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Tea Plantation frost damage Early Warning Using a Two-Fold Method for Temperature Prediction

Phyton-International Journal of Experimental Botany 2022年第10期91卷 2269-2282页

作者： Zhengyu Wu Kaiqiang Li Lin Yuan Jingcheng Zhang Xianfeng Zhou Dongmei Chen Kaihua Wei College of Artificial Intelligence Hangzhou Dianzi UniversityHangzhou310018China School of Information Engineering and Art and Design Zhejiang University of Water Resources and Electric PowerHangzhou310018China

As the source and main producing area of tea in the world, China has formed unique tea culture, and achievedremarkable economic benefits. However, frequent meteorological disasters, particularly low temperature frostdamage in late spring has seriously threatened the growth status of tea trees and caused quality and yield reduction of tea industry. Thus, timely and accurate early warning of frost damage occurrence in specific tea garden isvery important for tea plantation management and economic values. Aiming at the problems existing in currentmeteorological disaster forecasting methods, such as difficulty in obtaining massive meteorological data, largeamount of calculation for predicted models and incomplete information on frost damage occurrence, this paperproposed a two-fold algorithm for short-term and real-time prediction of temperature using field environmentaldata, and temperature trend results from a nearest local weather station for accurate frost damage occurrence leveldetermination, so as to achieve a specific tea garden frost damage occurrence prediction in a microclimate. Timeseries meteorological data collected from a small weather station was used for testing and parameterization of atwo-fold method, and another dataset acquired from Tea Experimental Base of Zhejiang University was furtherused to validate the capability of a two-fold model for frost damage forecasting. Results showed that comparedwith the results of autoregressive integrated moving average (ARIMA) and multiple linear regression (MLR),the proposed two-fold method using a second order Furrier fitting model and a K-Nearest Neighbor model(K = 3) with three days historical temperature data exhibited excellent accuracy for frost damage occurrence prediction on consideration of both model accuracy and computation (98.46% forecasted duration of frost damage,and 95.38% for forecasted temperature at the onset time). For field test in a tea garden, the proposed methodaccurately predicted thre

关键词： Short-term temperature prediction Fourier fitting K-Nearest Neighbor frost damage tea plantation

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Threats and Avoidance Measures of frost damage of‘Shushanggan’Apricot in the Ili River Valley

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Asian Agricultural Research 2021年第5期13卷 26-30页

作者： Guizhi CONG Shuying CHEN Yuping MA Jin WANG You SHI Forestry Academy of Ili Kazak Autonomous Prefecture Ili 835000 China Meteorological Bureau of Ili Kazak Autonomous Prefecture Ili 835000 China

[Objectives]To explore the threat factors of frost damage to‘Shushanggan’Apricot in the Ili River Valley,and to provide measures for avoiding frost damage.[Methods]Based on the meteorological data of the Ili River Valley counties and cities during the 12 years from 2010 to 2021 and using the critical low temperature of‘Shushanggan’Apricot as the main factor,we comprehensively analyzed the threats of low temperature in winter in January and late frost in April in spring in the Ili River Valley.[Results]During the 12 years,there were 4 years of low temperature below the critical(-26—-28℃)of‘Shushanggan’Apricot in the Ili River Valley counties and cities in January,accounting for 33.3%,and a total of 59 *** frequency of occurrence was:Nilka County>Qapqal County>Yining City>Gongliu County>Huocheng County>Khorgos City>Yining County>Tekes County>Xinyuan *** April,there were 9 years with a low temperature below the critical temperature(-0.6℃)flowering and fruit setting of‘Shushanggan’Apricot,accounting for 75%,and a total of 134 *** frequency of occurrence was:Nilka County>Tekes County>Gongliu County>Yining County>Huocheng County>Khorgos City>Xinyuan County>Yining City>Qapqal *** low temperature threats of‘Shushanggan’Apricot suitable cultivation areas were ranked as follows:Nilka County>Gongliu County>Tekes County>Qapqal County>Huocheng County>Yining City>Yining County>Khorgos City>Xinyuan *** with the observation and survey of frost damage on the spot,we comprehensively analyzed and evaluated the cultivation area of‘Shushanggan’Apricot in the Ili River Valley:three counties(Nilka County,Gongliu County,and Tekes County)in the eastern region,except Xinyuan County,suffered frequent late frost damage,are suitable areas for the cultivation of‘Shushanggan’Apricot;three counties and two cities in the western region(Qapqal County,Huocheng County,Yining City,Yining County,Khorgos City)and Xinyuan County in the eastern region are suitable areas for‘Shu

