Differential responses of arbuscular mycorrhizal fungi to nitrogen addition in a near pristine Tibetan alpine meadow. Issue 3 (19th June 2014)

• Record Type: Journal Article
• Authors: Zheng, Yong; Kim, Yong‐Chan; Tian, Xiao‐Fang; Chen, Liang; Yang, Wei; Gao, Cheng; Song, Ming‐Hua; Xu, Xing‐Liang; Guo, Liang‐Dong
• Is Part Of: FEMS microbiology ecology. Volume 89:Issue 3(2014)
• Page Start: 594
• Page End: 605
• Publication Date: 2014-06-19
• Subjects: Microbial ecology -- Periodicals; Microbiology -- Periodicals; 579.17
• DOI: 10.1111/1574-6941.12361
• Languages: English
• ISSNs: 0168-6496

Abstract

<abstract abstract-type="main" id="fem12361-abs-0001"> <title>Abstract</title> <p>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 (<inline-formula><alternatives><inline-graphic mimetype="image" xlink:href="ark:/27927/pgh13028dt0" xlink:type="simple" xmlns:xlink="http://www.w3.org/1999/xlink" /><mml:math altimg="urn:x-wiley:01686496:media:fem12361:fem12361-math-0001" overflow="scroll" xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msubsup><mml:mtext>NH</mml:mtext><mml:mn>4</mml:mn><mml:mo>+</mml:mo></mml:msubsup></mml:math></alternatives></inline-formula>‐N, <inline-formula><alternatives><inline-graphic mimetype="image" xlink:href="ark:/27927/pgh13028dvj" xlink:type="simple" xmlns:xlink="http://www.w3.org/1999/xlink" /><mml:math altimg="urn:x-wiley:01686496:media:fem12361:fem12361-math-0002" overflow="scroll" xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msubsup><mml:mtext>NO</mml:mtext><mml:mn>3</mml:mn><mml:mo>−</mml:mo></mml:msubsup></mml:math></alternatives></inline-formula>‐N, and NH<sub>4</sub>NO<sub>3</sub>‐N) and two N rates (1.5 and 7.5 g N m<sup>−2</sup> year<sup>−1</sup>) in an alpine meadow of the Qinghai–Tibetan Plateau. AM fungal extraradical hyphal density was significantly decreased by <inline-formula><alternatives><inline-graphic mimetype="image" xlink:href="ark:/27927/pgh13028dfx" xlink:type="simple" xmlns:xlink="http://www.w3.org/1999/xlink" /><mml:math altimg="urn:x-wiley:01686496:media:fem12361:fem12361-math-0003" overflow="scroll" xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msubsup><mml:mtext>NH</mml:mtext><mml:mn>4</mml:mn><mml:mo>+</mml:mo></mml:msubsup></mml:math></alternatives></inline-formula>‐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 <inline-formula><alternatives><inline-graphic mimetype="image" xlink:href="ark:/27927/pgh13028dgg" xlink:type="simple" xmlns:xlink="http://www.w3.org/1999/xlink" /><mml:math altimg="urn:x-wiley:01686496:media:fem12361:fem12361-math-0004" overflow="scroll" xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msubsup><mml:mtext>NO</mml:mtext><mml:mn>3</mml:mn><mml:mo>−</mml:mo></mml:msubsup></mml:math></alternatives></inline-formula>‐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.</p> </abstract>