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Effect of Long-term Fertilization on the Diversity and Community Structure of Arbuscular Mycorrhiza Fungi in Northwest China

Author: LiuJia
Tutor: FengHuYuan
School: Lanzhou University
Course: Botany
Keywords: Farmland ecosystem Fertilize Arbuscular mycorrhizal fungi (AMF) Community structure Species diversity
CLC: S154.3
Type: Master's thesis
Year: 2009
Downloads: 181
Quote: 0
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Abstract


Arbuscular mycorrhizal fungi (AMF) can form symbionts with plant roots, through some complicated way to change the structure and function of plant communities. The AMF diversity of great significance to the composition of the growth and development of plants and plant ecosystem, ecological studies on arbuscular mycorrhizal fungi in recent years has attracted the attention of scientists. Targeted to long-term (29 years) fertilization management Longdong rainfed wheat soil ecosystem, using traditional dyeing tablet, to study different fertilization system (nitrogen fertilizer, nitrogen and phosphorus fertilizer, straw, nitrogen and phosphorus, manure, manure nitrogen and phosphorus, no fertilizer control) the impact of diversity and community structure of soil arbuscular mycorrhizal fungi (AMF), the main results are as follows: AM infection and spore density. different fertilization treatments, it has a significant difference in the total infection rate spore density between 51.9% -76%, 19.7-27.3 / 20 g soil. Application of manure and nitrogen and phosphorus contribute to the infection of AM. Phosphate fertilizer applied to improve the density of spores in the soil. Rhizosphere soil AMF spores are also differences in the different soil depth plots of different fertilizer treatments. 1-30cm the soil spore obviously more than 30cm below the soil. N, NP, SNP, M processing 1-15cm and the spores no significant difference in the 15-30cm soil MNP treatment and control group CK increased with soil depth spore reduce the number. AM fungi species is different fertilizer treatments appears frequently, Glomus is the highest frequency. Long-term fertilization will affect AM fungal species is a distribution change AM fungal community structure and characteristics. Organic fertilizers and inorganic fertilizers and facilities can improve the species diversity of the AMF, single organic reducing species diversity of the AMF. Inorganic fertilizer is little effect on species diversity. Wheat production in the different treatment plots there are significant differences. Organic fertilizer and inorganic fertilizer application help to improve the role of product. Long-term fertilization led to increased soil N, P content, resulting in the change of soil fertility, which is one of the important causes of the change in wheat production. Soil spore density is closely related to the total phosphorus content and available phosphorus. Mycelial infection rate of soil organic carbon content. Wheat production was positively correlated with available phosphorus content, showed a significant negative correlation with the total infection rate was negatively correlated with arbuscular infection rate. The total infection rate is higher in plots with low crop yields, lower available phosphorus content of wheat increased in order to get more of phosphorous elements of arbuscular mycorrhizal fungi dependence, therefore low yield plots. Nitrogen can inhibit the growth of AMF, but this inhibition was only in the case of an adequate supply of plant phosphorus more significant. The study suggests that long-term fertilization treatments on arbuscular mycorrhizal colonization and AMF spore density, community structure and diversity of an impact, this impact can be either directly or can be indirect. Organic fertilizer and inorganic fertilizer application at the same time, more conducive to improving the yield and soil microbial activity than single organic or inorganic fertilizer.

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CLC: > Agricultural Sciences > Agriculture as the foundation of science > Soil > Soil Biology > Soil microbiology
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