Soil microbial communities under model biofuel cropping systems in southern Wisconsin, USA: Impact of crop species and soil properties
Soil microbial communities under model biofuel cropping systems in southern Wisconsin, USA: Impact of crop species and soil properties
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DOI：
10.1016/j.apsoil.2011.11.015
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发表时间：
2012-03-01
影响因子：
4.8
通讯作者：
Balser, Teri C.
中科院分区：
文献类型：
--
作者：
Liang, Chao;Jesus, Ederson da C.;Balser, Teri C.
由于全球能源需求不断增加，生物燃料引起的景观变化将在不久的将来对陆地生态系统产生巨大影响，但对潜在生物燃料作物下土壤生物特性的调查尚未得到很好的记录。土壤微生物群在生态系统服务中发挥着重要作用，特别是它们对碳和养分循环的调节。为了提高对土壤微生物群落结构及其影响因素的认识，分析了美国威斯康星州南部玉米、柳枝稷和混合草原生物燃料种植模式下土壤微生物脂类和各种理化因子的变化。主成分分析结果表明，不同作物土壤微生物脂类生物标志物存在一致性差异。微生物量显着低于玉米比草原土壤，柳枝稷中间这些系统。真菌与细菌比例的增加与真菌生物量的净增长相一致，当将常规管理的玉米系统转换为多年生系统时，这表明微生物群落的变化可能受到某些功能群的生态位的创建或扩展的影响，而不是这些群体之间竞争相互作用的再平衡。玉米下的土壤微生物群落结构是不同的，从常年系统的标记指示更大的原地应力在每年的玉米网站和减少的比例丰富的丛枝菌根真菌和增加的革兰氏阳性细菌。同时使用21种脂质生物标志物和17种理化指标进行的RDA分析表明，这些特性与微生物群落的不同子集相关。我们的结论是，种植制度改变了微生物群落组成在这个区域范围内，这也可能会影响与这些不同的社区的微生物过程。这在从区域扩大到国家、大陆或全球范围时可能意义重大。由爱思唯尔公司出版
Biofuel-induced landscape change will have an enormous impact on terrestrial ecosystems in the near future due to globally escalating energy demands, but investigations into the biological properties of soil under potential biofuel crops have not been well documented. The soil microbiota plays a significant role in ecosystem services and especially their regulation of carbon and nutrient cycles. To improve our knowledge about the structure of soil microbial community and the factors that influence it, we analyzed microbial lipids and various soil physicochemical factors under model biofuel cropping systems of corn, switchgrass and mixed prairie in southern Wisconsin, USA. Principal component analysis of lipid biomarkers from soil microbial communities indicated that there were consistent differences among the crop species. Microbial biomass was significantly lower in corn than prairie soils, with switchgrass intermediate to these systems. An increase in fungi to bacteria ratio was coinciding with a net growth in fungal biomass when converting conventionally managed corn system to perennial systems, which indicates the microbial community change could be affected by the creation or expansion of niches for certain functional groups, rather than rebalancing of competitive interactions among these groups. The soil microbial community structure under corn was distinct from the perennial systems with markers indicative of greater in situ stress in annual corn sites and a reduced proportional abundance of arbuscular mycorrhizal fungi and an increased of gram-positive bacteria. Redundancy analysis (RDA) using 21 lipid biomarkers concurrently with 17 physicochemical indices showed that these properties correlated with different subsets of the microbial communities. We conclude that the cropping system shifted the microbial community composition at this regional scale, which may also affect the microbial processes associated with these differing communities. This may be significant when scaled up from regional to national, continental or global scales. Published by Elsevier B.V.