scholarly journals Forecast of Growth and Development of Modal Fir Stands in the Lower Angara Region

2020 ◽  
Author(s):  
Pavel Mikhaylov Mikhaylov ◽  
Svetlana Sultson ◽  
Andrey Goroshko
Keyword(s):  
Forest Fires ◽  
Growth And Development ◽  
Insect Pests ◽  
Growth Dynamics ◽  
Forest Growth ◽  
Point Of View ◽  
Forest Site ◽  
Stand Growth ◽  
The Best Approximation ◽  
Small Standard Error

The paper presents an assessment of the growth dynamics of the modal fir plantations in the Lower Angara region. At present, a vast area of fir forests in the Lower Angara region is characterised by a significant decrease in sustainability due to periodic forest fires, insect pests outbreaks and diseases, which lead to their natural degradation and death. However, the intensity of coniferous stand growth in certain forest site characteristics persists in the long term. Therefore, creating regression models of forest growth and development involving the identification of site conditions is very important both from a practical point of view and for environmental monitoring. The materials of the mass inventory of 3491 stands served as the initial data for studying the processes of fir plantations natural growth. The Hoerl Model function is suitable for the best approximation of stand growth since it is characterised by high levelling factor (from 0.970 to 0.987) and a small standard error (not exceeding 7%). As a result of the research, there have been constructed sketches of the growth rate tables for the modal Siberian fir stands of the third bonitet class of the forb and mossy groups of forest types.

Le feu : agent de contrôle des insectes

1994 ◽  
Vol 70 (4) ◽  
pp. 468-472
Author(s):  
M. Martin Dupuis
Keyword(s):  
Forest Fires ◽  
Insect Pests ◽  
Weather Conditions ◽  
Fire Intensity ◽  
Fire Control ◽  
Fire Use ◽  
Wild Fire ◽  
Controlled Burning ◽  
Long Run ◽  
Evolution Understanding

For millenia, fire and insects have played an important role in forested land evolution. Understanding the roles they play can be important in helping us not only to control them, but to use them as an ecological tool. Also, we notice some important interactions between these two agents. As insects affect fire, fire may control insect pests. Controlled burning may provide excellent results, but allows a very slight margin for possible errors. Fire use as an insect mangement tool, requires a very precise and wide knowledge of weather conditions, fire intensity, insect's life cycle, available fuels, and type of ecosystem involved.After a long run of experiences and research, we notice that fire has been and will always be an important factor in equilibrium of some ecosystems. Since wild fire prevention campaigns and the emergence of insecticides, some forests have become excessively vulnerable to insect pests. Proper knowledge, and use of fire control, rather than immediate suppression of forest fires, would allow us to conserve various ecosystems in a healthy balance.

scholarly journals Forest stand growth dynamics in Central Europe have accelerated since 1870

2014 ◽  
Vol 5 (1) ◽  
Author(s):  
Hans Pretzsch ◽  
Peter Biber ◽  
Gerhard Schütze ◽  
Enno Uhl ◽  
Thomas Rötzer
Keyword(s):  
Central Europe ◽  
Growth Dynamics ◽  
Forest Stand ◽  
Stand Growth

scholarly journals Growth and vegetative development of soybean plants in soil type Concrectionary Petric Plinthosol

2019 ◽  
pp. 351
Author(s):  
Marcio Nikkel ◽  
Saulo De Oliveira Lima
Keyword(s):  
Soil Type ◽  
Growth And Development ◽  
Total Mass ◽  
Dry Matter ◽  
Point Of View ◽  
Depth Information ◽  
Economic Interest ◽  
Vegetative Development ◽  
Presence And Absence ◽  
Soybean Plants

