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Abstract Detail



Recent Topics Posters

Guo, Jing  [1], Gao, Yingzhi [2], Eissenstat, David [3], He, Chunguang [4], Sheng, Lianxi [4].

Belowground responses of woody plants to nitrogen addition in a phosphorus-rich region of northeast China.

Soil in cultivated fields of Changbai Mountain region of China are rich in phosphorus (P) and deficient in nitrogen (N) for most woody plants. However, currently N deposition is increasing and reducing its limitation on plant growth. How N addition shifts carbon investment among shoots, roots and arbuscular mycorrhizal (AM) fungi is not well understood, especially in woody plants growing in the field. We examine the responses of the growth, biomass partitioning and AM colonization of Sorbus pohuashanensis Hedl. and Acanthopanax sessiliflorus Seem. to low and high N fertilization in northeastern China on high-P soil over three years. With N addition, both plants increased shoot biomass by 20–45%, and N and P content by 13–30%, while root biomass increased only by 2.1–5.4%. The slower increase in root growth relative to shoot growth resulted in lower root mass fraction. After plant size (ontogeny) was accounted for, root mass fraction still decreased significantly with high N fertilization in both species. Mycorrhizal colonization intensity and AM colonized root length decreased with an increase in N addition. In this P-rich site, the limited increase in root biomass and large decrease in AM colonization with N addition presumably promoted plant growth and nutrient uptake. Our results imply that the growth of these two species may be improved by increased carbon allocation to shoots, as N addition permitted sufficient nutrient uptake by roots and AM fungi to meet shoot nutrient demand without additional belowground carbon expenditure.


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1 - Key Laboratory of Vegetation Ecology, Institute of Grassland Science, Northeast Normal University, 5268 Renmin Street, Changchun, Jilin, 130024, China
2 - Key Laboratory of Vegetation Ecology, Institute of Grassland Science, Northeast Normal University, 5268 Renmin Street, Changchun, Jilin, 130024, China
3 - Penn State University, Ecosystem Science And Managment, 201 Forest Resources Building, University Park, PA, 16802, United States
4 - State Environmental Protection Key Laboratory of Wetland Ecology and V, Northeast Normal University, 2555 Jingyue Street, Changchun, Jilin, 130117, China
5 - State Environmental Protection Key Laboratory of Wetland Ecology and V, Northeast Normal University, 2555 Jingyue Street, Changchun, Jilin, 130117, China

Keywords:
Arbuscular mycorrhiza
Biomass partitioning
Carbon investment
Sorbus pohuashanensis
Acanthopanax sessiliflorus.

Presentation Type:
Session: P, Recent Topics Posters
Location: Arizona Ballroom/Starr Pass
Date: Monday, July 29th, 2019
Time: 5:30 PM
Number: PRT008
Abstract ID:1369
Candidate for Awards:None


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