Low Frequency of Plants Associated with Symbiotic Nitrogen-Fixers Exhibits High Frequency of Free-Living Nitrogen Fixing Bacteria: A Study in Karst Shrub Ecosystems of Southwest China
Low Frequency of Plants Associated with Symbiotic Nitrogen-Fixers Exhibits High Frequency of Free-Living Nitrogen Fixing Bacteria: A Study in Karst Shrub Ecosystems of Southwest China
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与共生固氮菌相关的植物频率较低，但自由生活的固氮细菌频率较高：中国西南喀斯特灌木生态系统的研究
DOI：
10.3390/f13020163
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发表时间：
2022-01
期刊：
影响因子：
2.9
通讯作者：
Lening Hu
中科院分区：
文献类型：
--
作者：
Yueming Liang;Xunyang He;Xiangbi Chen;Yirong Su;Fujing Pan;Lening Hu
植物共生固氮菌和土壤游离固氮菌是检测自然生态系统氮源的良好指标。然而，喀斯特灌丛生态系统中与共生固氮菌和土壤游离固氮菌相关的植物群落组成和多样性尚不清楚。研究了21个灌木样地（包括不同地形和植物类型）土壤游离固氮细菌和植物的群落组成、多样性及土壤理化性质。在21个灌丛样地中，与共生固氮剂相关的植物频率较低。21种灌丛土壤中游离固氮细菌群落结构存在差异。根据方差分配分析，地形、植物类型和土壤pH解释了48.5%的细菌群落结构变化。植物类型对群落结构的影响占主导地位，地形（坡向和坡度）和土壤pH的影响较小。土壤游离固氮菌群落丰度与共生固氮菌相关植物丰富度指数呈负相关。与共生固氮菌共生的植物出现频率较低，这一结果凸显了喀斯特地区氮素限制灌木生态系统中土壤游离固氮细菌对固氮来源的重要性。
Plants associated with symbiotic nitrogen-fixers and soil free-living nitrogen-fixing bacteria are good indicators for detecting the source of nitrogen in natural ecosystems. However, the community composition and diversity of plants associated with symbiotic nitrogen-fixers and soil free-living nitrogen-fixing bacteria in karst shrub ecosystems remain poorly known. The community composition and diversity of soil free-living nitrogen-fixing bacteria and plants, as well as the soil physical–chemical properties were investigated in 21 shrub plots (including different topographies and plant types). The frequency of plants associated with symbiotic nitrogen-fixers was found to be low in the 21 shrub plots. The soil free-living nitrogen-fixing bacterial community structure varied among the 21 shrub soils. Based on a variance partitioning analysis, topography, plant type, and soil pH explained 48.5% of the observed variation in bacterial community structure. Plant type had a predominant effect on community structure, and topography (aspect and ascent) and soil pH had minor effects. A negative correlation between the abundance of the soil free-living nitrogen-fixing bacterial community and the richness index for plants associated with symbiotic nitrogen-fixers was observed. The result of the low frequency of plants associated with symbiotic nitrogen-fixers highlights the importance of sources of fixed nitrogen by soil free-living nitrogen-fixing bacteria in the nitrogen limitation shrub ecosystem of the karst regions.
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DOI：
--
发表时间：
2012
期刊：
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影响因子：
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作者：
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DOI：
10.1007/s00468-015-1170-y
发表时间：
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期刊：
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影响因子：
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影响因子：
3.3
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