检索结果-南通市图书馆

Joint Monitoring of Ground and Sky for Cereal Crops Based on Scatterometer Measurement and ASAR Images

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Electronic Science and Technology 2019年第3期17卷 278-288页

作者： Lei He Feng-Jin Xiao the School of Software Engineering Chengdu University of Information TechnologyChengdu 610225 National Climate Center Beijing 100081

The joint monitoring of the ground and sky for Cereal crops based on microwave data has become a popular method for researches on earth surface objects. Focused on the sensitivity of backscatter from the scatterometer measurement and advanced synthetic aperture radar (ASAR) images to Cereal parameters of rice, nine acquisitions, including rice parameters related eco-physiological variables and scattering coefficients, have been carried over the paddy field corresponding to rice growth stages. This paper analyzes the relationship between the corresponding backscatter to the Cereal parameters based on the measurement at the interesting bands, polarizations, and incidence angels. Further, a modified water cloud model is built based on the ground measurement and advanced integrated equation model (AIEM), and then Cereal parameters from ASAR images are retrieved and verified. The research results show that the sensitivity of backscatter to Cereals from the sensor of the radar scatterometer could be helpful to build the retrieve model for synthetic aperture radar (SAR) images, which can achieve the scientific goals of the joint monitoring of ground and sky for Cereal crops.

关键词： Backscatter Cereal joint monitoring scatterometer synthetic aperture radar(SAR)

Physiology and defense responses of wheat to the infestation of different Cereal aphids

在线全文

学校读者我要写书评

暂无评论

Journal of Integrative Agriculture 2020年第6期19卷 1464-1474页

作者： LIU Fang-hua KANG Zhi-wei TAN Xiao-ling FAN Yong-liang TIAN Hong-gang LIU Tongxian State Key Laboratory of Crop Stress Biology for Arid Areas Northwest A&F UniversityYangling 712100P.R.China Key Laboratory of Northwest Loess Plateau Crop Pest Management Ministry of Agriculture and Rural AffairsNorthwest A&F UniversityYangling 712100P.R.China State Key Laboratory of Integrated Management of Pest and Rodents Institute of ZoologyChinese Academy of SciencesBeijing 100101P.R.China State Key Laboratory for Biology of Plant Diseases and Insect Pests Institute of Plant ProtectionChinese Academy of Agricultural SciencesBeijing 100193P.R.China

Cereal aphids are major insect pests of wheat,which cause significant damages to wheat production.Previous studies mainly focused on the resista nee of differe nt wheat varieties to one specific aphid species.However,reports on the physiology and defense responses of wheat to different Cereal aphids are basically lacking.In this work,we studied the feeding behavior of three Cereal aphids:the grain aphid,Sitobion avenae(Fabricius),the greenbugs,Schizaphis graminum(Ron dani),and the bird cherry-oat aphid,Rhopalosiphum padi(Linn aeus)on win ter wheat,and the physiology and defense responses of wheat to the infestation of these Cereal aphids with focus on how these Cereal aphids utilize divergent strategies to optimize their nutrition requirement from wheat leaves.Our results indicated that S.graminum and R.padi were better adapted to penetrating phloem tissue and to collect more nutrition than S.avenae.The harm on wheat physiology committed by S.graminum and R.padi was severer than that by S.avenae,through reducing chlorophyll concentration and interfering metabolism genes.Furthermore,Cereal aphids manipulated the plant nutrition metabolism by increasing the relative concentration of major amino acids and percentage of essential amino acids.In addition,different Cereal aphids triggered specific defense response in wheat.All of these results suggested that different Cereal aphids utilize diverge nt strategies to cha nge the physiological and defe nse resp on ses of their host plants in order to optimize their nutriti on absorption and requireme nt.These fin dings not only exte nd our current knowledge on the insect-pla nt in teractions but also provide useful clues to develop no vel biotech no logical strategies for enhancing the resistance and toleranee of crop plants against phloem-feeding insects.

