Microbes Population and Soil Respiration Under The Kemenyan (Styrax spp) Stand Rhizosphere
Abstract
The rhizosphere defined as zone surrounds the root that it physical, chemical, and biological character directly influenced by root activities. The rhizosphere is characterized by high microbiological activities compared to bulk soil and affected the plant performance. The objectives of this research were to determine soil respiration and total population of soil microbes, including fungi and bacteria, phosphate solubilizing microbes, and organic matter decomposer microbes. Soil samples were collected from rhizosphere zone (0-20 cm) of kemenyan bunga, kemenyan durame, kemenyan batak and kemenyan minyak in Pardomuan village, Sitellu Urang Julu-Pakpak Bharat, North Sumatera. Microbial population was calculated using plate count method and soil respiration measured using jar methods. The result showed that the highest fungi and bacterial population were found under kemenyan durame rhizosphere those were 13.4 x 107 and 15.7 x107 CFU mL−1. The highest phosphate solubilizing microbes population (96.8 x104 CFU mL−1) was also found in kemenyan jurame rhizosphere. The highest organic matter decomposer microbe found in kemenyan minyak rhizosphere those were 25.1 x104 (fungi) and 73.2 x 104 CFU mL−1 (bacteria). The highest respiration (3.23 mg CO2 100 g−1 day−1) was also found in kemenyan jurame rhizosphere.
Keywords: bacteria, fungi, kemenyan, respiration, rhizosphere
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