The effects of canopy cover on throughfall and soil chemistry in two forest sites in the Mexico city air basin

Runoff foliar and the chemistry of land were compared to two different sites with landfill atmospheric: national park Desierto de los Leones (high atmospheric tank) and the national park zoquiapan (low deposit atmospheric). We compared flows NO3-, SO42-, CA, MG YK runoff foliar low in the canopy of two species of trees: abies religious schl. (Oyameles) and pinus hartwegii Lindl. (Pine), compared to sites with cover, that is clear in the forest. Flows down the following items: oyameles> pine> clear. Consumption of canopy N lead to negative values for the drain foliar net NH4 + at both sites, while the NO3-only at the site of deposit at atmospheric. With few exceptions, the concentration of C, nys totals, SO42-soluble CA2 + and older were in soil under the crown of pine oyameles that under or in the forest clear. In contaminated site, the density of the crown of foliage oyameles result in greater runoff foliar flows and accumulation in the soil of N, S, MG and compared with pine canopy o open areas. The atmospheric altera high deposition process of functional ecosystem, particularly runoff foliar and the cycle of nutrition and the effect depends on the cover and tree species.