Middle China Research Articles

Optimizing screening strategies for coronavirus disease 2019: A study from Middle China

BackgroundCoronavirus disease 2019 (COVID-19) has been highly epidemic in China since January 2020. Rapid detection of the causative agent, severe acute respiratory coronavirus-2 (SARS-CoV-2), is very important due to its high rate of infectivity. This study aimed to clarify the epidemiology and clinical characteristics of COVID-19 outside of Hubei province, China, and to optimize screening strategies for COVID-19 in attempts to contain spread of the virus. MethodsThis retrospective study included all confirmed cases of COVID-19 in Hunan Provincial People's Hospital (Changsha, China) between January 22 and February 15, 2020. All cases were detected using a real-time reverse transcription polymerase chain reaction assay. The epidemiology and clinical characteristic of these cases were investigated according to outcome in attempts to optimize screening strategies for COVID-19. ResultsThere were 24 confirmed cases of COVID-19 in the fever outpatient department of Hunan Provincial People's Hospital. Three patients were asymptomatic, and 3 exhibited mild and 3 moderate disease. There was a family cluster phenomenon. ConclusionIndividuals with COVID-19 can be asymptomatic or exhibit mild manifestations of disease. Close monitoring and an optimized screening strategy for COVID-19 could help deter spread of the virus.

China's urban air quality evaluation with streaming data: A DEA window analysis

After the promotion of urbanization in the past decades, air pollution has become one of the bottlenecks of China's urban development. Kinds of real-time air pollution indicators are recorded by using environmental detection system in China's urban area that produces precious streaming data. The present paper constructs window DEA model to compute the dynamic air quality index after applying hierarchy analysis to resolve the heterogeneity of time varying data. In the section of empirical study, we select the daily data of CO, NO, SO2, PM 2.5 and PM 10 since January 2018 to August 2019 for 360 cities in China which includes 1,092,600 streaming data. Our empirical findings indicate that air pollution is heavily serious in most China' cities, in which more than 95% cities have over emitted air pollution by 30% at least. Chinese urban air quality is significantly affected by the change of month and shows an inverse U-shaped curve relationship in year, while the orders of weeks within month or order of days within week is irrelevant. The provinces with the most urban air pollution concentrate in middle China and from a continuous pollution zone with Shanxi as the center.

Source apportionment of soil contamination based on multivariate receptor and robust geostatistics in a typical rural–urban area, Wuhan city, middle China

AbstractIn this study topsoil samples were collected from 57 sites of Dongxihu District which is a typical Chinese urban–rural combination area, to analyze the causes and effects of 6 heavy elements. (Ni, Pb, As, Cu, Cd, and Hg) Pollution of Enrichment factor, multivariate statistics, geostatistics were adopted to study the spatial pollution pattern and to identify the priority pollutants and regions of concern and sources of studied metals. Most importantly, the study area was creatively divided into central urban, semi-urbanized, and rural areas in accordance with the characteristics of urban development and land use. The results show that the pollution degree of potential ecological risk assessment is Hg>Ni>Cu>As>Cd>Pb, and semi-urban regions> city center> rural areas. Results based on the proposed integrated source identification method indicated that As was probably sourced from agricultural sources (33.99%), Pb was associated with atmospheric deposition (50.11%), Cu was related to industrial source 1 (45.97%), Cd was mainly derived from industrial source 2 (42.97%) and Hg come mainly from industrial source 3 (56.22%). The pollution in semi-urban areas in urbanization need more attention.

