EFFECT OF THE SOIL PROTECTION SHEET AND THE BAG MATERIAL ON THE SOIL MICROORGANISM AND THE INDIGENOUS ARBUSCULAR MYCORRHIZAL FUNGI IN THE VOLCANIC DEVASTATED SITE IN MT.BATUR, BALI, INDONESIA

ABSTRACT In the volcanic devastated site of Mt. Batur located in the north eastern part of Bali, Indonesia, the test construction with the soil protection sheet and the bag material for the prevention of soil erosion and the revegetation had been executed in December, 2012 and the effect has been verified by now. In this study, the effect of the sheet on the soil microorganisms was investigated and the effect of the indigenous arbuscular mycorrhizal fungi, which had been put into the bag material with 3 kinds of woody plant seeds, on the vegetation was verified. As a result, after 2 years and 8 months from the construction, it was showed that the soil microorganisms under the sheet without the plant increased 2 to 2.4 times more than those in the bare site without the plant. Furthermore, those soil microorganisms under the sheet with the plant increased 8.4 to 8.9 times more than those in the bare site without the plant. It is considered that the cutting fragments in the length of about 5cm of the gramineous plant root existed near the construction site put into the bag material with the woody plant seeds contributed to the colonization of the arbuscular mycorrhizal fungi into the roots of seedlings from the seeds and the survival of the seedlings from the seeds as the inocula of the fungi. Keyword: Revegetation, mycorrhizal fungi, protection sheet