scholarly journals Karbon Tersimpan Pada Kawasan Sistem Agroforestry Di Register 39 Datar Setuju Kphl Batutegi Kabupaten Tanggamus

2016 ◽  
Vol 4 (1) ◽  
pp. 21
Author(s):  
Dian Aprianto ◽  
Christine Wulandari ◽  
Niskan Walid Masruri
Keyword(s):  
Key Words ◽  
Coffea Arabica ◽  
Agroforestry System ◽  
Allometric Equation ◽  
Cyperus Rotundus ◽  
System Research ◽  
Importance Value Index ◽  
Importance Value ◽  
Dominance Ratio ◽  
The One

Datar Setuju Resort is the one of six resort located in Register 39 KPHL Batutegi. This area is managed by implementing agroforestry system  Research aims to determine amount of stock carbon applied by publics in Register 39 Datar Setuju, held on March 2015 at Register 39 Datar Setuju KPHL Batutegi Tanggamus Regency. Beside to knowing amount of the stock carbon, this research also conducted to determine the dominant vegetation. Reseachers used Summed Dominance Ratio (SDR) and Importance Value Index (IVI) methods to determine the most dominant vegetations and used allometric equation to find out amount biomass and necromass of trees. Research results show that the most dominant vegetation on tree phase was cemara (Casuarina junghuniana) IVI large was 109,91%, for pale phase was dadap (Erythrina sp.) IVI large was 300%, for stake phase was kopi (Coffea arabica) IVI large was 300%, and for seedling phase was rumput teki (Cyperus rotundus) IVI large was 200%. Stock carbons at agroforestry system area Register 39 Datar Setuju KPHL Batutegi on HKm Sinar Harapan amount of 123,33 ton/ha, on HKm Bina Wana Jaya 1 amount of 265,20 ton/ha, and of HKm Bina Wana Jaya 2 amount of 146,20 ton/ha, average  of stock carbon value at Register 39 Datar Setuju amount of 178,24 ton/ha. Key words: stock carbon, agroforestry

scholarly journals Ervas daninha em pastagens: uma abordagem fitossociológica nas áreas do Ceará

Agrarian ◽  
2019 ◽  
Vol 12 (45) ◽  
pp. 279-285
Author(s):  
Josefa Maria Francieli da Silva ◽  
Hercules Gustavo Santos Sarmento ◽  
Hellen Thayse Nascimento Araújo ◽  
Alexandre Bosco de Oliveira ◽  
Lamartine Soares Cardoso de Oliveira
Keyword(s):  
Relative Frequency ◽  
Similarity Index ◽  
Cyperus Rotundus ◽  
Weed Species ◽  
Importance Value Index ◽  
Importance Value ◽  
Brachiaria Decumbens ◽  
The One ◽  
Absolute Dominance ◽  
Nicandra Physalodes

The aim of this study was to study the phytosociology of weed species in areas of pasture cultivated with Brachiaria decumbens and Cynodon sp. (Tifton 85), in Ceará State, Brazil. The square inventory methodology was used in order to assess the weed community. Weed samples were quantified and classified by family, genus and species, using books and classification keys. The classification and quantification data of species allowed to calculate the following phytosociological variables: frequency (F), relative frequency (Fr), density (D), relative density (Dr), absolute dominance (DoA), relative dominance (DoR), importance value index (IVI), and similarity index (IS). The Amaranthaceae family was the one with the greatest intensity of species in both areas, represented mainly by Alternanthera tenera colla and Amaranthus viridis. In the area cultivated with B. decumbens, Cyperus rotundus presented higher results for frequency, density and abundance. In the Tifton 85 area, Nicandra physalodes presented higher values of density and abundance. The similarity of weed populations in pasture areas was 42.11%, with four species common to both areas.

scholarly journals Field study on weeds incidence in rapeseed (Brassica campestris L.).

