Catálogo de publicaciones - revistas

<jats:title>Abstract</jats:title><jats:sec> <jats:title>Background and aims</jats:title> <jats:p>Forest management towards increased carbon (C) sequestration has repeatedly been suggested as a “natural climate solution”. We evaluated the potential of altered management to increase C sequestration in boreal <jats:italic>Pinus sylvestris</jats:italic> forest plantations.</jats:p> </jats:sec><jats:sec> <jats:title>Methods</jats:title> <jats:p>At 29 forest sites, distributed along a 1300 km latitudinal gradient in Sweden, we studied interactive effects of fertilization and thinning on accumulation of C in standing biomass and the organic horizon over a 40 year period.</jats:p> </jats:sec><jats:sec> <jats:title>Results</jats:title> <jats:p>Abstention from thinning increased the total C stock by 50% on average. The increase was significant (14% on average) even when C in the removed timber was included in the total ecosystem C pool. Fertilization of thinned stands increased stocks similarly regardless of including (11%) or excluding (12%) removed biomass, and fertilization combined with abstention from thinning had a synergistic effect on C stocks that generated an increase of 79% (35% when removed timber was included in the C stock). A positive effect of fertilization on C stocks was observed along the entire gradient but was greater in relative terms at high latitudes. Fertilization also reduced soil respiration rates.</jats:p> </jats:sec><jats:sec> <jats:title>Conclusion</jats:title> <jats:p>Taken together, our results suggest that changed forest management practices have major potential to increase the C sink of boreal forests. Although promising, these benefits should be evaluated against the undesired effects that such management can have on economic revenue, timber quality, biodiversity and delivery of other ecosystem services.</jats:p> </jats:sec>

<jats:title>Abstract</jats:title><jats:sec> <jats:title>Aims</jats:title> <jats:p>Numerous organisms show range expansions in response to current climate change. Differences in expansion rates, such as between plants and soil biota, may lead to altered interactions in the new compared to the original range. While plant-soil interactions influence plant performance and stress tolerance, the roles of specific soil organisms driving these responses remain unknown.</jats:p> </jats:sec><jats:sec> <jats:title>Methods</jats:title> <jats:p>We manipulated the abundances of nematodes and arbuscular mycorrhizal fungi (AMF), collected from original and new range soils, and examined their effects on the biomass of range-expanding <jats:italic>Centaurea stoebe</jats:italic> and native <jats:italic>Centaurea jacea</jats:italic>. In the first approach, nematode and AMF communities were extracted from field soils, and inoculated to sterilized soil. In the second approach, the abundance of soil organisms in soil inocula was reduced by wet sieving; at first, plants were grown to condition the soil, and then plant-soil feedback was determined under ambient and drought conditions.</jats:p> </jats:sec><jats:sec> <jats:title>Results</jats:title> <jats:p>The origin of soil communities did not influence the biomass production of range-expanding or native plant species, neither by addition nor by (partial) removal. However, after conditioning and under drought, range expanding <jats:italic>C. stoebe</jats:italic> produced more biomass with soil communities from the original range while <jats:italic>C. jacea</jats:italic>, native to both ranges, produced more biomass with new range soil communities.</jats:p> </jats:sec><jats:sec> <jats:title>Conclusions</jats:title> <jats:p>We show that nematode and AMF communities from original and new range have similar effect on the growth of range expanding <jats:italic>C. stoebe.</jats:italic> Our results highlight that the effect of soil communities on plant growth increases after soil conditioning and under drought stress.</jats:p> </jats:sec>