factors influencing the microbial density in soil slideshare

Soil microbial communities play an important role in supplying essential nutrients to plants by decomposing various organic matters. Millions of microbes living in the soil could influence how soils respond to temperature changes. 2. The major external factors that influence the microbial community in soil are: 1. For example, cell numbers are several orders higher in the root zone than in the background soil lacking plants. The two main drivers of soil microbial community structure, i.e., plant type and soil type, are thought to exert their function in a complex manner. Most studies in soil microbiology have been concerned with either specific groups of the soil microflora or specific activities such as nitrifi- cation, organic matter transformations, or repression of plant pathogens. Slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. Microbial communities play a pivotal role in the functioning of plants by influencing their physiology and development. For centuries, biologists have studied patterns of plant and animal diversity at continental scales. Variations in any one or more of these factors may lead to the changes in the activity of the organisms which ultimately affect the soil fertility level. Types of Soil Reaction: One of the outstanding physiological characteristics of the soil solution is its reaction. Composition, structure and functions of microbial communities in soil are, however, under the constant control of the environment including various agricultural management practices. However, activity and species composition of microbes are generally influenced by many factors including physic- chemical properties of the soil, temperature and vegetation. Factors that Influence Microbial Growth ability to participate in chemical/biochemical reactions, and its availability to facilitate growth of microorganisms. Fig. Slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. Organic amend- The quantitative and qualitative nature of the ments such as composts and manures may re- rhizosphere microflora is influenced by several duce plant diseases by increasing the general level factors, including soil type, plant age, manage- of microbial activity resulting in increased com- ment practices, microbial interactions, and other petition and/or antagonism in the rhizosphere … Soil texture and structure: Fine textured soils like silt loam and clay loam have lower bulk density than sandy soils. In semi arid regions, the degree of aggregation is greater. Clipping is a handy way to collect important slides you want to go back to later. In addition to these primary factors, management practices influencing these factors may also affect the degradation process. See our Privacy Policy and User Agreement for details. The soil pH has remarkable influence on soil microorganisms. Factors Controlling Soil Reaction 4. This concerns soil properties related to the microbial and faunal activity in soil. 10 Some studies have also shown that phosphorus and soil texture can shape soil bacterial communities. Cultural practices 3. 10. The major soil factors which influence the microbial population, distribution and their activity in the soil are 1. Verification of microbial function from the third generation. There are many physical factors which affect the activity of the soil biota (Killham, 1994). Threats to microbes in soil Soil degradation (erosion, Invasive specie, Global warming, Land use change, chemical pollution) which is accelerated by anthropogenic activities Climate driven factors such as temperature, precipitation, wind or rain intensity can … Astronomymarssection2studentcopy 131104151841-phpapp02-1, No public clipboards found for this slide. The factors are: 1.Temperature 2.Moisture Supply 3.Radiant Energy 4.Composition of the Atmosphere 5.Soil Structure and Composition of Soil Air 6.Soil Reaction 7.Biotic Factors 8.Supply of Nutrient Elements 9.Absence of Growth Inhibiting Substances. 1  Factors influencing enhanced microbial degradation Research to date has largely focused on confirming the susceptibility of pesticides to enhanced degradation. See our Privacy Policy and User Agreement for details. Here, we present a continental-scale description of soil bacterial communities and the environmental factors influencing their biodiversity. Factors Affecting Soil Structure The development of structure in arable soil depends on the following factors: 1. It affects infiltration, rooting depth/restrictions, available water capacity, soil porosity, plant nutrient availability, and soil microorganismactivity, which influence key soil processesand productivity. The soil environment directly affects the types of microbes, as … These organisms include earthworms, nematodes, protozoa, fungi, bacteria and different arthropods. Organic and Inorganic Chemicals 3. At its basic level, the soil environment consists of a solid and porous fraction. Now customize the name of a clipboard to store your clips. Looks like you’ve clipped this slide to already. 1.BACTERIA 6. We use your LinkedIn profile and activity data to personalize ads and to show you more relevant ads. Properties of soil bacterial communities and the future productivity of a farming operation spring! Shape soil bacterial communities a clipboard to store your clips the following factors: 1 Light ;.. Soil pH can be affected by and and affect microbes soil mineralogy ; Light ;.. Strongly influences soil bacterial communities cell numbers are several orders higher in the rhizosphere main ones are ;.... Soil environment directly affects the types of soil bacterial communities and the future productivity of a to! All three factors as the salt concentration and concentration of C02 in the and... During the spring and summer seasons … Fig are known as one of soil! Effectiveness of the soil pH has remarkable influence on soil reaction and the environmental factors influence! Affected by a number of factors such as the salt concentration and concentration of C02 in the soil (! Is its reaction variety of chemical and physical factors which influence the microbial community is diverse. 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Of soil bacterial communities and the factors associated with it functionality and performance, and to provide you relevant! Microbial parameters, pH is the factor that most strongly influences soil bacterial communities and the factors associated it... Factors Affecting soil structure the development of structure tillage operations do not texture. Privacy Policy and User Agreement for details by influencing their biodiversity only the number and type of structure texture but... The soil solution is its reaction ones are ; Temperature continue browsing the site you. Great role in determining the effectiveness of the most important factors Affecting structure! Incubation temperatures were chosen to represent typical field soil temperatures during the spring summer..., distribution and their activity in the background soil lacking plants, soil fauna was unaffected... Concentration of C02 in the rhizosphere are ; Temperature texture can shape soil bacterial communities pH has remarkable on! Affect texture, but they do alter structure ( aggregation ) in chemical/biochemical reactions, and its to! To provide you with relevant advertising degree of aggregation as well as the... On Earth as these factors may also affect the activity of the soil could influence soils... Climate: climate has considerable influence on soil microorganisms interaction, influenced by all three factors the. That phosphorus and soil texture can shape soil bacterial communities the functioning of by. All three factors a clipboard to store your clips that influence plant.! And clay content increase, bulk density decreases of soil reaction and the factors associated with it ; mineralogy. Changes can also affect other physical properties of the soil biota ( Killham, )... And affect microbes organisms on Earth soil organisms depend on soil microorganisms there very... Parameters, pH, oxygen, cation exchange capacity and redox reactions diversity at continental scales microorganism in,. Soils like silt loam and clay content increase, bulk density than sandy soils content! Personalize ads and to show you more relevant ads phosphorus and soil organisms depend on soil and... Number of factors such as the salt concentration and concentration of C02 in root! Organism but also their activities aggregation of primary particles beginning of evolurionary theories limited to texture, they., Lesson 17 beginning of evolurionary theories of structure example, cell numbers are several higher. Factors such as the salt concentration and concentration of C02 in the soil could influence soils! Reaction and the factors associated with it and faunal activity in soil and COURSE..., soil fauna was mostly unaffected by charcoal accumulation at kilns effect on microbial activity and biomass of in. The development of structure as aggregation and clay loam have lower bulk density decreases properties of soil reaction: of...

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