Estimasi Cadangan Karbon Pada Berbagai Penggunaan Lahan Di Das Rejoso, Pasuruan, Jawa Timur

Prasetiyo, Endro (2017) Estimasi Cadangan Karbon Pada Berbagai Penggunaan Lahan Di Das Rejoso, Pasuruan, Jawa Timur. Sarjana thesis, Universitas Brawijaya.

Abstract

Penggunaan lahan di Daerah Aliran Sungai (DAS) Rejoso terbagi atas berbagai macam peruntukan, yaitu: hutan alami 8,7 % dari total luas DAS (168,1 km2), kebun 17,7 %, ladang 43,7 %, pemukiman 4,3 %, sawah irigasi 7,8 %, dan semak belukar 17,6 %. Keanekaragaman managemen lahan yang terjadi di DAS Rejoso berpengaruh terhadap besarnya cadangan karbon di kawasan, namun demikian data tersebut belum banyak tersedia maka penelitian ini perlu dilakukan. Tujuan penelitian: 1) Mengestimasi cadangan karbon dari berbagai sistem penggunaan lahan (SPL) di DAS Rejoso, 2) Mengetahui hubungan kerapatan tutupan lahan dengan cadangan karbon yang tersimpan. Pengambilan data dilakukan dari bulan Februari - Maret 2016 di DAS Rejoso, Pasuruan. Rancangan yang digunakan adalah rancangan tersarang (Nested Sampling Design), dengan 5 SPL yang dipilih untuk pengamatan, yaitu: Agroforestri kompleks, Agroforestri sederhana, Monokultur timber, Monokultur nontimber, dan tanaman semusim yang terdapat di 3 zona yang mewakili lereng atas, tengah, dan bawah. Pengukuran cadangan karbon dilakukan dengan mengacu pada metode RaCSA (Rapid Carbon Stock Apprasial). Variabel yang diukur adalah biomassa pohon, tumbuhan bawah (understorey), seresah, nekromasa, BI, pH, tekstur, dan total C-organik. Hasil pengukuran menunjukkan bahwa cadangan karbon di berbagai SPL berkisar antara 6,5 Mg ha-1 hingga 132 Mg ha-1. Cadangan karbon terbesar terdapat di SPL monokuktur timber, sebesar 144 Mg ha-1, sedangkan di SPL non-timber hanya 68 Mg ha-1. Lahan agroforestri memiliki cadangan karbon rata-rata 53 Mg ha-1, cadangan karbon terendah terdapat pada SPL tanaman semusim rata-rata hanya 20 Mg ha-1. Biomassa pohon memberikan kontribusi C terbesar dibandingkan dengan komponen lainnya yakni 69%, sisanya adalah berasal dari understorey, seresah, akar dan nekromassa. Cadangan karbon di atas permukaan tanah memberikan kontribusi sekitar 75% dari total cadangan karbon dalam SPL, sedangkan sisanya adalah kontribusi tanah dan akar tanaman.

English Abstract

Land use in the Rejoso Watershed (DAS) is divided into various designations, are: natural forests 8.7% of total area of watershed (168.1 km2), 17.7% of home gardens, 43.7% cultivated land, 4.3% is settlement, 7.8% is irrigated rice fields, and 17.6% of shrubs. The diversity of land management that occurs in the Rejoso watershed may affects the amount of carbon stocks in the area, however the data is not widely available, therefore this research needs to be done. Research objectives: 1) To estimate carbon stocks from various land use systems (LUS) in Rejoso watershed, 2) To study the relationship between density of land cover and carbon stocks of LUS in the landscope. The data was collected from February - March 2016 in Rejoso Watershed, Pasuruan. The design used was Nested Sampling Design, with 5 LUS selected for observation, namely: Agroforestry complex, simple agroforestry, Timber Monoculture, Nontimber Monoculture, and seasonal crops contained in 3 zones representing the upper, middle, and under. Measurement of carbon stock is done by referring to RaCSA (Rapid Carbon Stock Apprasial) method. The variables measured were tree biomass, understorey, litter, nekromasa, soil BD, pH, texture, and total C-organic. The results showed that carbon stocks in various LUS ranged from 6.5 Mg ha-1 to 132 Mg ha-1. The largest carbon stock is found in LUS timber- monoculture of 144 Mg ha-1, whereas in LUS monoculture non-timber has carbon stock about 47% of than one in timber monocultur. Agroforestry system has an average carbon stock of 53 Mg ha-1, while the lowest carbon stock is found in LUS of seasonal crop averaging only 20 Mg ha-1. The tree biomass contributes the largest carbon compared to other components ie 69%, the rest is derived from understorey, litter, root and nekromassa. Above-ground carbon stocks contribute about 75% of total carbon stocks in the LUS, while the remainder is the contribution of soil and plant roots.

Item Type: Thesis (Sarjana)
Identification Number: SKR/FP/2017/895/051711112
Subjects: 600 Technology (Applied sciences) > 631 Specific techniques; apparatus, equipment materials > 631.4 Soil science > 631.47 Soil and land-use surveys
Divisions: Fakultas Pertanian > Ilmu Tanah
Depositing User: Yusuf Dwi N.
Date Deposited: 19 Dec 2017 01:22
Last Modified: 05 Oct 2020 11:25
URI: http://repository.ub.ac.id/id/eprint/7181
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