Perubahan Biomasa Mikrobia Karbon Tanah Dengan Penambahan Aneka Jenis Seresah Di Berbagai Lingkungan Agroforestri Pinus+Kopi

Octaviasari, Chintia Veni (2019) Perubahan Biomasa Mikrobia Karbon Tanah Dengan Penambahan Aneka Jenis Seresah Di Berbagai Lingkungan Agroforestri Pinus+Kopi. Sarjana thesis, Universitas Brawijaya.

Abstract

Salah satu upaya meningkatkan produksi kopi dalam sistem agroforestry kopi+pinus adalah dengan memangkas cabang dan ranting yang mati dari pohon penaungnya. Pemasukan seresah pangkasan pohon ke dalam tanah dapat memperbaiki kualitas tanah, yang secara biologi ditunjukkan dengan jumlah Biomasa Mikrobia Karbon yang meningkat. Namun demikian, masih belum banyak diketahui perbaikan Biomasa Mikrobia Karbon terjadi setelah penambahan seresah. Tujuan penelitian, untuk mengevaluasi perubahan Biomasa Mikrobia Karbon setelah penambahan berbagai jenis seresah di berbagai kondisi agroforestry kopi+pinus Percobaan dilakukan di UB Forest pada bulan April sampai dengan Juni, dimana pada penelitian dilakukan pada musim penghujan. Aplikasi perlakuan diatur menurut Rancangan Acak Kelompok (RAK). Ada 5 jenis seresah di permukaan tanah (standing litter) dimasukkan kedalam litterbag berukuran 30x25x2 cm3, adalah: seresah kopi, pinus, kopi+pinus, ranting pinus dan tumbuhan bawah yang dibandingkan dengan perlakuan tanpa penambahan seresah sebagai kontrol (permukaan tanah ditutup batu kerikil). Semua perlakuan seresah diletakkan di 4 lahan yang berbeda: (a) lahan kopi “low management” (LC) dengan pemangkasan cabang pohon, (b) LC tanpa pemangkasan, (c) lahan kopi “high management” (HC) dengan pemangkasan cabang pohon, dan HC tanpa pemangkasan dilakukan 3 kali pengamatan (0, 4, dan 12 minggu setelah aplikasi). Contoh tanah (permukaan) diambil dari bawah litterbag, dilanjutkan dengan pengukuran MBC (metode fumigasi-ekstraksi). Pengukuran setiap kombinasi perlakuan diulang sebanyak 3 kali. Kualitas (lignin, polifenol dan C-organik) dari masing-masing seresah diukur pada minggu ke-0 dan minggu ke-12. Kondisi suhu udara dan tanah, diamati setiap hari. Data yang diperoleh dianalisis menggunakan ANOVA taraf 5 % dari program Genstat versi 18th apabila terdapat pengaruh nyata diuji lanjut BNJ taraf 5 %. Biomasa Mikrobia Karbon dari semua jenis seresah dan kontrol yang diletakkan di plot LC tanpa pemangkasan mengalami kenaikan dari minggu ke-0, minggu ke-4 sampai minggu ke-12. Biomasa Mikrobia Karbon tertinggi terdapat pada plot LC tanpa pemangkasan dibawah litterbag tumbuhan bawah (1724 μg C g-1) sedangkan yang terendah berada di plot HC tanpa pemangkasan dibawah litterbag campuran sersesah pinus dan kopi (457 μg C g-1), yang masing – masing terdapat pada minggu ke-12. Berdasarkan uji regresi antara Biomasa Mikrobia Karbon dengan faktor eksternal didapatkan hasil bahwa intensitas cahaya dan berat isi memiliki hubungan yang kuat dengan nilai R2 = 0.1801 dan R2 = 0.2363 serta n = 24. Sementara, pada faktor internal didapatkan hasil bahwa Biomasaii Mikrobia Karbon berhubungan kuat dengan N Total dan Total C-organik dengan nilai R2 = 0.363 dan R2 = 0.3014 serta n = 24.

English Abstract

One of the way to increase the coffee production in the coffee+pine agroforestry system is to prune dead branches and twigs from the main tree. The entry of tree pruning litter into the soil can improve soil quality, which is biologically indicated by the increasing amount of Microbial Biomass Carbon. However, there still not much known of the Microbial Biomass Carbon improvement occurred after the addition of the litter. The purpose of the study is to evaluate the changes in Microbial Biomass Carbon after adding various types of litter in various conditions of coffee+pine agroforestry. The experiment was conducted at UB Forest in April to June, where the research was conducted in the rainy season. The treatment applications are arranged according to the Randomized Block Design (RBD). There are 5 types of litter on the ground level (standing litter) put in a 30x25x2 cm3 sized litterbag, there are: coffee, pine, coffe+pine, pine twigs and understory compared with the treatment without the addition of litter as a control (the soil surface covered with the gravel). All litter treatments were placed in 4 different fields; (a) coffee plantation “low management” (LC) by trimming tree branches, (b) without trimming LC, (c) coffee plantation “high management” (HC) by trimming the tree branches, and HC without trimming was carried out 3 times observation (0, 4 and 12 weeks after applications). Soil (surface) sample are taken from under the litterbag, followed by MBC measurements (fumigation-extraction method). The measurement of each treatment combination was repeated 3 times. The quality (lignin, polyphenols and C-organic) of each litter was measured at week 0 and week 12. The ai and soil temperature conditions, observed every day. The data obtained analyzed using ANOVA at the 5% level of the 18th version of the Genstaat program, if there is any real impact the the SRD (Smallest Real Difference) tested at the 5% level. Microbial Biomass Carbon from all types of litter and control placed in the LC plot without pruning increased from week 0, week 4 to week 12. The highest Microbial Biomass Carbon was found in the LC plot without pruning under the litter bag Understory (under vegetation) (1724 μg C g-1) while the lowest was in the HC plot without pruning under the litter bag of pine and coffee litter bags (457 μg C g-1), respectively - there are each in the 12th week. Based on the regression test between Microbial Biomass Carbon with external factors, the results show that light intensity and bulk density have the strength relationship with the value of R2 = 0.1801 and R2 = 0.22363 and n = 24. Meanwhile, the internal factors show that the presence of Microbial Biomass Carbon is strengthly related to total N and C-organic with the value of R2 = 0. 363 and R2 = 0. 3014 and n = 24.

Other obstract

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Item Type: Thesis (Sarjana)
Identification Number: SKR/FP/2019/922/052000935
Subjects: 600 Technology (Applied sciences) > 631 Specific techniques; apparatus, equipment materials > 631.4 Soil science > 631.46 Soil biology
Divisions: Fakultas Pertanian > Agroekoteknologi
Depositing User: Nur Cholis
Date Deposited: 10 Aug 2020 07:55
Last Modified: 25 Oct 2021 07:11
URI: http://repository.ub.ac.id/id/eprint/179131
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