Abstract

PENA-MENDOZA, Enrique R. et al. Nutrients in foliage and wet deposition of nitrate, ammonium and sulfate in washing tree top in Abies religiosa forests. Rev. Mex. Cienc. Agríc [online]. 2016, vol.7, n.spe14, pp.2793-2805. ISSN 2007-0934.

The nutritional content and tree top in the forests are evaluated of Abies religiosa, San Miguel Tlaixpan (SMT) and Rio Frio (RF), State of Mexico. The work had two parts. In the first, the nutritional content was evaluated in new foliage (N, P, K, Ca and Mg) in Abies religiosa trees, in periods of spring, summer and winter, in stands with different degrees of damage tree top. The results showed no correlation between the degree of damage of tree top and nutrient content variation in foliage, except for N and Mg with higher leaf content compared with the control RF site. Furthermore, no deficiencies of nutrients studied were found; however, the Mg / N was stable at the time of sampling in the control site RF, while the ratio decreased SMT. In the second part it was carried out an analysis of the ionic forms of nitrogen and sulfur wash tree top . The results indicate moderate deposits at both sites. However, significant differences in washing NH4+-N tree top between the two forests were found, with values of 8.56 and 4.34 kg ha-1 yr-1 in SMT and RF. In the same order, the flow of NO3- N was 4.40 and 2.84 kg ha-1 yr-1 but the differences were not statistically significant. The total deposit of N varied was 12.96 and 7.18 for SMT and RF, respectively. To SO42 - flows were 15.36 and 6.67 kg ha-1 yr-1 in SMT and RF, in the same order.

Keywords : Abies religiosa; air pollution; atmospheric deposition; forest nutrition.

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