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Differences and similarities in radial growth of Betula species to climate change

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Journal of Forestry Research 2024年第2期35卷 176-187页

作者： Di Liu Yang An Zhao Li Zhihui Wang Yinghui Zhao Xiaochun Wang center for ecological Research Key Laboratory of Sustainable Forest Ecosystem ManagementMinistry of EducationCollege of ForestryNortheast Forestry UniversityHarbin 150040People’s Republic of China Changan Park in Shijiazhuang Shijiazhuang 050000People’s Republic of China Shijiazhuang Landscape Greening Engineering Project Construction center Shijiazhuang 050000People’s Republic of China heilongjiang Institute of meteorological Science Harbin 150030People’s Republic of China School of Life Qufu Normal UniversityQufu 273100People’s Republic of China

Betula platyphylla and Betula costata are important species in mixed broadleaved-Korean pine(Pinus koraiensis)***,the specific ways in which their growth is affected by warm temperatures and drought remain *** address this issue,60 and 62 tree-ring cores of *** and *** were collected in Yichun,*** dendrochronological methods,the response and adaptation of these species to climate change were examined.A“hysteresis effect”was found in the rings of both species,linked to May–September moisture conditions of the previous *** growth of *** was positively correlated with the standardized precipitation-evapotranspiration index(SPEI),the precipitation from September to October of the previous year,and the relative humidity in October of the previous *** of *** is primarily restricted by moisture conditions from September to *** contrast,*** growth is mainly limited by minimum temperatures in May–June of both the previous and current *** droughts,*** had a faster recovery rate compared to *** the context of rising temperatures since 1980,the correlation between *** growth and monthly SPEI became positive and strengthened over time,while the growth of *** showed no conspicuous *** findings suggest that the growth of *** is already affected by warming temperatures,whereas *** may become limited if warming continues or *** change could disrupt the succession of these species,possibly accelerating the succession of pioneer *** results of this research are of great significance for understanding how the growth changes of birch species under warming and drying conditions,and contribute to understanding the structural adaptation of mixed broadleaved-Korean pine(Pinus koraiensis)forests under climate change.

关键词： Tree rings Betula platyphylla Betula costata Climate response Moving correlation Extreme drought

Quantitative Precipitation Estimation Using X-band Phased Array Weather Radar

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meteorological and Environmental Research 2024年第4期15卷 29-31页

作者： Shaoyu HOU Xuejiao CHEN Chunnan SUO Xiangfeng HU Hebei provincial Weather Modification center Shijiazhuang 051432China China meteorological Administration Xiong an Atmospheric Boundary Layer Key Laboratory Xiong an New Area 071000China Hebei Xiong an New Area meteorological Service Xiong an New Area 070001China Hebei Cangzhou meteorological Observatory Cangzhou 061000China Hebei Key Laboratory of Meteorology and ecological Environment Shijiazhuang 050021China

This study utilized data from an X-band phased array weather radar and ground-based rain gauge observations to conduct a quantitative precipitation estimation(QPE)analysis of a heavy rainfall event in Xiong an New Area from 20:00 on August 21 to 07:00 on August 22,*** analysis applied the Z-R relationship method for radar-based precipitation estimation and evaluated the QPE algorithm s performance using scatter density plots and binary classification *** results indicated that the QPE algorithm accurately estimates light to moderate rainfall but significantly underestimates heavy *** study identified disparities in the predictive accuracy of the QPE algorithm across various precipitation intensity ranges,offering essential insights for the further refinement of QPE techniques.

关键词： X-band phased array radar Quantitative precipitation estimation

Impact of climate and human activity on NDVI of various vegetation types in the Three-River Source Region, China

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Journal of Arid Land 2024年第8期16卷 1080-1097页

作者： LU Qing KANG Haili ZHANG Fuqing XIA Yuanping YAN Bing Research center of Resource and Environment Economics East China University of TechnologyNanchang 330013China Jiangxi Key Laboratory of Watershed ecological Process and Information East China University of TechnologyNanchang 330013China School of Surveying and Geoinformation Engineering East China University of TechnologyNanchang 330013China Nanchang Key Laboratory of Landscape Process and Territorial Spatial ecological Restoration East China University of TechnologyNanchang 330013China Institute of Energy Research Jiangxi Academy of SciencesNanchang 330096China