关键词： Cereal aphids feeding behavior nutrition physiology defense response

Effects of Cereal fiber on bowel function: A systematic review of intervention trials

在线全文

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2015年第29期21卷 8952-8963页

作者： Jan de Vries Paige E Miller Kristin Verbeke De Vries Nutrition Solutions Inc. Center for Epidemiology Biostatistics and Computational Biology Exponent Inc. Nutrition and Food Service Edward Hines Jr. VA Hospital Hines Department of Clinical and Experimental Medicine KU Leuven

AIM: To comprehensively review and quantitatively summarize results from intervention studies that examined the effects of intact Cereal dietary fiber on parameters of bowel function. METHODS: A systematic literature search was conducted using Pub Med and EMBASE. Supplementary literature searches included screening reference lists from relevant studies and reviews. Eligible outcomes were stool wet and dry weight, percentage water in stools, stool frequency and consistency, and total transit time. Weighted regression analyses generated mean change(± SD) in these measures per g/d of dietary fiber. RESULTS: Sixty-five intervention studies among generally healthy populations were identified. A quantitative examination of the effects of non-wheat sources of intact Cereal dietary fibers was not possible due to an insufficient number of studies. Weighted regression analyses demonstrated that each extra g/d of wheat fiber increased total stool weight by 3.7 ± 0.09 g/d(P < 0.0001; 95%CI: 3.50-3.84), dry stool weight by 0.75 ± 0.03 g/d(P < 0.0001; 95%CI: 0.69-0.82), and stool frequency by 0.004 ± 0.002 times/d(P = 0.0346; 95%CI: 0.0003-0.0078). Transittime decreased by 0.78 ± 0.13 h per additional g/d(P < 0.0001; 95%CI: 0.53-1.04) of wheat fiber among those with an initial transit time greater than 48 h.CONCLUSION: Wheat dietary fiber, and predominately wheat bran dietary fiber, improves measures of bowel function.

关键词： Comprehensive review Dietary fiber Wheat bran Cereal Bowel function

Low-cost experimental application of real-time kinematic positioning for increasing the benefits in Cereal crops

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

International Journal of Agricultural and Biological Engineering 2021年第3期14卷 194-199页

作者： Abdelhamid Tayebi Josefa Gómez Marián Fernández Francisco Sáez de Adana Oscar Gutiérrez Computer Science Department University of AlcaláAlcaláde Henares 28801Spain

Traditional agriculture is facing several challenges worldwide such as increased population growth,rapid forestry and urbanization,resource scarcity,climate change,environmental pollution,competition among different markets.Hence,farmers need to improve productivity in order to maintain the output level.This study attempted to evaluate the benefits of using Real-Time Kinematic(RTK)positioning in precision agriculture through a series of real measurements carried out when farming Cereals.All farming management actions involved in the Cereal crop process(raise fallow,plow,sow,fertilize,mow,and harvest)have been done using an automatic guidance system that has reduced costs.A reduction of 20%has been quantified in the fuel,the amount of fertilizer,the labor costs and the hours of work.Consequently,the environmental impact has been also reduced.An inexpensive system consisting of a reference base station near the field and a mobile unit mounted on the test vehicle has been installed in order to increase the benefits in Cereal crops.Global Navigation Satellite System(GNSS)systems including Global Positioning System(GPS),GLONASS,Galileo and Beidou have been used in the analysis.This research serves as a practical guide to implementing a low-cost guidance system to achieve best management practice.

关键词： real-time kinematic low-cost positioning benefits guidance system Cereal

Remote sensing of quality traits in Cereal and arable production systems:A review

