Soil Resources Influence Spatial Patterns of Denitrifying Communities at Scales Compatible with Land Management
Soil Resources Influence Spatial Patterns of Denitrifying Communities at Scales Compatible with Land Management
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DOI：
10.1128/aem.02197-09
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发表时间：
2010-04-01
影响因子：
4.4
通讯作者：
Hallin, Sara
中科院分区：
文献类型：
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作者：
Enwall, Karin;Throback, Ingela N.;Hallin, Sara
了解功能性微生物团的空间格局可以增加我们对微生物群落生态学和生态系统功能之间关系的理解。利用地统计学建模映射空间格局，我们探讨了分布的社区结构，规模和活动的一个功能组在N循环，的净化器，在23个土壤参数超过44公顷的农场分为一个有机和一个综合作物生产系统。nirS和nirK基因分别编码两种相互排斥的亚硝酸盐还原酶，cd（1）血红素型和铜还原酶。近红外基因丰度图反映了反硝化活性基因的空间分布格局。在群落结构上，只有nirS群落的图谱与活动有关。活性与硝酸盐和溶解性有机氮和碳，而反硝化作用的基因库，在大小和组成方面，土壤结构的影响。对于nirS社区，pH值和土壤养分也很重要，在塑造社会。与nirK群落相关的唯一参数是土壤Cu含量。然而，空间格局的nirK值因子对应的农场分为两种种植制度。不同的群落格局，以及nirS/nirK丰度比的空间分布，表明栖息地选择的nirS和nirK类型的鸟类。我们的研究结果构成了第一步，在确定生态位的生态位，在规模相关的土地管理。
Knowing spatial patterns of functional microbial guilds can increase our understanding of the relationships between microbial community ecology and ecosystem functions. Using geostatistical modeling to map spatial patterns, we explored the distribution of the community structure, size, and activity of one functional group in N cycling, the denitrifiers, in relation to 23 soil parameters over a 44-ha farm divided into one organic and one integrated crop production system. The denitrifiers were targeted by the nirS and nirK genes that encode the two mutually exclusive types of nitrite reductases, the cd(1) heme-type and copper reductases, respectively. The spatial pattern of the denitrification activity genes was reflected by the maps of the abundances of nir genes. For the community structure, only the maps of the nirS community were related to the activity. The activity was correlated with nitrate and dissolved organic nitrogen and carbon, whereas the gene pools for denitrification, in terms of size and composition, were influenced by the soil structure. For the nirS community, pH and soil nutrients were also important in shaping the community. The only unique parameter related to the nirK community was the soil Cu content. However, the spatial pattern of the nirK denitrifiers corresponded to the division of the farm into the two cropping systems. The different community patterns, together with the spatial distribution of the nirS/nirK abundance ratio, suggest habitat selection on the nirS-and nirK-type denitrifiers. Our findings constitute a first step in identifying niches for denitrifiers at scales relevant to land management.