关键词： ‘Shushanggan’Apricot Ili River Valley frost damage Threats Avoidance measures

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Contrast in vulnerability to freezing-induced xylem embolism contributes to divergence in spring phenology between diffuse-and ring-porous temperate trees

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Forest Ecosystems 2022年第6期9卷 734-744页

作者： Ai-Ying Wang Han-Xiao Cui Xue-Wei Gong Jing-Jing Guo Nan Wu Guang-You Hao School of Life Sciences and Engineering Shenyang UniversityShenyang110044LiaoningChina Liaoning Key Laboratory of Urban Integrated Pest Management and Ecological Security College of Life Science and BioengineeringShenyang UniversityShenyang110044LiaoningChina CAS Key Laboratory of Forest Ecology and Management Institute of Applied EcologyChinese Academy of SciencesShenyang110016China University of Chinese Academy of Sciences Beijing100049China Tree Laboratory Shenyang Academy of Landscape-gardeningShenyang110016LiaoningChina

Background:The spring phenology and growth strategy of temperate tree species can be strongly linked to their sensitivity to frosts,which deserve more profound investigations under the background of climate warming particularly considering the advancement of spring phenology as well as the increase in frequency and intensity of spring cold ***:Spring phenologies,stem radial growth characteristics,frost sensitivity of leaves and stem hydraulic systems were studied in five diffuse-porous and five ring-porous temperate tree species under a common garden ***:The results showed that the spring leaf phenology of the diffuse-porous species was one to two weeks earlier than that of the ring-porous *** ring-porous species had significantly higher stem hydraulic conductivity than the diffuse-porous species(1.81 and 0.95 kg·m^(-1)·s^(-1)·MPa^(-1),Pfrosts,which may at least be partially responsible for their divergence in spring phenology and growth strategy and can potentially lead to di

关键词： Diffuse-porous trees Freeze-thaw cycle frost damage Ring-porous trees Spring phenology Xylem embolism

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Tea leaf’s microstructure and ultrastructure response to low temperature in indicating critical damage temperature

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Information Processing in Agriculture 2019年第2期6卷 247-254页

作者： Yongzong Lu Yongguang Hu Richard LSnyder Eric RKent Key Laboratory of Modern Agricultural Equipment and Technology Ministry of Education Jiangsu ProvinceJiangsu UniversityZhenjiangJiangsu 212013China Department of Land Air and Water ResourcesUniversity of CaliforniaDavisDavis 95616USA Department of Plant Sciences University of CaliforniaDavisDavis 95616USA

To find out the critical damage temperature of tea leaf,a new method of subzero treatment was provided by fitting the air temperature data from six heavy frost ***,the study explored the characteristics of Fuding Dabai tea plant response to low temperature stress of 2,0,2,4,8,10 and15C by observing the microstructure and ultrastructure changes of the *** samples were collected in an ambient temperature of 8.6C which served as *** electron microscopy(SEM)and transmission electron microscopy(TEM)were used to observe the microstructure and ultrastructure of stomata and *** observation results indicated that stomata of tea leaves have an obvious low temperature stress when the temperature was lower than2*** extent of opening of the stomata increased and enhanced guard cell protection of tea leaves against cold ***,dehydration,shrinkage and deformation of cells occurred as the temperature decreased from2C to15*** observations showed that the cell nucleus,cell walls,chloroplasts and mitochondria all had normal structure at a temperature of 8.6C where the membrane and granum lamella were clearly *** the temperature decreased to2C,the membrane system of tea leaf was the first to be damaged and the cell walls became ***,the leaf microstructure and ultrastructure showed obvious changes at2C,which might define the critical damage temperature for freeze damage of Fuding Dabai *** strategy based this critical damage temperature is useful for wind machine frost protection in tea fields within the Yangtze River region.

