scholarly journals Identification of Climatic and Soil Biocenotic Factors Influencing the Height Growth of Lapland Pine in North European Russia

2021 ◽  
Author(s):  
Elena Popova ◽  
Anna E. Koukhta ◽  
Igor O. Popov
Keyword(s):  
Cluster Analysis ◽  
Climatic Factors ◽  
Growth Period ◽  
Height Growth ◽  
Early Summer ◽  
European Russia ◽  
Climatic Parameters ◽  
Growth Indices ◽  
The North ◽  
Pine Trees

Abstract Background: Lapland pine (Pinus sylvestris ssp. lapponica Fr. ex Hartm) is the geographical and climatic ecotype and subspecies of Scots pine. It is widespread in the north of Eurasia. Height growth is interconnected with both climatic parameters and the state of the habitat of pine trees. Methods: Long-term data on height growth indices of Lapland pine (var. nana Pallas (1784)), growing in various humid biogeocenoses of three specially protected natural territories of the North European part of Russia were studied. Also sixteen basic climatic parameters averaged over the growth period of the examined trees were calculated for these regions. The comparison of the values of both different climatic parameters and the height growth of pine stands of various biogeocenoses was made by the method of cluster analysis. Results: It was established that climatic parameters such as the mean daily average temperature in January and the amount of precipitation in the spring and early summer periods had a primary influence on the cluster similarity of the height growth of Lapland pine in the North European Russia. The proximity of soil and biocenotic conditions also influenced the similarity of height growth indices of Lapland pine, but had a lower rank within the two main clusters, distinguished by climatic values. Conclusion: Our studies showed that it is possible to identify the rank influence of the most significant climatic factors and soil-biocenotic conditions on the height growth of the geographical ecotype Lapland pine subspecies with the cluster analysis.

THE NORMALIZED DIFFERENCE VEGETATION INDEX AS AN INDICATOR OF DYNAMICS

2021 ◽  
Author(s):  
Haddad Amar ◽  
Beldjazia Amina ◽  
Kadi Zahia ◽  
Redjaimia Lilia ◽  
Rached-Kanouni Malika
Keyword(s):  
Vegetation Index ◽  
Normalized Difference Vegetation Index ◽  
Climatic Factors ◽  
Mediterranean Ecosystems ◽  
Point Of View ◽  
Aleppo Pine ◽  
Landsat 8 ◽  
North East ◽  
The North ◽  
Pine Trees

Mediterranean ecosystems are considered particularly sensitive to climate change. Any change in climatic factors affects the structure and functioning of these ecosystems and has an influence on plant productivity. The main objective of this work is to characterize one of the Mediterranean ecosystems; the Chettaba forest massif (located in the North-East of Algeria) from a vegetation point of view and their link with monthly variations using Landsat 8 satellite images from five different dates (June 25, 2017, July 27, 2017, August 28, 2017, October 15, 2017). The comparison of NDVI values in Aleppo pine trees was performed using analysis of variance and the use of Friedman's non-parametric test. The Mann-Kendall statistical method was applied to the monthly distribution of NDVI values to detect any trends in the data over the study period. The statistical results of NDVI of Aleppo pine trees indicate that the maximum value is recorded in the month of June, while the lowest values are observed in the month of August where the species studied is exposed to periods of thermal stress.

scholarly journals Seasonal Growth of Scots Pine under the Conditions of Water-Logged Soils of the North

2021 ◽  
pp. 86-100
Author(s):  
Liliya V. Zarubina ◽  
◽  
Renat S. Khamitov
Keyword(s):  
Scots Pine ◽  
Shoot Growth ◽  
Height Growth ◽  
Pine Forests ◽  
Forest Site ◽  
Seasonal Growth ◽  
Peat Soils ◽  
The North ◽  
Physiological Processes ◽  
Pine Trees

The seasonal rhythm of height growth of young shoots of Scots pine growing in a 33-year-old shrubby-sphagnum pine forest of the northern taiga natural-climatic zone has been studied in a complex with the main physiological processes. The possibility of regulating their intensity by additional introduction of nitrogen fertilizer has been determined. It has been found that on hydromorphic excessively wet soils of the North, seasonal height growth of pine occurs with a maximum rate in late June and early July, when air temperature rises and the root system is released from excessive moisture. Unlike lichen pine forests, in which pine roots are not affected by flooding, on hydromorphic peat soils pine grows much slower and during the growing season has less intensive physiological processes. The low rate of shoot growth and physiological processes in pine in sphagnum forest site conditions is explained by dysfunction of its root system as a result of soil anoxia caused by flooding, as well as by insufficient supply of growing shoots with acronutrients from the crown as a result of violation of their normal outflow and movement in the tree. Nitrogen fertilizers positively affect growth and physiological processes in pine trees in sphagnum forest types. However, their effect in these forest site conditions is much weaker than in the dry lichen forests of the Far North. On water-logged peat soils under the influence of nitrogen fertilizer seasonal height growth of pine trees increases by 20 %, the duration of seasonal shoot growth increases by 8–10 days, the intensity of photosynthesis increases significantly, and, as a result of reduced water onsumption for transpiration, the tree water regime normalizes and the transpiration productivity increases. These positive nitrogen-induced changes ultimately improve the viability and productivity of sphagnum pine forests. For citation: Zarubina L.V., Khamitov R.S. Seasonal Growth of Scots Pine under the Conditions of Water-Logged Soils of the North. Lesnoy Zhurnal [Russian Forestry Journal], 2021, no. 3, pp. 86–100. DOI: 10.37482/0536-1036-2021-3-86-100

