Bromus tectorum cover mapping and fire risk

2006 ◽  
Vol 15 (1) ◽  
pp. 113 ◽  
Author(s):  
Steven O. Link ◽  
Carson W. Keeler ◽  
Randal W. Hill ◽  
Eric Hagen
Keyword(s):  
Bromus Tectorum ◽  
Fire Risk ◽  
Aerial Photographs ◽  
Annual Grass ◽  
Poa Secunda ◽  
Shrub Steppe ◽  
Prediction Confidence ◽  
Fine Resolution ◽  
The Relationship ◽  
Steppe Community

Fire risk in western North America has increased with increasing cover of Bromus tectorum, an invasive alien annual grass. The relationship between B. tectorum cover and fire risk was determined in a historically burned Artemisia tridentata-Poa secunda shrub–steppe community where B. tectorum cover ranged from 5 to 75%. Fire risk ranged from ~46% with an average of 12% B. tectorum cover to 100% when B. tectorum cover was greater than 45% based on prediction confidence limits. Reflectance of the green and red bands of aerial photographs were related to senescent B. tectorum cover to create fine resolution B. tectorum cover and fire risk maps. This assessment technique will allow land managers to prioritize lands for restoration to reduce fire risk in the shrub-steppe.

scholarly journals Cover-based allometric estimate of aboveground biomass of a non-native, invasive annual grass (Bromus tectorum L.) in the Great Basin, USA

2021 ◽  
Vol 193 ◽  
pp. 104582
Author(s):  
Adam L. Mahood ◽  
Erica Fleishman ◽  
Jennifer K. Balch ◽  
Frank Fogarty ◽  
Ned Horning ◽  
...  
Keyword(s):  
Great Basin ◽  
Aboveground Biomass ◽  
Bromus Tectorum ◽  
Annual Grass ◽  
Native Invasive

Downy Brome (Bromus tectorum) Vernalization: Variation and Genetic Controls

Weed Science ◽  
2018 ◽  
Vol 66 (3) ◽  
pp. 310-316 ◽  
Author(s):  
Nevin C. Lawrence ◽  
Amber L. Hauvermale ◽  
Ian C. Burke
Keyword(s):  
North America ◽  
Bromus Tectorum ◽  
Brachypodium Distachyon ◽  
Western North America ◽  
Downy Brome ◽  
Annual Grass ◽  
Vernalization Gene ◽  
Greenhouse Experiments ◽  
Winter Annual

AbstractDowny brome (Bromus tectorumL.) is a widely distributed invasive winter annual grass across western North America.Bromus tectorumphenology can vary considerably among populations, and those differences are considered adaptively significant. A consensus hypothesis in the literature attributes the majority of observed differences inB. tectorumphenology to differing vernalization requirements among populations. A series of greenhouse experiments were conducted to identify differences inB. tectorumvernalization requirements and link vernalization to expression of annual false-brome [Brachypodium distachyon(L.) P. Beauv.]-derived vernalization gene homolog (BdVRN1). Results from this study indicate that variation in time to flowering is partially governed by differing vernalization requirements and that flowering is linked to the expression ofBdVRN1.

scholarly journals Intensitas Serangan Hama Tikus Tanaman Padi Menggunakan Metode Pengamatan Keliling Berhubungan Linier dengan Luas Serangan Hasil Analisi Foto Udara

2019 ◽  
Vol 7 (2) ◽  
pp. 279
Author(s):  
I Ketut Satria Rahadi ◽  
I Made Anom Sutrisna Wijaya ◽  
I Wayan Tika
Keyword(s):  
Image Processing ◽  
Regression Analysis ◽  
Sampling Methods ◽  
Regression Coefficient ◽  
Aerial Photographs ◽  
Aerial Image ◽  
Crop Failure ◽  
Error Factor ◽  
The Relationship ◽  
Attack Intensity

Hama tikus adalah hama yang dapat menyebabkan kegagalan panen tanaman padi. Metode yang digunakan untuk mengukur besaran serangan hama tikus adalah metode pengambilan contoh dan pendekatan foto udara. Namun dari kedua metode ini tingkat serangan yang dihasilkan belum diketahui korelasinya. Maka dari itu dilakukannya penelitian ini untuk mendapatkan hubungan antara intensitas dan luas serangan hama tikus tanaman padi. Tahapan penelitian ini adalah survei lokasi yang terserang hama tikus, persiapan alat, pengambilan foto udara, pengambilan sampel untuk perhitungan intensitas serangan, pengolahan citra, perhitungan luas serangan, analisis regresi dan validasi. Intensitas serangan dihitung menggunakan perhitungan secara mutlak, sedangkan luas serangan dihitung menggunakan metode pengolahan citra foto udara yang dikembangkang oleh Widodo. Analisis regresi menunjukan bahwa hubungan antara intensitas serangan dengan luas serangan memiliki koefisien determinasi 0,889 dan persamaan regresi yang diperoleh y = 1,138x dengan faktor kesalahan 8,947%. Intensitas serangan hama tikus tanaman padi menggunakan metode pengambilan contoh berhubungan linier dengan luas serangan hasil analisis foto udara yang dikembangkan oleh Widodo.   Rat pests are pests that can cause crop failure in rice plant. The method used to calculate the number of rodent pest attacks is the method of sampling and obtaining aerial photographs. But from these two methods the level of attack produced is not known to correlate. So this study purpose to obtain a relationship between intensity of attack with area of attack rat pest of rice plants. The stages of this study were location surveys that were attacked by rat pests, preparation of tools, aerial photography, and sampling for the calculation of attack intensity, image processing, area attack, regression analysis and validation. The intensity of attacks is calculated using total calculations, while broad attacks are calculated using the aerial image processing method developed by Widodo. Regression analysis shows the relationship between the intensity of ??attack with the area of ??attack has a determination coefficient of 0.889 and the regression coefficient obtained y = 1.138x with an error factor of 8.947%. The intensity of rat pest attacks using linear related sampling methods with broad attack results from aerial photo analysis developed by Widodo.