Spatio-Temporal Nonstationary Effects of Impact Factors on Industrial Land Price in Industrializing Cities of China

Industrialization has brought about great differences in industrial development and land use demand among different regions and cities, especially in rapidly industrializing countries with a vast territory. In those areas, implementing local-specific policies on industrial land price is of great significance to improve industrial land use efficiency and facilitate the sustainable development of regional economy. Based on the land pricing monition files of 105 industrializing cities, geographically weighted regression (GWR) was applied to detect the spatial variation of the industrial land price and its main impact factors (for example, tax, leased land, population, and location quotient index) in China in 2009, 2011 and 2014. The results show that the relationships were generally spatio-temporally nonstationary. More specifically, while the effect of tax on industrial land price was significantly positive and spatially stable all over China in 2009, the effect varied spatially in the two later studied years, weakened in North and East China and strengthened in South China. The effect of leased land on industrial land price was generally negative; it was very weak in 2009 and 2011 but became negatively strong in most studied cities in 2014, except for a few cities in Middle China. Population had a significant positive effect on industrial land price in the cities of East and Northeast China. For the three studied years, the location quotient index always had negative effect in Bohai Economic Rim and positive effect in Yangtze River Delta Economic Zone, and the negative effect strengthened with time. Meanwhile, the underlying reasons behind the relationships were further analyzed, showing that the spatio-temporal changes of industrial land price are closely correlated with the population mobility, industrial agglomeration, government intervention and economic situation.

President's Page

SEG has addressed the challenges of meeting the needs of a global membership with the opening of regional offices in the Middle East, China, and Malaysia. The China office is now financially self-supporting, and the Middle East office is running a positive net budget with multiple events each year. The success of these offices in addressing the needs of our membership and our profession has led us to look at Houston. Ironically, in Houston, where the SEG was founded and which continues to serve as a technical and organizational center for many oil companies and geophysical service companies, there is only a minimal permanent SEG presence.

Where in the World Did You Get That Rash?

1. Panteha Eshtiaghi, HBSc* 2. Miriam Weinstein, MD, FRCPC† 1. *Faculty of Medicine, University of British Columbia, Vancouver, British Columbia, Canada 2. †Hospital for Sick Children, Toronto, Ontario, Canada * Abbreviations: ACD: : allergic contact dermatitis CD: : cercarial dermatitis CL: : cutaneous leishmaniasis CLM: : cutaneous larva migrans DF: : dengue fever HFMD: : hand, foot, and mouth disease HSV: : herpes simplex virus KD: : Kawasaki disease PCR: : polymerase chain reaction PR: : pityriasis rosea RT-PCR: : reverse transcriptase polymerase chain reaction The challenge to diagnose cutaneous eruptions and lesions in patients who have spent time in foreign countries is increasingly common. With the advent of increased global travel, foreign adoptions, immigration, and refugee seekers, rashes that were once relegated to the realm of the exotic and likely to show up in a tropical diseases clinic may now present to a general pediatrician. Furthermore, the pediatric traveler is at increased risk for dermatoses. (1) It behooves the practitioner to be aware of these skin findings, to be able to recognize them and distinguish them from other skin conditions. After completing this article, readers should be able to: 1. Identify and classify rashes by main morphologic patterns. 2. Develop a broad differential diagnosis and diagnostic approach for a rash in a returned pediatric traveler based on initial morphology, history, epidemiology, and other clinical features. 3. Consider both infectious and noninfectious causes of skin disorders presenting in a patient with a travel history. 4. Outline the basic investigations and principles of management for travel-acquired and non–travel-acquired dermatologic illnesses. 5. Discuss …

Ebrey, Patricia Buckley and Huang, Shih-shan Susan: Visual and Material Cultures in Middle Period China

Ebrey, Patricia Buckley and Huang, Shih-shan Susan: Visual and Material Cultures in Middle Period China

Between stranded assets and green transformation: Fossil-fuel-producing developing countries towards 2055

Climate-related asset stranding refers to the depreciation of assets – such as resource reserves, infrastructure, or industries – resulting from the unanticipated changes, such as the tightening of climate policies. Although developing countries – especially fossil-fuel exporters – may be most concerned by this issue, its analysis in development (economics) has so far been limited. We aim at enhancing the understanding of stranded assets by investigating its relevance in the resource sectors of three case study regions –the Middle East, China, and Latin America. For this, we analyse the regional dimensions of four interdisciplinary global energy scenarios. Specifically, we extract results from a numerical energy model (energy production, energy consumption, electricity generation) for the three regions and introduce a novel index for stranded assets. The index identifies which fossil fuel sector in each region is most prone to asset stranding and should receive the most attention from national and international policymakers. We find that considerable uncertainty exists for the Chinese coal sector as well as the Middle Eastern and Latin American crude oil sectors. We finally put our results into perspective by discussing aspects that are closely related to stranded assets for resource-rich economies such as the uncertainty in global energy and climate policy, the resource curse and diversification, economic resilience, and unequal burden-sharing of climate policy efforts between industrialised economies and latecomers. We conclude that China is more likely to engage in a green transformation than the Latin Americas or, still less, the Middle East.

