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黄土丘陵沟壑区地形变化对土壤微生物群落功能多样 性的影响
李超然1,2; 温仲明1,3; 李鸣雷1,3; 朱朵菊3; 曾鸿文4; 史海静3
Source Publication生态学报

化具有重要意义。选择陕西省安塞县陈家洼为研究区,依据坡面地形变化选择不同坡位土壤,采用Biolog 微平板培养法探究地
形变化对土壤微生物群落功能多样性的影响。实验发现,土壤微生物群落培养的平均颜色变化率( AWCD) 增长曲线总的呈现
出坡下部>坡中部>坡上部的规律,且坡下部AWCD 值与坡中部、坡上部间差异显著( P<0.05) ; 坡下部土壤微生物群落功能多
样性显著高于坡中部和坡上部,但不同土层深度( 0—10 cm、10—20 cm) 间无显著性差异( P>0.05) ; 对土壤微生物群落功能多
样性差异贡献较大的碳源是糖类、羧酸类和多酚化合物类碳源; 土壤含水率高低是不同坡位土壤微生物群落功能多样性差异显
著的主要原因; 微生物群落丰富度( H) 和均一度( D) 与土壤全氮含量正相关,优势度( U) 反之,土壤全碳、全磷和pH 对土壤微

Other Abstract

In the loess hilly-gully region,a fragmented terrain considerably impacts soil physical and chemical properties
and vegetation distribution. Soil microbial community is an important biological component of terrestrial ecosystems,and its
structural and functional diversity directly affects the ecological processes of carbon,nitrogen,and other elements. Exploring
the influence of the terrain changes on soil microbial functional diversity is of great significance in order to better understand
the ecological processes and system functional changes at spatial scales. The objective of the present study is to evaluate the
impact of terrain changes on soil microbial community structures in the loess hilly-gully region and support the vegetation
restoration in this area. We collected soil samples at three different slope positions ( downslope,mid-slope,and upslope)along a slope transect in Chenjiawa,Ansai County of Shaanxi Province. At each sampling site,soil samples were collected
in two vertical layers ( 0—10 cm and 10—20 cm) along soil profile. All soil samples were divided into two parts: one part
was used to measure the physical and chemical properties ( total carbon,total nitrogen,total phosphorus,moisture content,
and pH) and the other part was used to analyze the soil microbial community functional diversity using the Biolog microplate
culture method. We then used the principal component analysis ( PCA) to explore the impact of terrain changes on the
functional diversity of the soil microbial communities. The results showed that the growth curves of the Average Well Color
Development ( AWCD) are higher in the downslope position than that in the mid-slope position,which is higher than that in
upslope position. Meanwhile,the functional diversity of soil microbial community at the downslope position is significantly
higher ( P<0.05) than that in the mid-slope and upslope positions; however,there are no significant differences ( P>0.05)
between two soil layers ( 0—10 cm and 10—20 cm) . The differences in using carbon sources reflect the structure and
function of soil microbial communities. PCA shows that sugar,carboxylic acids,and polyphenol compounds contribute most
to soil microbial community functional diversity. The changes in soil moisture content along slope positions are the main
factors affecting the soil microbial community functional diversity. There was a positive correlation between the microbial
community richness( H) and homogeneous degree( D) and the total nitrogen content,whereas the dominance index ( U) is
negatively correlated with the total nitrogen content. Total carbon content,total phosphorus content,and pH have little
effect on community structure and functional diversity. In the present study,the soil physical and chemical properties
showed no significant differences among the three slope positions,but significant differences did exist in soil microbial
community functional diversity among slope positions. The downslope position had a higher soil microbial community
functional diversity than that in the mid-slope and upslope positions,suggesting that the microbial functional diversity is
more sensitive to environmental changes than soil elements such as carbon and phosphorus,and can better reflect the impact
of terrain changes on ecological processes.

Keyword黄土丘陵沟壑区 坡位 土壤微生物群落 功能多样性
Indexed By中文核心期刊要目总览
Document Type期刊论文
First Author Affilication中国科学院水利部水土保持研究所
Recommended Citation
GB/T 7714
李超然,温仲明,李鸣雷,等. 黄土丘陵沟壑区地形变化对土壤微生物群落功能多样 性的影响[J]. 生态学报,2017,37(16):5436-5443.
APA 李超然,温仲明,李鸣雷,朱朵菊,曾鸿文,&史海静.(2017).黄土丘陵沟壑区地形变化对土壤微生物群落功能多样 性的影响.生态学报,37(16),5436-5443.
MLA 李超然,et al."黄土丘陵沟壑区地形变化对土壤微生物群落功能多样 性的影响".生态学报 37.16(2017):5436-5443.
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