INFLUENCE OF THE SOIL RECLAMATION PLANTS ON THE FOREST VEGETATIVE PROPERTIES OF SOIL AND GROWTH OF THE CROPS OF PINUS SYLVESTRIS IN THE PINE FOREST CONDITIONS

10.12737/3824 ◽  
2014 ◽  
Vol 9 (1) ◽  
pp. 122-125
Author(s):  
Лежнин ◽  
Konstantin Lezhnin ◽  
Карасев ◽  
Valeriy Karasev ◽  
Карасева ◽  
...  
Keyword(s):  
Scots Pine ◽  
Sandy Loam ◽  
Organic Content ◽  
Dry Forest ◽  
Soil Reclamation ◽  
Nitrogen Fixing ◽  
Effective Measure ◽  
Physiological Processes ◽  
Forest Conditions ◽  
Common Juniper

Biological reclamation by plants with nitrogen-fixing symbionts and enriching the soil with organic substances is an urgent problem for the Republic of Mari El, where sod -podzolic loam, sandy loam and sandy soils with low organic content, nitrogen and other important elements was expanded. The feasibility of establishing a pine culture with the introduction of soil-improving plants was noted by many researchers, but their impact on the effectiveness of silvicultural properties of the soil, physiological processes and growth are poorly understood. In this paper we evaluated the influence of soil reclamation plants on silvicultural properties of soils, the intensity of the basic physiological processes and growth index of Scots pine. According to research, the perspective and cost-effective measure for improving the fertility of poor sandy coniferous soil, improving resilience and productivity of pine plantations is the introduction of the common juniper and soil reclamation plants with nitrogen-fixing symbionts, such as Russian broom, perennial lupine. When choosing the plants we should recognize its water regime. At the conditions of sufficient moisture it is suitably administered to the cultures of Scots pine, common juniper and perennial lupine. In the dry forest conditions the most effective is an introduction the culture of Scots pine, Russian broom. At the same time, the porosity of the soil increases from 47 to 52% and the content of humus and nitrogen by rises to18-20%.

scholarly journals Evaluation of the efficacy of neonicotinoid and pyrethroid insecticides in Diaphorina citri Kuwayama (Hemiptera: Liviidae) populations in Colombia

2018 ◽  
Vol 12 (2) ◽  
pp. 358-368
Author(s):  
Augusto Ramírez-Godoy ◽  
Gina Puentes-Pérez ◽  
Hermann Restrepo-Díaz
Keyword(s):  
Tropical Dry Forest ◽  
Dry Forest ◽  
Asian Citrus Psyllid ◽  
Insect Vector ◽  
Diaphorina Citri ◽  
Pyrethroid Insecticides ◽  
Lambda Cyhalothrin ◽  
The Mean ◽  
Number Of Individuals ◽  
Forest Conditions

The Asian citrus psyllid Diaphorina citri is the insect vector of the disease known as huanglongbing (HLB), which is the most devastating disease of citrus crops in the world. The Asian citrus psyllid was officially reported in Colombia in 2007, and a national phytosanitary emergency was declared because of the presence of HLB in 2015. Two different experiments were carried out in two locations (Apulo and Jerusalén, Department of Cundinamarca) in Colombia to evaluate the effectiveness of neonicotinoid (clothianidin, imidacloprid and thiamethoxan) and pyrethroid applications (bifenthrin, deltamethrin and lambda cyhalothrin) on the control of D. citri populations (adults, nymphs and eggs) in ‘Tahiti’ lime trees established under tropical dry forest conditions. In the first experiment, trees were foliarly treated as follows: (1) untreated trees; (2) trees treated with 100 g ha-1 of imidacloprid; (3) trees treated with 60 g ha-1 of bifenthrin; (4) trees treated with 12.5 g ha-1 of deltamethrin and (5) trees treated with a co-formulation of 70 g ha-1 of a neonicotinoid (thiametoxan) and 53 g ha-1 of a pyrethroid (lambda cyhalothrin). In the second experiment, trees were treated with 100 g ha-1 of clothianidin. Foliar insecticide applications were carried out at 0 and 4 weeks after the initiation of treatments (WAT). In the first trial, the control presented a mean number of individuals per flush of ≈1.14, whereas the trees treated with neoinicotinoids and pyrethroids showed 50% fewer individuals (0.53-0.61). For the population of immatures, the number of nymphs was 2.25 nymphs per flush in the control, as compared to 0.82-1.22 individuals observed in the treatments with insecticides. The mean number of eggs was also between 80-100% higher in the control trees (2.37 individuals), as compared to the treated trees (1.14-1.78). In the second trial, the use of clothianidin showed a higher control of eggs. The results suggest that the rotation of neonicotinoids with pyrethroids can be a tool to reduce populations and delay resistance processes in D. citri in citrus trees established under tropical dry forest conditions in Colombia.

