Introduction:Climate change will either improve,reduce,or shift its appropriate climatic habitat of a particular species,which could result in shifts from its geographical range.Predicting the potential distribution t...Introduction:Climate change will either improve,reduce,or shift its appropriate climatic habitat of a particular species,which could result in shifts from its geographical range.Predicting the potential distribution through MaxEnt modeling has been developed as an appropriate tool for assessing habitat distribution and resource conservation to protect bamboo species.Methods:Our objective is to model the current and future distribution of Oxytenanthera abyssinica(A.Richard)based on three representative concentration pathways(RCP)(RCP2.6,RCP4.5,and RCP8.5)for 2050s and 2070s using a maximum entropy model(MaxEnt)in Northern Ethiopia.For modeling procedure,77 occurrence records and 11 variables were retained to simulate the current and future distributions of Oxytenanthera abyssinica in Northern Ethiopia.To evaluate the performance of the model,the area under the receiver operating characteristic(ROC)curve(AUC)was used.Results:All of the AUCs(area under curves)were greater than 0.900,thereby placing these models in the“excellent”category.The jackknife test also showed that precipitation of the coldest quarter(Bio19)and precipitation of the warmest quarter(Bio18)contributed 66.8%and 54.7%to the model.From the area of current distribution,1367.51 km2(2.52%),7226.28 km2(13.29%),and 5377.26 km2(9.89%)of the study area were recognized as high,good,and moderate potential habitats of Oxytenanthera abyssinica in Northern Ethiopia,and the high potential area was mainly concentrated in Tanqua Abergele(0.70%),Kola Temben(0.65%),Tselemti(0.60%),and Tsegede(0.31%).Kafta Humera was also the largest good potential area,which accounts for 2.75%.Compared to the current distribution,the total area of the high potential regions and good potential regions for Oxytenanthera abyssinica under the three RCPs(RCP2.6,RCP4.5,and RCP8.5)would increase in the 2050s and 2070s.However,the total area of the least potential regions under the three RCPs(RCP2.6,RCP4.5,and RCP8.5)in 2050s and 2070s would decrease.Conclusion:This study can provide vital information for the protection,management,and sustainable use of Oxytenanthera abyssinica,the resource to address the global climate challenges.展开更多
The aim of this paper is to provide the data that the transplant advantage in southwest aridity area of China so that shoot’s trace element and nutritional components of wine bamboo,Oxytenanthera braunii,through the ...The aim of this paper is to provide the data that the transplant advantage in southwest aridity area of China so that shoot’s trace element and nutritional components of wine bamboo,Oxytenanthera braunii,through the winter especially under plastic film mulching condition were measured.The results showed that plastic film mulching could precede in time of shoot germination and enhance the shoot quality such as improving absorbability of trace element,increasing content of protein,sugar,coarse fiber and majority of amino acid.And also,it could accelerate the development of shoot responding to the difference of base diameter.Wine bamboo’s trace element was rich,and the content of crude fat and sugar were higher compared with the shoot of Phyllostachys edulis,P.edulis cv.pachyloen and Dendrocalamus brandisii with the closer relationship that the excreting sap contained about 5% alcohol through new cutting stem.Wine bamboo germinated shoots in whole year at Mojiang Base if mother plant could absorb enough nutrition resulting in great consumption of nutriment and physiological turbulence like decreasing amino acid content under an inaptitude condition.So the amino acid content was low which were 1.3%,1.04% under treatment of plastic film mulching and the control respectively,although all kinds of necessary amino acid were included.Shoot of wine bamboo had a special taste for its lower tannin content and higher aspartic acid and glutamic acid contents.Synthetically,short time of plastic film mulching showed to be a method to provide the necessary soil water and mean temperature and do good for development and soil quality though winter.展开更多
Introduction:Dispersed trees such as Oxytenanthera abyssinica(A.Rich.)and Dalbergia melanoxylon(Guill.&Perr.)which are objectively maintained or planted on farmland provide a significant contribution to soil ferti...Introduction:Dispersed trees such as Oxytenanthera abyssinica(A.Rich.)and Dalbergia melanoxylon(Guill.&Perr.)which are objectively maintained or planted on farmland provide a significant contribution to soil fertility improvement.However,there was no quantitative information on the level of soil nutrient additions of these trees to the soil system.Methods:This study was conducted on the farmers’fields in Kafta Humera district,Tigray region(northern Ethiopia),where mature stands of O.abyssinica and D.melanoxylon trees exist.Radial distance-based soil sampling(under the canopy,near to canopy,and far from canopy)was adopted to quantify the role of these trees on soil fertility improvement.Soil parameters tested were soil reaction(pH),total nitrogen(TN),available phosphorus(AvP),electrical conductivity(EC),cation exchange capacity(CEC),and organic carbon(OC).Results:There was a negative linear relationship between the radial distance of the O.abyssinica tree trunk and soil TN,OC,CEC,and AvP contents but not for pH.Similarly,negative linear relationship between distance from D.melanoxylon and TN,OC,and AvP was obtained.The average total nitrogen(0.26%and 0.13%),available phosphorus(7.21 ppm and 6.37 ppm),and organic carbon(1.73%and 1.02%)contents were respectively higher under the tree canopies of O.abyssinica and D.melanoxylon compared with the adjacent open canopies.The amount of soil OC,TN,AvP,and CEC under O.abyssinica tree species was also significantly higher by 69%,100%,13%,and 42%compared to that of D.melanoxylon tree species.However,the amount of EC and soil pH was significantly lower by 57%and 19%,respectively.Conclusion:In general,O.abyssinica and D.melanoxylon added a significant amount of nutrients to the soil.Thus,retaining these important tree species on farmland played a positive role in replenishing soil fertility for resource-constrained households so as to reduce chemical fertilizer amendments.展开更多
基金The authors acknowledge the financial support from Tigray Agricultural Research Institute(Mekelle Agricultural Research Center).
