Biotiska faktorers inverkan på markstrukturen
Soil structure is a key factor in the functioning of soil, including its ability to support root growth. Soil structure influences the circulation of nutrients and affects the gas exchange, and acts as habitat for the soil organisms. Soil structure influences which organisms that live in the soil...
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| Formato: | First cycle, G2E |
| Lenguaje: | sueco sueco |
| Publicado: |
2017
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| Materias: | |
| Acceso en línea: | https://stud.epsilon.slu.se/11049/ |
| Sumario: | Soil structure is a key factor in the functioning of soil, including its ability to support
root growth. Soil structure influences the circulation of nutrients and affects the
gas exchange, and acts as habitat for the soil organisms. Soil structure influences
which organisms that live in the soil, at the same time as the soil organisms affects
the soil structure. The relationship between the soil structure and the soil organisms
is a complex system where different interactions lead to feedback loops. Different
soil organisms affect the soil structure in different ways. Earthworms, fungi and bacteria
affect soil structure directly while collembola, mites, nematodes and protozoa
have an indirect impact on the soil structure. Some of the soil organisms exudate
extracellular polymeric substances that bind together soil particles and form aggregates.
Roots create pores in the soil through their growth and contribute to the formation
of aggregates by their exudates of extracellular substances. Roots and litter
constitute an energy input into the soil that influence and shape the soil food web,
which in turn influences the soil structure and feeds back on how the energy flows
throw the soil. The quality and amount of organic matter from the roots and litter
affect which organisms that live in the soil, and influence the durability of aggregation
of soil particles. Soil management, in particular soil tillage and crop selection,
have a large impact on soil structure and the organisms that live in the soil.
The aim of this essay was to review how different biotic factors influence soil
structure through aggregation of soil particles. This was performed through a literature
study of the research that was available on the subject. The essay also and illuminates
where more research is needed. |
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