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Seasonal Differences in Water-Use Sources of Impatiens hainanensis (Balsaminaceae), a Limestone-Endemic Plant Based on “Fissure-Soil” Habitat Function

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  • Weixia Huang

    (Key Laboratory of Genetics and Germplasm Innovation of Tropical Special Forest Trees and Ornamental Plants, Ministry of Education, Hainan University, Haikou 570228, China
    College of Life and Pharmaceutical Sciences, Hainan University, Haikou 570228, China)

  • Yunfang Zhong

    (Key Laboratory of Genetics and Germplasm Innovation of Tropical Special Forest Trees and Ornamental Plants, Ministry of Education, Hainan University, Haikou 570228, China)

  • Xiqiang Song

    (Key Laboratory of Genetics and Germplasm Innovation of Tropical Special Forest Trees and Ornamental Plants, Ministry of Education, Hainan University, Haikou 570228, China
    College of Forestry, Hainan University, Haikou 570228, China)

  • Cuili Zhang

    (Key Laboratory of Genetics and Germplasm Innovation of Tropical Special Forest Trees and Ornamental Plants, Ministry of Education, Hainan University, Haikou 570228, China)

  • Mingxun Ren

    (Key Laboratory of Genetics and Germplasm Innovation of Tropical Special Forest Trees and Ornamental Plants, Ministry of Education, Hainan University, Haikou 570228, China)

  • Yanjun Du

    (Key Laboratory of Genetics and Germplasm Innovation of Tropical Special Forest Trees and Ornamental Plants, Ministry of Education, Hainan University, Haikou 570228, China
    College of Forestry, Hainan University, Haikou 570228, China)

Abstract

The southwestern mountains of Hainan Island are the southernmost region with tropical karst landform in China. The frequent alternation of dry and wet seasons leads to the loss of the mineral nutrients of limestone, creating karst fissure habitats. Plants living in karst fissure habitats for long periods of time have developed local adaptation mechanisms correspondingly. In the paper, hydrogen–oxygen stable isotope technology was applied to determine the water-use sources of Impatiens hainanensis in the dry and wet seasons, hoping to expound the adaptation mechanism of I. hainanensis in karst fissure habitats to the moisture dynamics in the wet and dry seasons. In the wet season (May to October, 2018), the air humidity is relatively high in the I. hainanensis habitat; in the dry season (November 2018 to April 2019), there is a degree of evaporation. In the wet season, fine-root biomass increases with soil depths, while coarse-root biomass decreases with soil depths; in the dry season, fine-root biomass is lower and coarse-root biomass is higher compared with the wet season. It was found that the average rainfall reached 1523 mm and the main water-use sources were shallow (0–5 cm) and middle (5–10 cm) soil water, epikarst water, and shallow karst fissure water during the wet season; the average rainfall reached 528 mm, and the deep (10–15 cm) soil water and shallow karst fissure water were the main water-use sources during the dry season. Fog water has a partial complementary effect in the dry season. The differences in the distribution of root biomass and each source of water in the wet and dry seasons of I. hainanensis also reflect the different water-use strategies of I. hainanensis in the wet and dry seasons. In both dry and wet seasons, I. hainanensis formed a water-use pattern dominated by soil water and shallow fissure water (0–15 cm) under the influence of the “fissure-soil-plant” system in the karst region.

Suggested Citation

  • Weixia Huang & Yunfang Zhong & Xiqiang Song & Cuili Zhang & Mingxun Ren & Yanjun Du, 2021. "Seasonal Differences in Water-Use Sources of Impatiens hainanensis (Balsaminaceae), a Limestone-Endemic Plant Based on “Fissure-Soil” Habitat Function," Sustainability, MDPI, vol. 13(16), pages 1-20, August.
    • Handle: RePEc:gam:jsusta:v:13:y:2021:i:16:p:8721-:d:608458
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    References listed on IDEAS

    as
    1. Du, Hu & Zeng, Fuping & Song, Tongqing & Liu, Kunping & Wang, Kelin & Liu, Meixian, 2021. "Water depletion of climax forests over humid karst terrain: Patterns, controlling factors and implications," Agricultural Water Management, Elsevier, vol. 244(C).
    2. K. Katsanou & N. Lambrakis & G. Tayfur & A. Baba, 2015. "Describing the Karst Evolution by the Exploitation of Hydrologic Time-Series Data," Water Resources Management: An International Journal, Published for the European Water Resources Association (EWRA), Springer;European Water Resources Association (EWRA), vol. 29(9), pages 3131-3147, July.
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    Cited by:

    1. Yingming Yang & Xikai Wang & Yunlan He & Kaiming Zhang & Fan Mo & Weilong Zhang & Gang Liu, 2022. "Using Isotopic Labeling to Investigate Artemisia ordosica Root Water Uptake Depth in the Eastern Margin of Mu Us Sandy Land," Sustainability, MDPI, vol. 14(22), pages 1-16, November.

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