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plant phenols contents and their changes with nitrogen availability in peatlands of northeastern China

Journal of plant Ecology 2020年第6期13卷 713-721页

作者： Di Wu Xian-Wei Wang Shi-Qi Xu Chong-Juan Chen Rong Mao Xue-Yan Liu School of Earth System Science Tianjin UniversityTianjin 300072China Key Laboratory of Wetland Ecology and Environment Northeast Institute of Geography and AgroecologyChinese Academy of SciencesChangchun 130102JilinChina College of Forestry Jiangxi Agricultural UniversityNanchang 330045JiangxiChina

Aims Climate warming and increasing nitrogen(N)deposition have influenced plant nutrient status and thus plant carbon(C)fixation and vegetation composition in boreal ***,which are secondary metabolites in plants for defense and adaptation,also play important roles in regulating peatland C dynamics due to their anti-decomposition ***,how the phenolic levels of different functional types of plants vary depending on nutrient availability remain unclear in boreal *** Here,we investigated total phenols contents(TPC)and total tannins contents in leaves of 11 plant species in 18 peatlands of the Great Hing’an Mountains area in northeastern China,and examined their variations with leaf N and phosphorus(P)and underlying *** Findings Shrubs had higher TPC than graminoids,indicating less C allocation to defense and less uptake of organic N in faster-growing and nonmycorrhizal graminoids than in slower-growing and mycorrhizal *** shrubs,leaf TPC decreased with increasing N contents but was not influenced by changing leaf phosphorus(P)contents,which suggested that shrubs would reduce the C investment for defense with increasing N ***,leaf TPC of graminoids increased with leaf N contents and decreased with leaf P *** graminoids are more N-limited and less P-limited,we inferred that graminoids would increase the defensive C investment under increased nutrient *** concluded that shrubs would invest more C in growth than in defense with increasing N availability,but it was just opposite for graminoids,which might be an important mechanism to explain the resource competition and encroachment of shrubs in boreal peatlands in the context of climate warming and ever-increasing N deposition.

关键词： boreal peatlands plant phenols plant defense theory plant functional types nitrogen availability

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