Differential responses of arbuscular mycorrhizal fungi to nitrogen addition in a near pristine Tibetan alpine meadow.
Identifieur interne : 001850 ( Main/Corpus ); précédent : 001849; suivant : 001851Differential responses of arbuscular mycorrhizal fungi to nitrogen addition in a near pristine Tibetan alpine meadow.
Auteurs : Yong Zheng ; Yong-Chan Kim ; Xiao-Fang Tian ; Liang Chen ; Wei Yang ; Cheng Gao ; Ming-Hua Song ; Xing-Liang Xu ; Liang-Dong GuoSource :
- FEMS microbiology ecology [ 1574-6941 ] ; 2014.
English descriptors
- KwdEn :
- Fungi (classification), Fungi (growth & development), Fungi (isolation & purification), Fungi (metabolism), Grassland (MeSH), Hyphae (growth & development), Mycorrhizae (classification), Mycorrhizae (growth & development), Mycorrhizae (isolation & purification), Mycorrhizae (metabolism), Nitrogen (metabolism), Soil Microbiology (MeSH), Spores, Fungal (growth & development), Tibet (MeSH).
- MESH :
- chemical , metabolism : Nitrogen.
- classification : Fungi, Mycorrhizae.
- growth & development : Fungi, Hyphae, Mycorrhizae, Spores, Fungal.
- isolation & purification : Fungi, Mycorrhizae.
- metabolism : Fungi, Mycorrhizae.
- Grassland, Soil Microbiology, Tibet.
Abstract
Elucidating the responses of soil microbial abundance and community composition to nitrogen (N) addition is important for predicting ecosystem function under increased atmospheric N deposition. We examined the arbuscular mycorrhizal (AM) fungal community under three N forms (NH4(+)-N, NO3(-)-N, and NH4NO3-N) and two N rates (1.5 and 7.5 g N m(-2) year(-1)) in an alpine meadow of the Qinghai-Tibetan Plateau. AM fungal extraradical hyphal density was significantly decreased by NH4(+)-N in May, but was not affected by N form nor N rate in August. N rate, but not N form, significantly affected AM fungal spore density; high N rate decreased spore density. No direct N addition effect was observed on AM fungal community; however, soil available phosphorus, pH, and NO3(-)-N were considered as important factors that influenced AM fungal community composition. Structural equation model results showed that N rate, not N form, strongly affected soil characteristics, which directly influenced community compositions of plants and AM fungi, as well as spore density. Therefore, AM fungal community was influenced by N addition, primarily because of altered soil characteristics, and partially by a modified plant community, but not or just slightly by direct N addition effects in this alpine meadow ecosystem.
DOI: 10.1111/1574-6941.12361
PubMed: 24890754
Links to Exploration step
pubmed:24890754Le document en format XML
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<author><name sortKey="Zheng, Yong" sort="Zheng, Yong" uniqKey="Zheng Y" first="Yong" last="Zheng">Yong Zheng</name>
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<author><name sortKey="Kim, Yong Chan" sort="Kim, Yong Chan" uniqKey="Kim Y" first="Yong-Chan" last="Kim">Yong-Chan Kim</name>
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<author><name sortKey="Tian, Xiao Fang" sort="Tian, Xiao Fang" uniqKey="Tian X" first="Xiao-Fang" last="Tian">Xiao-Fang Tian</name>
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<author><name sortKey="Chen, Liang" sort="Chen, Liang" uniqKey="Chen L" first="Liang" last="Chen">Liang Chen</name>
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<author><name sortKey="Yang, Wei" sort="Yang, Wei" uniqKey="Yang W" first="Wei" last="Yang">Wei Yang</name>
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<author><name sortKey="Gao, Cheng" sort="Gao, Cheng" uniqKey="Gao C" first="Cheng" last="Gao">Cheng Gao</name>
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<term>Grassland (MeSH)</term>
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<term>Soil Microbiology (MeSH)</term>
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<front><div type="abstract" xml:lang="en">Elucidating the responses of soil microbial abundance and community composition to nitrogen (N) addition is important for predicting ecosystem function under increased atmospheric N deposition. We examined the arbuscular mycorrhizal (AM) fungal community under three N forms (NH4(+)-N, NO3(-)-N, and NH4NO3-N) and two N rates (1.5 and 7.5 g N m(-2) year(-1)) in an alpine meadow of the Qinghai-Tibetan Plateau. AM fungal extraradical hyphal density was significantly decreased by NH4(+)-N in May, but was not affected by N form nor N rate in August. N rate, but not N form, significantly affected AM fungal spore density; high N rate decreased spore density. No direct N addition effect was observed on AM fungal community; however, soil available phosphorus, pH, and NO3(-)-N were considered as important factors that influenced AM fungal community composition. Structural equation model results showed that N rate, not N form, strongly affected soil characteristics, which directly influenced community compositions of plants and AM fungi, as well as spore density. Therefore, AM fungal community was influenced by N addition, primarily because of altered soil characteristics, and partially by a modified plant community, but not or just slightly by direct N addition effects in this alpine meadow ecosystem.</div>
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<Abstract><AbstractText>Elucidating the responses of soil microbial abundance and community composition to nitrogen (N) addition is important for predicting ecosystem function under increased atmospheric N deposition. We examined the arbuscular mycorrhizal (AM) fungal community under three N forms (NH4(+)-N, NO3(-)-N, and NH4NO3-N) and two N rates (1.5 and 7.5 g N m(-2) year(-1)) in an alpine meadow of the Qinghai-Tibetan Plateau. AM fungal extraradical hyphal density was significantly decreased by NH4(+)-N in May, but was not affected by N form nor N rate in August. N rate, but not N form, significantly affected AM fungal spore density; high N rate decreased spore density. No direct N addition effect was observed on AM fungal community; however, soil available phosphorus, pH, and NO3(-)-N were considered as important factors that influenced AM fungal community composition. Structural equation model results showed that N rate, not N form, strongly affected soil characteristics, which directly influenced community compositions of plants and AM fungi, as well as spore density. Therefore, AM fungal community was influenced by N addition, primarily because of altered soil characteristics, and partially by a modified plant community, but not or just slightly by direct N addition effects in this alpine meadow ecosystem.</AbstractText>
<CopyrightInformation>© 2014 Federation of European Microbiological Societies. Published by John Wiley & Sons Ltd. All rights reserved.</CopyrightInformation>
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