A Review On Corona Virus

Most varieties of viruses generally affect the higher respiratory tract of birds and animals and additionally to humans; coronavirus is certainly one of them. From time to time this coronavirus is spread to human beings from animals. Coronavirus is the reason behind the more severe outbreaks. Recently or current outbreaks of coronavirus is epi-contorted COVID-19. An acute respiratory disorder has been introduced; due to a unique coronavirus know as SARS-Cov-2, also known as 2019-nCoV. This COVID-19 (also as coronavirus sickness 2019) has unfolded in the Wuhan of Middle China and obtains the attention of global. In the 21st century, after the SARS-CoV (severe acute respiratory syndrome coronavirus) in 2002 and MERS-CoV (Middle East respiratory syndrome coronavirus) in 2012, SARS-CoV 2 or COVID-19 is the one of the third creation which causes high scale epidemic coronavirus in the human population. These viruses cause usually more common cold than others. Health practitioners link them with the not unusual cold, pneumonia, fever, bloodless and additionally affect the gastrointestinal tract of a human. Meanwhile, several impartial studies agencies have recognized that SARS-CoV-2 belongs to ß-coronavirus, with the tremendously equal genome to bat coronavirus, pointing to bat as the natural host. The novel coronavirus occupies the same receptor, angiotensin-changing enzyme 2 (ACE-2) as that for SARS-CoV, and in particular spreads through the respiratory tract. Importantly, studies give proof that shows the transmission of this virus to human-to-human, along with many exported instances across the world. The geriatric population and people who are under some diseases are at risk of infection of this virus and susceptible to serious outcomes, which can be associated with acute breathing distress syndrome (ADRS).

Equity in health-care financing in China during the progression toward universal health coverage

Financing equity has become a major policy goal in China's progression toward universal health coverage since the beginning of the 21st century. In this study, we examine the equity characteristics of health-care financing in a province in the middle of China, comparing the equity performance between urban and rural areas at two different points in time. Progressivity and the corresponding Kakwani index were used to assess four health-care financing sources: indirect and direct taxes, public health insurance, and out-of-pocket payments. Two rounds of surveys were conducted in 2008 (5650 individuals in 1800 households) and 2013 (11,250 individuals in 3598 households). Household socioeconomic status, health-care payments, and utilization information were recorded during household interviews. Total health-care financing was near proportional in 2008 and slightly progressive in 2013 in urban areas, whilst it was marginally progressive in both 2008 and 2013 in rural areas. The health-care financing system was more equitable in 2013 than in 2008. Overall, the performance of China's health-care financing has improved over the period 2008–2013. Using flat-rate contributions to fund health care is not equitable to the poor. Key measures to achieve equitable health-care financing distribution include improvements in the benefit packages offered by health-insurance schemes and provision of essential health services.

Modeling and optimization of technological process and means of mechanization of grain production for middle China based on Belarusian technology

