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您的检索式：作者名="Tesfay Gebremariam"
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| 1 | Rehabilitation of indigenous browse plant species following exclosure established on communal grazing lands in South Tigray, Ethiopia, and implication for conservation显示文摘Background:Despite the wide use of indigenous browse plant species,there is almost no information on the rehabilitation of indigenous browse species following area exclosure(AE)established on communal grazing lands(CGL)in Southern Tigray.The objectives of this study were to assess the rehabilitation of browse plant species following AE establishment on CGL.A total of 61 and 59 plots of 10×10m2 size were laid down at 50-m intervals along parallel line transects at AE and GCL,respectively.Data collected on vegetation attributes were subjected to analysis of t test(unequal variances)using R-software.Results:The Shannon diversity index of the browse plant species was 1.25 and 0.81 in AE and CGL,respectively(P<0.001).The overall population structure of browse plant species in the AE shows a reverse J-shaped population curve and“good”regeneration status,which reveals that the future communities may be sustained.Leaf biomass and basal area of browse plant species were significantly higher in the AE than in CGL(P<0.001).After exclusion of grazing,AE was found to have positive effects on diversity and aboveground biomass of browse plant species.Conclusions:The study gives an understanding of the diversity,the pattern of population and regeneration of the browse plant species,which may help in the management and conservation of the species.Our results indicate that grazing exclusion is an effective management strategy to restore browse plant species.We concluded that the establishment of AE had a positive effect on the rehabilitation of browse plant species diversity and improved population structure and regeneration potentials of degraded grazing lands.Long-term monitoring and evaluation systems will be required to gain an informed understanding of the roles played by area exclosures in the rehabilitation and conservation of browse palnt species diversity. | Tesfay Atsbha Solomon Wayu Nguse Gebretsadkan Tesfay Gebremariam Tsgehiwet Giday | 2019 | Ecological Processes2019，8，1： | 1 |
| 2 | Observation and Measures of Robust Correlations for Continuous Variable System显示文摘In this work, we examine the robust continuous variable quantum correlation by analyzing two coupled optomechanical systems. Under the linearization approximation, the steady state correlation is quantified through correlation function of two non-Hermitian operators and we find that quantum correlation is always existence between two optical fields, two-oscillators and optical field-oscillator. Unlike the discrete variable system, we show quantum correlation in our model seems to be independent without any close transfer relationship. We further emphasize the influence of cavity-cavity coupling parameter on the amount of quantum correlations. | Tesfay Gebremariam 曾业雄 陈歆宇 李崇 | 2017 | Communications in Theoretical Physics2017，67，11： | 0 |
| 3 | Enhancing optomechanical force sensing via precooling and quantum noise cancellation显示文摘We theoretically investigate optomechanical force sensing via precooling and quantum noise cancellation in two coupled cavity optomechanical systems.We show that force sensing based on the reduction of noise can be used to dramatically enhance the force sensing and that the precooling process can eifectively improve the quantum noise cancellation.Specifically,we examine the effect of optomechanical cooling and noise reduction on the spectral density of the noise of the force measurement;these processes can significantly enhance the performance of optomechanical force sensing,and setting up the system in the resolved sideband regime can lead to an optimization of the cooling processes in a hybrid system.Such a scheme serves as a promising platform for quantum back-action-evading measurements of the motion and a framework for an optomechanical force sensor. | Tesfay Gebremariam Ye-Xiong Zeng Mojtaba Mazaheri Chong Li | 2020 | Science China(Physics,Mechanics & Astronomy)2020，63，1： | 0 |
| 4 | Exclosure land management for restoration of herbaceous species in degraded communal grazing lands in Southern Tigray显示文摘Herbaceous species contribute to the largest proportion of the fodder.Despite the profound benefits obtained,anthropogenic disturbances are hindering its development.On the other hand,to ensure the sustainability of herbaceous species,communities and governments have been putting efforts in managing herbaceous species through the establishment of area exclosure(AE).Thus,the main importance of this research paper is to provide information about the role of AE on the restoration of herbaceous species.The objective of this study was to assess the effect of restoration on the herbaceous species following AE established on communal grazing land(CGL).A total of 124 and 73 quadrats of 1×1m^(2) size were laid down at 50 m intervals along parallel transects at AE and CGL,respectively,and data were analyzed by t-test unequal variances using R-software.AE displayed higher plant species richness and diversity than the CGL and showed a significant difference(p<0.001).Similarly,the AE had significantly(p<0.001)higher forage biomass than the CGL.In general,herbaceous species diversity index and species richness were significantly(p<0.001)higher in the AE compared to the CGL.The study concluded that effective AE has the potential to enhance the restoration of herbaceous species and hence forage productivity. | Tesfay Atsbha Solomon Wayu Nguse Gebretsadkan Tsgehiwet Giday Tesfay Gebremariam | 2020 | Ecosystem Health and Sustainability2020，6，1： | 0 |
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