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Effect of different Hydrilla verticillata harvesting intensities on Vallisneria natans: Implications for restoring and managing submerged macrophytes
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Effect of different Hydrilla verticillata harvesting intensities on Vallisneria natans: Implications for restoring and managing submerged macrophytes
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Effect of different Hydrilla verticillata harvesting intensities on Vallisneria natans: Implications for restoring and managing submerged macrophytes
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Journal Article
Effect of different Hydrilla verticillata harvesting intensities on Vallisneria natans: Implications for restoring and managing submerged macrophytes
2025
Overview
Background and aims
Harvesting can regulate the overgrowth of submerged macrophytes and affect interspecific competition. However, the effects of harvesting on the growth and competition of submerged macrophytes with different growth forms, remains unclear.
Methods
Simulation experiments were conducted to study the morphological and physiological indicators, competition intensity, and received light intensity of rosette-forming
Vallisneria natans
(
V.natans
) under different harvesting intensities of canopy-forming
Hydrilla verticillata
(
H.verticillata
).
Results
V. natans
had greater plant height and larger leaf area at a medium-intensity (harvest 30% and 45% of the plant height) harvesting than at other intensities. Medium-intensity harvesting was the most conducive to the accumulation of chlorophyll, whereas high-intensity (harvest 60% and 75% of the plant height) harvesting had the lowest chlorophyll content and highest malondialdehyde content in
V. natans
. Interspecific competition was observed between
H. verticillata
and
V. natans
, and the medium harvesting intensity of
H. verticillata
conferred a competitive advantage to
V. natans
. Harvesting
H. verticillata
affect the growth of
V. natans
by increasing the underwater light intensity, with a greater harvest intensity corresponding to stronger light intensity received by
V. natans
. Light conditions were the most suitable for the growth of
V. natans
under medium-intensity harvesting.
Conclusions
Medium-intensity harvesting not only improved the recovery of
H. verticillata
but also increased the competitiveness of
V. natans
, thus promoting the growth of
V. natans
. Therefore, in practice, medium-intensity harvesting can be applied to the regulation of
H. verticillata
and
V. natans
.
