Nitrogen addition overrides the effects of Stellera chamaejasme litter on the growth of Leymus chinensis and its associated mycorrhizal fungi,Journal of Plant Ecology

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Nitrogen addition overrides the effects of Stellera chamaejasme litter on the growth of Leymus chinensis and its associated mycorrhizal fungi
Journal of Plant Ecology ( IF 2.7 ) Pub Date : 2022-02-02 , DOI: 10.1093/jpe/rtac014
Qiang Guo _{1,

2} , Ruo-hui Zhang _{1,

2} , Xue-Li Li _{1,

2} , Xiao-Wei Liu _{1,

2} , Ya-Nan Li _{1,

2} , Fu Xing _{1,

2}

Affiliation

Abstract

Aims

Rapid spread and growth of plants that are poisonous to animals produces large amounts of plant litter in degraded grasslands. Nitrogen (N) input may promote the growth of these poisonous plants and alter the rhizosphere microbes and arbuscular mycorrhizal fungi (AMF) in particular. However, it is unclear how poisonous plant litter affects the growth of palatable plants and their associated AMF in the rhizosphere and whether and how N deposition may mediate these effects.

Methods

In a meadow steppe in northeast China, a greenhouse experiment was performed to test the combined effects of litter addition of a poisonous plant, S. chamaejasme, and N addition on the growth of a dominant grass, L. chinensis, AMF characteristics, and soil properties.

Important Findings

Litter addition significantly increased the ramet number and aboveground biomass of L. chinensis and soil available phosphorous (AP) and decreased the spore density of AMF. However, the interaction of both treatments had no significant effects on the traits of L. chinensis and the properties of AMF. S. chamaejasme litter positively affected L. chinensis by increasing AP and negatively affected AMF by combining soil nutrient balance changes and litter-induced allelopathic compositions. Higher N addition may alleviate soil N limitation and inhibit litter decomposition, thus overriding the litter's effects on L. chinensis and AMF. These findings imply that it is necessary to objectively and comprehensively evaluate the ecological functions of poisonous plants beyond their harmful effects on livestock. Simultaneously, N deposition should be an indispensable factor in predicting the relationships between poisonous plants and edible plants in degraded grasslands.

更新日期：2022-02-02

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