Kajian Aktivitas Mikroorganisme Tanah pada Berbagai Kelerengan dan Kedalaman Hutan Alam (Studi kasus di Taman Nasional Gunung Leuser, Seksi Besitang)

Abstract

The objectives of this research are to calculate the value of soil microorganism in slope zone and variation of soil depth class at natural forest ecosystem . The research was conducted in the Laboratory Of Soil Biology and Central Laboratory , Faculty of Agriculture , Univesity of North Sumatera , Medan . The method used is Factorial Complete Random with two factor compared . They are : Factor I , slope class ( V ) and Factor II : depth class ( D ) The result of this research is showing that the highest pH according to slope class is in 0-8 % about 5,80 and lowest pH is in 15-25 % about 5,37 . According to depth class , the highest pH is in 20-30 cm about 5,95 and the lowest is in 0 - 10 cm about 5,27 . The highest amount of soil microorganism according to slope class is in 0 - 8 % about 34,48 x 107 SPK / ml and the lowest is 15-25 % about 33,65 x 10 SPK / ml . According to slope class the highest amount of soil microorganism is in 0 - 10 cm about 47,17 x 107 SPK / ml and the lowest is 20 - 30 cm about 22,08 x 10 ' SPK / ml . The highest production of CO₂ ( respiration ) from soil microorganism based on depth class is in 0 - 8 % about 1,33 kg / day , while the lowest is in 15 - 25 % about 1,10 kg / day . According to depth class , the highest production of CO₂ ( respiration ) from soil microorganism is in 0 - 10 cm about 1,37 kg / day and the lowest is in 20-30 cm about 1,12 kg / hari . The highest organic substance based on slope class is in 0-8 % yaitu about 1,65 % while the lowest is in 8-15 % yaitu about 1,54 % . The highest organic substance based on depth class is in 0 - 10 cm about 2,40 % and the lowest is in 20-30 cm about 0,99 % .