Mixed Cultivation With Siberian Alder Worsens the Negative Impact of Salt Exposure on Growth and Major Physiological Processes of Black Locust Plants
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View abstract on PubMed
Summary
This summary is machine-generated.Mixed planting Siberian alder with black locust (Robinia pseudoacacia) on saline soil inhibits growth and nitrogen fixation. This interspecific competition reduces salinity tolerance in black locust seedlings.
Area Of Science
- Plant Ecology
- Soil Science
- Forestry
Background
- Salinity poses a significant threat to plant growth and development.
- Mixed planting strategies can enhance salinity tolerance in tree species.
- The effect of admixing alder trees on nitrogen-fixing black locust in saline soils is not well understood.
Purpose Of The Study
- To investigate the impact of mixed planting with Siberian alder (Alnus hirsuta) on the growth, physiological responses, and salinity tolerance of black locust (Robinia pseudoacacia) in saline soil.
- To determine if interspecific competition affects nitrogen fixation and overall health of black locust under salt stress.
- To provide insights into establishing mixed black locust forests on salinized lands.
Main Methods
- Comparative analysis of single-planted and mixed-planted Robinia pseudoacacia seedlings under salt exposure.
- Assessment of growth parameters, photosynthetic efficiency, and chlorophyll content.
- Measurement of cation content (Na+), osmolytes, antioxidant indicators (malondialdehyde, hydrogen peroxide), and nodule nitrogenase activity.
Main Results
- Salt exposure reduced biomass, photosynthesis, chlorophyll, and nitrogenase activity in both single and mixed plantings.
- Salt stress increased Na+, malondialdehyde, and hydrogen peroxide accumulation in Robinia leaves.
- Mixed planting with Siberian alder significantly inhibited Robinia growth and nitrogen fixation, exacerbating Na+ toxicity and oxidative stress compared to single planting.
Conclusions
- Admixing Siberian alder with black locust seedlings on saline soil inhibits nitrogen fixation and reduces salinity tolerance.
- Interspecific competition under mixed planting negatively impacts black locust's physiological functions and stress response.
- Results suggest caution when establishing mixed black locust forests on salinized soils at the seedling stage.
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