The Three-River Source Region(TRSR)in China holds a vital position and exhibits an irreplaceable strategic importance in ecological preservation at the national *** the basis of an in-depth study of the vegetation evolution in the TRSR from 2000 to 2022,we conducted a detailed analysis of the feedback mechanism of vegetation growth to climate change and human activity for different vegetation *** the growing season,the spatiotemporal variations of normalized difference vegetation index(NDVI)for different vegetation types in the TRSR were analyzed using the Moderate Resolution Imaging Spectroradiometer(MODIS)-NDVI data and meteorological data from 2000 to *** addition,the response characteristics of vegetation to temperature,precipitation,and human activity were assessed using trend analysis,partial correlation analysis,and residual *** indicated that,after in-depth research,from 2000 to 2022,the TRSR's average NDVI during the growing season was *** preliminary ranking of the average NDVI for different vegetation types was as follows:shrubland(0.5762)>forest(0.5443)>meadow(0.4219)>highland vegetation(0.2223)>steppe(0.2159).The NDVI during the growing season exhibited a fluctuating growth trend,with an average growth rate of 0.0018/10a(P<0.01).Notably,forests displayed a significant development trend throughout the growing season,possessing the fastest rate of change in NDVI(0.0028/10a).Moreover,the upward trends in NDVI for forests and steppes exhibited extensive spatial distributions,with significant increases accounting for 95.23%and 93.80%,*** sensitivity to precipitation was significantly enhanced in other vegetation types other than highland *** contrast,steppes,meadows,and highland vegetation demonstrated relatively high vulnerability to temperature fluctuations.A further detailed analysis revealed that climate change had a significant positive impact on the TRSR from 2000 to 2022,particularly in its

关键词： growing season normalized difference vegetation index(NDVI) highland vegetation trend analysis partial correlation analysis residual analysis contribution rate

Changes of spring wind erosion based on wind erosion climate factor in the black soil region of Northeast China

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Journal of Mountain Science 2023年第6期20卷 1712-1724页

作者： YAN Ping JI Sheng-tai LI Xiu-fen ZHU Hai-xia WANG Liang-liang ZHAI Mo WANG Ping ZHAO Hui-ying heilongjiang Institute of meteorological Sciences Harbin 150030China Innovation and Open Laboratory of Eco-meteorology in Northeast China China Meteorological AdministrationHarbin 150030China heilongjiang ecological meteorological center Harbin 150030China

The dry and windy climate and low ground cover in spring in the black soil region of Northeast China make the soil strongly affected by wind erosion,which seriously threatens the food security and ecological security of this *** this paper,based on the daily observation data of 124 meteorological stations in study area from 1961 to 2020,seasonal and monthly wind erosion climate factor(C)in spring(March to May)were calculated by using the method proposed by the Food and Agriculture Organization of the United Nations(FAO),the wind erosion characterization in spring were systematically analyzed based on C by various statistical analysis *** results showed that in the past 60 years,spring wind erosion climate factor(CSp)and monthly C of the whole region and each province(region)all showed highly significant decreasing trend,but they began to show rebounded trend in the middle or late *** of the study area showed a significant upward trend since 2008 with an increase of 4.59(10a)^(-1).The main contributors to this upward trend are the changes of C in March and in *** the four provinces(regions),CSp in heilongjiang,Jilin,Liaoning and eastern Inner Mongolia all showed rebounded since 2008,2011,2008 and 2009,*** rebounded trend of CSp in eastern Inner Mongolia was the most obvious with a tendency rate of 11.27(10a)^(-1),and its mutation occurred after *** rebound trend of CSp in heilongjiang Province takes the second place,with a trend rate of 4.72(10a)^(-1),but there’s no obvious time mutation *** spatial characteristics of CSpand monthly C are similar,showing decreasing characteristics centered on the typical black soil belt of Northeast *** with 1961-1990,in the period from 1991 to 2020,the proportion of high value areas(CSp>35,monthly C>10)has decreased to varying degrees,while the proportion of low value areas(CSp≤10,monthly C≤4)has *** trends of seasonal and monthly C in 82.2%~87.7%of the

关键词： Wind erosion climate erosivity Spatiotemporal 1characteristics Climate change Rebounded trend Typical black soil region Northeast China

Comparison of Submicron Particles at a Rural and an Urban Site in the North China Plain during the December 2016 Heavy Pollution Episodes

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Journal of meteorological Research 2018年第1期32卷 26-37页

作者： Xiaojing SHEN Junying SUN Xiaoye ZHANG Yangmei ZHANG Yaqiang WANG Kaiyan TAN Peng WANG Lu ZHANG Xuefei QI Haochi CHE Zhouxiang ZHANG Junting ZHONG Huarong ZHAO Sanxue REN State Key Laboratory of Severe Weather/Key Laboratory of Atmospheric Chemistry of China meteorological Administration Chinese Academy of Meteorological Sciences Integrated ecological–meteorological Observation and Experimental Station Chinese Academy of Meteorological Sciences Longfengshan Atmospheric Background Regional Station Heilongjiang Provincial Meteorological Bureau