2019 ◽  
Vol 26 ◽  
pp. 1-6
Author(s):  
MT Akhter ◽  
PB Kundu ◽  
NK Paul
Keyword(s):  
Relative Frequency ◽  
Brassica Campestris ◽  
Cynodon Dactylon ◽  
Cyperus Rotundus ◽  
Importance Value Index ◽  
Importance Value ◽  
Weed Population ◽  
Quantitative Characters ◽  
Weed Flora ◽  
Weed Infestation

A survey was conducted to highlight the weed flora infesting rapeseed in the experimental field of Rajshahi University. Frequency (F), density (D), abundance (A), relative frequency (RF), relative density (RD), relative abundance (RA) and importance value index (IVI %) of weeds were calculated in rapeseed field. The objective of the study was to study the weeds and their quantitative characters. Weed infestation was studied in three rapeseed varieties (BARI Sharisha 14, BINA Sharisha 5 and 6). The weed population was studied using quadrat. The species which had 100% frequency values were Cyperus rotundus, Cynodon dactylon, Ammania baccifera, Echinochloa crusgalli and Leucas lavendulifolia. Other species had 50% or less than 50% frequency values. The highest frequency, density, abundance and importance value index were exhibited by Cyperus rotundus. J. bio-sci. 26: 01-06, 2018

scholarly journals SPACE PATTERN OF FOREST SPECIES AND ITS RELATIONSHIP WITH AGRICULTURAL FACTORS AGROFLORESTAL SYSTEM

FLORESTA ◽  
2019 ◽  
Vol 49 (2) ◽  
pp. 335 ◽  
Author(s):  
Emanuel José Gomes de Araújo ◽  
Dayane Oliveira Lima ◽  
Rafaella De Angeli Curto ◽  
Eduardo Vinícius Silva ◽  
José Carlos Arthur Júnior
Keyword(s):  
Spatial Pattern ◽  
Spatial Relationship ◽  
Gliricidia Sepium ◽  
Agroforestry System ◽  
Edaphic Factors ◽  
Soil Factors ◽  
Importance Value Index ◽  
Importance Value ◽  
Horizontal Structure ◽  
Space Pattern

The objective of this work was to describe the spatial distribution pattern of the arboreal and regenerating forest stratum and its relationship with edaphic factors in a multistratified agroforestry system without management. The data were obtained by means of a census of the arboreal and regenerating plants, in which the variables diameter were measured at 1.30m of the soil and total height, besides the botanical identification. The plants of the arboreal stratum were grouped in diameter and height classes and the regenerating plants in height classes. In both strata, the horizontal structure indicators were estimated and the species of higher Importance Value Index (IVI) were selected to perform the spatial analysis. The K Ripley function was applied in the univariate case to test the hypothesis of complete randomness in the groups and in the arboreal and regenerating species of higher IVI. In the bivariate case, the Ripley K function was applied to test the hypothesis of complete spatial independence between groups or aggregate pattern species, with edaphic attributes. The results indicated random spatial pattern for most of the tested groups, with only the species Gliricidia sepium and Archontophoenix alexandrae with aggregate spatial pattern, up to 30m distance, in the arboreal and regenerating strata, respectively. However, no spatial relationship was observed between the pattern of distribution of the species and the soil factors of agroforestry system (SAF). In general, it is concluded that edaphic factors were fundamental in the development of plants, but not for the formation of aggregates

scholarly journals Estructura y diversidad de la vegetación del matorral espinoso tamaulipeco con condiciones prístinas en el noreste de México

2018 ◽  
Vol 66 (4) ◽  
Author(s):  
Carlos Gerardo Valdez Marroquín ◽  
Marco Antonio Guzmán ◽  
Arcadio Valdés ◽  
Rahim Forougbakhch ◽  
Marco Antonio Alvarado ◽  
...  
Keyword(s):  
Plant Community ◽  
Diversity Index ◽  
Importance Value Index ◽  
Importance Value ◽  
Coverage Density ◽  
A Value ◽  
Wiener Diversity Index ◽  
Structural Variables ◽  
Species Area ◽  
The One