scholarly journals Fungal communities in barren forest soil after amendment with different wood substrates and their possible effects on trees’, pathogens, insects and nematodes

2015 ◽  
Vol 55 (3) ◽  
pp. 301-311 ◽  
Author(s):  
Monika Małecka ◽  
Hanna Kwaśna ◽  
Wojciech Szewczyk
Keyword(s):  
Forest Soil ◽  
Scots Pine ◽  
Sandy Loam ◽  
Woody Debris ◽  
Fungal Communities ◽  
Dilution Method ◽  
Pine Sawdust ◽  
Post Harvest ◽  
Abundance And Diversity

AbstractScots pine sawdust, composted bark or coarse, post-harvest woody debris from conifers had been spread over the surface of barren forest soil before planting with Scots pine. The effects of the Scots pine sawdust, composted bark or coarse, post-harvest woody debris from conifers on the abundance and diversity of culturable fungi were investigated. The amendments were aimed at increasing the soil suppressiveness toArmillariaandHeterobasidion.The classical soil-dilution method was chosen for qualitative and quantitative analyses of fungal communities in soils because of its proven reliability and consistency. The soil was inhabited by saprotrophic fungi from Ascomycota and Zygomycota, including species known to be potential antagonists ofArmillariaorH. annosum(i.e.Clonostachys + Trichodermaspp.,Penicillium commune, P. daleae,P. janczewskii) or stimulants ofArmillaria(i.e.Pseudogymnoascus roseus,Trichocladium opacum). Eleven years after treatment, the abundance and diversity of fungi, the abundance ofP. commune, and locally the abundance ofP. janczewskiiincreased, whileClonostachys + Trichodermaspp., and locally,P. daleaeandT. opacumdecreased. Amending the barren soil with organic matter does not guarantee effective, long-term suppressiveness of the sandy loam soil toArmillariaandHeterobasidion.Increased abundance of entomopathogenic and nematophagous species, 11 years after treatment, does suggest the long-term possibility of insect or nematode control in soil.

scholarly journals Forest Diversity and Modeling Diameter Distribution of the Tropical Dryforest in East Nusa Tenggara, Indonesia

2020 ◽  
Vol 9 (1) ◽  
pp. 21-28
Author(s):  
Aah Ahmad Almulqu ◽  
Keyword(s):  
Forest Management ◽  
Stand Structure ◽  
Likelihood Function ◽  
Dry Forest ◽  
Diameter Distribution ◽  
Structure Model ◽  
Distribution Models ◽  
Forest Diversity ◽  
Product Regulation ◽  
Forest Conditions

The variation of forest conditions shows structural differences, species composition, and potential value as well as stand density. The need and important role of stand structure model in forest management, particularly in forest-based product regulation become the supply demands quantitatively for various forest conditions in Indonesia. The objective of the study was to determine the stand structure model of dry forest. The study was conducted at the dry forest of Binafun, Bonmuti, Letkole and Oelbanu, East Nusa Tenggara Province. Determination of the best stand structure model based on maximum likelihood function of family distribution that tested including the function of exponential, gamma, lognormal and Weibull. A total of 2097 tree individuals, its representing 94 species, 72 genera and 45 families, were found in the research sites. Eucalyptus urophylla were found to be the most dominant species in the research sites and Elattostachys verrucosa have potential to replace Dryobalanops aromatic. Most of family distribution models can describe the stand structure in research sites. The models presented here are the basis for further developments toward the tree diversity for general purpose in tropical dry forest management of East Nusa Tenggara, Indonesia.

