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[Effect of cutting on vegetation composition and soil properties]
1Institute of Agricultural Natural Resources and Agricultural Regional Planning, Chinese Academy of Agricultural Sciences, Beijing 100081. zengxibo@public3.bta.net.cn
Ying Yong Sheng Tai Xue Bao = the Journal of Applied Ecology
|January 5, 2002
Summary
Harvesting Imperata cylindrica every six years maximizes biomass and improves soil health. Annual cutting of this invasive grass yields less biomass and degrades soil quality over time.
Area of Science:
- Ecological restoration
- Soil science
- Invasive species management
Background:
- Imperata cylindrica is a widespread invasive grass impacting ecosystems.
- Understanding optimal management strategies for Imperata cylindrica is crucial for ecological restoration and red soil conservation.
Purpose of the Study:
- To investigate the effects of different cutting frequencies on Imperata cylindrica vegetation.
- To evaluate the impact of cutting regimes on biomass production, species composition, and soil physicochemical properties in red soil regions.
Main Methods:
- Conducted cutting experiments on natural Imperata cylindrica in red soil.
- Varied cutting frequencies, including annual and every six years.
- Measured biomass, species composition, soil profile development, and soil physicochemical properties (bulk density, organic matter, nitrogen, phosphorus, potassium).
Main Results:
- Biomass accumulation was highest with cutting every six years and lowest with annual cutting.
- Species composition shifted, with xylophyta dominating in the six-year cutting treatment and herb dominance in annual cutting.
- Longer cutting intervals (every six years) resulted in lower soil bulk density and higher soil organic matter, total nitrogen, available phosphorus, and available potassium compared to annual cutting.
Conclusions:
- Harvesting Imperata cylindrica at longer intervals (e.g., every six years) is more effective for maximizing biomass production.
- Less frequent cutting promotes a more diverse species composition and significantly improves soil physicochemical properties.
- Management strategies for Imperata cylindrica should consider longer cutting cycles to enhance ecosystem health and soil fertility in red soil areas.