Perubahan Stok Karbon Tanah Hutan Yang Dikonversi Menjadi Lahan Budidaya Pertanian Di Siosar Kabupaten Karo
DOI:
https://doi.org/10.29103/agrium.v21i1.15688Keywords:
C-organik, budidaya, sifat-sifat tanahAbstract
Stok karbon tanah (SKT) berhubungan dengan kualitas tanah dan perubahan iklim global. Konversi lahan hutan diperkirakan dapat mengubah sifat-sifat tanah dan jumlah SKT. Penelitian ini bertujuan untuk menentukan perubahan sifat-sifat tanah dan SKT pada lahan Garapan pertanian. Sebanyak enam belas contoh tanah (utuh dan terganggu) telah diambil dari setiap lapisan pada empat minipit. Setiap minipit terdiri dari empat lapisan, dimana setiap lapisan memiliki ketebalan 20 cm. Hasil penelitian menunjukkan bahwa tekstur tanah semua tipe penggunaan lahan berlempung, bulk density (BD) dari rendah hingga sedang, nilai BD sedang dijumpai pada lahan hutan. Nilai pH tanah dari sangat masam hingga masam, nilai sangat masam ditemukan pada lahan hutan, sementara kapasitas tukar kation (KTK) bervariasi dari rendah sampai sangat tinggi, nilai KTK sangat tinggi terdapat pada lahan hutan. Jumlah kandungan C-organik dari rendah hingga sangat tinggi, kandungan C-organik sangat tinggi juga dijumpai pada lahan hutan. Stok karbon tanah yang ditemukan berkisar 73,84 hingga 130,17 MgC.ha-1, jumlah SKT tertinggi terdapat pada lahan hutan. SKT lahan hutan telah berubah manakala dikonversi menjadi lahan pertanian.
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