关键词： frost damage Freeze injury Chill injury frost protection

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Sprinkler irrigation system for tea frost protection and the application effect

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International Journal of Agricultural and Biological Engineering 2016年第5期9卷 17-23页

作者： Hu Yongguang Zhao Chen Liu Pengfei Asante Eric Amoah Li Pingping Key Laboratory of Modern Agricultural Equipment and Technology Jiangsu UniversityZhenjiang 212013China College of Biology and the Environment Nanjing Forestry UniversityNanjing 210037China

A sprinkler irrigation system was designed and applied for a tea field to achieve frost protection through latent heat release when water turning into *** protection effects during night were tested at different irrigation application rates by monitoring air temperature around tea canopy(Tc).Temperature sensors were arranged at different distances from the *** preliminary results showed that,when the sprinkler system worked continuously at the application rate of 2-4 mm/h before sunrise,tea canopy was covered with ice and Tc remained around 0℃,preventing tea plants from frost *** no more temperature rise was obviously observed at the application rates above 4 mm/h,which means less cost *** system was stopped after sunrise when background air temperature rose back to 0℃and Tc increased by 2.2℃in one hour,while Tc of non-irrigated area increased by 4.8℃,which might cause thawing injuries to tea *** leaf surface temperature was lower than Tc,and the difference between the leaf surface temperature and Tc decreased with the increase of application ***,the sprinkler irrigation system could achieve tea frost protection,and the recommended application rate was 2-4 mm/h for better protection *** system should keep running throughout frost night till half an hour after *** start and stop of the sprinkler irrigation system should be controlled based on Tc.

关键词： sprinkler irrigation frost protection Camellia Sinensis L application rate temperature rise frost damage

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Digital surface model applied to unmanned aerial vehicle based photogrammetry to assess potential biotic or abiotic effects on grapevine canopies

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International Journal of Agricultural and Biological Engineering 2016年第6期9卷 119-130页

作者： Su Baofeng Xue Jinru Xie Chunyu Fang Yulin Song Yuyang Sigfredo Fuentes College of Mechanical and Electronic Engineering Northwest A&F UniversityYangling 712100China College of Enology Northwest A&F UniversityYangling 712100China Faculty of Veterinary and Agricultural Sciences University of MelbourneParkville 3010Australia

Accurate data acquisition and analysis to obtain crop canopy information are critical steps to understand plant growth dynamics and to assess the potential impacts of biotic or abiotic stresses on plant development.A versatile and easy to use monitoring system will allow researchers and growers to improve the follow-up management strategies within farms once potential problems have been *** study reviewed existing remote sensing platforms and relevant information applied to crops and specifically grapevines to equip a simple Unmanned Aerial Vehicle(UAV)using a visible high definition RGB *** objective of the proposed Unmanned Aerial System(UAS)was to implement a Digital Surface Model(DSM)in order to obtain accurate information about the affected or missing grapevines that can be attributed to potential biotic or abiotic stress *** analysis process started with a three-dimensional(3D)reconstruction from the RGB images collected from grapevines using the UAS and the Structure from Motion(SfM)technique to obtain the DSM applied on a per-plant ***,the DSM was expressed as greyscale images according to the halftone technique to finally extract the information of affected and missing grapevines using computer vision algorithms based on canopy cover measurement and *** validate the automated method proposed,each grapevine row was visually inspected within the study *** inspection was then compared to the digital assessment using the proposed UAS in order to validate calculations of affected and missing grapevines for the whole studied *** showed that the percentage of affected and missing grapevines was 9.5%and 7.3%,respectively from the area ***,for this specific study,the abiotic stress that affected the experimental vineyard(frost)impacted a total of 16.8%of *** study provided a new method for automatically surveying affected or missing grapevines in the field and an evaluation tool fo

关键词： remote sensing canopy cover viticultural management frost damage digital surface model

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Research on Anti-freezing Technology for Highway Project in Northeast Cold Area

Research on Anti-freezing Technology for Highway Project in ...

