| 不同空间尺度的景观结构对袁河浮游细菌群落的影响 |
| 摘要点击 2786 全文点击 1007 投稿时间：2021-07-21 修订日期：2021-08-24 |
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| 中文关键词 景观结构 浮游细菌 水化学 影响机制 袁河 |
| 英文关键词 landscape structure bacterioplankton community water chemistry influencing mechanism Yuanhe River |
| 作者 | 单位 | E-mail | | 舒旺 | 江西师范大学地理与环境学院, 南昌 330022 | shuwang0717@jxnu.edu.cn | | 王鹏 | 江西师范大学地理与环境学院, 南昌 330022
江西师范大学鄱阳湖湿地与流域研究教育部重点实验室, 南昌 330022 | wangpengjlu@jxnu.edu.cn | | 丁明军 | 江西师范大学地理与环境学院, 南昌 330022
江西师范大学鄱阳湖湿地与流域研究教育部重点实验室, 南昌 330022 | | | 张华 | 江西师范大学地理与环境学院, 南昌 330022
江西师范大学鄱阳湖湿地与流域研究教育部重点实验室, 南昌 330022 | | | 黄高翔 | 江西师范大学地理与环境学院, 南昌 330022
江西师范大学鄱阳湖湿地与流域研究教育部重点实验室, 南昌 330022 | | | 聂明华 | 江西师范大学地理与环境学院, 南昌 330022
江西师范大学鄱阳湖湿地与流域研究教育部重点实验室, 南昌 330022 | |
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| 中文摘要 |
| 为分析不同空间尺度的土地利用与浮游细菌群落的关系以及土地利用对细菌群落的影响机制.于2019年8月（丰水期）和2020年1月（枯水期）在袁河14条支流采集表层水样，基于高通量测序技术确定浮游细菌群落的特征，采用Bioenv和方差分解（VPA）等统计方法分析了不同空间尺度的景观结构（景观组成与景观格局）、水化学特征和浮游细菌群落之间的关系，并基于集合群落理论解释了土地利用和水化学对细菌群落的影响机制.结果表明：①总体上景观配置与细菌群落的相关性不显著，而景观组成与细菌群落的相关性显著，且缓冲区尺度上的相关性高于子流域尺度上的相关性；②从近距离（100 m）到远距离（1000 m）缓冲区，景观组成与细菌群落的相关性没有明显的递减趋势，相关性最大值分别出现在500 m圆形缓冲区（丰水期）和300 m河岸缓冲区（枯水期）；③土地利用通过外源细菌的直接输入（质量效应）和通过影响水化学间接影响（物种分选）浮游细菌群落.方差分解表明水化学和水化学与土地利用的交叉部分对细菌群落变化的解释率（丰水期：13.5%；枯水期：11.7%）高于土地利用单独的解释率（丰水期：2.7%；枯水期：6.9%），表明质量效应和物种分选共同影响了细菌群落，但物种分选的影响超过了质量效应.本研究揭示了不同空间尺度的土地利用结构对细菌群落影响的差异性，研究结果有助于确定影响细菌群落的最佳空间尺度，为流域土地利用管理提供参考依据. |
| 英文摘要 |
| The aim of this study was to examine the relationships between land use and bacterioplankton communities at different spatial scales and the mechanisms underlying the effects of land use on bacterioplankton communities. Here, surface water samples were collected in 14 tributaries of the Yuanhe River in August 2019 (wet season) and January 2020 (dry season), and high-throughput sequencing technology was used to determine the characteristics of the bacterioplankton communities. Statistical methods such as Bioenv and variance partitioning analysis (VPA) were used to explore the relationships among landscape structure (i.e., landscape compositions and landscape configurations), water chemistry, and bacterioplankton communities. Furthermore, metacommunity theory was employed to explain the mechanisms by which land use and water chemistry affect bacterial communities. The results showed that:① in general, the effects of landscape configuration on bacterial communities were weak, whereas the effects of landscape composition on bacterial communities were significant and greater at the buffer scale than that at the sub-basin scale. ② There was no distinct distance-decay pattern for the effects of landscape composition on bacterial communities from the near-distance (100 m) to the long-distance (1000 m) buffer zones, with the maximal effects occurring in the 500 m circular buffer (wet season) and 300 m riparian buffer (dry season), respectively. ③ Land use influenced the bacterioplankton communities both directly through exogenous inputs (i.e., "mass effect" process) and indirectly by affecting water chemistry (i.e., "species sorting" process). VPA showed that the total explanation of bacterial community variations by water chemistry and the intersection of water chemistry and land use (13.5% in the wet season and 11.7% in the dry season) was higher than that of land use alone (2.7% in the wet season and 6.9% in the dry season). These results suggest that mass effects and species sorting jointly shaped bacterial community assembly but that the effects of species sorting outweighed those of mass effects. This study revealed the variability of landscape structure at different spatial scales on bacterial communities, and its results will help to determine the optimal spatial scale affecting bacterial communities and provide a reference basis for watershed land-use management. |
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