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Coupling remote sensing and crop growth model to estimate national wheat yield in Ethiopia

Big Earth Data 2022年第1期6卷 18-35页

作者： Awetahegn Niguse Beyene Hongwei Zeng Bingfang Wu Liang Zhu tesfay gebretsadkan gebremicael Miao Zhang Temesgen Bezabh State Key Laboratory of Remote Sensing Science Aerospace Information Research InstituteChinese Academy of SciencesBeijingChina College of Resources and Environment University of Chinese Academy of SciencesBeijingChina Tigray Agricultural Research Institute MekelleEthiopia Climate Change and Rural Development Mekelle UniversityMekelleEthiopia

Estimation of crop yield at a regional level is essential for making agricultural planning and addressing food security issues in *** sensing observations,particularly the leaf area index(LAI),have a strong relationship with crop *** study has proposed an approach to estimate wheat yield at field level and regional scale in Ethiopia by assimilating the retrieved MODIS time-series LAI data into the WOrld FOod STudies(WOFOST)*** improve the estimation of crop yield in the region,the Ensemble Kalman Filter(EnKF)was used to incorporate the LAI into the WOFOST *** estimation accuracy of wheat crop yield was validated using field-measured yields collected during the 2018 growing *** findings indicated that wheat yield was more precisely estimated by WOFOST(at water-limited mode)with EnKF algorithm(R^(2)=0.80 and RMSE=413 kg ha^(−1))compared to that of without assimilating remotely sensed LAI(R^(2)=0.58,RMSE=592 kg ha^(−1)).These results demonstrated that assimilating MODIS-LAI into WOFOST has high potential and practicality to give a reference for wheat yield *** findings from this study can provide information to policy,decision-makers,and other similar sectors to implement an appropriate and timely yield estimation measure.

关键词： Wheat yield WOFOST model Ensemble Kalman Filter remote sensing

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Evaluation of Global Gridded Precipitation and Temperature Datasets against Gauged Observations over the Upper Tekeze River Basin,Ethiopia

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Journal of Meteorological Research 2021年第4期35卷 673-689页

作者： Kidane Welde REDA Xingcai LIU Qiuhong TANG tesfay gebretsadkan gebremicael Key Laboratory of Water Cycle and Related Land Surface Processes Institute of Geographic Sciences and Natural Resources ResearchChinese Academy of SciencesBeijing 100101China University of Chinese Academy of Sciences Beijing 100049China Tigray Agricultural Research Institute Mekelle 492Ethiopia

The availability of satellite and reanalysis climate datasets and their applicability have been greatly promoted in hydro-climatic ***,such climatic products are still subject to considerable uncertainties and an evaluation of the products is necessary for applications in specific *** study aims to evaluate the reliability of nine gridded precipitation and temperature datasets against ground-based observations in the upper Tekeze River basin(UTB)of Ethiopia from 1982 to ***,maximum temperature(Tmax),minimum temperature(Tmin),and mean temperature(Tmean)were evaluated at daily and monthly *** results show that the best estimates of precipitation are from the Eart H2 Observe,WFDEI,and ERA-Interim reanalysis data Merged and Bias-corrected for the Inter-Sectoral Impact Model Intercomparison Project(EWEMBI),and the Climate Hazards Group Infra Red Precipitation with Station data(CHIRPS)*** percentage biases and correlation coefficients(CCs)are within±15%and>0.5,respectively,for both EWEMBI and CHIRPS at the two *** products underestimate the drought conditions indicated by the standardized precipitation index(SPI),while the EWEMBI and CHIRPS datasets show higher agreement with the observations than other *** Tmean estimates produced by the ECMWF ReAnalysis version 5(ERA5)and the Climate Hazards Group Infra Red Temperature with Station data(CHIRTS)are the closest to the observations,with CCs of 0.65 and 0.55,respectively,at the daily *** CHIRTS and EWEMBI datasets show better representations of Tmax(T_(min)),with CCs of 0.69(0.72)and 0.62(0.68),respectively,at the monthly *** temperature extremes are better captured by the ERA5(T_(mean)),CHIRTS(T_(max)),and EWEMBI(T_(min))*** findings of this study provide useful information to select the most appropriate dataset for hydrometeorological studies in the UTB and could help to improve the regional representation of global da

关键词： climatic datasets evaluation rainfall temperature Tekeze River basin

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Rehabilitation of indigenous browse plant species following exclosure established on communal grazing lands in South Tigray, Ethiopia, and implication for conservation

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Ecological Processes 2019年第1期8卷 530-538页

作者： tesfay Atsbha Solomon Wayu Nguse gebretsadkan tesfay Gebremariam Tsgehiwet Giday Tigray Agricultural Research Institute Alamata Agriculture Research CenterP.O.Box56AlamataEthiopia

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 *** 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,*** collected on vegetation attributes were subjected to analysis of t test(unequal variances)using ***: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 *** 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 ***: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 *** results indicate that grazing exclusion is an effective management strategy to restore browse plant *** 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 ***-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.

关键词： Browse Rehabilitation Restoration

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Exclosure land management for restoration of herbaceous species in degraded communal grazing lands in Southern Tigray

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Ecosystem Health and Sustainability 2020年第1期6卷 309-319,308页

作者： tesfay Atsbha Solomon Wayu Nguse gebretsadkan Tsgehiwet Giday tesfay Gebremariam Tigray Agricultural Research Institute Alamata Agriculture Research CenterP.O.BOX 56AlamataEthiopia

Herbaceous species contribute to the largest proportion of the *** the profound benefits obtained,anthropogenic disturbances are hindering its *** 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 *** 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 *** 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 *** general,herbaceous species diversity index and species richness were significantly(p<0.001)higher in the AE compared to the *** study concluded that effective AE has the potential to enhance the restoration of herbaceous species and hence forage productivity.

关键词： Grazing land land conservation palatable indigenous vegetation area exclosure

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