scholarly journals How rhizobia adapt to the nodule environment

2021 ◽  
Author(s):  
Raphael Ledermann ◽  
Carolin C. M. Schulte ◽  
Philip S. Poole
Keyword(s):  
Nitrogen Fixation ◽  
Soil Bacteria ◽  
Root Nodule ◽  
Computational Modelling ◽  
Diverse Group ◽  
Nitrogen Fixing ◽  
The Core ◽  
Physiological Processes ◽  
Mutualistic Relationship ◽  
The Common

Rhizobia are a phylogenetically diverse group of soil bacteria that engage in mutualistic interactions with legume plants. Although specifics of the symbioses differ between strains and plants, all symbioses ultimately result in the formation of specialized root nodule organs which host the nitrogen-fixing microsymbionts called bacteroids. Inside nodules, bacteroids encounter unique conditions that necessitate global reprogramming of physiological processes and rerouting of their metabolism. Decades of research have addressed these questions using genetics, omics approaches, and more recently computational modelling. Here we discuss the common adaptations of rhizobia to the nodule environment that define the core principles of bacteroid functioning. All bacteroids are growth-arrested and perform energy-intensive nitrogen fixation fueled by plant-provided C4-dicarboxylates at nanomolar oxygen levels. At the same time, bacteroids are subject to host control and sanctioning that ultimately determine their fitness and have fundamental importance for the evolution of a stable mutualistic relationship.

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 Feeding And Absorption in Cerastoderma Eduee Under Environmental Conditions in the Bay of Marennesoleron (Western France)

1996 ◽  
Vol 76 (2) ◽  
pp. 431-450 ◽  
Author(s):  
M.B. Urrutia ◽  
J.I.P. Iglesias ◽  
E. Navarro ◽  
J. Prou
Keyword(s):  
Organic Matter ◽  
Ingestion Rate ◽  
Organic Content ◽  
Absorption Efficiency ◽  
Carbon And Nitrogen ◽  
Physiological Processes ◽  
Tidal Cycles ◽  
Wide Range ◽  
Main Effect ◽  
Strong Dilution

Physiological processes involved in energy acquisition by the filter-feeding bivalve Cerastoderma edule (L.) (Mollusca: Bivalvia) were quantified under naturally fluctuating feeding conditions imposed by tidal cycles in the Bay of Marennes-Oleron. Physiological measurements were performed during two neap and two spring tidal cycles in order to cover a wide range of seston concentrations (TPM = 15–95 mg I-1). The main effect exerted by tides on the food supply was the resuspension of bottom sediments of low organic content, leading to a strong ‘dilution’ of suspended organic matter.Although filtration rate was found to increase with seston concentration, ingestion rate was strictly regulated by means of pseudofaeces production. Selection efficiencies for chlorophyll a (SEchl), overall organic matter (SE0), carbon (SEC) and nitrogen (SEN) were estimated and related to dietary descriptors. The following ranking was found for the efficiency with which different substrates were selected: SEchl>SEN>SEo>SEc. Absorption efficiency was found to depend on the organic content of ingested matter according to an exponential saturating function. Observed differences between carbon and nitrogen absorption efficiency were not statistically significant. Absorption rate was kept fairly constant through the wide range of seston concentrations and qualities.

Potential Evaporation – A Matter of Definition

1993 ◽  
Vol 24 (5) ◽  
pp. 359-364 ◽  
Author(s):  
Anders Lindroth
Keyword(s):  
Evaporation Rate ◽  
Vapour Pressure Deficit ◽  
Open Water ◽  
Dry Forest ◽  
Water Evaporation ◽  
Good Representation ◽  
Large Scatter ◽  
Potential Evaporation ◽  
The Difference ◽  
Forest Conditions

The aim of this paper is to discuss the concept of potential evaporation and its use in runoff models. The potential evaporation for forest is defined on basis of estimated minimum canopy resistances for a well-watered spruce forest. The difference between the Penman open water evaporation, commonly used as “potential” evaporation, and a more realistic estimate of the potential evaporation from a dry forest showed a large scatter and a systematic seasonal deviation. Part of the differences were explained by differences in vapour pressure deficit. It was also shown that the evaporation rate of a completely wet forest was typically four times higher than the rate predicted by the Penman equation. The conclusion was that Penman open water evaporation did not give a good representation of forest conditions.