The central-north of Brazil is a region with strong presence of concrectionary soil, whose supposed disadvantages from the agronomic point of view, do not prevent their use in agriculture. However, more in-depth information about the behavior of crops of agricultural interest cultivated in this type of soil is few. Due to the observation of agricultural stands in this type of soil, it was hypothesized that plinthite ironstones concretions negatively interfere in the development of crops of agro-economic interest. The objective was to verify the growth and development of soybean cultivated in soil with the presence and absence of plinthite ironstones. Concretionary Petric Plinthosol were collected in the 0-0,20 m layer and part of the soil was sieved so that concretions larger than 3.10 mm in diameter were removed, thus leaving two treatments, soil with and without plinthite ironstones. Morphological evaluations were performed during their phenological phase. Soybean grown in soil without ironstones showed higher growth at 32 and 48 DAE and more leaflets when compared to soy crop grown in soil with ironstones. As for dry matter, soybean grown in soil without ironstones showed more values for aerial, root and total mass as well for aerial root rate when compared to soybean grown in soil with ironstones. Plinthite ironstones interfere with the growth and/or vegetative development of soybeans. Soybean has less vegetative development when grown in soil with plinthite ironstone concretions.

scholarly journals Populasi Serangga Hama dan Artropoda Predator pada Padi Rawa Lebak Sumatera Selatan yang Diaplikasikan Bioinsektisida dari Beauveria bassiana dan Insektisida Sintetik

2019 ◽  
Vol 8 (1) ◽  
pp. 31-38
Author(s):  
Khoirul Ikhsanudin Hanif ◽  
Siti Herlinda ◽  
Chandra Irsan ◽  
Tili Karenina ◽  
Erise Anggraini ◽  
...  
Keyword(s):  
Beauveria Bassiana ◽  
Growth And Development ◽  
Rice Field ◽  
Insect Pests ◽  
Pest Insect ◽  
Synthetic Insecticide ◽  
Freshwater Swamp ◽  
Pest Insects ◽  
Predatory Insects ◽  
Predatory Arthropods

Hanif et al, 2019. Population of Pest Insects and Predatory Arthropods Inhabiting Freshwater Swamp Rice of South Sumatra Treated with Bioinsectide of Beauveria bassiana and a Synthetic Insecticide. JLSO (8)1:31-38.Entomopathogenic fungi, Beauveria bassiana, could  kill various species of insect pests, but  their impact on predatory arthropods needs to be studied. The aim of this study was to compare population of pest insects and predatory arthropods inhabiting rice sprayed with bioinsecticide of B. bassiana and conventional rice field using a synthetic insecticides. Bioinsecticide was made from conidia of B. bassiana and sprayed on rice canopy. The plot of conventional farmers was sprayed with synthetic insecticides made from Abamektrin. The results showed that the application of bioinsecticide of B. bassiana was not proven to reduce the pest insect population. The abundance of natural enemies of pest insects, such as  spiders and predatory insects was also more abundant in plots sprayed with  bioinsecticide than conventional plots that used synthetic insecticide. The synthetic insecticides have been shown to reduce the abundance of predatory insects and spiders. Bioinsecticides containing carrier of  liquid compost were proven to increase the growth and development of rice, which was an increase in the number of rice tillers per clump in plots applied by bioinsecticide. Thus, B. bassiana of bioinsecticide with liquid compost carrier material was safer and could maintain the abundance of predatory arthropods and increased rice growth.

scholarly journals Preliminary study on the case of black rain in Rio Grande do Sul, Brazil: A synoptic point of view

2021 ◽  
Vol 14 (3) ◽  
pp. 1268
Author(s):  
Maicon Moraes Santiago ◽  
Gabriel Borges dos Santos ◽  
Iulli Pitone Cardoso ◽  
André Becker Nunes
Keyword(s):  
Forest Fires ◽  
General Circulation ◽  
Rio Grande ◽  
Reanalysis Data ◽  
Point Of View ◽  
Rio Grande Do Sul ◽  
The South ◽  
Low Level ◽  
Suspended Particulate ◽  
South Of Brazil

