Abstract
The study was conducted in Dukhula sadar and Gasabari forest range under Madhupur Sal Forest of Bangladesh to determine the soil nutrient composition and isolation of fungi with varying stands. Three stands viz. pure sal, plantation and mixed were considered as treatment of the study. A quadrate sample plot of 10×10 m2 size was measured to collect soil samples for both chemical analysis and fungi isolation. Soil pH, electrical conductivity, organic matter content, total N, available P, exchangeable K, available S, fungal abundance and colony character (cm) were determined to achieve the objective of the study. The results revealed that soil pH and electrical conductivity were highest (6.61 and 21.10?S/cm) in mixed stand and lowest (6.38 and 10.75?S/cm) in pure stand. Organic matter content and total N were highest (2.24 and 0.145%) in plantation stand and lowest (1.65 and 0.112%) in mixed and pure stand, respectively. Available P, exchangeable K and available S were highest (3.65, 98.66 and 17.53ppm) in pure stand and lowest (1.97, 79.49 and 10.25ppm) in plantation stand. In addition, four fungal genera Sclerotium, Rhizoctonia, Pythium and Verticillium were identified in the study area soils. The highest fungal population (entire genus except Verticillium) (colony number/g soil) was found in mixed stand while it was found lowest in pure (Sclerotium ) and plantation stand (Rhizoctonia and Pythium ). There was no significant variation in colony diameter of the fungi among the treatments. Therefore, it can be concluded that better soil health was maintained in natural forest rather than plantation forest.Res. Agric., Livest. Fish.2(1): 17-25, April 2015
Highlights
Every country has needs at least 25% of forest coverage of its total area for balance environmental condition
The highest (21.10μS/cm) soil electrical conductivity was measured in mixed stand which was statistically different to the electrical conductivity of pure stand and plantation stand
The lowest Electrical Conductivity (EC) was found in plantation stand (Table 1)
Summary
Every country has needs at least 25% of forest coverage of its total area for balance environmental condition. Plants uptake nutrients from the soil solution and incorporate them into biomass, which is returned to the soil through litterfall, root turnover, and tree mortality This biomass or organic matter is decomposed by soil organisms such as bacteria and fungi that excrete enzymes to breakdown organic molecules into smaller units, liberating nutrients and making them available to plants again (Chapin et al, 2002). This cycle regulates fluxes between individual nutrient pools, which vary in size and turnover rates
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