<?xml version="1.0" encoding="UTF-8"?><xml><records><record><source-app name="Biblio" version="7.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Qarro, M</style></author><author><style face="normal" font="default" size="100%">de Montard, F X</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Étude de la productivité des parcours de la zone d'Ain-Leuh (Moyen Atlas, plateau Central). II. Modélisation de la production d'herbe : interactions climats × sol × recouvrement arboré</style></title><secondary-title><style face="normal" font="default" size="100%">Agronomie</style></secondary-title></titles><keywords><keyword><style  face="normal" font="default" size="100%">climatic factor</style></keyword><keyword><style  face="normal" font="default" size="100%">dry matter</style></keyword><keyword><style  face="normal" font="default" size="100%">nitrogen output</style></keyword><keyword><style  face="normal" font="default" size="100%">production</style></keyword><keyword><style  face="normal" font="default" size="100%">range</style></keyword><keyword><style  face="normal" font="default" size="100%">silvopastoral agriculture</style></keyword><keyword><style  face="normal" font="default" size="100%">tree cover rate</style></keyword></keywords><dates><year><style  face="normal" font="default" size="100%">1992</style></year></dates><volume><style face="normal" font="default" size="100%">12</style></volume><pages><style face="normal" font="default" size="100%">489-501</style></pages><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">A study of dry matter production in rough pastures of Ain-Leuh (Middle Atlas, central plateau). II. Model of herbage production: climate-soil-tree cover interactions. Herbaceous production was measured in 1983 and 1984 in the Middle Atlas and central plateau rangelands and grazed forests, in the Aïn-Leuh region, at 4 characteristic sites in 4 bioclimatic zones: semi-arid (Quercus ilex and Juniperus oxycedrus forest), sub-humid (pure Quercus ilex forest), and humid (Cedrus atlanticus and Quercus ilex forest, unsylvatic low grass at the highest site); measurements were made in areas protected from sheep and goat grazing, through 5 successive cuts from late February to mid-July, on plots varying in tree cover from 0 to 90%. Late February yield was mainly explained through the degree of precipitation occurring in both September plus October, interacting with the levels of soil nitrogen in poor soils of the Quercus and Juniperus zone, or level of rough sand in clay soils of the 3 upper zones. Yields from 4 successive cuts from the end of March to mid-July were mainly explained through interactions between radiative energy and a function of tree cover rate (100-R) eR/B; the B value was 50 in the semi-arid zone, and 90 for non-legume and 50 for legume plants in the sub-humid/humid zone). A climate humidity factor, the ETR/ETP ration in sub-humid and humid zone or the frequency of rainy days in the semi-arid zone, had an additive and an interactive effect respectively.</style></abstract></record><record><source-app name="Biblio" version="7.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Qarro, M</style></author><author><style face="normal" font="default" size="100%">de Montard, F X</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Etude de la productivité des parcours de la zone d'Ain-Leuh (Moyen Atlas, plateau central). I. Effets de la fréquence d'exploitation et du taux de couvert arboré sur la productivité herbacée</style></title><secondary-title><style face="normal" font="default" size="100%">Agronomie</style></secondary-title></titles><keywords><keyword><style  face="normal" font="default" size="100%">clipping</style></keyword><keyword><style  face="normal" font="default" size="100%">dry matter</style></keyword><keyword><style  face="normal" font="default" size="100%">rythm</style></keyword><keyword><style  face="normal" font="default" size="100%">silvopastoral</style></keyword><keyword><style  face="normal" font="default" size="100%">water deficit</style></keyword></keywords><dates><year><style  face="normal" font="default" size="100%">1989</style></year></dates><volume><style face="normal" font="default" size="100%">9</style></volume><pages><style face="normal" font="default" size="100%">477-487</style></pages><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">Rough pastures in Middle Atlas spread over four bioclimatic levels: 1, Quercus ilex and Juniperus oxycedrus forest; 2, pure Quercus ilex forest; 3, Cedrus atlantica and Quercus ilex forest; 4, unsylvatic low grass, from 900 to 2 200 m above sea level. Dry matter production of grass was measured from and underneath the tree canopy in 1983 and 1984 in order to compare the effect of a variety of intervals between cuts and to measure shadow influence. Grass growth mainly occured from late January to early July; it began later at Cedrus-Quercus and low grass sites and stopped earlier at pure Quercus and Quercus-Juniperus sites, depending on longer frost persistence at highest levels, on earlier arrival of drought at lowest levels. Mean dry matter production was 2.5 kg h 1a d-! on light 30 cm deep soils at Quercus-Juniperus level and dolomitic soils at Cedrus-Quercus level. It was 5.5 kg ha-! d i- on colluvial soils at pure Quercus level and basaltic soil at lowgrass level Water balance and legume species abundance explained a great part of D.M. variance. Four cuts per year were more productive than three or five. Missing the earliest cuts resulted in much lower D.M. yields: a half with two cuts; three of five with an only cut per year. Shadow poorly reduced the yield up to a forest canopy cover of about 60%: from 35 to 65% cover, the canopy resulted in 30% fall in seasonal yield as water supply was not limiting, but had no effect as relative water deficit occurred. A pasture and forestry mixed system, aiming a canopy of 60 to 70% cover, would result in better conditions for cattle breeding and timber as a whole.</style></abstract></record></records></xml>