Particles of soot from forest fires are transported by the wind, reaching distant locations and being deposited on the soil through precipitation, which clears the atmosphere, taking suspended particulate matter into its drops. The general circulation over South America indicates the possibility of soot from forest fires in the Amazon and Pantanal to be transported to southern Brazil. The event called “black rain” was observed in the period from 11 to 13 September 2020 at São Francisco de Assis City, in Rio Grande do Sul State (RS), and so this work aims to analyze if there were any anomalies of the flow that favored the occurrence of this event, given that there was a large number of fires in this period. Through ERA5 reanalysis data and GOES-16 satellite images, it was observed that on the three days under study low-level flow to the south of Brazil was more intense than normal, with the Low Level Jet occurrences, and on days 12 and 13 such flow to the south was also observed at 500 hPa. The precipitation was due to the instability of an extended trough from the Northwestern Argentinean Low. Thus, it is believed that there was a contribution from circulation at low and mid levels in the occurrence of black rain over RS.

scholarly journals A Comparison of Growth and Development of Three Major Agricultural Insect Pests Infected with Heliothis virescens ascovirus 3h (HvAV-3h)

PLoS ONE ◽  
2013 ◽  
Vol 8 (12) ◽  
pp. e85704 ◽  
Author(s):  
Shun-Ji Li ◽  
Xing Wang ◽  
Zhong-Shi Zhou ◽  
Jie Zhu ◽  
Jue Hu ◽  
...  
Keyword(s):  
Heliothis Virescens ◽  
Growth And Development ◽  
Insect Pests ◽  
Heliothis Virescens Ascovirus

FOREIGN TRADE IN FOREST PRODUCTS FROM A POINT OF VIEW OF AN EXPORTING COUNTRY—CANADA

1962 ◽  
Vol 38 (1) ◽  
pp. 56-62
Author(s):  
Harold M. Babcock
Keyword(s):  
Political Influence ◽  
Forest Products ◽  
Forest Growth ◽  
Point Of View ◽  
Economic Diversification ◽  
Traditional Markets ◽  
Forest Policies ◽  
Pros And Cons ◽  
Significant Measure ◽  
Scattered Population

Although Canada has been blessed with an abundant store house of natural resources and enjoys a significant measure of economic and political influence throughout the world, she has a relatively small and widely scattered population. The Canadian economy is largely based on resource industries of which those producing forest products are outstanding, and the very economic existence of Canada is dependent upon her ability to export goods and services.Some of the more critical export problem areas include non-resident ownership, the wage-cost spiral, the loss of traditional markets in forest products and finally the problems associated with researching markets in foreign countries.A matter of concern to many is the lack of investment in Canada's forests although the forest resource is capable of sustaining several times present production. Most disturbed lands regenerate naturally, but not necessarily in the desired species. The questions to be asked by management foresters are: (1) should we concentrate on the production of wood fibre or, (2) should we stress the growing of known species of superior quality? The pros and cons of each of these widely divergent forest policies are easily argued.Lack of an internal market is incurable over the short term; but Canada's immigration policies, her participation in trade conferences, agreements and international organizations, and her attempts at economic diversification all help to alleviate problems associated with her dependency on foreign markets.The results of these actions coupled with a trend toward equalization between forest growth and utilization will provide the necessity and incentive for a stepped up forest investment program in Canada.

scholarly journals Insights into the Toxicity and Degradation Mechanisms of Imidacloprid Via Physicochemical and Microbial Approaches

Toxics ◽  
2020 ◽  
Vol 8 (3) ◽  
pp. 65
Author(s):  
Shimei Pang ◽  
Ziqiu Lin ◽  
Yuming Zhang ◽  
Wenping Zhang ◽  
Nasser Alansary ◽  
...  
Keyword(s):  
Large Scale ◽  
Insect Pests ◽  
Point Of View ◽  
Emerging Contaminant ◽  
Human Beings ◽  
Degradation Mechanisms ◽  
The World ◽  
Neonicotinoid Insecticide ◽  
The Central Nervous System ◽  
Control Insect