An extensive field experiment for measurement of physical and chemical properties of aerosols was conducted at an urban site in the Chinese Academy of meteorological Sciences（CAMS） in Beijing and at a rural site in Gucheng（GC）, Hebei Province in December 2016. This paper compares the number size distribution of submicron particle matter（PM1, diameter 〈 1 μm） between the two sites. The results show that the mean PM1 number concentration at GC was twice that at CAMS, and the mass concentration was three times the amount at CAMS. It is found that the accumulation mode（100–850 nm） particles constituted the largest fraction of PM1 at GC, which was significantly correlated with the local coal combustion, as confirmed by a significant relationship between the accumulation mode and the absorption coefficient of soot particles. The high PM1 concentration at GC prevented the occurrence of new particle formation（NPF） events, while eight such events were observed at CAMS. During the NPF events, the mass fraction of sulfate increased significantly, indicating that sulfate played an important role in NPF. The contribution of regional transport to PM1 mass concentration was approximately 50% at both sites, same as that of the local emission. However, during the red-alert period when emission control took place, the contribution of regional transport was notably higher.

关键词： particle number size distribution new particle formation severe haze-fog events Beijing-Tianjin-Hebei area Jing-Jin-Ji region submicron particles

Advances in ecological Applications of Fengyun Satellite Data

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Journal of meteorological Research 2021年第5期35卷 743-758页

作者： Xiuzhen HAN Hao GAO Jun YANG Yachun LI Weicheng GENG National Satellite meteorological center China Meteorological AdministrationBeijing 100081 Jiangsu Climate center Jiangsu Provincial Meteorological BureauNanjing 210008

In recent years,the remote sensing based on meteorological satellite observations has become an important tool for assessing global ecological *** the early 2000,Fengyun(FY)satellite data have been widely used to derive the key parameters of ecological environment in *** integrated earth-observation system has been developed in China through using FY satellite data,including retrievals the key ecological parameters as well as to constructions of long-term data records of vegetation index,land surface temperature,net primary production,vegetation health index,and so *** progress has thus been made in the application and service for prevention of air pollution,management and control of ecological redline,ecological monitoring for the Belt and Road Initiative,and assessment of ecological environment for human *** order to monitor the ecological parameters in real time and with a full dynamic coverage,it is necessary to improve the technology in application of ecological remote sensing from meteorological satellites,and further enhance the ecological meteorological service.

关键词： Fengyun satellite ecological environment remote sensing assessing and monitoring operational service

FY-4A LMI Observed Lightning Activity in Super Typhoon Mangkhut(2018)in Comparison with WWLLN Data

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Journal of meteorological Research 2020年第2期34卷 336-352页

作者： Wenjuan ZHANG Wen HUI Weitao LYU Dongjie CAO Pengfei LI Dong ZHENG Xiang FANG Yijun ZHANG State Key Laboratory of Severe Weather Chinese Academy of Meteorological SciencesBeijing 100081 Key Laboratory of Radiometric Calibration and Validation for Environmental Satellites National Satellite Meteorological CenterChina Meteorological AdministrationBeijing 100081 ecological and meteorological center of heilongjiang Province Harbin 150030 Institute of Atmospheric Science Fudan UniversityShanghai 200438

Using lightning observations from the Fengyun-4A Lightning Mapping Imager(FY-4A LMI),best-track data from the Shanghai Typhoon Institute,bright temperature(TBB)data from Himawari-8 satellite,and composite reflectivity(CR)data from the South China radar network,we investigate the spatiotemporal distribution of lightning activity and convective evolution during the landfall of Super Typhoon Mangkhut,the strongest landing typhoon in China *** stages of active total lightning are observed,and differences of lightning characteristics between the inner core and the outer rainbands are *** onset of inner-core lightning outbreak is about 4 h ahead of the maximum intensity of the storm,providing indicative information on the change of typhoon *** rates in the outer rainbands increase rapidly 12 h before the landfall,and lightning activity is mainly confined in the outer rainbands after the landfall.A good correlation in hourly variation is shown between lightning rates from the LMI and TBBs from the *** averaged TBB within the inner core reaches its minimum(–80℃)when the innercore lightning outbreak occurs,indicating the occurrence and enhancement of deep convection *** locations observed by the LMI has a good spatial correspondence with regions of low TBBs and high CRs,revealing the monitoring capability of the LMI to lightning activity and deep convection in landing *** between the World Wide Lightning Location Network(WWLLN)and the LMI reveal that the spatial distribution,temporal evolution,and radial pattern of lightning activity in Mangkhut observed by the two systems are ***,due to the detection capability of total lightning,the LMI has advantages in revealing the higher ratio of intra-cloud lightning within the inner core in *** continuous and real-time observation ofFY-4ALMI provides an unprecedented platform for monitoring total lightning and deep convection in landing

