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Advisor(s)
Abstract(s)
The Sown Biodiverse Permanent Pastures Rich in Legumes (SBPPRL) mix a large number of
species and cultivars of improved annual pasture species adapted to Mediterranean climate. with a
predominance of Trifolium subterraneum. On a commercial mixed farm were explored the effects of soil
microtopographic gradients on dry matter (OM) yields and species richness in two intensively grazed nearby
pastures - a stabilized SBPPRL and an old seminatural annual pasture (SNP) - established in the same
soil calena, with a high PZ05 and KzO availability. As expected the SBPPRL had higher DM yields than the
SNP, more stable along the slope system, and with a larger legume fraction. The indigenous genotypes of
the SNP seemed unable to translate into biomass soil fertility improvement. SBPPRL improved pasture
species depressed significantly pasture species diversity and species spatial turnover. In the SBPPRL
legumes mainly substituted many short living low productivity autochthonous species common in the SNP.
The buffering of soil ecological gradients is probably important in the explanation of the superior agronomic
performance of SBPPRL. SOM accumulation is certainly involved in this process.
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Citation
Aguiar, Carlos; Rodrigues, M.A; Fernández Nuñez, E.; Domingos, Tiago; Pires, Jaime (2012). The effect of soil microtopographic gradients on dry matter yields and species richness in two Mediterranean pastures. In 14th Meeting of the FAO-CIHEAM Subnetwork on Mediterranean Pastures and Fodder Crops. Samsun, Turkey