Mowing Facilitated Shoot and Root Litter Decomposition Compared with Grazing.

Area of Science:

• Ecology
• Soil Science
• Environmental Science

Background:

• Litter decomposition is vital for soil organic carbon and nutrient cycling.
• Altitude and land use are key factors influencing decomposition in mountain grasslands.
• Limited research exists on the combined effects of land use and altitude on litter decomposition.

Purpose of the Study:

• To investigate how land-use type (mowing vs. grazing) affects shoot and root litter decomposition of *Bromus inermis* at different altitudes.
• To understand the environmental factors driving these decomposition processes.
• To elucidate the complex interactions between land use, altitude, and litter decomposition.

Main Methods:

• Litterbags containing shoot or root litter were placed in mowing and grazing plots across two altitudes for one year.
• Mass loss rate of litter was measured.
• Environmental attributes, including soil properties and microbial activity indicators, were assessed.

Main Results:

• Litter decomposed faster in mowing than grazing plots, attributed to higher plant cover, soil moisture, and lower bulk density.
• Increased altitude promoted litter decomposition, correlating positively with soil moisture, soil organic carbon (SOC), and β-xylosidase activity.
• Mowing's positive effect on shoot decomposition was more pronounced at lower altitudes, while root decomposition varied complexly with land use and altitude.

Conclusions:

• Land use and altitude interact to regulate litter decomposition and nutrient cycling in mountain grasslands.
• Mowing generally enhances decomposition, but its effectiveness relative to grazing is modulated by altitude.
• Understanding these dynamics is crucial for managing carbon and nutrient cycles in these ecosystems.