为了探究全球气候变化背景下淡水和沿岸土壤盐化对龟类生存造成的威胁和挑战,了解盐度变化对龟类早期生活史的影响,以红耳龟(Trachemys scripta elegans)为研究对象,设置淡水对照组(CK)、0.5盐度组(S_(0.5))、2.5盐度组(S_(2.5))和5盐度...为了探究全球气候变化背景下淡水和沿岸土壤盐化对龟类生存造成的威胁和挑战,了解盐度变化对龟类早期生活史的影响,以红耳龟(Trachemys scripta elegans)为研究对象,设置淡水对照组(CK)、0.5盐度组(S_(0.5))、2.5盐度组(S_(2.5))和5盐度组(S_(5)),分析盐度变化对其受精卵孵化、稚龟表型及行为特征的影响。结果显示,随着基质中盐度的升高,CK、S_(0.5)、S_(2.5)、S_(5)组红耳龟稚龟孵化率(80.00%、83.33%、60.00%、43.33%)基本呈下降趋势,孵化时间(51、52、54、53 d)略有增加,稚龟在30 d时的存活率(95.83%、95.83%、94.44%、81.80%)逐渐下降,并导致孵出个体的畸形率增加,且以龟甲畸形占比最高(S_(5)组为100%)。高盐度(S5)基质中孵出的稚龟,其体重极显著低于对照组(P<0.01),背、腹甲的长度和宽度也显著低于对照组(P<0.05)。稚龟的运动速度及耐力受到显著抑制,翻身速度变慢,摄食能力显著降低(P<0.05)。研究表明,红耳龟作为一种耐受性较强的淡水龟代表,上升的环境盐度可直接影响其受精卵的孵化率、初生幼体的存活率及适合度,对红耳龟卵孵化和稚龟行为具有显著的负面效应。由此推断淡水咸化对其他淡水龟类的影响可能更为严重。展开更多
The response of vegetation productivity to precipitation is becoming a worldwide concern.Most reports on responses of vegetation to precipitation trends are based on the growth season.In the soil freeze/thaw process,t...The response of vegetation productivity to precipitation is becoming a worldwide concern.Most reports on responses of vegetation to precipitation trends are based on the growth season.In the soil freeze/thaw process,the soil water phase and heat transport change can affect root growth,especially during the thawing process in early spring.A field experiment with increased precipitation(control,increased 25%and increased 50%)was conducted to measure the effects of soil water in early spring on above-and below-ground productivity in an alpine steppe over two growing seasons from June 2017 to September 2018.The increased 50%treatment significantly increased the soil moisture at the 10 cm depth,there was no difference in soil moisture between the increased 25%treatment and the control in the growing season,which was not consistent in the freeze/thaw process.Increased soil moisture during the non-growing season retarded root growth.Increased precipitation in the freezing-thawing period can partially offset the difference between the control and increased precipitation plots in both above-and below-ground biomass.展开更多
Objective:To identify the prevalence and influencing factors of allergic rhinitis among middle school students in Haikou,and to provide reference for the prevention and treatment of allergic rhinitis among middle scho...Objective:To identify the prevalence and influencing factors of allergic rhinitis among middle school students in Haikou,and to provide reference for the prevention and treatment of allergic rhinitis among middle school students in Haikou.Methods:The stratified cluster sampling method was adopted to randomly select the middle school students(aged 12-18)from 8 ordinary or vocational middle schools in Xiuying District,Longhua District,Meilan District and Qiongshan District of Haikou as the survey subjects.The self-made questionnaire was used to conduct the survey from April to May in 2022.Results:A total of 2169 valid questionnaires were collected,the effective rate was 86.6%(2169/2479),814(37.5%)male students and 1355(62.5%)female students.The prevalence rate of allergic rhinitis reported by middle school students in Haikou was 39.8%(863/2169),including 599 cases of intermittent allergic rhinitis(69.4%)and 264 cases of persistent allergic rhinitis(30.6%).The January,February,November and December were the periods of high incidence of symptoms each year.The results of multivariate logistic regression analysis showed that:using antibiotics 5 times a year[OR=2.07,95%CI(1.24-3.45),P=0.005],using antibiotics 3-4 times a year[OR=1.77,95%CI(1.23-2.55),P=0.002],family history of allergic rhinitis[OR=3.84,95%CI(2.67-5.54),P<0.001],history of sinusitis[OR=7.77,95%CI(3.22-18.76),P<0.001],damp living environment[OR=2.87,95%CI(2.00-4.13),P<0.001],history of asthma[OR=8.69,95%CI(1.93-39.12),P=0.005],urban residents[OR=1.68,95%CI(1.35-2.09),P<0.001],frequent exposure to dust[OR=1.59,95%CI(1.20-2.12),P=0.001],male[OR=1.35,95%CI(1.10-1.66),P=0.005],furry pet[OR=1.39,95%CI(1.10-1.75),P=0.006],daily sleep time<8 hours[OR=1.30,95%CI(1.07-1.58),P=0.009]were risk factors for allergic rhinitis.Conclusion:The prevalence of allergic rhinitis among middle school students in Haikou was higher than reported in most areas of China.Male,urban residents,antibiotic use,sleeping less than 8 hours a day,feeding furry pets,living in humid environment,frequent exposure to dust,family history of allergic rhinitis,history of sinusitis and history of asthma were risk factors for allergic rhinitis.Family history of allergic rhinitis,sinusitis and asthma were the most significant factors.展开更多
