Soil microbial processes in a pine silvopastoral system in NW Patagonia

GONZALEZ POLO M., BAHAMONDE H., PERI P.L., MAZZARINO M.J., CABALLÉ G.

AGROFORESTRY SYSTEMS

SPRINGER

Lugar: Berlin; Año: 2019 vol. 93 p. 255 - 266

0167-4366

The conversion of native vegetation to tree plantation (afforestation) implies a drastic change in life forms and as a consequence, changes in the microenvironmental conditions, and the quantity and quality of organic matter entering the soil. This could affect soil microbial communities and theprocesses catalyzed by them. In Patagonia, afforestation with exotic, fast-growing tree species was a common practice but the consequences on theecosystem remain poorly quantified. The objective was to study the effects of pine afforestation on litter decomposition, soil organic matter, soil microbialactivity and associated biogeochemical functions in a semiarid area of NW Patagonia. We hypothesized that afforestation would decrease litter decomposition rate and soil biological activity including net N mineralization, due to changes of environmental conditions and organic matter quality. We measured in situ and potential soil net N mineralization, soil microbial biomass-C, soil enzyme activities (β-glucosidase, acid phosphatase and leucin-aminopeptidase) and litter decomposition rate. We also characterized soil pH, electrical conductivity, extractable P and total C and N. Pine plantationsclearly affected decomposition rates of native grass vegetation, which was 10% lower under pine canopy cover, and decreased soil microbial biomass. Acidphosphatase activity and leucin-aminopeptidase activities were also marginally reduced. On the other hand, we did not find any significant effects of pineson soil chemical properties and N transformations after 13 years of plantation. Because effects depend strongly on time, the decrease of soil microbialbiomass, acid phosphatase activity and grass decomposition rate (and the trend to lower enzyme activities related to P and N) under pine cover could be anevidence of possible changes on the long-term.