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Population and Diversity of Soil Microorganism in the South-north Hills in Lanzhou

Author: ZhaoZuo
Tutor: ZhangLiHua
School: Gansu Agricultural University
Course: Plant Nutrition
Keywords: Vegetation cover Site Type Microbial flora Quantity Dominant groups Diversity
CLC: S154.3
Type: Master's thesis
Year: 2010
Downloads: 90
Quote: 0
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Abstract


Application of soil microbiology research methods, Lanzhou northern and southern mountains five trees and shrubs woodland microbial flora characteristics special to community diversity and soil microbial physiological groups distribution law study, the results showed that: 1. Lanzhou of mountains in soil microbial quantity rich, and showed the following laws: 1) the total number of size for the four plots of soil microbial: Nanshan blue Shilin field (A) gt; Nanshan seven beams (B) gt; Kitayama Alex Hill after Hill (C) gt; Kitayama Laohutai ( D). 2) Lanzhou City of mountains in soil microbial flora consisting of: bacteria (× 107) gt; actinomycetes (× 105) gt; fungi (× 104). 2 different vegetation coverage, site type and season of Lanzhou of mountains in the quantity of microorganisms have varying degrees of impact, and showed the following rules: 1) in five different vegetation, the of Caragana microphylla soil fungal, bacterial highest number; while the red the sand soil actinomyces highest. 2) in different site types of soil, the South hillside soil fungi, bacteria and actinomyces were higher than the north hillside. 3) in different seasons, fall soil fungi, bacteria and actinomyces than spring soil. 4) soil fungi, bacteria and actinomycetes the topsoil number up, and decreases with the increase of soil depth. This research shows that different vegetation cover and site type on soil microbial community structure is mainly the dominant genus composed of: 1) Compare: Simpson (J) index of the average size of the soil fungal community structure diversity in different vegetation cover Sort soongorica gt; wolfberry gt; Tamarix gt; oriental arborvitae gt; Caragana, but did not change significantly. Shannon (H `) index by vegetation type; different slope in the South, North, South hillside of Simpson (J) index of the average size of the sort gt; Northern hillside, but did not change significantly, Shannon (H ') index by the Site Type the significant influence. 2) compare soil bacterial community structure diversity in different vegetation cover: Simpson (J) index is less subject to the influence of different vegetation, Shannon (H ') index by the great influence of the vegetation types; site type, Simpson ( index J), Shannon (H `) index by less affected. 3) community structure of soil actinomycetes diversity compared different vegetation cover: Simpson (J) index of the average size of the sort soongorica gt; oriental arborvitae gt; wolfberry gt; Caragana microphylla gt; Tamarix, Shannon (H `) Index types of vegetation cover. Different vegetation cover and site type of special soil microbial physiological groups affect: 1) the number of aerobic soil diazotrophs different vegetation performance: Caragana microphylla gt; Tamarix gt; soongorica gt; oriental arborvitae gt; wolfberry; the South hillside soil in aerobic Azotobacter over North hillside. 2) soil aerobic cellulose decomposing bacteria did not show significant differences due to changes in vegetation type, site type, the the South hillside north hillside soil gas cellulose decomposition bacteria count in the 10-20 cm and 20-30cm The soil was highly significant difference.

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