scholarly journals Secondary dormancy of seeds in relation to the Bromus tectorum–Pyrenophora semeniperda pathosystem

2013 ◽  
Vol 49 (Special Issue) ◽  
pp. S11-S14 ◽  
Author(s):  
K.K. Hawkins ◽  
P. Allen ◽  
S. Meyer
Keyword(s):  
Seed Germination ◽  
Field Study ◽  
Seed Bank ◽  
Fungal Pathogen ◽  
Bromus Tectorum ◽  
Large Fraction ◽  
Annual Grass ◽  
Late Autumn ◽  
Secondary Dormancy ◽  
Laboratory Results

Bromus tectorum is a highly invasive annual grass. The fungal pathogen Pyrenophora semeniperda can kill a large fraction of B. tectorum seeds. Outcomes in this pathosystem are often determined by the speed of seed germination. In this paper we extend previous efforts to describe the pathosystem by characterising secondary dormancy acquisition of B. tectorum. In the laboratory approximately 80% of seeds incubated at –1.0 MPa became dormant. In the field, seeds were placed in the seed bank in late autumn, retrieved monthly and dormancy status determined. The field study confirmed the laboratory results; ungerminated seeds became increasingly dormant. Our data suggest that secondary dormancy is much more likely to occur at xeric sites.

Development of remote sensing indicators for mapping episodic die-off of an invasive annual grass (Bromus tectorum) from the Landsat archive

2017 ◽  
Vol 79 ◽  
pp. 173-181 ◽  
Author(s):  
Peter J. Weisberg ◽  
Thomas E. Dilts ◽  
Owen W. Baughman ◽  
Susan E. Meyer ◽  
Elizabeth A. Leger ◽  
...  
Keyword(s):  
Remote Sensing ◽  
Bromus Tectorum ◽  
Annual Grass

scholarly journals Transition From Sagebrush Steppe to Annual Grass (Bromus tectorum): Influence on Belowground Carbon and Nitrogen

2011 ◽  
Vol 64 (2) ◽  
pp. 139-147 ◽  
Author(s):  
Benjamin M. Rau ◽  
Dale W. Johnson ◽  
Robert R. Blank ◽  
Annmarrie. Lucchesi ◽  
Todd G. Caldwell ◽  
...  
Keyword(s):  
Bromus Tectorum ◽  
Sagebrush Steppe ◽  
Annual Grass ◽  
Carbon And Nitrogen ◽  
Belowground Carbon

Effects of Giant Foxtail (Setaria faberi) and Yellow Foxtail (Setaria pumila) Competition on Establishment and Productivity of Switchgrass

Weed Science ◽  
2016 ◽  
Vol 64 (1) ◽  
pp. 129-136 ◽  
Author(s):  
Ariel A. D. Larson ◽  
Mark J. Renz ◽  
David E. Stoltenberg
Keyword(s):  
Competitive Ability ◽  
Yield Loss ◽  
Annual Grass ◽  
Weed Species ◽  
Setaria Faberi ◽  
Giant Foxtail ◽  
Plant Densities ◽  
Second Year ◽  
Cellulosic Bioenergy ◽  
The Relationship

Switchgrass is a potential feedstock for cellulosic bioenergy production. Weed competition from annual grass during the establishment year can reduce switchgrass establishment and resulting productivity, but the relationship between early season grass densities and outcomes of competition are not well understood. We measured how a range of giant and yellow foxtail densities in the establishment year influenced switchgrass establishment and resulting productivity in the first production year (second year of the growing season). In two of the three site–yr more than four foxtail plants m−2reduced switchgrass plant densities below documented thresholds of establishment success. A lesser effect of foxtails in the third site–year suggested that higher switchgrass emergence rates reduced foxtail competitive ability during establishment. Effects on yield were consistent over the three site–yr. The yield (10.96 Mg ha−1± 0.77) decreased rapidly as foxtail density increased. One foxtail plant m−2reduced switchgrass yield in the first production year by 25%, and yield loss was 90% or greater at densities > 50 foxtail plants m−2. Although switchgrass can establish in the presence of foxtail competition, these weed species should be controlled to maximize yields in the first production year.

Sign in / Sign up

Export Citation Format

Share Document