Journal of Plant Research

, Volume 128, Issue 4, pp 573–584 | Cite as

Water relations and gas exchange of fan bryophytes and their adaptations to microhabitats in an Asian subtropical montane cloud forest

  • Liang Song
  • Yong-Jiang Zhang
  • Xi Chen
  • Su Li
  • Hua-Zheng Lu
  • Chuan-Sheng Wu
  • Zheng-Hong Tan
  • Wen-Yao Liu
  • Xian-Meng Shi
Regular Paper

Abstract

Fan life forms are bryophytes with shoots rising from vertical substratum that branch repeatedly in the horizontal plane to form flattened photosynthetic surfaces, which are well suited for intercepting water from moving air. However, detailed water relations, gas exchange characteristics of fan bryophytes and their adaptations to particular microhabitats remain poorly understood. In this study, we measured and analyzed microclimatic data, as well as water release curves, pressure–volume relationships and photosynthetic water and light response curves for three common fan bryophytes in an Asian subtropical montane cloud forest (SMCF). Results demonstrate high relative humidity but low light levels and temperatures in the understory, and a strong effect of fog on water availability for bryophytes in the SMCF. The facts that fan bryophytes in dry air lose most of their free water within 1 h, and a strong dependence of net photosynthesis rates on water content, imply that the transition from a hydrated, photosynthetically active state to a dry, inactive state is rapid. In addition, fan bryophytes developed relatively high cell wall elasticity and the osmoregulatory capacity to tolerate desiccation. These fan bryophytes had low light saturation and compensation point of photosynthesis, indicating shade tolerance. It is likely that fan bryophytes can flourish on tree trunks in the SMCF because of substantial annual precipitation, average relative humidity, and frequent and persistent fog, which can provide continual water sources for them to intercept. Nevertheless, the low water retention capacity and strong dependence of net photosynthesis on water content of fan bryophytes indicate a high risk of unbalanced carbon budget if the frequency and severity of drought increase in the future as predicted.

Keywords

Desiccation tolerance Epiphyte Fan life form Photosynthesis Poikilohydry Water retention capacity 

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Copyright information

© The Botanical Society of Japan and Springer Japan 2015

Authors and Affiliations

  • Liang Song
    • 1
  • Yong-Jiang Zhang
    • 2
  • Xi Chen
    • 1
    • 3
  • Su Li
    • 1
  • Hua-Zheng Lu
    • 1
    • 3
  • Chuan-Sheng Wu
    • 1
    • 3
    • 4
  • Zheng-Hong Tan
    • 1
  • Wen-Yao Liu
    • 1
  • Xian-Meng Shi
    • 1
    • 3
  1. 1.Key Laboratory of Tropical Forest Ecology, Xishuangbanna Tropical Botanical GardenChinese Academy of SciencesKunmingChina
  2. 2.Department of Organismic and Evolutionary BiologyHarvard UniversityCambridgeUSA
  3. 3.University of Chinese Academy of SciencesBeijingChina
  4. 4.Ailaoshan Station for Subtropical Forest Ecosystem StudiesJingdongChina

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