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Succession of bacterial community composition in coastal agricultural soils along a 1000-year reclamation chronosequence in Hangzhou Bay, China
Ecological Indicators ( IF 7.0 ) Pub Date : 2020-10-05 , DOI: 10.1016/j.ecolind.2020.106972
Feng Wang , Wentao Peng , Bo Zhang , Ying Cao , Juan Zhao , Hui Cao

Soil bacterial successional trajectories under frequently disturbed circumstances (such as agricultural practice) are less known due to the complexity and uncertainty of disturbance. Here, a reclaimed coastal soil chronosequence spanning over a millennium was studied to understand the variation in soil microorganisms. We used 16S rRNA gene-based quantitative PCR to determine bacterial number and Illumina Sequencing to analyse bacterial community composition and diversity. Despite 10-fold higher 16S rRNA gene copy number, coastal sediments showed the lowest bacterial phylogenetic diversity, demonstrating that bacteria acclimatised in the destination environment with low nutrient and high salinity. Among the reclaimed soil, regular variation in microbial distribution (abundance and diversity) and the “disturbance climax” theory can explain the dynamics of bacterial succession. Consistent with soil physicochemical variables, bacterial community varied in an orderly way and changed more drastically at initial stage (early 60 years) but only slightly fluctuated thereafter. The soil variables soil organic matter (SOM), total nitrogen (TN), and electrical conductivity (EC) were confirmed to be the main factors affecting bacterial succession, among which SOM played a dominant role in initial and long-term reclamation stage (500 ~ 1000 years), while TN was more important in mid-term reclamation (5 ~ 280 years).



中文翻译:

杭州湾沿岸1000年开垦时间序列沿岸农业土壤细菌群落组成的演替

由于干扰的复杂性和不确定性,在经常被干扰的情况下(例如农业实践)的土壤细菌演替轨迹鲜为人知。在这里,研究了跨越一千年的开垦沿海土壤时间序列,以了解土壤微生物的变化。我们使用基于16S rRNA基因的定量PCR来确定细菌数量,并使用Illumina测序来分析细菌群落组成和多样性。尽管16S rRNA基因拷贝数增加了10倍,但沿海沉积物显示出最低的细菌系统发育多样性,表明细菌在目标环境中适应了低营养和高盐分环境。在开垦的土壤中,微生物分布的规律变化(丰度和多样性)和“干扰高潮”理论可以解释细菌演替的动态。与土壤理化变量一致,细菌群落以有序的方式变化,并且在初始阶段(60年初期)变化更大,但此后变化很小。土壤变量土壤有机质(SOM),总氮(TN)和电导率(EC)被证实是影响细菌演替的主要因素,其中SOM在初始和长期开垦阶段起着主导作用(500)。 〜1000年),而TN在中期填海(5〜280年)中更为重要。细菌群落以有序的方式变化,并且在初始阶段(60年初期)发生了较大的变化,但此后变化很小。土壤变量土壤有机质(SOM),总氮(TN)和电导率(EC)被证实是影响细菌演替的主要因素,其中SOM在初始和长期开垦阶段起着主导作用(500)。 〜1000年),而TN在中期填海(5〜280年)中更为重要。细菌群落以有序的方式变化,并且在初始阶段(60年初期)发生了较大的变化,但此后变化很小。土壤变量土壤有机质(SOM),总氮(TN)和电导率(EC)被证实是影响细菌演替的主要因素,其中SOM在初始和长期开垦阶段起着主导作用(500)。 〜1000年),而TN在中期填海(5〜280年)中更为重要。

更新日期:2020-10-05
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