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Moderate Grazing Promotes Fine Root Production in a Northern Saline-Alkaline Grassland
Meng Cui1,2, Congcong Zheng3, Huajie Diao4
1Key Laboratory of Grassland Resources and Ecology of Xinjiang Uygur Autonomous Region, College of Grassland Science, Xinjiang Agricultural University, Urumqi 830052, China.
Plants (Basel, Switzerland)
|May 13, 2026
Summary
Moderate grazing boosts grassland root production by enhancing soil conditions, supporting ecosystem health. This research highlights the importance of managing grazing intensity for sustainable saline-alkali grassland use.
Area of Science:
- Ecology
- Soil Science
- Agronomy
Background:
- Grasslands are vital terrestrial ecosystems where root dynamics influence soil carbon and nutrient cycling.
- Grazing is a primary land use, but its effects on root dynamics across varying intensities are not fully understood.
- Saline-alkali grasslands face unique challenges regarding land management and ecosystem stability.
Purpose of the Study:
- To investigate the impact of different grazing intensities on root production, mortality, standing crop, turnover, and lifespan.
- To understand the seasonal variations in root dynamics and the influence of environmental factors like precipitation.
- To evaluate the role of grazing intensity in shaping root dynamics within a saline-alkali grassland ecosystem.
Main Methods:
- A two-year field experiment was conducted in a saline-alkali grassland in northern China.
- An improved root window method was employed to monitor root dynamics.
- Four grazing intensities were tested: no grazing, light, moderate, and heavy grazing.
Main Results:
- Root production and mortality showed distinct seasonal patterns, peaking in summer and early autumn, primarily influenced by precipitation.
- Moderate grazing significantly increased root production by 51.2%, attributed to altered soil bulk density and selective grazing.
- Grazing intensity did not significantly alter seasonal root dynamics, while root turnover was mainly influenced by plant community composition and interannual precipitation.
Conclusions:
- Moderate grazing positively impacts root growth in saline-alkali grasslands, aligning with the intermediate disturbance hypothesis.
- Sustainable utilization of these fragile ecosystems requires careful management of grazing activities.
- Understanding root dynamics under different grazing pressures is crucial for maintaining grassland health and function.
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