Arbuscular mycorrhizal fungi affect seedling recruitment: a potential mechanism by which N deposition favors the dominance of grasses over forbs
Arbuscular mycorrhizal fungi affect seedling recruitment: a potential mechanism by which N deposition favors the dominance of grasses over forbs
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丛枝菌根真菌影响幼苗补充：氮沉积有利于禾本科植物优于非禾本科植物的潜在机制
DOI：
10.1007/s11104-013-1950-3
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发表时间：
2014-02
期刊：
影响因子：
4.9
通讯作者：
Zhang YJ
中科院分区：
文献类型：
--
作者：
Zhen LN;Yang GW;Yang HJ;Chen YL;Liu N;Zhang YJ
背景和目的氮素(N)沉积通常会改变草原植物群落结构，降低植物多样性。幼苗更新是维持物种丰富度的关键，也是植物群落组成的决定因素。丛枝菌根真菌(AMF)是一种分布广泛的共生真菌，可促进苗木的成苗。本试验旨在探讨AM真菌对羊草幼苗萌发的影响是否依赖于N的添加和植物种类的不同。方法在微宇宙中，以5个N的添加比例接种或不接种AM F，连续培养5个月。将欧亚草原的三种主要植物(两种C3草和一种不固氮草)的种子播种到5个月大的微型宇宙中。结果丛枝菌根肥促进了两种C3牧草幼苗的更新，添加量在0.5g·N·m-−-2以上，而非固氮杂草的苗木生长量低于0.5g·N·m-−-2，但低于2.5g·N-m-−-2，促进了幼苗的更新，但低于2.5g·N-m-MF2。结论这一结果在一定程度上解释了为什么在多年生草地群落中，添加氮肥有利于草类植物的优势。我们的研究表明，在氮素沉积的情况下，AMF可能通过调节植被恢复来影响植物群落组成。
Background and aimsNitrogen (N) deposition usually alters plant community structure and reduces plant biodiversity in grasslands. Seedling recruitment is essential for maintaining species richness and determines plant community composition. Arbuscular mycorrhizal fungi (AMF) are widespread symbiotic fungi and could facilitate seedling establishment. Here we conducted an experiment to address whether the influence of AMF on seedling recruitment depends on N addition and plant species.MethodsLeymus chinensiswere cultivated for 5 months in the microcosms that were inoculated with or without AMF at five N addition rates. Seeds of three main species (two C3grasses and one non-N2-fixing forb) of the Eurasian steppe were sown to the 5-month-old microcosms. Seedling establishment was estimated by shoot biomass, N and P contents 7 weeks after seedling germination.ResultsAMF promoted seedlings recruitment of two C3grasses at addition rates above 0.5 g N m−2. In contrast, seedling recruitment of the non-N2-fixing forb was increased by AMF at addition rates below 0.5 g N m−2but was decreased above 2.5 g N m−2.ConclusionsThese results partly explain why N addition favored the dominance of grasses over forbs in perennial grassland communities. Our study indicates that AMF have the potential to influence plant community composition by mediating revegetation in the face of N deposition.
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DOI：
10.5860/choice.31-3799
发表时间：
2013-01
期刊：
--
影响因子：
--
作者：
S. Pal
通讯作者：
S. Pal
影响因子：
4.9
作者：
L. Song;X. Bao;Xuejun Liu;Y. Zhang;P. Christie;A. Fangmeier;Fusuo Zhang
通讯作者：
L. Song;X. Bao;Xuejun Liu;Y. Zhang;P. Christie;A. Fangmeier;Fusuo Zhang
影响因子：
4.2
作者：
Hui Tian;J. Gai;Junling Zhang;P. Christie;X. Li
通讯作者：
Hui Tian;J. Gai;Junling Zhang;P. Christie;X. Li
影响因子：
8.8
作者：
M. V. D. Heijden
通讯作者：
M. V. D. Heijden
DOI：
10.2307/2790
发表时间：
1969-06
期刊：
--
影响因子：
--
作者：
R. Macarthur;E. Wilson
通讯作者：
R. Macarthur;E. Wilson