Synergistic aboveground-belowground growth of <i>Bidens pilosa</i> L. in heterogeneous karst habitats

Chen Jin-Yi; Zhang Jing; Li Su-Hui; Song Hai-Yan; Wang Jia-Min; Tao Jian-Ping; Liu Jin-Chun

doi:10.11913/PSJ.2095-0837.2020.60762

Plant Science Journal > 2020 > 38(6): 762-772. > DOI: 10.11913/PSJ.2095-0837.2020.60762 CSTR: 32231.14.PSJ.2095-0837.2020.60762

Chen Jin-Yi, Zhang Jing, Li Su-Hui, Song Hai-Yan, Wang Jia-Min, Tao Jian-Ping, Liu Jin-Chun. Synergistic aboveground-belowground growth of Bidens pilosa L. in heterogeneous karst habitats[J]. Plant Science Journal, 2020, 38(6): 762-772. DOI: 10.11913/PSJ.2095-0837.2020.60762

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Synergistic aboveground-belowground growth of Bidens pilosa L. in heterogeneous karst habitats

Key Laboratory of Eco-Environments in Three Gorges Reservoir Region(Ministry of Education), Chongqing Key Laboratory of Plant Ecology and Resources Research in Three Gorges Reservoir Region, School of Life Sciences, Southwest University, Chongqing 400715, China

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This work was supported by grants from the Fundamental Research Funds for the Central Universities (XDJK2020B037) and National Natural Science Foundation of China (31500399).

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Received Date: March 15, 2020
Revised Date: April 23, 2020
Available Online: October 31, 2022
Published Date: December 27, 2020

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Abstract

Abstract

Based on simulation of heterogeneous karst habitats, the aboveground and belowground growth relationship of Bidens pilosa L. and biomass distribution patterns under two soil habitats (SW: shallow and wide; DN: deep and narrow) and three water treatments (W100%: control; W50%: water reduction by 50%; W30%: water reduction by 70%) were investigated through a randomized block group experiment. Results showed that: (1) Aboveground growth (plant height, ground diameter, leaf area, leaf biomass) and root growth (root length, root surface area, root volume, root biomass) in both habitats decreased with the decrease in applied water; the leaf area ratio increased with the decrease in applied water; and the root-to-mass ratio increased at first and then decreased in the SW soil habitat, but increased in the DN soil habitat. (2) Aboveground biomass and root biomass, leaf area and root length, and leaf area and root growth in each layer of the two habitats showed significant positive correlations. In SW soil habitats, the aboveground biomass of B. pilosa showed a significant positive correlation with the root biomass in each soil layer, whereas in the DN soil habitat, the aboveground biomass was only significantly positively correlated with the middle and upper soil layer root biomass. Studies have shown that B. pilosa exhibited good synergistic aboveground and belowground growth strategies in different habitats. When enhancing the acquisition of belowground resources, B. pilosa also enhanced the acquisition of aboveground resources. In SW soil habitats, B. pilosa coped with rapid drought and water shortages by coordinating the lateral expansion ability of the root system and growth of plant leaves; in DN soil habitats, plants coordinated the downward expansion ability of the root system and expansion of the leaf area to better utilize deep water resources in the soil.
- Heterogeneous karst habitats,
- Water stress,
- Root extension,
- Biomass accumulation

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