Effects of Different Canopy Density on the Chlorophyll Fluorescence and Water Storage Capacity of Sphagnum palustre in the Edge of the Tuntianjing Sinkhole in Bijie City

doi:10.7525/j.issn.1673-5102.2021.02.014

Abstract

Abstract:

In order to enrich the understanding of the growth environment of Sphagnum， explore its possible impact on the formation of erosional karst tiankeng， and find more suitable growth conditions for it， we used gradient method， with S.palustre of different canopy density environments in the edge of the Tuntianjing sinkhole in Bijie City， to definite the chlorophyll fluorescence parameters and water storage capacity. Results showed： ①The initial fluorescence（F_o） and maximum fluorescence（F_m） of S.palustre increased significantly with increasing canopy density（F_o：224.67-264； F_m：716-785.33）. The maximum photochemical efficiency（F_v/F_m） of PSⅡ decreased firstly and then became constant； photochemical quenching coefficient（qP） and photosynthetic electron transport rate（ETR） increased significantly（qP：0.17 -0.46； ETR：5.72-9.68） with increasing canopy density； non-photochemical quenching coefficient（NPQ） decreased significantly from 1.57-0.8. ②With canopy density increased， the rate of water absorption and water storage capacity of S.palustre were significantly increased， the natural water absorption and the saturated water absorption increased from 14.36-26.37 and from 21.7-27.01， respectively； the natural water storage increased from 3 032.97-12 816.01， and the saturated water storage increased from 4 576.34-13 175.97. ③Although S.palustre has a good sunproof， they are more suitable for living in the low light conditions. As canopy density increased， it was beneficial to accumulate chlorophyll， promote photosynthesis and increase the accumulation of biomass， leading to a stronger water storage capacity. Competition can inhibit the growth of S.palustre， share soil moisture， and a certain moisture was very important for the growth of S.palustre. ④The good water-holding properties and water absorption of S.palustre have an important role in slowing surface runoff that slowing down in geological processes. The difference in water holding capacity of S.palustre under different canopy densities can affect the distribution of water flow to a certain extent， thus affecting the formation of erosion-type sinkholes.

Key words: Tiankeng, Sphagnumpalustre, canopy density, chlorophyll fluorescence, pondage

CLC Number:

Q948.114

Kuang-Zheng SHI, Zhao-Hui ZHANG, Chun-Mei HE, Zhi-Hui WANG. Effects of Different Canopy Density on the Chlorophyll Fluorescence and Water Storage Capacity of Sphagnum palustre in the Edge of the Tuntianjing Sinkhole in Bijie City[J]. Bulletin of Botanical Research, 2021, 41(2): 262-269.

Figures/Tables 5

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Table 1

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项目 Project	郁闭度0%（CK） Canopy density 0%	郁闭度30% Canopy density 30%	郁闭度60% Canopy density 60%	郁闭度90% Canopy density 90%
自然吸水率 Natural water absorption(%)	14.36±0.92a	14.6±0.45a	18.8±0.79b	26.37±0.47c
饱和吸水率 Saturated water absorption(%)	21.7±0.49a	22.32±0.34a	23.58±0.31b	27.01±0.11c
自然蓄水量 Natural pondage(g·m^-2)	3032.97±155.67a	5012.49±123.14b	6867.28±72.49c	12816.01±1060.56d
饱和蓄水量 Saturated pondage(g·m^-2)	4576.34±48.79a	8038.44±115.62b	8672.12±110.75c	13175.97±304.67d
生物量 Biomass(g·m^-2)	13.55±0.56a	17.64±0.50b	18.63±0.33c	23.88±1.05d

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