Search results for "forest"
showing 10 items of 3780 documents
Effects of tilling methods on soil penetration resistance, organic carbon and water stable aggregates in a vineyard of semiarid Mediterranean environ…
2018
Tillage, especially in semiarid Mediterranean environment, enhances the mineralization process of soil organic matter (SOM) and, in turn, decreases aggregate stability. Furthermore, continuous tillage leads to the formation of plough pan beneath the tilled layer. In the present study, we investigated the effect of an innovative self-propelled machine (spading machine, SM) for shallow tillage on SOM, water stable aggregates (WSA) and soil penetration resistance (PR). Such effects were compared to those of chisel plough (CP), rotary tiller (RT) and no tillage (NT). Each tilling method was applied up to a depth of 15 cm, whereas in NT only a brush cutter was used for weed control. Soil analyse…
Tillage effects on yield and nitrogen fixation of legumes in Mediterranean conditions
2012
Published in Agron. J. 104:1459–1466 (2012) Posted online [DATE] doi:10.2134/agronj2012.0070 Copyright © 2012 by the American Society of Agronomy, 5585 Guilford Road, Madison, WI 53711. All rights reserved. No part of this periodical may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopying, recording, or any information storage and retrieval system, without permission in writing from the publisher. I agricultural practices that involve the use of agrochemicals such as fertilizers, pesticides, and herbicides have greatly increased the global food supply but often with detrimental effects on the environment, such as contamination of ground…
The impact of the age of vines on soil hydraulic conductivity in vineyards in eastern Spain
2017
Soil infiltration processes manage runoff generation, which in turn affects soil erosion. There is limited information on infiltration rates. In this study, the impact of vine age on soil bulk density (BD) and hydraulic conductivity (Ks) was assessed on a loam soil tilled by chisel plough. Soil sampling was conducted in the inter row area of six vineyards, which differed by the age from planting: 0 (Age 0; just planted), 1, 3, 6, 13, and 25 years (Age 1, Age 3, Age 6, Age 13, and Age 25, respectively). The One Ponding Depth (OPD) approach was applied to ring infiltration data to estimate soil Ks with an α* parameter equal to 0.012 mm-1. Soil bulk density for Age 0 was about 1.5 times greate…
Research on macrolepidoptera species (Insecta: Lepidoptera) collected in Dumbrava Sibului Forest (Romania) in conditions of the year 2011 and their s…
2012
Macrolepidoptera fauna of Sibiu and its surroundings is studied for over 124 years by the naturalists Saxons. The collected material is preserved in the form of individual collections at the Natural History Museum in Sibiu. In addition to our material collected by us since 2001, data from these collections were a valuable documentary material for the present work. Our considerations on Macrolepidoptera flight periods are based on research conducted during the year 2011 from March to November in the protected area Dumbrava Sibiului. The natural conditions and the characteristics of the investigated area were revealed in several previous articles that could be found in the reference list. Thi…
Lepidoptera (Insecta: Lepidoptera) in the collection of Daniel Czekelius from Natural History Museum of Sibiu, collected from "Dumbrava Sibiului" for…
2011
Currently, fauna and ecological analysis of the landscape in which the reserves and Forest "Dumbrava Sibiu" shows a great scientific interest and practical for biological research in Sibiu. The results can contribute substantially to assessing the state of the world of insects and their evolution in the ecosystem studied, but also to establish their quantitative and qualitative changes over time. In the present work was studied the Lepidoptera collection of Transylvania Dr. Daniel Czekelius, and the paper presents a systematic list of species collected Macrolepidoptere since 1888-1929 in Forest "Dumbrava Sibiu".This paper can be considered a tribute and memory of Dr.Daniel Czekelius entomol…
Monitoraggio del contenuto idrico del suolo in un versante calanchivo in Sicilia
2008
Cambiamenti climatici, selvicoltura e popolamenti a rischio
2014
Il contributo prende in esame alcune criticità dei popolamenti al margine dell'areale di diffusione, in quanto soggetti a pressioni ecologiche a seguito del cambiamento climatico in atto. Si esaminano casi di studio e si indicano alcuni indirizzi colturali volti a ridurre gli stress e le criticità in atto
16. Ottimizzazione del campione dendrometrico
2009
Nell'ambito della redazione del Piano di Gestione della Riserva Naturale Statale biogenetica di Vallombrosa è stata condotta una sperimentazione volta a ottimizzare il tempo di rilievo e la dimensione del campione per il rilievo quantitativo dendrometrico. i risultati evidenziano che la migliore dimensione delle aree di saggio, di forma circolare, verificata sul CV dell'area basimetrica e nell'ottica di minimizzare i tempi di rilievo è pari a 1257 metri quadrati, ovvero un raggio di 20 metri lineari.
Verifica sperimentale di un campionatore per la misura della perdita di suolo
2014
Per la misura di perdita in suolo in parcelle attrezzate è necessaria la stima del peso del materiale solido intercettato nella loro sezione terminale. Nell’area sperimentale di Sparacia, i deflussi torbidi prodotti in seguito ad un evento erosivo vengono convogliati all’interno di vasche di accumulo della capacità di circa 1 m3. Nella memoria per misurare agevolmente il peso di materiale solido eroso da una parcella si propone l’estrazione di campioni rappresentativi della miscela torbida presente in ciascuna vasca facendo uso di un nuovo campionatore appositamente predisposto. La verifica di funzionamento del campionatore è stata condotta effettuando due distinte seri di prove finalizzate…
A microcosm experiment to evaluate the influence of location and quality of plant residues on residue decomposition and genetic structure of soil mic…
2007
The effects of location (soil surface vs. incorporated in soil) and nature of plant residues on degradation processes and indigenous microbial communities were studied by means of soil microcosms incubation in which the different soil zones influenced by decomposition i.e. residues, soil adjacent to residues (detritusphere) and distant soil unaffected by decomposition (bulk soil) were considered. Plant material decomposition, organic carbon assimilation by the soil microbial biomass and soil inorganic N dynamics were studied with 13 C labelled wheat straw and young rye. The genetic structure of the community in each soil zone were compared between residue locations and type by applying B- a…