caa a22 4500 463209028 CHVBK 20180405153134.0 cr unu---uuuuu 170326e20070701xx s 000 0 eng 10.1007/s10705-007-9089-3 doi (NATIONALLICENCE)springer-10.1007/s10705-007-9089-3 Effects of trees and understorey management on soil fertility and nutritional status of holm oaks in Spanish dehesas [Elektronische Daten] [Gerardo Moreno, José Obrador] A dehesa is a multipurpose agroforestry system with scattered oaks. This study focuses on the influence of trees on soil chemical fertility and on the consequences of dehesa land use for soil fertility and nutritional status of trees. To achieve that we have studied the content of several nutrients in soils and tree leaves in four Spanish dehesas, considering three types of land use: scattered holm oak with an understorey of either native grasses (G), shrubs (E) or crop (C: either fertilized or unfertilized). We randomly selected six oaks per farm and land use for soil and tree leaf sampling. Soil samples were taken at five distances from each tree trunk (2, 5, 10, 15, and 20m) at a depth of 0-30cm. SOM, CEC, total and mineral-N, available-P, and exchangeable Ca, Mg and K were analysed. Foliar samples were collected from every tree in two consecutive years (2002 and 2003) at leaf maturity. The total content of N, P, K, Ca, and Mg was determined. Soils of C plots showed significantly higher contents for most of the nutrients studied than G ones. Cropping also affected trees positively, with higher foliar contents of N and K in C plots than in G ones. Foliar content did not decrease for any nutrient, and tree-crop interaction is interpreted as a mechanism of complementarity in terms of nutrient use. Shrub encroachment led to a higher content of organic-N and exchangeable cations in soils, but to a decrease in mineral N and available-P. The tree foliar contents of N, Mg, and Ca were lower in E plots than in G plots, probably as a consequence of the tree-shrub competition for those nutrients. By contrast, P content of tree leaves increased significantly in E plots compared to G plots. Springer Science+Business Media B.V., 2007 Encroachment nationallicence Intercrop nationallicence Nutrient pump nationallicence Open woodland nationallicence Tree-understorey interaction nationallicence Moreno Gerardo Forestry School, Universidad de Extremadura, Plasencia, Spain aut Obrador José Col. Postgraduados, Campus Tabasco, H. Cárdenas, Tabasco, Mexico aut Nutrient Cycling in Agroecosystems Kluwer Academic Publishers 78/3(2007-07-01), 253-264 1385-1314 78:3<253 2007 78 10705 https://doi.org/10.1007/s10705-007-9089-3 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10705-007-9089-3 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Moreno Gerardo Forestry School, Universidad de Extremadura, Plasencia, Spain aut NATIONALLICENCE 700 1- Obrador José Col. Postgraduados, Campus Tabasco, H. Cárdenas, Tabasco, Mexico aut NATIONALLICENCE 773 0- Nutrient Cycling in Agroecosystems Kluwer Academic Publishers 78/3(2007-07-01), 253-264 1385-1314 78:3<253 2007 78 10705 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer