Grazing increases below-ground biomass and net primary production in a temperate grassland

Background and aims

Grazing can affect the stock and flow of C between above and below-ground vegetation layers. Components of below-ground stratum are one of the less studied. The goals of this research were: 1) to characterize and estimate the vertical distribution of below-ground biomass in grazed and ungrazed areas during a growing season, and 2) to evaluate grazing effects on below-ground net primary production (BNPP).

Methods

Below-ground biomass was cored four times to 100 cm depth during a growing season on three paired grazed-ungrazed areas in South-central Uruguayan grasslands. BNPP was estimated using both field data and CENTURY model.

Results

On average, below-ground biomass was higher in grazed (1417 gm&minus2) than in ungrazed areas (945 gm&minus2) and showed a marked reduction in relation with soil depth. Turnover rates were 0.40 and 0.37 years&minus1 in grazed and ungrazed areas respectively. Field data and CENTURY simulation showed higher BNPP in grazed areas (1.86 0.77 gm&minus2days&minus1 respectively) than in ungrazed areas (1.07 0.67 gm&minus2days&minus1 respectively).

Conclusions

Grazed areas showed higher below-ground biomass, BNPP and turnover that ungrazed areas. Grazing has an important role in regulating both stock and dynamics of C in grassland ecosystems.