Fluks Metana dan Karakteristik Tanah pada Beberapa Macam Sistem Budidaya

, Suprihati; Iswandi Anas; Supiandi Sabiham; Gunawan Djajakirana

doi:10.24831/jai.v34i3.1299

, Suprihati Mahasiswa Sekolah Pascasarjana IPB, Bogor. Staf Pengajar Fakultas Pertanian, Universitas Kristen Satya Wacana
Iswandi Anas Staf Pengajar Departemen Ilmu Tanah dan Sumberdaya Lahan, Fakultas Pertanian, Institut Pertanian Bogor
Supiandi Sabiham Staf Pengajar Departemen Ilmu Tanah dan Sumberdaya Lahan, Fakultas Pertanian, Institut Pertanian Bogor
Gunawan Djajakirana Staf Pengajar Departemen Geofisika dan Meteorologi, Fakultas Matematika dan Ilmu Pengetahuan Alam, Institut Pertanian Bogor

DOI: https://doi.org/10.24831/jai.v34i3.1299

Abstract

Methane (CH₄) is an important greenhouse gas that has a high heat trapping capacity thus potentially contribute to the global-warming. Agriculture is considered among the responsible emission sources of CH₄. Relationship among soil characteristics, soil microbes, and CH₄ flux is very important in understanding the mechanism involved in the mitigation effects of certain agriculture practices. Results of this research showed that rice field produced the highest CH₄ flux (7.4976 ± 0.5299 mg CH₄-C m^-2 h^-1, n=3), while vegetable, sweet potato, yam bean and corn cropping produced lower CH₄ flux (-0.7708 ± 0.6434 to 0.4605 ± 0.5255 mg CH₄-C m^-2 h^-1, n=3). Nitrifier population among cropping systems was 3.13x10³ to 3.17x10⁴ MPN g^-1 soil (dry weight), while denitrifier population was 3.77x10³ to 1.17x10⁵MPN g^-1 soil (dry weight). There were no specific dominance proportion of nitrosomonas, nitrobacter, denitrifier and total propagule among cropping systems. The CH₄ flux had highly correlation to soil water content (r = 0.951), soil pH (r = 0.852) and soil Eh (r = -0.982). Denitrifier had significantly correlation to soil pH (r = -0.635) and soil ammonium content (r = -0.681).

Key words : CH₄ flux, cropping system, soil characteristic, soil microbes