i
ABSTRAK
Penelitian ini dilaksanakan di lahan gambut Perkebunan Kelapa Sawit PTPN IV Kebun Panai Jaya Provinsi Sumatera Utara dan bekerjasama dengan Pusat Penellitian Kelapa Sawit (PPKS). Adapun tujuan penelitian ini melakukan pengelolaan lahan gambut yang lestari dengan cara memanfaatkan limbah baja sebagai pupuk (amelioran) dan pengaturan tinggi muka air tanah. Pemberian amelioran bertujuan untuk meningkatkan kadar unsur hara di dalam tanah, sedangkan pengelolaan tinggi muka air tanah untuk mencegah terjadinya subsiden di lahan gambut. Dengan adanya penambahan amelioran dan pengaturan tinggi muka air tanah, Peneliti ingin mengevaluasi pengaruh sifat biologi tanah antara lain respirasi tanah, populasi fauna tanah, populasi fungi, populasi bakteri serta hubungannya dengan sifat fisik dan kimia antara lain (suhu, pH, Kadar Air, C/N).
Adapun metode pengambilan sampel yang digunakan adalah dengan cara Pit Fall Trap (untuk menjebak fauna permukaan tanah), Burlese Turgen (Untuk melihat fauna tanah yang aktif di dalam tanah) dan membuat lubang (untuk mendapatkan cacing). Metode yang mendapatkan fauna terbanyak yaitu dengan cara Pit Fall Trap. Hasil yang diperoleh dengan penambahan amelioran tidak mempengaruhi organisme tanah namun kedalaman muka air tanah berpengaruh nyata terhadap populasi fungi, bakteri dan fauna tanah. Sedangkan korelasi antara fauna tanah terhadap suhu, kadar air dan respirasi tanah (positif) sedangkan pH dan C/N (negatif). Korelasi populasi bakteri terhadap kadar air dan respirasi tanah( positif) sedangkan suhu, pH dan C/N (negatif). Korelasi fungi berkolerasi terhadap C/N (negatif) sedangkan suhu, kadar air, pH dan respirasi tanah (positif). Jumlah fauna yang banyak ditemukan adalah semut rangrang pada peringkat pertama dan cacing tanah di posisi kedua.
ii
ABSTRACT
This study was conducted in peat Oil Palm Plantation PTPN IV Kebun Panai Jaya province of North Sumatra and in cooperation with the Oil Palm Research Center (PPKS). The purpose of this study do sustainable peatland management by utilizing steel waste as fertilizer (ameliorant) and setting the ground water level. Giving ameliorant aims to increase levels of nutrients in the soil, while the management of groundwater levels to prevent subsidence in the peat. With the addition of ameliorant and settings groundwater levels, researchers wanted to evaluate the effect of soil biological properties of soil respiration among other things, the amount of soil fauna, population of fungi, bacteria and its relationship of physical and chemical properties among others (temperature, pH, Water content, C / N).
The sampling method used is by Pit Fall Trap (to trap fauna ground level), Burlese Turgen (To view the soil fauna are active in the soil) and make a hole (to get the worm). A method that gets the highest fauna is by way of the Pit Fall Trap. The results obtained with the addition of ameliorant not affect the organism of peat soil, but the depth of the ground water level significantly affect the amount of fungi, bacteri and soil fauna. While the correlation between soil fauna to temperature, moisture and soil respiration (positive) while the pH and C/N (negative). Correlation of bacterial populations on water content and soil respiration (positive) while the temperature, pH and C/N (negative). Correlation of bacterial populations on water content and soil respiration (positive) while the temperature, pH and C/N (negative). Correlation fungi correlated to the C/N (negative) while the temperature, moisture content, pH and soil respiration (positive). The amount of fauna that are found are weaver ants in the first rank and earthworms in the second position.
