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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| Format: | First cycle, G2E |
| Language: | Swedish Swedish |
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2017
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| Online Access: | https://stud.epsilon.slu.se/11049/ |
| _version_ | 1855571799114252288 |
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| author | Krüger Persson, Sanna |
| author_browse | Krüger Persson, Sanna |
| author_facet | Krüger Persson, Sanna |
| author_sort | Krüger Persson, Sanna |
| collection | Epsilon Archive for Student Projects |
| description | 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. |
| format | First cycle, G2E |
| id | RepoSLU11049 |
| institution | Swedish University of Agricultural Sciences |
| language | Swedish swe |
| publishDate | 2017 |
| publishDateSort | 2017 |
| record_format | eprints |
| spelling | RepoSLU110492017-09-20T11:53:57Z https://stud.epsilon.slu.se/11049/ Biotiska faktorers inverkan på markstrukturen Krüger Persson, Sanna Soil chemistry and physics Soil biology Soil fertility 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. Markstrukturen är en avgörande faktor gällande markens funktion, däribland utgör växtplats för rötter, påverkar cirkulationen av näringsämnen och gasutbytet samt bildar markorganismernas levnadsmiljö. Markstrukturen påverkar vilka organismer som lever i jorden samtidigt som organismerna påverkar markstrukturen. Sambandet mellan markstrukturen och markorganismer är ett komplext system där olika interaktioner leder till olika feedback loops. Olika markorganismer påverkar markstrukturen i olika stor utsträckning där maskar, svampar, bakterier har en direkt påverkan på markstrukturen medan hoppstjärtar, kvalster, nematoder och protozoer har en indirekt påverkan. Flertalet av markorganismerna utsöndrar extracellulära polymera substanser som kittar samman markpartiklar och bidrar till att bilda aggregat. Rötter skapar porer i marken genom deras framväxt och utsöndrar extracellulära substanser som bidrar till ökad aggregering av markpartiklar. Rötterna och förnan skapar ett energiflöde ner i marken som påverkar utformningen av näringsväven. Utformningen av näringsväven påverkar i sin tur markstrukturen och hur energin förs vidare i olika trofiska nivåer i marken. Kvalitén och mängden av det organiska materialet från rötterna och förnan påverkar vilka markorganismer som lever där, samt har inverkan på varaktigheten av aggregeringen av markpartiklar. Hur jorden brukas genom olika jordbruksmetoder är en viktig faktor i hur markstrukturen utformas och vilka organismer som lever där, framför allt hur jorden bearbetas och vilka grödor som odlas påverkar. Syftet med arbetet var att redogöra hur olika biotiska faktorer påverkar markstrukturen genom aggregering av markpartiklar. Arbetet utfördes som en litteraturstudie av den forskning som finns inom området samt belyser områden där det finns kunskapsluckor i nuläget. 2017-09-19 First cycle, G2E NonPeerReviewed application/pdf sv https://stud.epsilon.slu.se/11049/1/kruger-persson_s_170919-1.pdf Krüger Persson, Sanna, 2017. Biotiska faktorers inverkan på markstrukturen. First cycle, G2E. Uppsala: (NL, NJ) > Dept. of Soil and Environment <https://stud.epsilon.slu.se/view/divisions/OID-435.html> urn:nbn:se:slu:epsilon-s-7028 swe |
| spellingShingle | Soil chemistry and physics Soil biology Soil fertility Krüger Persson, Sanna Biotiska faktorers inverkan på markstrukturen |
| title | Biotiska faktorers inverkan på markstrukturen |
| title_full | Biotiska faktorers inverkan på markstrukturen |
| title_fullStr | Biotiska faktorers inverkan på markstrukturen |
| title_full_unstemmed | Biotiska faktorers inverkan på markstrukturen |
| title_short | Biotiska faktorers inverkan på markstrukturen |
| title_sort | biotiska faktorers inverkan på markstrukturen |
| topic | Soil chemistry and physics Soil biology Soil fertility |
| url | https://stud.epsilon.slu.se/11049/ https://stud.epsilon.slu.se/11049/ |