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4～(th) International Conference on Road & Airfield Pavement Technology

作者： JinXiangqiu Zhang Jian LiDazhong HouPingnan Jilin Provincial Expressway Construction Headquarters Changji Office

＜正＞ Jilin Province is located in northeast part of China, it belongs to the cold frozen area. Highway projects are mostly built in mountainous or hilly terrain, there are six months of frozen period during one year and the effective construction period is only half year. The maximum depth of frost in hilly area is 2.5m, some parts are covered with snow throughout the year, and the seasonal temperature difference is quite big, maximum temperature difference is more than 70 degrees. Under this condition, the expressway will be easily damaged by frost heave, therefore, there is a need for us to solve the problem of frost damage and fred out anti-freezing methods.

关键词： highway frost damage prevention technology

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THE MICRO ICE LENS MODEL OF frost ATTACK -BASICS AND CONSEQUENCES FOR TESTING AND APPLICATION

THE MICRO ICE LENS MODEL OF FROST ATTACK -BASICS AND CONSEQU...

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第五届水泥与混凝土国际会议

作者： Max J. Setzer IBPM-Institute of Building Physics and Materials Science University of Essen45117 EssenGermany

＜正＞It is shown that frost attack leads primarily to an artificial frost suction far beyond maximum suction under non frost condition. The reason is that due to the sub-microscopic surface structure of gel 3 phases liquid, ice and vapour coexist stably far below bulk triple point. The effect is explained by the micro-ice-lens model based on surface thermodynamics. The consequences lead to improved test procedures CDF and CIF test （RILEM Recommendations）.The results prove both the model and its application in testing.

关键词： frost action frost damage micro ice lens CDF CIF test

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Evaluation of Hemarthria compressavarieties at a frost-prone site in up-land areas of South-west China

Evaluation of Hemarthria compressavarieties at a frost-prone...

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中国—澳大利亚可持续性草地管理研讨会

作者： CH.H.Yang~(1 2) J.G.Han~(1*) L.ZH.Chen~2 SH.M.Su~2 X.Q.Zhang~2 1 Institute of Animal Sciences Chinese Academy of Agricultural Sciences Beijing 2 Department of Grassland Science Animal Science and Technological College Sichuan Agricultural University Ya’an China

＜正＞Hemarthria compressa accessions ’Chonggao’,’Guangyi’,’Yaan’,H031 and H042 were planted on a up-land areas of Tianquan,Sichuan Province,south-west china in 2006 using stem pieces as propagules and irrigation to promote *** weedy conditions the coarse-stemmed lines established in 8 months,whereas the others two fine-stemmed lines had to be replanted with turfs to obtain satisfactory establishment which took more than 1 *** 2006-2007 there were no damaging frosts and all lines had high annual dry matter（DM） yields of up to 25 and 23 t/ha under mowing heights of 5 and 10 cm *** to -4.1℃in winter 2007 severely damaged ’Chonggao’ and ’Guangyi’ irrespective of mowing height and their 2007-2008 yields were reduced to 13-16t DM/*** frosts had only minor effects on H031 and H042 and their yields remained high. ’Yaan’rated intermediate in response to 2007 *** winter 2008 ’Chonggao’,’Guangyi’were eliminated by frosts,whereas H031 and H042 were severely damaged by frosts under 5 cm mowing but were little affected under 10 cm mowing *** none of the five Hemarthrias was completely winter-hardy,the results suggested that ’Yaan’ could be grown at frost-prone sites if close grazing was avoided.

关键词： Hemarthria compressa cut height winter hardiness summer production frost damage plant establishment vegetative propagation

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