Tamaulipan scrubland is a type of shrub vegetation endemic to Northeastern Mexico and Southern Texas in the U.S.The structure of the Tamaulipan scrubland was evaluated in the study, establishing the minimum area with plots of 256 m2 by determining the species-area curve, valuing the composition and diversity of the strata of the plant species (arboreal, shrub, low forest, semi shrubby, herbaceous and epiphytes); three sampling sites of 16 × 16 m were established. Dasometric information such as height, diameter and cup coverage was recorded to determine the structural variables of coverage, density, relative density, dominance, relative dominance, frequency, relative frequency and Importance Value Index, as well as estimation of the Margalef richness index, Shannon-Wiener diversity index, Menhinick, Simpson and Pielou’s evenness index. The floristic richness was of 33 species distributed in 30 genera and 19 families, leaving the predominance value of the highest species of Leguminosae (Fabaceae). Six strata were recognized for the studied vegetation from which the highest IVI was Helietta parvifolia with 17.68 % for the shrubby stratum with 14 species and within the plant community of the MET the IVI was 8.53 %; for the low forest stratum with 8 species, the one with the highest IVI was Bernardia myricifolia with 39.20 %; and within the vegetal community 7.74 % for the semi shrubby there were 7 species where Lantana canescens has an IVI of 60.38 % and of 13.09 % inside the community. For the herbaceous stratum with 2 species, Wissadula sp. dominates with 54.20 % and 2.06 % for the community. In the arboreal stratum, the species with the highest IVI was Celtis laevigata with 100.00 % and when integrated to the plant community, it presented a value of 1.98 %. For the stratum formed by the epiphytes, the species Adiantum capillus-veneris had an IVI of 100 % and inside the plant community presented an IVI of 1.55 %. For the MET plant community studied, an H' value of 2.42 and a DMg value of 4.34 was obtained.

CONTRIBUTION OF AGROFORESTS IN ADAPTATION OF CLIMATE CHANGE EFFECTS: ESTIMATING THE PHYTODIVERSITY AND C SEQUESTRATION POTENTIAL IN 8-, 16- AND 24-YEAR-OLD OF PINUS SYLVESTRIS AGROFORESTS IN NORTHERN CAMEROON (TROPICAL AFRICA)

2021 ◽  
pp. 2050010
Author(s):  
V. NOIHA NOUMI ◽  
P. KOUAM KAMNING ◽  
C. KAMDOUM DEMGUIA ◽  
L. ZAPFACK
Keyword(s):  
Aboveground Biomass ◽  
Basal Area ◽  
Allometric Equation ◽  
Shannon Index ◽  
Nondestructive Method ◽  
Total Carbon ◽  
Total Biomass ◽  
Importance Value Index ◽  
Importance Value ◽  
Sequestration Potential

The study aims at assessing the agrobiodiversity and carbon stocks by the pine agroforests in the Sudano-Guinean zone of Cameroon. Five [Formula: see text][Formula: see text]m sampling transects were established in each chronosequence, it was undertaken to assess the growth characteristics and biomass. Estimates of stocks of carbon in aboveground biomass, belowground biomass (BGB), total biomass (TB) and CO2 equivalent stock were incorporated in allometric equation based on nondestructive method. A total of 24 species from 23 genera and 17 families were inventoried. Annona senegalensis, Syzygium guineensis and Hymenocardia acida contributed the most to the importance value index (IVI). Density ranged between [Formula: see text]–[Formula: see text] stems/ha; basal area between [Formula: see text]–[Formula: see text][Formula: see text]m2/ha; Shannon index between [Formula: see text]–[Formula: see text] with the highest value for 8-year-old stands; Pielou’s evenness between [Formula: see text]–[Formula: see text] with the lowest value in 24-year-old stands. Aboveground biomass ranged between [Formula: see text]–[Formula: see text] Mg C/ha with the highest value in 16-year-old stands; belowground carbon from [Formula: see text] Mg C/ha to [Formula: see text] Mg C/ha and total carbon from [Formula: see text] Mg C/ha to [Formula: see text] Mg C/ha. The sequestration potential ranged from [Formula: see text] Mg CO[Formula: see text]/ha to [Formula: see text] Mg CO[Formula: see text]/ha. The sequestration rates were 84.77, 49.7 and 28.6 Mg CO[Formula: see text].ha[Formula: see text]yr[Formula: see text] in 8-, 16- and 24-year-old stands, respectively. Although our data reported that pine stands hosted a few number of species; they are true carbon sinks and useful to the REED[Formula: see text] community.