One of the main problems in grain production in China is the high level of unit costs (high cost price). The main reason is the low level of mechanization. Development of efficient technologies and means of mechanization is a promising area allowing to decrease the level of unit costs at a given labor efficiency and maintaining the achieved yield. Grain production is a complex system associated with a large amount of information: agro-technological (crop variety, crop yield, physical-and-mechanical parameters of land plots, terms of operations, permissible speed range for specific operations, etc.), technical-and-economic (power and traction parameters, throughput, working width, operating weight, hopper volume , cost). At present, efficient methods for studying complex systems have appeared as a result of development and widespread implementation of computer mathematics systems, which allow us to study mechanization technologies and tools using multi-factor modeling and multi-criteria optimization. The paper presents a multi-factor mathematical model, peculiar for the fact that the three groups of simultaneously varying factors are taken for the first time engine power, MTA speed, timing of the main energy-intensive operations – plowing, harvesting, and as conflicting optimization parameters unit cost level, coefficient of crop losses, labor efficiency, which allowed a comprehensive study of the grain production process in any natural-production conditions. A technological process has been developed (units speed and timing of the main operations (plowing, harvesting) and the corresponding range of machines and equipment, ensuring minimum level of unit costs at a given labor efficiency and maintaining the achieved crop yield, taking into account the specifics of the Middle China (2 crops per year).

Regional Disparity of Medical Resources and Its Effect on Mortality Rates in China.

Objectives: The purpose of this study was two-fold. First, to empirically study the effects that medical resources (i.e., hospital, doctors, beds) have on the mortality rate in China. Second, to divide China into east, middle, and west regions, and empirically study the regional disparity of medical resources and its effect on mortality rates in China.Methodology and Data: This study utilized a panel data regression model to explore the effect medical resources have on the age-standardized mortality rate in China. The data came from the 2003–2017 China Statistical Yearbook compiled by the National Bureau of Statistics of China.Results: Nationwide, hospitals, doctors, and beds had a significant negative correlation with the mortality rate. In the western region, hospitals, beds, and doctors had a significant negative correlation with the mortality rate. In China's middle and eastern regions, hospitals, beds, and doctors had no significant effect on the mortality rate. In China, increased hospitals, doctors, and beds significantly reduced the mortality rate. The distribution of medical resources in eastern, middle, and western China was unequal. More hospitals, beds, and doctors in the less developed western regions can more effectively alleviate the local mortality rate. In the middle and east regions, hospitals, beds, and doctors had no significant impact on the local mortality rate.Conclusion: First, China's overall medical resources are still inadequate and improving medical resources throughout the country could reduce the mortality rate. Second, due to the imbalanced distribution of medical resources in China, the Chinese government should implement more supportive policies for medical resources in the western region. At the same time, we should also actively develop the western region by improving local per capita GDP and reducing unemployment, so as to fundamentally reduce the local mortality rate.

Spatiotemporal variability of standardized precipitation evapotranspiration index in mainland China over 1961–2016

AbstractA good understanding of spatiotemporal characteristics of historical droughts is important for managing and tackling drought hazards. This paper aims to investigate spatiotemporal variations of drought in mainland China over 1961–2016 based on the standardized precipitation evapotranspiration index (SPEI) at the 1‐ and 12‐month timescales. The trend significance and magnitude of 12‐month SPEI were analysed using the modified Mann–Kendall (MMK) method and Sen's slope values. The empirical orthogonal function (EOF) and ensemble empirical mode decomposition (EEMD) were applied to analyse the spatial patterns and periods in 1‐month SPEI series. The results showed that the temporal fluctuations of SPEI were weaker as the timescale increased. The droughts in 1960s were the severest than in other decades. The sites with SPEI < −5 (denoting the extreme droughts) mainly located in the northwestern and southwestern China. An overall wetter trend was detected in most regions of China, except the belt from northeastern to middle and southwestern China. The 1‐month SPEI had shorter than 1.20‐year of mean periods for the seven sub‐regions and China, while had 0.22–2.95 years of mean periods at different sites. Residuals (decomposed from 1‐month SPEI) showed increasing trends in most of the sub‐regions except sub‐region 3. In northern and northwestern China, longer periods of SPEI were detected. The highest values of EOF1 and EOF2 illustrated the eastern and northeastern China were drought‐sensitive areas. From the correlations between 1‐month SPEI and the atmospheric circulations, the AO was the main physical factor that influenced drought occurrence in mainland China. The identified spatiotemporal characteristics of SPEI could offer references for drought prevention and management in China.

