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The effects of petroleum-contaminated soil on photosynthesis of Amorpha fruticosa seedlings
Han, G.; Cui, B. X.; Zhang, X. X. & Li, K. R.
Abstract
A pot experiment was conducted to monitor the
dynamic response of photosynthesis of Amorpha fruticosa
seedlings to different concentrations of petroleum-contaminated
soils from April to September. The results
showed that the photosynthetic rates, stomatal conductance
and transpiration rate of seedlings significantly decreased
in 5–20 g kg-1 petroleum-contaminated soil during the
three given sampling period of July 31 (early), August 30
(mid-term) and September 29 (late). However, the intercellular
CO2 concentration significantly increased in
10 g kg-1 contaminated soil, while declined in 20 g kg-1
contaminated soil during the early sampling period as well
as in 20 g kg-1 contaminated soil during the late sampling
period. The leaf relative water content of seedlings significantly
increased in 20 g kg-1 contaminated soil during
the early sampling period, while it dropped dramatically in
15–20 g kg-1 contaminated soil during the late sampling
period. The contents of chlorophyll a, chlorophyll b and the
total chlorophyll of seedlings showed a sharp decline
during the three sampling periods in contaminated soil.
Comprehensively, considering the negative effects of petroleum
on the photosynthesis, growth performance and
remediation effect on petroleum of A. fruticosa seedlings,
this plant was tolerant of petroleum-contaminated soil and
was potentially useful for the phytoremediation of petroleum-
contaminated sites in northern Shaanxi, China.
Keywords
Amorpha fruticosa; Chlorophyll; Crude oil pollution; Photosynthetic response; Water content
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