scholarly journals FITOSSOCIOLOGIA DA COMUNIDADE DE PLANTAS DANINHAS NA CULTURA DA SOJA TRANSGÊNICA SOB DOIS SISTEMAS DE PREPARO DO SOLO

2011 ◽  
Vol 12 (1) ◽  
Author(s):  
Cíntia Maria Teixeira FIALHO ◽  
José Barbosa dos SANTOS ◽  
Marco Antônio Moreira de FREITAS ◽  
André Cabral FRANÇA ◽  
Antonio Alberto da SILVA ◽  
...  
Keyword(s):  
Cyperus Rotundus ◽  
No Tillage ◽  
Conventional System ◽  
Herbicide Application ◽  
Importance Value Index ◽  
Importance Value ◽  
Four Seasons ◽  
Before And After ◽  
Tillage System ◽  
Chlorimuron Ethyl

Objetivou-se com este trabalho realizar o levantamento fitossociológico de plantas daninhas antes e após aplicação de herbicidas pós-emergentes na cultura da soja transgênica. Os tratamentos foram distribuídos em blocos casualizados com os herbicidas: lactofen + chlorimuron-ethyl (150 + 50 g ha-1), imazethapyr + fomesafen (100 + 250 g ha-1) e glyphosate (1000g ha-1) nos sistemas de plantio direto e convencional. As amostragens de plantas daninhas ocorreram em quatro épocas: antes da aplicação dos herbicidas (estádio V2); aos sete dias após aplicação dos herbicidas (estádio V4); no início do florescimento da cultura (R1) e em pré-colheita da soja (estádio R8), utilizando quadrado inventário (0,25 m²) jogado ao acaso nas parcelas por duas vezes. As espécies vegetais amostradas foram identificadas, contadas e pesadas para obtenção dos parâmetros fitossociológicos. As plantas daninhas de maior densidade, abundância e índice de valor de importância no local foram: Brachiaria plantaginea, Euphorbia heterophylla, Ipomoea sp., Cyperus rotundus e Digitaria horizontalis. No sistema de plantio convencional B. plantaginea e C. rotundus apresentaram os maiores índices de valor de importância, e no sistema de plantio direto B. plantaginea e D. horizontalis. Ao final do ciclo da cultura, no sistema de plantio convencional, o controle feito com somente glyphosate permitiu reinfestação por C. rotundus. No sistema de plantio direto, nessa mesma época, observouse predomínio de B. plantaginea seguida por D. horizontalis, sendo que a última não esteve presente nas parcelas tratadas com imazethapyr + fomesafen.  Abstract This objective of this work was to carry out a phytosociological assessment of the weed communiy before and after post-emergents herbicides application on transgenic soy crop. The treatments were arranged in random blocks by using:lactofen + chlorimuron-ethyl (150 + 50 g ha-1), imazethapyr + fomesafen (100 + 250 g ha-1) and glyphosate(1000 g ha-1) underno-tillage and conventional systems. The weed community sampling occurred in four seasons: before herbicide application (V2 stage); seven days after herbicide application (V4 stage); at the beginning of flowerage (R1) and at soy pre-harvest (R8 stage), using the inventory square method applied through a square of 0.25 m², randomly placed twice. The species found were identified, counted and weighed to obtain phytosociological parameters. The families that showed higher density, abundance and importance value index in the area were: Brachiaria plantaginea, Euphorbia heterophylla, Ipomoea sp., Cyperus rotundus and Digitaria horizontalis, meanwhile B. plantaginea and C. rotundus showed higher importance value index under conventional system and B. plantaginea and D. horizontalis showed importance value index under no-tillage systems. Comparing the systems, at the end of the crop cycle, the management using only glyphosate under conventional system allowed a significative C. rotundus infestation. Under no-tillage system, at the same season, B. plantaginea predominated followed by D. horizontalis wasn’t present in parcels treated with imazethapyr + fomesafen.

