Search results for "forestry"

Über die Luftwurzeln von Oleandra

1951

Über Leitbündelisolierung in achsenartigen Organen

1949

Seventy-year changes in tree species composition and tree ages in state-owned forests in Latvia

2011

Abstract During the last 100 years, forest management in Latvia has gradually become more and more focused on industrial logging, which can be expected to have affected the tree species composition and age distribution across the landscape. These changes need to be considered in forest management and conservation of biological diversity. The aim of the study was to use forest records to reconstruct the tree species composition and age distribution in the North Vidzeme Biosphere Reserve in northern Latvia for the period, 1929–1941. These data were compared to a data-set from 2008, to determine the changes that transpired during a period of intensification of forest management. The silvicultu…

Dry years and their relationship to crop production in Sri Lanka

1981

Drought is a distinct agroclimatological hazard with far reaching consequences upon crop production. Among them, famines are regarded the most serious effects of climatological drought. Although there is no doubt about the principally valid relationship between drought and production losses it seems more problematic how this relationship can be proved statistically. In this paper annual rainfall data and production figures of the three major crops of Sri Lanka, rice (paddy), tea and rubber, are correlated, but only partially a true relationship between dry years and production losses could be observed. Reason for this may be the moderate degree of annual drought. From the results shown, the…

Application of artificial neural networks and logistic regression to the prediction of forest fire danger in Galicia using MODIS data

2012

Fire danger models are a very useful tool for the prevention and extinction of forest fires. Some inputs of these models, such as vegetation status and temperature, can be obtained from remote sensing images, which offer higher spatial and temporal resolution than direct ground measures. In this paper, we focus on the Galicia region (north-west of Spain), and MODIS (Moderate Resolution Imaging Spectroradiometer) images are used to monitor vegetation status and to obtain land surface temperature as essential inputs in forest fire danger models. In this work, we tested the potential of artificial neural networks and logistic regression to estimate forest fire danger from remote sensing and f…

Evaluating fish assemblages associated with gas platforms: Evidence from a visual census technique and experimental fishing surveys

2010

Fish assemblages associated with extractive platforms were surveyed, for the first time, using traditional fishing surveys (bottom gill net) and an underwater visual census (UVC) technique in order to test the effectiveness and to identify strengths and weaknesses of both methods. The study was carried out during three seasons at two offshore gas platforms (Eleonora and Squalo C) located in the central Adriatic Sea. Both methods recorded a similar number of fish species although with only eight species in common, thus supplying complementary information and a good estimate of the total fish species richness (39) associated with these gas platforms. The use of innovative techniques, such as …

Persepsi Masyarakat Lokal Terhadap Pengembangan Hutan Mangrove Sebagai Kawasan Ekowisata Di Kampung Ruar Distrik Biak Timur Kabupaten Biak Numfor

2021

The mangrove forest area of ​​Kampung Ruar, East Biak District, is an area that has traditionally been a place for fishing and lime-making efforts by the community who have been hereditary. This condition raises questions from various parties whether this location is suitable to be developed as a mangrove ecotourism destination. Development of Mangrove Ecotourism by the Papua Provincial Forestry Service as a tourist attraction by utilizing local natural potential and supporting tourism policies in Biak Numfor Regency. This study aims to see the socio-cultural conditions of local communities in the Mangrove Forest Area of ​​Kampung Ruar, Biak Timur District, Biak Numfor Regency as an ecotour…

Sparassidae in China 2. Species from the Collection in Changchun (Arachnida: Araneae)

2002

Epidemiology of sharka disease in Spain

2006

Le PPV a ete detecte pour la premiere fois en Espagne en 1984 sur des pruniers japonais (Prunus salicina Lind1) cv. Red Beaut et s'est dissemine tres rapidement a d'autres cultivars de pruniers et d'abricotiers japonais et europeens tout en epargnant les cultivars de pechers. Dans les annees suivant la detection du PPV, l'espece de puceron predominante qui visitait les vergers de Prunus dans les regions mediterraneennes etait Aphis gossypii suivie par Aphis spiraecola, cette derniere etant la principale espece de puceron trouvee actuellement. Les deux especes sont considerees comme les principaux vecteurs du PPV dans les regions de culture de Prunus precoces. Une analyse spatiale de la diss…

A survey of the orophilous shrubby vegetation of the Teide (Tenerife, Canary Islands)

2008

A survey about the orophilous shrubby vegetation of the Teide volcano (Tenerife) is provided, based on literature and unpublished data. The investigated communities are dominated by broom-shaped nanophanerophytes, chamaephytes and hemicryptophytes, well adapted to the climatic continentality characterizing their growing-sites, due to the localization above the cloud layer. From the syntaxonomical point of view, in this paper is proposed to refer this vegetation to the class Cytiso-Pinetea canariensis Rivas Goday & Esteve ex Sunding 1972, to the order Spartocytisetalia supranubii Schonfelder & Voggenreiter 1994 and to three alliances: Spartocytision supranubii Oberd. ex Esteve 1973, grouping…