEF. The results showed that the total and average estimated biomass savings were 179.22 tons and 11.908 tons/ha. The total and average carbon stocks per unit area are 205.225 tons/ha and 5.701 tons/ha, while the estimated CO2 absorption is 753.176 tons/ha and 20.922 tons/ha. The hamlets that have the largest total and average CO2 absorption are Cikembang Hamlet with 333.723 tons/ha and 37.08 tons/ha.
Keyword: biomass, carbon, community forest, CO2 absorption

Judul: Penentuan Nilai Eigen dan Vektor Eigen dari Matriks Tridiagonal 2-Toeplitz dengan Pendekatan Polinomial Chebyshev
Abstrak: The eigenvalues and eigenvectors of a matrix can be determined by finding its characteristic polynomials. The characteristic polynomials of a tridiagonal 2-Toeplitz matrix is shown to be closely connected to polynomials which satisfy the Chebyshev recurrence relationship. If the order of the matrix is odd, then the eigenvalues are found explicitly in terms of the Chebyshev zeros and the eigenvectors are found in terms of the polynomials satisfying the recurrence relationship. For even ordered matrices, the situation is more complicated. The problem in these cases is that although the Chebyshev recurrence formula is still applied, its initial values are not generating Chebyshev polynomials
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