scholarly journals Weed control in organic maize crop with direct sowing

2019 ◽  
Vol 13 (2) ◽  
pp. 228-236
Author(s):  
Ana Ligia Giraldeli ◽  
Anastacia Fontanetti ◽  
Dayane Graziella Pereira de Oliveira dos Santos
Keyword(s):  
Grain Yield ◽  
Weed Management ◽  
Block Design ◽  
Cultural Control ◽  
Cyperus Rotundus ◽  
Panicum Maximum ◽  
No Tillage ◽  
Importance Value Index ◽  
Importance Value ◽  
Tillage System

One of the main difficulties in the organic, no-tillage system is weed management. The aim of this study was to evaluate the effect of the association between mechanical and cultural control methods (reduction of spacing and consortium with Canavalia ensiformis DC) on weed phytosociology and grain yield in maize with the organic, no-tillage system. The experiment design was a randomized complete block design with four replications, in a 2×3×2 factorial scheme, where the factors were, first factor: presence and absence of C. ensiformis; second factor: three weed management methods (without control, mowing and weeding), and third factor: two maize spacings (0.4 and 0.8 m). We evaluated the phytosociology of the weed community in maize stages V4 and V8, maize yield and dry matter of C. ensiformis. In the V4 stage, 21 weed species were identified, which were reduced to 16 species in V8. Cyperus rotundus presented a higher IR (Importance Value Index) in V4, and Panicum maximum had the highest IR in V8, independent of management. The C. ensiformis consortium with maize with 0.8 m spacing and weeding provided a higher grain yield.

scholarly journals Floristic Composition of Weeds in Paddy Fields in Mahendranagar, Nepal

1970 ◽  
Vol 16 ◽  
pp. 15-19 ◽  
Author(s):  
M. D. Bhatt ◽  
A. Tewari ◽  
S. P. Singh
Keyword(s):  
Key Words ◽  
Field Experiments ◽  
Floristic Composition ◽  
Paddy Fields ◽  
Weed Species ◽  
Ageratum Conyzoides ◽  
Importance Value Index ◽  
Importance Value ◽  
Cyperus Difformis

Field experiments were conducted during 2004 and 2005 in paddy fields to evaluate the floristic composition of weeds, in lowland and upland areas of Mahendranagar, Nepal. A total of 61 weed species belonging to 42 genera and 23 families were recorded. Of the 23 families, Cyperaceae was the largest (13 spp.), followed by Poaceae (11 spp.), Euphorbiaceae (4 spp.), Amaranthaceae, Commelinaceae and Asteraceae (3 spp. each), Polygonaceae (2 spp.) and one species each belonged to Apiaceae, Acanthaceae, Alismataceae, Pontederiaceae, Leguminosae, Convolvulaceae, Eriocaulaceae, Marsileaceae, Malvaceae, Oxalidaceae, Onagraceae, Parkeriaceae, Portulaceae, Rubiaceae and Verbenaceae. The number of weed species was higher in upland (55) when compared with the lowland sites (48). On the basis of Importance Value Index (IVI) dominating weed species in paddy fields were: Fimbristylis miliacea (13.4), Lindernia oppositifolia (13.2), Eleocharis atropurpurea (13.1), Ageratum conyzoides (13.0), Cyperus iria (13.0), Echinochloa crus-galli (11.9), Ischaemum rugosum (11.7), Echinochloa colona (11.4), Cyperus difformis (11.1) and Schoenoplectus juncoides (11.0). Besides dicots and monocots, two species of pteridophytes (Ceratopteris thalictriodes and Marsilea minuta) were also recorded in lowland paddy fields. Key words: Paddy, weeds, upland, lowland, IVI. DOI: 10.3126/eco.v16i0.3468ECOPRINT 16: 15-19, 2009

scholarly journals Phytosociological Survey of Sugarcane Crop Weeds in Different Agroecological Areas in Tucumán Province, Argentina