Importance of Bias Correction in Data Assimilation of Multiple Observations Over Eastern China Using WRF‐Chem/DART

AbstractThree types of observations, aerosol optical depth from the Moderate Resolution Imaging Spectroradiometer, surface particulate matter with diameters less than 2.5 (PM2.5) and 10 μm (PM10), and aerosol extinction coefficient (AEXT) profiles from ground‐based lidars, were separately and simultaneously assimilated using the Weather Research and Forecasting Model with the Chemistry/Data Assimilation Research Testbed (WRF‐Chem/DART). Two cases in June and November 2018 were selected over middle and eastern China. Experiments assimilating single‐type and multiple observations were evaluated by cross validating their analysis and forecast against the three observation types. Compared to the experiment without data assimilation (DA), DA of single‐type observations is always closer to the type of observations assimilated. However, DA of aerosol optical depth or AEXT sometimes significantly degraded the error performance for PM2.5. This problem is caused by the inconsistency of bias tendencies when modeling aerosol optical properties and surface aerosol mass. It is found that WRF‐Chem tends to predict dryer air within the boundary layer over eastern China, which may have played a role in the underestimation of AEXT even when PM2.5 was overestimated. After applying a simple bias correction (BC), the problem was alleviated. DA of multiple observations with BC gives the best overall error performance when validated against all types of observations and even performs better than any DA of single‐type observations experiments in reproducing AEXT profiles. The results illustrate that BC is important in DA of multiple observations and that the simultaneous DA of aerosol observations with different vertical information can work synergistically to improve aerosol forecasts.

Discrete Element Modeling and Verification of an Outer Groove Wheel Fertilizer Applicator with Helical Teeth

Highlights An outer groove wheel fertilizer applicator with helical teeth was designed. The helical teeth made the fertilizer mass and kinetic energy more stable. The fertilizer mass rate was sensitive to the working length and rotational speed. Abstract. The fertilizer applicator plays an important role in making fertilization efficient, and a fertilizer applicator called the outer groove wheel fertilizer applicator (OGWFA) is widely used in the middle of China. An OGWFA with traditional straight teeth has a pulsation phenomenon and problems with breaks in application. To improve the fertilization performance, an OGWFA was designed with helical teeth in a staggered arrangement. The helical angle is an important parameter for the outer groove wheel (OGW), and 47.5° was considered a reasonable helical angle for this OGWFA according to fertilization performance simulated using discrete element modeling (DEM). The performances of OGWFAs with 47.5° helical teeth and with straight teeth were experimentally compared and analyzed by DEM. The OGWFA with helical teeth obtained lower coefficients of variation (CV) and break rates and smaller width of the fertilizer distribution. The simulation showed that the helical teeth made the fertilizer discharge more stable. The effects of working length, rotational speed, and coefficient of static friction between fertilizer particles on OGWFA performance were also simulated. Keywords: DEM, Discrete element method, Fertilizer applicator, Outer groove wheel.

Does structural deceleration happen in China? Evidence from the effect of industrial structure on economic growth quality

China's economy has experienced high-speed development, followed by structural deceleration according to law of development. Does it happen in China? This is the problem focused on in this paper. We explore the appearance for structural deceleration in China through the relation between industrial structure and economic growth quality. The green total factor productivity is selected as the measurement assessing the economic growth quality. We use the Global Malmquist-Luenberger index to measure economic growth quality of China for 30 Chinese provinces over the period of 1998 to 2015. First, the panel regression model is used to show a positive effect of industrial structure on economic growth quality with full sample as well as subsample in the east of China. Negative effects of industrial structure are shown in the middle and west of China. Then the structural deceleration is captured by panel quantile regression model. We claim that structural deceleration indeed happens in China through a decreased contribution of industrial structure to the economic growth quality at different quantiles. However, industrial structure in the east of China still plays a positive role in accelerating the economic growth quality, while its negative effect is anabatic in the middle of China. Finally, we investigate the influencing mechanism of industrial structure on economic growth quality represented by the moderating effects of human capital, innovation capacity and economic development level. All of them show positive moderating effects. The human capital and innovation capacity show heterogeneous at different levels of economic growth quality, contrary to economic development level. Some policy implications are derived according to the results achieved in this the pap

PM2.5-Related Health Economic Benefits Evaluation Based on Air Improvement Action Plan in Wuhan City, Middle China.

