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Gansu Agricultural University (2020)

Response of Soil Bacterial and Autotrophic Carbon Sequestration Microbial Diversity to Tillage Measures in Semi-arid Area of Loess Plateau

郭喜军;

Titre : Response of Soil Bacterial and Autotrophic Carbon Sequestration Microbial Diversity to Tillage Measures in Semi-arid Area of Loess Plateau

Auteur : 郭喜军;

Grade : Master’s Theses 2020

Université : Gansu Agricultural University

Résumé
Soil microorganisms play a large part in CO2 fixation.Autotrophic microorganisms are commonly distributed in soil and possess high potential for environmental adaptability and carbon sequestration.In 2019,traditional farming(T)and three forms of conservation tillage,namely no-till straw cover(NTS),no-till don’t cover(NT)and modern tillage straw digging(TS)of pea farmland soil carbon sequestration and emissions,were studied in this report,based on 2001 in Gansu district,in order to create a long-term experiment of various farming steps,Rubisco enzymes and their encoding genes(cbbL),the use of soil microbial sources of carbon and the effect of physical and chemical properties,such as rainfed soil bacteria and photosynthetic carbon microbial diversity measures to cultivate and get the results.The results show that:1.Compared to conventional tillage(T),conservation tillage significantly increased the content of organic carbon,total nitrogen and phosphorus available in the0-20 cm soil layer during the peas flowering season,the most important of which was non-tillage straw mulching(NTS).Straw mulching and tillage had major effects on soil organic carbon in the soil layer of 0-20 cm,and soil organic carbon content in the soil layer of 0-20 cm was NTS,>,TS,>,NT,>T.The NTS treatment’s soil organic carbon content increased by 26.2 percent compared to that of T treatment,and the carbon sequestration improved dramatically.2.Straw mulching significantly increased Rubisco’s enzyme activity in the 0-20cm soil layer but there was no significant tillage effect.Rubisco’s enzyme production in soil treated with NTS and TS increased by 63.4%and 95.2%,respectively,relative to conventional tillage(T),with no substantial difference between T and NT treatments.3.The carbon metabolic diversity of soil microorganisms has been defined by capacity utilization of the carbon source and the index of functional diversity.The amineTS>T>NT.4.Tillage interventions had a substantial effect on soil microbial population abundance in the 0-20 cm soil layer,and microbial species richness and diversity under NTS treatment was higher than in NT,TS,and T treatment.In NTS treatment,the bacterial population richness index

Mots clés : Tillage practices; The carbon cycle; BIOLOG; Carbon sequestration microorganisms; CbbL genes;

Présentation (CNKI)

Page publiée le 4 novembre 2020