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A CO2 Concentration Gradient Facility for Testing CO2 Enrichment and Soil Effects on Grassland Ecosystem Function

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Published on: November 21, 2015

Plant production decreases whereas nutrients concentration increases in response to the decrease of mowing stubble

Zhaoping Yang¹, Hugjiltu Minggagud², Taogetao Baoyin²

¹Jiangsu Collaborative Innovation Center of Atmospheric Environment and Equipment Technology, School of Environmental Science and Engineering, Nanjing University of Information Science & Technology, Nanjing, 210044, China; Ministry of Education Key Laboratory of Ecology and Resource Use of the Mongolian Plateau &Key Laboratory of Grassland Ecology, School of Ecology and Environment, Inner Mongolia University, Hohhot, 010021, China.

Journal of Environmental Management

|November 1, 2019

Summary

This summary is machine-generated.

Sustainable grassland management requires optimal mowing. Light mowing (over 12 cm stubble) increased biomass, while heavy mowing (under 6 cm) decreased it. The ideal stubble height for grassland biomass and nutrient cycling is 6-12 cm.

Keywords:

Biomass Ecological stoichiometry Inner Mongolia Mowing Nutrient Stubble height

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Area of Science:

Ecology
Agronomy
Environmental Science

Background:

Mowing is a key grassland management practice impacting plant biomass and nutrient cycling.
Understanding the effects of mowing stubble height is crucial for sustainable grassland management.
Previous research has not fully elucidated the relationship between mowing intensity and grassland ecosystem responses.

Purpose of the Study:

To investigate the effects of different annual mowing stubble heights on plant aboveground biomass and nutrient content.
To assess the impact of mowing regimes on soil nutrients in an Inner Mongolian steppe.
To determine the optimal stubble height for sustainable grassland mowing.

Main Methods:

Annual mowing treatments with six different stubble heights (14 cm to <0.3 cm) were applied over four years.
A no-mowing control (CK) was included for comparison.
Plant biomass, nitrogen (N), phosphorus (P), N:P ratio, and soil nutrients were measured.

Main Results:

Plant biomass production increased with light mowing (stubble >12 cm) and decreased with heavy mowing (stubble <6 cm).
Optimal stubble height for biomass production was determined to be 6-12 cm.
Plant N and P concentrations increased with mowing intensity (shorter stubble), but soil properties showed insignificant changes over the four-year period.

Conclusions:

Plant biomass and nutrient content (N, P) respond rapidly to changes in mowing stubble height.
Soil chemical properties exhibited limited response to mowing treatments within the four-year study period.
Long-term studies are recommended to fully understand species compensatory growth and soil-plant feedback mechanisms in response to varying mowing intensities.