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ORIGINAL RESEARCH
Photosynthetic Responses of Two Plant
Species on Karst Highway Slopes During
Drought in Guangxi, China
1
Guangxi Xinfazhan Communication Group Co., Ltd, Nanning 530029
2
Institute of Karst Geology, CAGS/Key Laboratory of Karst Dynamics,
MNR & Guangxi/International Research Center on Karst, UNESCO, Guilin, Guangxi, 541004
3
Pingguo Guangxi, Karst Ecosystem, National Observation and Research Station, Pingguo 531406, Guangxi, China
Submission date: 2024-03-25
Final revision date: 2024-04-29
Acceptance date: 2024-05-08
Online publication date: 2025-01-07
Publication date: 2025-05-09
Corresponding author
Fen Huang
Institute of Karst Geology, CAGS/Key Laboratory of Karst Dynamics, MNR & Guangxi/International Research Center on Karst, UNESCO, Guilin, Guangxi, 541004
Institute of Karst Geology, CAGS/Key Laboratory of Karst Dynamics, MNR & Guangxi/International Research Center on Karst, UNESCO, Guilin, Guangxi, 541004
Pol. J. Environ. Stud. 2025;34(4):4189-4200
KEYWORDS
TOPICS
ABSTRACT
Highway construction in the karst areas of Guangxi has caused water- and soil-deficient rocky
desertification slopes. Selecting plant species with high biomass and good drought tolerance is key
for rapid vegetation recovery. This study measured two plant species’ light and CO2 response curves
during extreme drought. At light saturation point (Isat), the net photosynthetic rates (Pn) of Pueraria
lobata (P. lobata) and Bougainvillea spectabilis (B. spectabilis) were low (4.14 and 2.38 μmol·m-2·s-1,
respectively). Under drought conditions, they demonstrated distinct adaptive strategies. As irradiance
increased, the water use efficiency (WUE), transpiration rate (Tr), and stomatal conductance (Gs)
of P. lobata increased faster than those of B. spectabilis. As intercellular CO2 concentration (Ci)
increased, the measured maximum Pn of P. lobata and B. spectabilis were 26.6 and 14.1 μmol·m-2·s-1,
respectively. The Tr and Gs of P. lobata first decreased rapidly, then remained stable, while WUE
increased linearly. However, Tr and Gs of B. spectabilis changed less, and WUE increased less than
that of P. lobata. This shows that P. lobata can better adapt to water deficits and atmospheric CO2
increases than B. spectabilis, with faster biomass accumulation. Measuring photosynthetic response
characteristics is useful for quickly screening suitable plants for rocky desertified slope recovery.
CONFLICT OF INTEREST
The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
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| eISSN: | 2083-5906 |
| ISSN: | 1230-1485 |
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