scholarly journals Еdapho-climatic characteristics of Рrecarpathian biotopes with the participation of price populations of species of the genus Рolygonatum Мill.

2021 ◽  
pp. 245-250
Author(s):  
N. I. Riznychuk ◽  
M. M. Mylenka ◽  
O. V. Babak
Keyword(s):  
Cluster Analysis ◽  
Moisture Content ◽  
Climatic Factors ◽  
Humus Content ◽  
Dominant Factor ◽  
Climatic Parameters ◽  
Abiotic Conditions ◽  
Light Levels ◽  
Climatic Characteristics ◽  
Sum Of Active Temperatures

Grouping of research sites according to the set of analyzed edapho-climatic parameters by the method of cluster analysis showed that the dominant factor in the formation of abiotic conditions is the type of habitat. Therefore, characterized the population and ecological characteristics of species of the genus Polygonatum Mill. in the Precarpathians by analyzing the key edapho-climatic factors of the studied habitats, namely the humus content, acidity, moisture content, the sum of active temperatures, light levels and N, P, K.

Assessment of the Reactions of Algal Communities to Influence of Climatic Factors in the North-Western Black Sea Ecosystem

2018 ◽  
Vol 20 (2) ◽  
pp. 121-134 ◽  
Author(s):  
G. G. Minicheva ◽  
V. N. Bolshakov ◽  
E. S. Kalashnik ◽  
A. B. Zotov ◽  
A. V. Marinets
Keyword(s):  
Black Sea ◽  
Climatic Factors ◽  
Algal Communities ◽  
The North ◽  
North Western

scholarly journals Provenance Trials of the Mexican Spruces in Nursery Conditions: Three Species Endangered by Climatic Variation

2020 ◽  
Vol 3 (1) ◽  
pp. 12
Author(s):  
José Marcos Torres-Valverde ◽  
José Ciro Hernández-Díaz ◽  
Artemio Carrillo-Parra ◽  
Eduardo Mendoza-Maya ◽  
Christian Wehenkel
Keyword(s):  
Cluster Analysis ◽  
Genetic Differentiation ◽  
Local Adaptation ◽  
Quantitative Traits ◽  
Climatic Factors ◽  
Climatic Variation ◽  
Climatic Variables ◽  
Provenance Trials ◽  
Survival And Growth ◽  
Picea Species

The three Mexican spruces’ distributions are fragmented, which could lead to phenological, morphological and genetic differentiation, partially caused by local adaptation. In this study, we examined the effect that climatic variables had on the survival and growth of 5641 Picea seedlings, coming from eight seed provenances of three species and produced in identical nursery conditions. The respective responses of each species and provenance can be considered as a proxy of the genetic differentiation and adaptation of each population. A cluster analysis revealed: (i) significant differences in genetic quantitative traits among the three Picea species and (ii) significant correlations between genetic quantitative traits and climatic factors.

scholarly journals Assessing the Sensitivity of Main Crop Yields to Climate Change Impacts in China

Atmosphere ◽  
2021 ◽  
Vol 12 (2) ◽  
pp. 172
Author(s):  
Yuan Xu ◽  
Jieming Chou ◽  
Fan Yang ◽  
Mingyang Sun ◽  
Weixing Zhao ◽  
...  
Keyword(s):  
Climate Change ◽  
Crop Yield ◽  
Food Production ◽  
Crop Yields ◽  
Climatic Factors ◽  
Climatic Data ◽  
The South ◽  
The North ◽  
Output Elasticity ◽  
The Impact

