Effects of Long-Term Periodic Submergence on Photosynthesis and Growth of Taxodium distichum and Taxodium ascendens Saplings in the Hydro-Fluctuation Zone of the Three Gorges Reservoir of China

Autor: Changxiao Li, Chaoying Wang, Yingzan Xie, Wenjiao Han, Hong Wei
Rok vydání: 2016
Předmět:
Chlorophyll
Pigments
0106 biological sciences
Leaves
Chloroplasts
Marine and Aquatic Sciences
lcsh:Medicine
Plant Science
Taxodium
Biochemistry
01 natural sciences
Trees
chemistry.chemical_compound
Flooding
Photosynthesis
lcsh:Science
Multidisciplinary
biology
Plant Biochemistry
Plant Anatomy
Crown (botany)
Plants
Horticulture
Productivity (ecology)
Physical Sciences
Cellular Structures and Organelles
Cellular Types
Research Article
China
Chlorophyll a
Plant Cell Biology
Materials Science
010603 evolutionary biology
Species Specificity
Plant Cells
Botany
Ponds
Cypress
Materials by Attribute
Stomata
Organic Pigments
lcsh:R
Organisms
Diameter at breast height
Biology and Life Sciences
Cell Biology
Bodies of Water
Stem Anatomy
biology.organism_classification
chemistry
Earth Sciences
Taxodium ascendens
Environmental science
lcsh:Q
Hydrology
010606 plant biology & botany
Zdroj: PLoS ONE, Vol 11, Iss 9, p e0162867 (2016)
PLoS ONE
ISSN: 1932-6203
DOI: 10.1371/journal.pone.0162867
Popis: Responses of bald cypress (Taxodium distichum) and pond cypress (Taxodium ascendens) saplings in photosynthesis and growth to long-term periodic submergence in situ in the hydro-fluctuation zone of the Three Gorges Dam Reservoir (TGDR) were studied. Water treatments of periodic deep submergence (DS) and moderate submergence (MS) in situ were imposed on 2-year-old bald cypress and pond cypress saplings. The effects of periodic submergence on photosynthesis and growth were investigated after 3 years (i.e. 3 cycles) compared to a control (i.e. shallow submergence, abbreviated as SS). Results showed that pond cypress had no significant change in net photosynthetic rate (Pn) in response to periodic moderate and deep submergence in contrast to a significant decrease in Pn of bald cypress under both submergence treatments, when compared to that of SS. Ratios of Chlorophyll a/b and Chlorophylls/Carotenoid of pond cypress were significantly increased in periodic moderate submergence and deep submergence, while bald cypress showed no significant change. Diameter at breast height (DBH) and tree height of both species were significantly reduced along with submergence depth. Relative diameter and height growth rates of the two species were also reduced under deeper submergence. Moreover, bald cypress displayed higher relative diameter growth rate than pond cypress under deep submergence mainly attributed to higher productivity of the larger crown area of bald cypress. When subjected to deep subergence, both species showed significant reduction in primary branch number, while in moderate submergence, bald cypress but not pond cypress showed significant reduction in primary branch number. These results indicate that both bald cypress and pond cypress are suitbale candidates for reforestation in the TGDR region thanks to their submergence tolerance characteristics, but bald cypress can grow better than pond cypress under deep submergence overall.
Databáze: OpenAIRE
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