Root stoichiometric dynamics and homeostasis of invasive species Phyllostachys edulis and native species Cunninghamia la
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ORIGINAL PAPER
Root stoichiometric dynamics and homeostasis of invasive species Phyllostachys edulis and native species Cunninghamia lanceolata in a subtropical forest in China Chao Peng1 · Jia Tu1 · Ming Yang1 · Yong Meng1 · Meiqun Li1 · Wensheng Ai1
Received: 25 March 2020 / Accepted: 28 May 2020 © Northeast Forestry University 2020
Abstract The community species abundance and diversity declined with bamboo invasion had been widely reported worldwide. However, the physiological strategies used during root competition between native species and invasive bamboo are poorly understood. To clarify the mechanisms underlying such strategies, the stoichiometric dynamics and homeostasis of nitrogen, phosphorus, organic carbon in root orders of Phyllostachys edulis (I du [=I-Pe, years 1 and 2]; II du [=II-Pe, years 3 and 4]), Cunninghamia lanceolata in transition and pure forests were analyzed. With increasing intensity of bamboo invasion, N, P, and C content of C. lanceolata root orders declined, N and P content in P. edulis rhizome orders declined, while C increased, the stoichiometric ratios in mixed forest interface mainly increased, and the stoichiometric differences within native and invasive species root orders narrowed. Meanwhile, the stoichiometric homeostasis index (H) of elements in the same root order and even the same elements in different root orders were not consistent. H of most root orders (except some HP) was greater than 4, the H ranked order was I-Pe > Cl > II-Pe in mixed interfaces, and the N:P ratio of most species root orders was greater than 16, despite being affected by invasion. Our research concluded that the bamboo invasion narrows
Project funding: This work was funded by the Forestry Science and Technology Plan Project of Hunan Province (XLK201809). The online version is available at http://www.springerlink.com. Corresponding editor: Yanbo Hu. * Chao Peng [email protected] 1
Institute of Bamboo Research, Hunan Academy of Forestry, Changsha 410004, Hunan Province, P. R. China
stoichiometric differences within root orders, and the juvenile bamboo rhizome has a stronger capacity for homeostatic regulation than in adult bamboo and C. lanceolata, which is a key determinant of bamboo invasion success. Keywords Bamboo invasion · Root orders · Nutrient dynamics · Homeostatic regulation coefficient
Introduction Plants obtain nutrients from the soil nutrient pool via their root systems, and the correlation between concentrations of soil nutrients is considered as an indicator of resource utilization strategies for plants in a changing environment (Ordoñez et al. 2009; Hong et al. 2015). Therefore, root interactions define community structure, and finally, stability (Casper et al. 2003). Stable root stoichiometry is crucial for regulation of plant physiology and life cycle and for interspecific competitiveness when the environment changes (Kooijman 1995; Elser et al. 2000), since higher nutrient plasticity provides plants a long-term competitive advantage (Wang et al. 2012; Kramer-Walter an
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