Quantitatively assessing the spatial divergence of the sensitivity of crop yield to climate change is of great significance for reducing the climate change risk to food production. We use socio-economic and climatic data from 1981 to 2015 to examine how climate variability led to variation in yield, as simulated by an economy–climate model (C-D-C). The sensitivity of crop yield to the impact of climate change refers to the change in yield caused by changing climatic factors under the condition of constant non-climatic factors. An ‘output elasticity of comprehensive climate factor (CCF)’ approach determines the sensitivity, using the yields per hectare for grain, rice, wheat and maize in China’s main grain-producing areas as a case study. The results show that the CCF has a negative trend at a rate of −0.84/(10a) in the North region, while a positive trend of 0.79/(10a) is observed for the South region. Climate change promotes the ensemble increase in yields, and the contribution of agricultural labor force and total mechanical power to yields are greater, indicating that the yield in major grain-producing areas mainly depends on labor resources and the level of mechanization. However, the sensitivities to climate change of different crop yields to climate change present obvious regional differences: the sensitivity to climate change of the yield per hectare for maize in the North region was stronger than that in the South region. Therefore, the increase in the yield per hectare for maize in the North region due to the positive impacts of climate change was greater than that in the South region. In contrast, the sensitivity to climate change of the yield per hectare for rice in the South region was stronger than that in the North region. Furthermore, the sensitivity to climate change of maize per hectare yield was stronger than that of rice and wheat in the North region, and that of rice was the highest of the three crop yields in the South region. Finally, the economy–climate sensitivity zones of different crops were determined by the output elasticity of the CCF to help adapt to climate change and prevent food production risks.

TEMPERATURE IN RELATION TO THE TRANSMISSION AND PATHOGENICITY OF WHEAT STRIATE MOSAIC VIRUS

1964 ◽  
Vol 42 (9) ◽  
pp. 1123-1133 ◽  
Author(s):  
J. T. Slykhuis ◽  
P. L. Sherwood
Keyword(s):  
Mosaic Virus ◽  
Incubation Period ◽  
Spring Wheat ◽  
Early Summer ◽  
Wheat Seedlings ◽  
Acquisition Access Period ◽  
The North ◽  
Different Temperatures ◽  
North American Type ◽  
Test Plants

Endria inimica Say acquired the North American type of wheat striate mosaic virus during periods of 15 minutes or longer on diseased plants held at five constant temperatures ranging from 10 to 33 °C. When infective insects were given inoculation access periods varying from 1 to 4 days at different temperatures, the percentage of test plants infected increased with temperature from 12.5% at 10° to 81.4% at 33 °C. After an acquisition access period of 2 days at 24 °C, insects kept at 8 or 10 °C did not transmit virus, but the percentage of others that transmitted at successively higher temperatures increased from 3.3% at 16 °C to 73.3% at 33 °C. The preinfective period was more than 29 days for insects kept at 16 °C and only 5 days for some kept at 27, 30, and 33 °C. The average preinfective period was 11 days at 20 °C, but decreased to 6.4 days as temperature increased to 33 °C. The percentage of test plants that became infected increased from 0.1% at 16 °C to 44.3%, at 33 °C. Stewart and Ramsey wheat seedlings exposed to infective E. inimica for 2 days did not develop symptoms during a subsequent 60 day period at 10 °C. After the same plants were placed in a greenhouse at 20–25 °C, 26% and 27%, respectively, developed symptoms. The incubation period for symptoms in plants ranged from 17 to more than 62 days at 16 °C. It decreased as temperature increased but varied from 6 to 25 days at 30 °C. Forty-two and 48% of Stewart and Ramsey wheat plants respectively, developed symptoms at 16 °C, and increased to almost 100% for both varieties at 30 and 33 °C. The above results indicate that high temperatures during early summer are prerequisite for severe epidemics of wheat striate mosaic in spring wheat.

scholarly journals “Why (Should) I Do Something for the Environment?” Profiles of Flemish Adolescents’ Motivation Toward the Environment

2018 ◽  
Vol 10 (7) ◽  
pp. 2579 ◽  
Author(s):  
Wanda Sass ◽  
Jelle Pauw ◽  
Vincent Donche ◽  
Peter Petegem
Keyword(s):  
Cluster Analysis ◽  
Factor Analysis ◽  
Secondary School ◽  
Secondary School Students ◽  
School Students ◽  
The North ◽  
Dutch Translation ◽  
Confirmatory Factor ◽  
Senior Secondary ◽  
Person Centered Approach

The Motivation Toward the Environment Scale (MTES), developed in Canada, measures people’s self-determined motivation for doing something for the environment. Answering the call by its original developers, this study further validated the MTES within a sample of 779 Dutch-speaking senior secondary school students, aged 17 to 19, in the north of Belgium. More specifically, reliability and construct validity of a Dutch translation of the MTES were verified. To this measure, confirmatory factor analysis was used, and the hypothesized simplex structure was tested through correlation analyses. Results confirmed the reliability of the MTES and a five-scale version of the MTES, excluding identified motivation, is introduced. This variable-centered approach was complemented by the adoption of a person-centered approach for identifying MTES profiles. Using cluster analysis, four meaningful MTES profiles emerged, with amotivation scoring medium to high in all but one. Theoretical implications of the findings and suggestions for interventions and further research are discussed.

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