STUDIES ON THE INTERACTION OF PLANTS AND FREE-LIVING NITROGEN-FIXING MICROORGANISMS: II. DEVELOPMENT OF ANTAGONISTS OF AZOTOBACTER IN THE RHIZOSPHERE OF PLANTS AT DIFFERENT STAGES OF GROWTH IN TWO SOILS

1961 ◽  
Vol 7 (4) ◽  
pp. 507-513 ◽  
Author(s):  
E. Strzelczyk
Keyword(s):  
Organic Matter ◽  
Rhizosphere Soil ◽  
Sandy Loam ◽  
Organic Matter Content ◽  
Matter Content ◽  
Nitrogen Fixing ◽  
Free Living ◽  
Stages Of Growth ◽  
Central Experimental Farm

This study represents an attempt to correlate the low numbers of Azotobacter in rhizosphere and root-free soils at the Central Experimental Farm, Ottawa, with the incidence of bacterial and actinomycete antagonists of this organism. Wheat, radish, and onion were grown in the greenhouse in two soils varying greatly in fertility and organic matter content, and isolations of bacteria and actinomycetes were made periodically for testing against Azotobacter. It was found that rhizosphere soil contained greater numbers of microorganisms antagonistic to Azotobacter than root-free soil. Of the three crops used wheat exerted the least effect. In all the tests numbers of antagonists were greater in the fertile Granby sandy loam than in the infertile Upland sand. The results correlated well with the Azotobacter populations in these soils as reported in the first paper of this series.

Scale of Physiological Processes Sensitivity to PEG-Induced Water Stress in Scots Pine Seedlings

2018 ◽  
Vol 65 (4) ◽  
pp. 532-540 ◽  
Author(s):  
Yu. V. Ivanov ◽  
I. E. Zlobin ◽  
A. V. Kartashov ◽  
P. P. Pashkovskiy ◽  
Vl. V. Kuznetsov
Keyword(s):  
Water Stress ◽  
Scots Pine ◽  
Physiological Processes ◽  
Pine Seedlings

scholarly journals The role of microRNAs in the legume–Rhizobium nitrogen-fixing symbiosis

2020 ◽  
Vol 71 (5) ◽  
pp. 1668-1680 ◽  
Author(s):  
Nhung T Hoang ◽  
Katalin Tóth ◽  
Gary Stacey
Keyword(s):  
Vascular System ◽  
Regulation Of Gene Expression ◽  
Lotus Japonicus ◽  
Nodule Formation ◽  
Nitrogen Fixing ◽  
Rna Molecules ◽  
Physiological Processes ◽  
Leaf Tissues ◽  
And Function

Abstract Under nitrogen starvation, most legume plants form a nitrogen-fixing symbiosis with Rhizobium bacteria. The bacteria induce the formation of a novel organ called the nodule in which rhizobia reside as intracellular symbionts and convert atmospheric nitrogen into ammonia. During this symbiosis, miRNAs are essential for coordinating the various plant processes required for nodule formation and function. miRNAs are non-coding, endogenous RNA molecules, typically 20–24 nucleotides long, that negatively regulate the expression of their target mRNAs. Some miRNAs can move systemically within plant tissues through the vascular system, which mediates, for example, communication between the stem/leaf tissues and the roots. In this review, we summarize the growing number of miRNAs that function during legume nodulation focusing on two model legumes, Lotus japonicus and Medicago truncatula, and two important legume crops, soybean (Glycine max) and common bean (Phaseolus vulgaris). This regulation impacts a variety of physiological processes including hormone signaling and spatial regulation of gene expression. The role of mobile miRNAs in regulating legume nodule number is also highlighted.

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