关键词： FY-4A LMI lightning convection landing typhoon WWLLN Mangkhut

Effects of background fertilization followed by co-application of two kinds of bacteria on soil nutrient content and rice yield in Northeast China

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International Journal of Agricultural and Biological Engineering 2020年第2期13卷 154-162页

作者： Tao Sun Yuyingnan Liu Shuang Wu Jizhou Zhang Bin Qu Jinggang Xu College of Resources and Environment Northeast Agricultural UniversityHarbin 150030China heilongjiang provincial ecological meteorological center Harbin 150030China Institute of Natural Resources and Ecology Heilongjiang Academy of SciencesHarbin 150040China College of Engineering Northeast Agriculture UniversityHarbin 150030China

With the improvement of living standards,people pay more and more attention to the quality and safety of *** agents are favored by the public because they can activate the nutrient supply in the soil,and reduce the residue and application amount of chemical fertilizers and *** on the conventional fertilization in the field,Bacillus mucilaginosus and Aspergillus niger were applied,Bacillus mucilaginosus was inoculated at four levels in the paddy soil in the cold region of heilongjiang Province of *** effects of different proportions of Bacillus mucilaginosus and Aspergillus niger on the number of soil microorganisms,enzyme activity,microbial biomass,soil biochemical intensity,soil nutrient content,plant nutrient content and yield were studied,and the effects on the plant nutrient content of rice and the nutrient dynamics were *** results showed that a 2.62%-21.20%higher yield of rice obtained from co-application treatments compared with that of the control-blank ***,the highest yield obtained(10736±65 kg/hm^(2))suggested that the optimized values for the two bacteria applied were 120×10^(11) CFU/hm^(2) for Bacillus mucilaginosus and 15×10^(11) CFU/hm^(2) for Aspergillus *** mucilaginosus can decompose minerals in soil,dissolve potassium and silicon,decompose apatite and release phosphorus into *** niger can transform the phosphate which cannot be absorbed by plants into soluble phosphate which can be directly absorbed by plants by producing non-volatile *** particular,Bacillus mucilaginosus and Aspergillus niger have synergistic effect,and their combined application effect is greater than that of two bacteria ***-application promoted the release of soil soluble silicon,and then increased the silicon content of *** the same time,soil microorganism,microbial biomass,enzyme activity and biochemical activity all increased *** study provides an effective way to

关键词： microbial inoculants microbial fertilizer rice co-application Bacillus mucilaginosus Aspergillus niger nutrients

The eff ect of Rhizophagus irregularis on salt stress tolerance of Elaeagnus angustifolia roots

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Journal of Forestry Research 2020年第6期31卷 2063-2073页

作者： Wenyuan He Xiaoxu Fan Zixin Zhou Huanhuan Zhang Xiang Gao Fuqiang Song Gui Geng Engineering Research center of Agricultural Microbiology Technology Ministry of EducationHeilongjiang UniversityHarbin 150080China heilongjiang provincial Key Laboratory of ecological Restoration and Resource Utilization for Cold Region School of Life SciencesHeilongjiang UniversityHarbin 150080China

We assessed the eff ects of arbuscular mycorrhizal fungi(AMF)Rhizophagus irregularis inoculation on salt stress tolerance in roots of the drought-tolerant plant Elaeagnus *** studied a plant growth index,spore density and hyphal length density of AMF,the Na+contents and ultrastructure of root cells,as well as rhizosphere soil enzyme activities of mycorrhizal and non-mycorrhizal *** seedlings under diff erent salt *** salt stress,growth of *** with mycorrhizal inoculation was higher than that of non-inoculated *** spore density and hyphal length density decreased signifi cantly under salt stress in rhizosphere soil of mycorrhizal *** seedlings(p<0.05).The root cells of *** seedlings inoculated with *** at 300 mmol L−1 salt had more organelles,greater integrity,and lower root Na+contents than those of non-inoculated *** addition,the results showed notably higher activities of catalase,phosphatase,urease and saccharase in rhizosphere soil of the mycorrhizal seedlings in response to salinity compared to those of the non-mycorrhizal ***,AMF inoculation could enhance salt stress tolerance in roots of ***.

关键词： Salt stress Arbuscular mycorrhizal fungi Elaeagnus angustifolia Na+content Ultrastructure of root cell Soil enzyme