干旱区生态环境知识资源中心(Arid): 荒漠灌木梭梭( Haloxylon ammodendron)周围土壤微生物的空间分布

Arid

	荒漠灌木梭梭( Haloxylon ammodendron)周围土壤微生物的空间分布
其他题名	The spatial distribution of soil microbes around a desert shrub of Haloxylon ammodendron
	曹艳峰 1; 李彦1 ; 李晨华 1; 吕光辉2
来源期刊	生态学报
ISSN	1000-0933
出版年	2016
卷号	36 期号:6 页码:1628-1635
中文摘要	以古尔班通古特沙漠荒漠生态系统中主要优势种梭梭(Haloxylon ammodendron)冠幅内外的土壤为研究对象,通过分析从树干基部向外水分和养分变化下土壤微生物生物量、多样性和群落组成的变化规律,试图揭示荒漠生态系统中土壤微生物空间分布的基本特征。微生物生物量和多样性采用磷脂脂肪酸进行测定。结果表明:从树干基部向外,土壤微生物总生物量、多样性以及不同微生物类群的生物量均随土壤水分和养分含量降低而逐渐降低,指示了土壤微生物从裸地向内集聚分布的特征。另外,在微生物群落组成中,不同类群微生物的生物量从树干基部向外的减少程度有所不同,例如,从树干基部附近5 cm处到冠外裸地200 cm处,真菌、细菌、革兰氏阳性菌、革兰氏阴性菌的生物量分别减少了50.25%、84.06%、82.70%、92.57%,指示了细菌从裸地向内集聚分布的程度强于真菌,革兰氏阴性菌从裸地向内集聚分布的程度也较强于革兰氏阳性菌。研究表明,在资源稀缺的荒漠生态系统中,土壤微生物倾向于分布在冠内资源丰富的区域。土壤微生物的空间分布不仅与资源的丰富度有关,而且与微生物自身对环境变化的忍耐性或敏感性有关。
英文摘要	Fertile islands’orresource islands’are considered to be a featured pattern in desert ecosystems. Water and nutrient contents are found to be higher in under- than inter-shrub soils. One general idea is that soil water and nutrients have a close correlation with microbes. However,it remains controversial on whether the spatial distribution of soil microbes around shrubs is determined by soil water and nutrients of fertile islands. In addition,different microbial groups,such as fungi,bacteria,Gram-positive and Gram-negative bacteria,have distinct sensitivity or tolerance to the changes of soil water and nutrients. How these microbes distribute around shrubs and their relations with soil water and nutrients calls for further study. In the current study,under-and inter-shrub soils of Haloxylon ammodendron (height 200210 cm,basal diameter 910 cm and crown width 200 * 200 cm),a dominant species in desert ecosystems of Gurbantunggut Desert,were studied. Soil samples were collected in circles with radii of 5,40,100 and 200 cm respectively from tree base in horizontal directions,and from depths of 020 cm. The sampling points of 5,40,100 and 200 cm represent the vicinity of tree base,the center of canopy,the edge of canopy and barren interspaces of shrubs,respectively. Soil samples from four directions,with angles between the adjacent directions at 90°,were mixed to obtain one composted sample. By analyzing changes in soil microbial biomass,diversity and community composition with changes of soil water and nutrients outward from tree base,the features of spatial distribution of soil microbes around shrubs was revealed. Microbial biomass, abundance and community composition were examined using phospholipid fatty acids. Redundancy analysis (RDA) was conducted to assess the correlations between soil properties and microbes. With the decreasing of soil water and nutrient content from the vicinity of tree base to interspaces of shrubs,total microbial biomass and diversity,as well as the biomass of different microbial groups,decreased gradually,indicating an increase of soil microbes inward from interspaces of shrubs. In addition,for the microbial composition in the soil,the biomass of different microbial groups had different reduction rate outward from tree base. For example,from the vicinity of tree base ( i. e. 5 cm) to interspaces ( i. e. 200 cm),the biomass of fungi,bacteria,Gram-positive and Gram-negative bacteria reduced 50.25%、84.06%、82.70%、92.57%,respectively. RDA results also showed that soil water,available nitrogen and organic carbon had a stronger correlation with bacteria comparing to fungi,and Gram-negative bacteria also correlated stronger than Gram-positive bacteria. This demonstrated that inward from interspaces,the increases of bacteria was more significant than fungi,and that of Gram-negative bacteria was more significant than Gram-positive bacteria. Our study suggested that soil microbes tended to distribute in soil resource-rich areas under the shrub canopy in resource-poor desert ecosystems. The spatial distribution of soil microbes was influenced more directly by soil properties than microclimate factors. Furthermore,the spatial distribution of soil microbes was not only determined by soil resource abundance,but also by the tolerance or sensitivity of different groups of microbes to environmental variations.
中文关键词	古尔班通古特沙漠 ; 梭梭 ; 微生物生物量 ; 空间分布
英文关键词	Gurbantunggut Desert Haloxylon ammodendron microbial biomass spatial distribution
语种	中文
国家	中国
收录类别	CSCD
WOS类目	BIOLOGY
WOS研究方向	Life Sciences & Biomedicine - Other Topics
CSCD记录号	CSCD:5706899
来源机构	中国科学院新疆生态与地理研究所 ; 新疆大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/234757
作者单位	1.中国科学院新疆生态与地理研究所, 荒漠与绿洲生态国家重点实验室, 乌鲁木齐, 新疆 830011, 中国; 2.新疆大学资源与环境学院, 乌鲁木齐, 新疆 830046, 中国
推荐引用方式 GB/T 7714	曹艳峰,李彦,李晨华,等. 荒漠灌木梭梭( Haloxylon ammodendron)周围土壤微生物的空间分布[J]. 中国科学院新疆生态与地理研究所, 新疆大学,2016,36(6):1628-1635.
APA	曹艳峰,李彦,李晨华,&吕光辉.(2016).荒漠灌木梭梭( Haloxylon ammodendron)周围土壤微生物的空间分布.生态学报,36(6),1628-1635.
MLA	曹艳峰,et al."荒漠灌木梭梭( Haloxylon ammodendron)周围土壤微生物的空间分布".生态学报 36.6(2016):1628-1635.