文摘Introduction:Climate change will either improve,reduce,or shift its appropriate climatic habitat of a particular species,which could result in shifts from its geographical range.Predicting the potential distribution through MaxEnt modeling has been developed as an appropriate tool for assessing habitat distribution and resource conservation to protect bamboo species.Methods:Our objective is to model the current and future distribution of Oxytenanthera abyssinica(A.Richard)based on three representative concentration pathways(RCP)(RCP2.6,RCP4.5,and RCP8.5)for 2050s and 2070s using a maximum entropy model(MaxEnt)in Northern Ethiopia.For modeling procedure,77 occurrence records and 11 variables were retained to simulate the current and future distributions of Oxytenanthera abyssinica in Northern Ethiopia.To evaluate the performance of the model,the area under the receiver operating characteristic(ROC)curve(AUC)was used.Results:All of the AUCs(area under curves)were greater than 0.900,thereby placing these models in the“excellent”category.The jackknife test also showed that precipitation of the coldest quarter(Bio19)and precipitation of the warmest quarter(Bio18)contributed 66.8%and 54.7%to the model.From the area of current distribution,1367.51 km2(2.52%),7226.28 km2(13.29%),and 5377.26 km2(9.89%)of the study area were recognized as high,good,and moderate potential habitats of Oxytenanthera abyssinica in Northern Ethiopia,and the high potential area was mainly concentrated in Tanqua Abergele(0.70%),Kola Temben(0.65%),Tselemti(0.60%),and Tsegede(0.31%).Kafta Humera was also the largest good potential area,which accounts for 2.75%.Compared to the current distribution,the total area of the high potential regions and good potential regions for Oxytenanthera abyssinica under the three RCPs(RCP2.6,RCP4.5,and RCP8.5)would increase in the 2050s and 2070s.However,the total area of the least potential regions under the three RCPs(RCP2.6,RCP4.5,and RCP8.5)in 2050s and 2070s would decrease.Conclusion:This study can provide vital information for the protection,management,and sustainable use of Oxytenanthera abyssinica,the resource to address the global climate challenges.
文摘The aim of this paper is to provide the data that the transplant advantage in southwest aridity area of China so that shoot’s trace element and nutritional components of wine bamboo,Oxytenanthera braunii,through the winter especially under plastic film mulching condition were measured.The results showed that plastic film mulching could precede in time of shoot germination and enhance the shoot quality such as improving absorbability of trace element,increasing content of protein,sugar,coarse fiber and majority of amino acid.And also,it could accelerate the development of shoot responding to the difference of base diameter.Wine bamboo’s trace element was rich,and the content of crude fat and sugar were higher compared with the shoot of Phyllostachys edulis,P.edulis cv.pachyloen and Dendrocalamus brandisii with the closer relationship that the excreting sap contained about 5% alcohol through new cutting stem.Wine bamboo germinated shoots in whole year at Mojiang Base if mother plant could absorb enough nutrition resulting in great consumption of nutriment and physiological turbulence like decreasing amino acid content under an inaptitude condition.So the amino acid content was low which were 1.3%,1.04% under treatment of plastic film mulching and the control respectively,although all kinds of necessary amino acid were included.Shoot of wine bamboo had a special taste for its lower tannin content and higher aspartic acid and glutamic acid contents.Synthetically,short time of plastic film mulching showed to be a method to provide the necessary soil water and mean temperature and do good for development and soil quality though winter.
文摘Introduction:Dispersed trees such as Oxytenanthera abyssinica(A.Rich.)and Dalbergia melanoxylon(Guill.&Perr.)which are objectively maintained or planted on farmland provide a significant contribution to soil fertility improvement.However,there was no quantitative information on the level of soil nutrient additions of these trees to the soil system.Methods:This study was conducted on the farmers’fields in Kafta Humera district,Tigray region(northern Ethiopia),where mature stands of O.abyssinica and D.melanoxylon trees exist.Radial distance-based soil sampling(under the canopy,near to canopy,and far from canopy)was adopted to quantify the role of these trees on soil fertility improvement.Soil parameters tested were soil reaction(pH),total nitrogen(TN),available phosphorus(AvP),electrical conductivity(EC),cation exchange capacity(CEC),and organic carbon(OC).Results:There was a negative linear relationship between the radial distance of the O.abyssinica tree trunk and soil TN,OC,CEC,and AvP contents but not for pH.Similarly,negative linear relationship between distance from D.melanoxylon and TN,OC,and AvP was obtained.The average total nitrogen(0.26%and 0.13%),available phosphorus(7.21 ppm and 6.37 ppm),and organic carbon(1.73%and 1.02%)contents were respectively higher under the tree canopies of O.abyssinica and D.melanoxylon compared with the adjacent open canopies.The amount of soil OC,TN,AvP,and CEC under O.abyssinica tree species was also significantly higher by 69%,100%,13%,and 42%compared to that of D.melanoxylon tree species.However,the amount of EC and soil pH was significantly lower by 57%and 19%,respectively.Conclusion:In general,O.abyssinica and D.melanoxylon added a significant amount of nutrients to the soil.Thus,retaining these important tree species on farmland played a positive role in replenishing soil fertility for resource-constrained households so as to reduce chemical fertilizer amendments.