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

The Crop Journal 2024年第1期12卷 45-57页

作者： Zhenhai Li Chengzhi Fan Yu Zhao Xiuliang Jin Raffaele Casa Wenjiang Huang Xiaoyu Song Gerald Blasch Guijun Yang James Taylor Zhenhong Li College of Geodesy and Geomatics Shandong University of Science and TechnologyQingdao 266590ShandongChina Key Laboratory of Quantitative Remote Sensing in Ministry of Agriculture and Rural Affairs Information Technology Research CenterBeijing Academy of Agriculture and Forestry SciencesBeijing 100097China Institute of Crop Sciences Chinese Academy of Agricultural Sciences/Key Laboratory of Crop Physiology and EcologyMinistry of Agriculture and Rural AffairsBeijing 100081China DAFNE Universitàdella TusciaVia San Camillo de Lellis01100 ViterboItaly Key Laboratory of Digital Earth Science Aerospace Information Research InstituteChinese Academy of SciencesBeijing 100094China International Maize and Wheat Improvement Center(CIMMYT) PO Box 5689Addis AbabaEthiopia ITAP Univ.MontpellierINRAEInstitut AgroMontpellier 34000France College of Geological Engineering and Geomatics Chang’an UniversityXi’an 710054ShaanxiChina

Cereal is an essential source of calories and protein for the global population.Accurately predicting Cereal quality before harvest is highly desirable in order to optimise management for farmers,grading harvest and categorised storage for enterprises,future trading prices,and policy planning.The use of remote sensing data with extensive spatial coverage demonstrates some potential in predicting crop quality traits.Many studies have also proposed models and methods for predicting such traits based on multiplatform remote sensing data.In this paper,the key quality traits that are of interest to producers and consumers are introduced.The literature related to grain quality prediction was analyzed in detail,and a review was conducted on remote sensing platforms,commonly used methods,potential gaps,and future trends in crop quality prediction.This review recommends new research directions that go beyond the traditional methods and discusses grain quality retrieval and the associated challenges from the perspective of remote sensing data.

关键词： Remote sensing Quality traits Grain protein Cereal

1993-2017年气候变化对西藏谷物单产的定量影响

在线全文

学校读者我要写书评

暂无评论

Journal of Geographical Sciences 2022年第1期32卷 101-116页

作者：丁锐史文娇 Key Laboratory of Land Surface Pattern and Simulation Institute of Geographic Sciences and Natural Resources ResearchCASBeijing 100101China College of Resources and Environment University of Chinese Academy of SciencesBeijing 100049China

Climate change is a global environmental crisis, but there have been few studies of the effects of climate change on Cereal yields on the Tibetan Plateau. We used data from meteorological stations and statistical yearbooks to assess the impacts of climate change on Cereal yields in Tibet. Three types of statistical models were selected: fixed-effects model, first-difference models, and linear detrending models. We analyzed the impacts of climate change(including the minimum temperature, precipitation, growing degree days and solar radiation) on Cereal yields in Tibet from 1993 to 2017 at the county, prefecture-level city, and autonomous region scales. The results showed that the sensitivity of Cereal yields in Tibet to temperature(minimum temperature and growing degree days) was greater than their sensitivity to precipitation and solar radiation. The joint impacts of climate variables were positive, but the sensitivity and significance varied in different regions. The impacts of minimum temperature, precipitation, and solar radiation were positive in all cities, apart from the negative impacts of growing degree days on Cereal yields in Lhasa. The impacts of climate trends on Cereal yields in Tibet were positive and the results were in the range of 1.5%–4.8%. Among the three types of model, the fixed-effects model was the most robust and the linear detrending model performed better than the first-difference model. The robustness of the first-difference model decreased after adding the interaction terms between different climate variables. Our findings will help in implementing more spatially targeted agricultural adaptations to cope with the impacts of climate change on the agro-ecosystem of the Tibetan Plateau.

关键词： Tibetan Plateau climate change statistical model Cereal yields

Starch biosynthesis in Cereal endosperms: An updated review over the last decade

在线全文

学校读者我要写书评

暂无评论

Plant Communications 2021年第5期2卷 1-22页

作者： Lichun Huang Hongyan Tan Changquan Zhang Qianfeng Li Qiaoquan Liu Jiangsu Key Laboratory of Crop Genomics and Molecular Breeding State Key Laboratory of Hybrid RiceKey Laboratory of Plant Functional Genomics of the Ministry of EducationCollege of AgricultureYangzhou UniversityYangzhou 225009China Co-Innovation Center for Modern Production Technology of Grain Crops of Jiangsu Province Key Laboratory of Crop Genetics and Physiology of Jiangsu ProvinceYangzhou UniversityYangzhou 225009China