On the basis of PM2.5 data of the national air quality monitoring sites, local population data, and baseline all-cause mortality rate, PM2.5-related health economic benefits of the Air Improvement Action Plan implemented in Wuhan in 2013–2017 were investigated using health-impact and valuation functions. Annual avoided premature deaths driven by the average concentration of PM2.5 decrease were evaluated, and the economic benefits were computed by using the value of statistical life (VSL) method. Results showed that the number of avoided premature deaths in Wuhan are 21,384 (95% confidence interval (CI): 15,004 to 27,255) during 2013–2017, due to the implementation of the Air Improvement Action Plan. According to the VSL method, the obtained economic benefits of Huangpi, Wuchang, Hongshan, Xinzhou, Jiang’an, Hanyang, Jiangxia, Qiaokou, Jianghan, Qingshan, Caidian, Dongxihu, and Hannan District were 8.55, 8.19, 8.04, 7.39, 5.78, 4.84, 4.37, 4.04, 3.90, 3.30, 2.87, 2.42, and 0.66 billion RMB (1 RMB = 0.1417 USD On 14 October 2019), respectively. These economic benefits added up to 64.35 billion RMB (95% CI: 45.15 to 82.02 billion RMB), accounting for 4.80% (95% CI: 3.37% to 6.12%) of the total GDP of Wuhan in 2017. Therefore, in the process of formulating a regional air quality improvement scheme, apart from establishing hierarchical emission-reduction standards and policies, policy makers should give integrated consideration to the relationship between regional economic development, environmental protection and residents’ health benefits. Furthermore, for improving air quality, air quality compensation mechanisms can be established on the basis of the status quo and trends of air quality, population distribution, and economic development factors.

The development of transfer passenger volumes and shares at airport and world region levels

Many air travelers have to change planes. Knowledge on transfer passengers and shares at airport to worldwide levels can be useful industry, policy and research questions. However, as such data is usually not disclosed publically, the structure of transfer volumes and shares has not yet been studied in greater detail. This leaves a research (data) gap which this paper intends to close to some extent. More precisely, we aim at assessing: How total transfer passenger volumes have developed, at worldwide and world region levels; how these relate to the volumes of directly flying passengers; the leading transfer airports in absolute and relative sense; and how the latter have changed over time. We present a methodology to calculate transfer passengers from segment passenger split data provided in the “leg flow” statistics module of a global air transport statistical database which consolidates passenger booking data and estimates from various sources. Departing passenger numbers at the airport level are split into local, beyond, behind and bridge passengers, of which only the latter two count as transfer passengers. The transfer share of an airport is then calculated as the sum of this airport’s behind and bridge passengers divided by all departing passengers. Applying this methodology, we estimate transfer passenger numbers and shares for all airports and world regions for the period 2002-2018. The results indicate a declining importance of transfer passengers at the global level; rising transfer volumes and shares in the Middle East region and China, driven by the growth of emerging ChiBoGu (China, Bosporus, Gulf) carriers; decreasing transfer passenger numbers in the U.S., probably due to airline consolidation and hub downsizing activities in the 00s. Finally, key hubs in cities with less touristic appeal like, e.g. Atlanta or Doha, seem to achieve higher transfer shares than gateway hubs in high-profile destinations like Dubai or New York.

Механизмы углубления торгово-экономического и инвестиционного взаимодействия между странами ШОС и ЕАЭС (на примере Узбекистана)

The article discusses the issues of interaction between Uzbekistan and the states that are members of the Shanghai Cooperation Organization, the Eurasian Economic Union, on trade, economic and investment issues. The authors hope that Uzbekistan’s acquisition of the EAEU observer status will allow establishing a dialogue with partners and getting acquainted with the mechanisms of the EAEU functioning, using the developed transport and communication system of the Eurasian economic Union, which provides the shortest routes between Europe and Asia, access to markets and sea routes of the Middle East, China, Russia and Europe. The authors also draw attention to the obstacles that states have to deal with in the process of interaction: inconsistencies between the legal framework and technical standards of different countries.