2019 ◽  
Vol 37 ◽  
Author(s):  
D.C. CABRERA ◽  
S. CHAILA ◽  
M.T. SOBRERO ◽  
A.E. VARELA
Keyword(s):  
Cynodon Dactylon ◽  
Diversity Index ◽  
Similarity Index ◽  
Cyperus Rotundus ◽  
Group Method ◽  
Panicum Maximum ◽  
Importance Value Index ◽  
Importance Value ◽  
Species Diversity Index ◽  
Pampean Plain

ABSTRACT: Weeds constitute the main constraint on the productivity of sugarcane agroecosystems in Argentina. This work aimed to analyze the floristic and phytosociological composition of sugarcane weed communities in different agroecological areas in Tucumán. Fifteen plots from each area were sampled 60 to 90 days after crop shooting, by throwing a 0.5 m x 0.5 m quadrat metallic frame six times in random directions in each of the plots. Species found within the frame were identified. Later, fresh and dry biomass weight were calculated per quadrat sample and species. Frequency, density, dominance, importance value index, Shannon-Wiener and Simpson species diversity index and Jaccard similarity index were calculated. The unweighted pair group method with arithmetic mean (UPGMA) was used to interpret similarity. Overall, 35 species were identified, 24 of which were dicotyledons and 11 monocotyledons. Eighteen of them were annual species, versus 17 which were perennial. Considering IVI, the most outstanding families were Poaceae, Cyperaceae, Euphorbiaceae, Amaranthaceae and Asteraceae. The results obtained in all the areas revealed the importance of the species Panicum maximum, Sorghum halepense, Cyperus rotundus, Cynodon dactylon and Euphorbia hyssopifolia. The areas with greater and less diversity were the Depressed Plain-Non-Saline Depressed Plain Subregion and the Subhumid-Humid Chaco-Pampean Plain, respectively. There was a 53% similarity between the Depressed Plain-Saline Depressed Plain and the Depressed Plain-Non-Saline Depressed Plain, and a 47% similarity between the Humid and Perhumid Foothills and the Subhumid-Humid Chaco-Pampean Plain. Hierarchical clustering and Jaccard index led to similar results.

scholarly journals Analisis Is Structure and Vegetation Composition Increases Tree and Pillar at Hutan Lindung Oereu Village Bani Bani Is Io Kufeudistrict Malacca Regency

2020 ◽  
Vol 5 (1) ◽  
pp. 24-36
Author(s):  
Angela Niis
Keyword(s):  
Basal Area ◽  
Tectona Grandis ◽  
Tree Level ◽  
Importance Value Index ◽  
Importance Value ◽  
Transect Line ◽  
Absolute Density ◽  
The One ◽  
Index Value ◽  
Important Value Index

The purpose of this study was to determine the tree and pole-level plant species found in the Oereu Protected Forest Bani-Bani Village Io Kufeu District of Malacca District, To find out the structure and composition of tree-level plant vegetation and poles found in the Oereu Protected Forest in the Bani-Bani Village District of Io Kufeu District of Malacca, and To implement research on the structure and composition of tree and pole level vegetation in the Oereu Protection Forest of Desa Bani-Bani District of Io Kufeu District of Malacca in learning biology in schools. The method used in this study is the quadratic method by placing a plot beside the transect line. At each transect line, 5 observation plots were placed with the size of each plot 20 mx 20 m = 400 m2 for tree level, and 10 mx 10 m = 100 m2 for pole level, with a distance between plots 25 m. analyzing the structure and composition of tree-level vegetation, and poles found at research sites, namely by calculating absolute density, relative density, absolute frequency, relative frequency, basal area, relative basal area, and important value index. The results of the study were found as many as 13 types of plants consisting of 11 families. When looking at the importance value index at tree level vegetation, the highest important value index is Tectona grandis, L, 57.35%, while the one with the lowest important value index is Alstonia scholaris, L 13.22%, and at pole level vegetation, the index value the highest importance is Tectona grandis, L, 36.33%, while the one with the lowest important value index is Leucena lenccophalla, 16.25%. The type of vegetation that has the highest important value index is because it has a fairly high distribution ability and can adapt well to its environment.

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