Starch is a vital energy source for living organisms and is a key raw material and additive in the food and non-food industries.Starch has received continuous attention in multiple research fields.The endosperm of Cereals(e.g.,rice,corn,wheat,and barley)is the most important site for the synthesis of storage starch.Around 2010,several excellent reviews summarized key progress in various fields of starch research,serving as important references for subsequent research.In the past 10 years,many achievements have been made in the study of starch synthesis and regulation in Cereals.The present review provides an update on research progress in starch synthesis of Cereal endosperms over the past decade,focusing on new enzymes and non-enzymatic proteins involved in starch synthesis,regulatory networks of starch synthesis,and the use of elite alleles of starch synthesis-related genes in Cereal breeding programs.We also provide perspectives on future research directions that will further our understanding of Cereal starch biosynthesis and regulation to support the rational design of ideal quality grain.

关键词： Cereal starch biosynthesis regulation network endosperm development quality improvement

Efficiency of LED lamps used in Cereal crop breeding greenhouses

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

International Journal of Agricultural and Biological Engineering 2022年第2期15卷 75-83页

作者： Piotr Stefański Patrycja Siedlarz-Słowacka Przemysław Matysik Krystyna Rybka Plant Breeding Strzelce Ltd.Co. ul.Główna 2099-307 StrzelcePoland Plant Breeding and Acclimatization Institute-National Research Institute 05-870 RadzikówPoland

LED lamps,which are becoming prevalent in horticulture,are also being installed in greenhouses dedicated to Cereal crop breeding.However,the issue arises with the real efficiency of LED lamps.Besides high-budget programs,the smaller breeding companies in Poland face problems concerning the plant growth under LED lamps and the real costs of their exploitation.The experiment was conducted to compare seven different LED lamps and a high-intensity discharge(HID)lamp with a high-pressure sodium lamp(HPS)used as a control.For studies,two varieties of wheat,barley,and oat species were used.The plants’growth rate was assessed based on elongation growth and earing time.Plants’physiological conditions were evaluated using chlorophyll a(Chl a)fluorescence measured on dark-adapted leaves.The light spectra and intensities of tested lamps in parallel with electricity consumption were also recorded.The results showed that 1)LEDs’physical properties and luminaire construction influence the amount of electricity consumed;2)the Cereal crop species differ in lighting requirements.The less light-sensitive was oat opposite barley,with wheat of moderate sensitivity;3)LED-6 lamp(PlantaLux S.A,Lublin,Poland)based on white diodes enriched by blue ones was the most cost-efficient and most optimal for studied species.

关键词： greenhouse light-emitting diodes cost-effectiveness Cereal Triticum aestivum Hordeum vulgare Avena sativa

A Freight Mode Choice Analysis Using a Binary Logit Model and GIS: The Case of Cereal Grains Transportation in the United States

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Transportation Technologies 2012年第2期2卷 175-188页

作者： Guoqiang Shen Jiahui Wang Division of Regional and City Planning College of Architecture School of Industrial Engineering College of Engineering The University of Oklahoma Norman USA

Mode choice is important in shipping commodities efficiently. This paper develops a binary logit model and a regression model to study the Cereal grains movement by truck and rail in the United States using the publically available Freight Analysis Framework (FAF2.2) database and U.S. highway and networks and TransCAD, a geographic information system with strong transportation modeling capabilities. The binary logit model and the regression model both use the same set of generic variables, including mode split probability, commodity weight, value, network travel time, and fuel cost. The results show that both the binary logit and regression models perform well for Cereal grains transportation in the United States, with the binary logit model yielding overall better estimates with respect to the observed truck and rail mode splits. The two models can be used to study other commodities between two modes and may produce better results if more mode specific variables are used.

关键词： Binary Logit Regression Freight Mode Choice Cereal Grains