Imidacloprid is a neonicotinoid insecticide that has been widely used to control insect pests in agricultural fields for decades. It shows insecticidal activity mainly by blocking the normal conduction of the central nervous system in insects. However, in recent years, imidacloprid has been reported to be an emerging contaminant in all parts of the world, and has different toxic effects on a variety of non-target organisms, including human beings, due to its large-scale use. Hence, the removal of imidacloprid from the ecosystem has received widespread attention. Different remediation approaches have been studied to eliminate imidacloprid residues from the environment, such as oxidation, hydrolysis, adsorption, ultrasound, illumination, and biodegradation. In nature, microbial degradation is one of the most important processes controlling the fate of and transformation from imidacloprid use, and from an environmental point of view, it is the most promising means, as it is the most effective, least hazardous, and most environmentally friendly. To date, several imidacloprid-degrading microbes, including Bacillus, Pseudoxanthomonas, Mycobacterium, Rhizobium, Rhodococcus, and Stenotrophomonas, have been characterized for biodegradation. In addition, previous studies have found that many insects and microorganisms have developed resistance genes to and degradation enzymes of imidacloprid. Furthermore, the metabolites and degradation pathways of imidacloprid have been reported. However, reviews of the toxicity and degradation mechanisms of imidacloprid are rare. In this review, the toxicity and degradation mechanisms of imidacloprid are summarized in order to provide a theoretical and practical basis for the remediation of imidacloprid-contaminated environments.

scholarly journals Maintenance of long-term experiments for unique insights into forest growth dynamics and trends: review and perspectives

2018 ◽  
Vol 138 (1) ◽  
pp. 165-185 ◽  
Author(s):  
Hans Pretzsch ◽  
Miren del Río ◽  
Peter Biber ◽  
Catia Arcangeli ◽  
Kamil Bielak ◽  
...  
Keyword(s):  
Growth Dynamics ◽  
Forest Growth ◽  
Long Term Experiments

scholarly journals A high-resolution spatial assessment of the impacts of drought variability on vegetation activity in Spain from 1981 to 2015

2019 ◽  
Vol 19 (6) ◽  
pp. 1189-1213 ◽  
Author(s):  
Sergio M. Vicente-Serrano ◽  
Cesar Azorin-Molina ◽  
Marina Peña-Gallardo ◽  
Miquel Tomas-Burguera ◽  
Fernando Domínguez-Castro ◽  
...  
Keyword(s):  
High Resolution ◽  
Forest Fires ◽  
Vegetation Index ◽  
Normalized Difference Vegetation Index ◽  
Temporal Variations ◽  
Forest Growth ◽  
Dominant Factor ◽  
Drought Severity ◽  
Vegetation Types ◽  
Vegetation Activity

Abstract. Drought is a major driver of vegetation activity in Spain, with significant impacts on crop yield, forest growth, and the occurrence of forest fires. Nonetheless, the sensitivity of vegetation to drought conditions differs largely amongst vegetation types and climates. We used a high-resolution (1.1 km) spatial dataset of the normalized difference vegetation index (NDVI) for the whole of Spain spanning the period from 1981 to 2015, combined with a dataset of the standardized precipitation evapotranspiration index (SPEI) to assess the sensitivity of vegetation types to drought across Spain. Specifically, this study explores the drought timescales at which vegetation activity shows its highest response to drought severity at different moments of the year. Results demonstrate that – over large areas of Spain – vegetation activity is controlled largely by the interannual variability of drought. More than 90 % of the land areas exhibited statistically significant positive correlations between the NDVI and the SPEI during dry summers (JJA). Nevertheless, there are some considerable spatio-temporal variations, which can be linked to differences in land cover and aridity conditions. In comparison to other climatic regions across Spain, results indicate that vegetation types located in arid regions showed the strongest response to drought. Importantly, this study stresses that the timescale at which drought is assessed is a dominant factor in understanding the different responses of vegetation activity to drought.

Sign in / Sign up

Export Citation Format

Share Document