Caracterización fitoclimática de procedencias de encinar (Quercus ilex L. subsp. ballota (Desf.) Samp. y Quercus ilex L. subsp. ilex) en el centro-norte peninsular

This paper presents some contributions to the phytoclimatic characterization of stands of holm-oak (Quercus ilex. L.) in the centre-north of the Iberian Peninsula and the testing of a method of phytoclimatic homologation applicable to the characterization of provenances of the species. For the phytoclimatic characterization, 432 sampling points in the Province of Burgos were considered, corresponding to the centres of cartographic tessellae of actual vegetation in which holm-oak was the principle species of the forest (18,965 ha). The phytoclimatic diagnosis followed the phytoclimatic models of Allué-Andrade. Phytoclimatic territorial models were constructed in digital format on the basis of preliminary territorial factorial estimations, which were used to determine phytoclimatic terns. Based on the establishment of phytoclimatic ambits for the existence of holm-oak stands in Burgos and stratification in accordance with the five phytoclimatic subtypes (VI(IV)1, VI(IV)2, VI(VII), VI(V) and VI), phytoclimatic homologation was performed in three phases of increasing strictness, all based on a comparison of phytoclimatic terns derived from the general and specific phytoclimatic systems. In the strictest homologation, an adequate and territorially compact degree of discrimination was achieved for 2.622.500 ha (Quercus ilex subsp. ballota) and 116.00 ha (Quercus ilex subsp. ilex) in the centre-north of the Iberian Peninsula. The marked edaphic azonality of the species was an important factor in the interpretation of the results.En el presente trabajo se efectúan aportaciones a la caracterización fitoclimática de encinares de Quercus ilex L. en el centro-norte peninsular y se ensaya un método de homologación fitoclimática aplicable a la caracterización de procedencias de la especie, diferenciando en el estudio la subespecie ilex de la subespecie ballota. Para la caracterización fitoclimática se consideraron 432 puntos de muestreo en la provincia de Burgos, correspondientes a los centros de las teselas cartográficas de vegetación real en las que la encina es la especie principal del vuelo (18.965 has). La diagnosis fitoclimática se realizó conforme a los modelos fitoclimáticos de Allué-Andrade (1990), mediante la confección de bases territoriales fitoclimáticas en formato digital basadas en estimaciones factoriales previas que permitiesen la determinación de ternas de diagnosis fitoclimática. Los puntos centrales de las teselas de encina en la provincia de Burgos se corresponden con 5 subtipos fitoclimáticos: VI(IV)1, VI(IV)2, VI(VII), VI(V) y VI, de los que casi la mitad (205) se encuentran en el subtipo VI(IV)1. La homologación fitoclimática se realizó en tres fases de exigencia creciente, basadas en la comparación de ternas fitoclimáticas. En la homologación más exigente, consistente en igualdad de terna y exigencia adicional de escalares genuinos y valores factoriales interiores a los respectivos ámbitos escalares y factoriales de los puntos origen, se obtuvo una superficie de homologación de 2.622.500 has para la subespecie ballota y 116.100 has para la subespecie ilex. Los resultados de este estudio sugieren la marcada azonalidad edáfica de buena parte de los encinares de Burgos como condicionante en la interpretación y aplicación práctica de los resultados

140 ans d'aménagement forestier en Espagne.

Cite les principaux faits historiques qui sont à l'origine de la mise en place et des premiers pas de l'aménagement forestier en Espagne pendant la deuxième moitié du XIXè siècle, ainsi que l'évolution au cours du XXè siècle et son état actuel. Si le bilan de ces 140 ans de pratique d'aménagement est globalement très positif, il reste cependant à combler d'importantes lacunes notamment en ce qui concerne les forêts issues de reboisements, ainsi qu'en ce qui concerne les méthodes de conversion fortement conditionnées par des facteurs sociaux et saisonniers surtout dans les forêts feuillues méditerranéennes souvent dégradées

140 ans d'aménagement forestier en Espagne.

International audienceCite les principaux faits historiques qui sont à l'origine de la mise en place et des premiers pas de l'aménagement forestier en Espagne pendant la deuxième moitié du XIXè siècle, ainsi que l'évolution au cours du XXè siècle et son état actuel. Si le bilan de ces 140 ans de pratique d'aménagement est globalement très positif, il reste cependant à combler d'importantes lacunes notamment en ce qui concerne les forêts issues de reboisements, ainsi qu'en ce qui concerne les méthodes de conversion fortement conditionnées par des facteurs sociaux et saisonniers surtout dans les forêts feuillues méditerranéennes souvent dégradées

Actas de la 3. reunion sobre evolucion de ordenaciones historicas

Centro de Informacion y Documentacion Cientifica (CINDOC). C/Joaquin Costa, 22. 28002 Madrid. SPAIN / CINDOC - Centro de Informaciòn y Documentaciòn CientìficaSIGLEESSpai

The impact of surgical delay on resectability of colorectal cancer: An international prospective cohort study

The SARS-CoV-2 pandemic has provided a unique opportunity to explore the impact of surgical delays on cancer resectability. This study aimed to compare resectability for colorectal cancer patients undergoing delayed versus non-delayed surgery

The impact of surgical delay on resectability of colorectal cancer: An international prospective cohort study

AimThe SARS-CoV-2 pandemic has provided a unique opportunity to explore the impact of surgical delays on cancer resectability. This study aimed to compare resectability for colorectal cancer patients undergoing delayed versus non-delayed surgery.MethodsThis was an international prospective cohort study of consecutive colorectal cancer patients with a decision for curative surgery (January-April 2020). Surgical delay was defined as an operation taking place more than 4 weeks after treatment decision, in a patient who did not receive neoadjuvant therapy. A subgroup analysis explored the effects of delay in elective patients only. The impact of longer delays was explored in a sensitivity analysis. The primary outcome was complete resection, defined as curative resection with an R0 margin.ResultsOverall, 5453 patients from 304 hospitals in 47 countries were included, of whom 6.6% (358/5453) did not receive their planned operation. Of the 4304 operated patients without neoadjuvant therapy, 40.5% (1744/4304) were delayed beyond 4 weeks. Delayed patients were more likely to be older, men, more comorbid, have higher body mass index and have rectal cancer and early stage disease. Delayed patients had higher unadjusted rates of complete resection (93.7% vs. 91.9%, P = 0.032) and lower rates of emergency surgery (4.5% vs. 22.5%, P ConclusionOne in 15 colorectal cancer patients did not receive their planned operation during the first wave of COVID-19. Surgical delay did not appear to compromise resectability, raising the hypothesis that any reduction in long-term survival attributable to delays is likely to be due to micro-metastatic disease