模拟穿透雨减少对锐齿栎(Quercus aliena var. acuteserrata)树干液流密度的影响

PDF HTML阅读 XML下载 导出引用 引用提醒 模拟穿透雨减少对锐齿栎(Quercus aliena var. acuteserrata)树干液流密度的影响 DOI: 10.5846/stxb201903060423 作者: 作者单位: 作者简介: 通讯作者: 中图分类号: 基金项目: 国际竹藤中心基本科研业务费专项基金项目（1632018002，1632018004，1632017016）；国家重点研发计划（2018YFC0507301） Effects of manipulated throughfall reduction on sap flux density of Quercus aliena var. acuteserrata Author: Affiliation: Fund Project: International Bamboo and Rattan Center"s special funds for basic research and operation fees;National Key R&D Program 摘要 | 图/表 | 访问统计 | 参考文献 | 相似文献 | 引证文献 | 资源附件 | 文章评论 摘要:降水格局变化是全球气候变化的重要特征之一，未来气候变化下，较为频繁和严峻的干旱将威胁地球中纬度部分地区的森林，但森林植被如何响应季节性干旱胁迫及其机制尚不清楚。北亚热带-暖温带过渡区分布着以锐齿栎（Quercus aliena var. acuteserrata）为优势树种的落叶阔叶林，研究其水分蒸腾代谢过程对干旱的响应是评估气候变化对过渡区天然落叶阔叶林生态系统水碳影响的关键科学问题。在典型的锐齿栎天然林中通过开展模拟穿透雨减少大型野外实验，采用Granier热扩散式探针技术监测锐齿栎树干液流密度的动态变化，研究了不同径级锐齿栎树干液流密度对模拟干旱的响应规律。结果表明：（1）穿透雨减少对树干液流密度的影响呈现季节变异。在7月份，林内穿透雨减少显著降低了锐齿栎的树干液流密度，但生长季后期的10月份林内穿透雨减少反而使锐齿栎树干液流密度显著升高。（2）不同径级的锐齿栎树干液流密度在生长季内对干旱有不同的响应，特别是小径级的树干液流密度与其他径级有较多的不同。小径级的锐齿栎树干液流密度在5、7月份表现为减雨样地显著小于对照样地，在9、10月份则表现为减雨样地显著大于对照样地。中径级的锐齿栎树干液流密度在5、10月份表现为减雨样地显著大于对照样地，在7月份则表现为减雨样地极显著小于对照样地。大径级的锐齿栎树干液流密度在6、7月份表现为减雨样地显著小于对照样地，在10月份则表现为减雨样地显著大于对照样地。 Abstract:The change in precipitation pattern is one of the characteristics of global climate change. Some regions at mid-latitude might experience more frequent and severe drought. However, it is unclear how the precipitation change will affect the forest vegetation in those regions. Amongst, Quercus aliena var. acuteserrata is the dominant canopy tree species of deciduous broad-leaved forests in the warm temperate zone of middle China. Understanding the evapotranspiration responses of Q. aliena to drought induced by climate change is crucial to elucidate carbon-water coupling process. In order to explore the warm-temperate deciduous broad-leaved forest response to precipitation change, a manipulated throughfall reduction experiment was conducted in Baotianman National Nature Reserve since 2013. The Granier thermal diffusion probe (TDP) was used to measure the dynamic change of sap flux density of Q. aliena. The results showed that the throughfall reduction had significant effects on the sap flux density (Js) during the growing season. Firstly, the throughfall reduction significantly reduced the sap flux density of Q. aliena in July. However, in the late growing season (October), the throughfall reduction increased the sap flux density of Q. aliena significantly. Therefore, the sap flux density of Q. aliena differently responded to the throughfall reduction among months during the growing season. Secondly, the sap flux density of Q. aliena of different tree sizes showed different responses to drought during the growing season, especially the small trees (diameter at breast height, DBH≤21 cm) was different from that of medium (21 cm 参考文献 相似文献 引证文献