Edaphic properties override the influence of crops on the composition of the soil bacterial community in a semiarid agroecosystem
Edaphic properties override the influence of crops on the composition of the soil bacterial community in a semiarid agroecosystem
复制标题
DOI：
10.1016/j.apsoil.2016.03.013
复制
发表时间：
2016-09-01
影响因子：
4.8
通讯作者：
Gan, Yantai
中科院分区：
文献类型：
--
作者：
Bainard, Luke D.;Hamel, Chantal;Gan, Yantai
一年生种植系统是动态环境，其中土壤细菌群落对作物轮作等各种管理措施和土壤性质的季节性波动作出反应。然而，在半干旱地区，作物对土壤细菌群落的影响似乎受到土壤水分有效性等土壤特性的调节或影响。因此，本研究的目的是确定半干旱农业生态系统中作物（小麦、扁豆、大田豌豆、油菜和休耕处理）、土壤化学和土壤性质对土壤细菌群落多样性和组成的相对影响。我们使用时间采样策略和高通量测序方法来监测与作物寄主身份、物候和土壤性质相关的土壤细菌群落变化。20个试验点的细菌群落结构主要受土壤pH值的影响，土壤pH值在试验点间差异较大（最小值为5.25，最大值为6.97）。弱颞细菌群落的变化被观察到在生长季节和季节性变化有关的土壤水分(分钟:8.3%,马克斯:20.3%),土壤温度(最低。日平均：最高3.3摄氏度。日平均：21.1摄氏度)，以及土壤中有效磷酸盐的波动（最小：0.003毫克厘米（-2）天（-1），最大：0.290毫克厘米（-2）天（-1））。这些时空变化不受作物寄主身份的影响，因为在作物和休耕处理之间观察到相似的细菌群落。方差划分结果表明，土壤pH和土壤湿度对土壤细菌群落的变异占比较高，而作物对土壤细菌群落的影响不显著。土壤因子似乎覆盖或消除了作物对土壤细菌群落的影响。这些结果强调了在农业生态系统中计算土壤特性对于管理土壤细菌群落的重要性。爱思唯尔B.V.版权所有
Annual cropping systems are dynamic environments where soil bacterial communities are responsive to various management practices such as crop rotations, and to seasonal fluctuations of edaphic properties. However, in semiarid regions the impact of crops on the soil bacterial community appears to be modulated or affected by edaphic properties such as soil moisture availability. Therefore the objective of this study was to determine the relative influence of crops (wheat, lentil, field pea, canola, and a fallow treatment), soil chemistry, and edaphic properties on the diversity and composition of soil bacterial communities in a semiarid agroecosystem. We used a temporal sampling strategy and high throughput sequencing approach to monitor changes in the soil bacterial community in relation to crop host identity and phenology and soil properties. Structuring of the bacterial community across the 20 experimental plots was driven primarily by soil pH which varied strongly (min: 5.25, max: 6.97) across the site. Weak temporal shifts in the bacterial community were observed across the growing season and were related to seasonal variation in soil moisture (min: 8.3%, max: 20.3%), soil temperature (min. daily mean: 3.3 degrees C, max. daily mean: 21.1 degrees C), and fluctuation in available phosphate in the soil (min: 0.003 mg cm(-2) day(-1), max: 0.290 mg cm(-2) day(-1)). These temporal and spatial shifts were not influenced by crop host identity as similar bacterial communities were observed among the crops and fallow treatment. Variance partitioning revealed that soil pH and soil moisture accounted for a high proportion of the variation of the soil bacterial community, while crops had no significant impact in the study. Edaphic factors appeared to override or level the effect of crops on the soil bacterial community. These results highlight the importance of accounting for edaphic properties for managing soil bacterial communities in agroecosystems. Crown Copyright (c) 2016 Published by Elsevier B.V. All rights reserved.