文摘为了探究全球气候变化背景下淡水和沿岸土壤盐化对龟类生存造成的威胁和挑战,了解盐度变化对龟类早期生活史的影响,以红耳龟(Trachemys scripta elegans)为研究对象,设置淡水对照组(CK)、0.5盐度组(S_(0.5))、2.5盐度组(S_(2.5))和5盐度组(S_(5)),分析盐度变化对其受精卵孵化、稚龟表型及行为特征的影响。结果显示,随着基质中盐度的升高,CK、S_(0.5)、S_(2.5)、S_(5)组红耳龟稚龟孵化率(80.00%、83.33%、60.00%、43.33%)基本呈下降趋势,孵化时间(51、52、54、53 d)略有增加,稚龟在30 d时的存活率(95.83%、95.83%、94.44%、81.80%)逐渐下降,并导致孵出个体的畸形率增加,且以龟甲畸形占比最高(S_(5)组为100%)。高盐度(S5)基质中孵出的稚龟,其体重极显著低于对照组(P<0.01),背、腹甲的长度和宽度也显著低于对照组(P<0.05)。稚龟的运动速度及耐力受到显著抑制,翻身速度变慢,摄食能力显著降低(P<0.05)。研究表明,红耳龟作为一种耐受性较强的淡水龟代表,上升的环境盐度可直接影响其受精卵的孵化率、初生幼体的存活率及适合度,对红耳龟卵孵化和稚龟行为具有显著的负面效应。由此推断淡水咸化对其他淡水龟类的影响可能更为严重。
基金funded by the Second Tibetan Plateau Scientific Explorationthe Strategic Priority Research Program of Chinese Academy of Sciences+1 种基金the National Natural Science Foundation,grant number 2019QZKK0404,XDA20020401,41977284by the Doctoral Science Foundation of Henan Polytechnic University(B2019-019)。
文摘The response of vegetation productivity to precipitation is becoming a worldwide concern.Most reports on responses of vegetation to precipitation trends are based on the growth season.In the soil freeze/thaw process,the soil water phase and heat transport change can affect root growth,especially during the thawing process in early spring.A field experiment with increased precipitation(control,increased 25%and increased 50%)was conducted to measure the effects of soil water in early spring on above-and below-ground productivity in an alpine steppe over two growing seasons from June 2017 to September 2018.The increased 50%treatment significantly increased the soil moisture at the 10 cm depth,there was no difference in soil moisture between the increased 25%treatment and the control in the growing season,which was not consistent in the freeze/thaw process.Increased soil moisture during the non-growing season retarded root growth.Increased precipitation in the freezing-thawing period can partially offset the difference between the control and increased precipitation plots in both above-and below-ground biomass.
基金National Natural Science Foundation of China(82160210)Hainan Provincial Natural Science Foundation of China(821MS131)Hainan Medical and Health Research Program(22A200028)。
文摘Objective:To identify the prevalence and influencing factors of allergic rhinitis among middle school students in Haikou,and to provide reference for the prevention and treatment of allergic rhinitis among middle school students in Haikou.Methods:The stratified cluster sampling method was adopted to randomly select the middle school students(aged 12-18)from 8 ordinary or vocational middle schools in Xiuying District,Longhua District,Meilan District and Qiongshan District of Haikou as the survey subjects.The self-made questionnaire was used to conduct the survey from April to May in 2022.Results:A total of 2169 valid questionnaires were collected,the effective rate was 86.6%(2169/2479),814(37.5%)male students and 1355(62.5%)female students.The prevalence rate of allergic rhinitis reported by middle school students in Haikou was 39.8%(863/2169),including 599 cases of intermittent allergic rhinitis(69.4%)and 264 cases of persistent allergic rhinitis(30.6%).The January,February,November and December were the periods of high incidence of symptoms each year.The results of multivariate logistic regression analysis showed that:using antibiotics 5 times a year[OR=2.07,95%CI(1.24-3.45),P=0.005],using antibiotics 3-4 times a year[OR=1.77,95%CI(1.23-2.55),P=0.002],family history of allergic rhinitis[OR=3.84,95%CI(2.67-5.54),P<0.001],history of sinusitis[OR=7.77,95%CI(3.22-18.76),P<0.001],damp living environment[OR=2.87,95%CI(2.00-4.13),P<0.001],history of asthma[OR=8.69,95%CI(1.93-39.12),P=0.005],urban residents[OR=1.68,95%CI(1.35-2.09),P<0.001],frequent exposure to dust[OR=1.59,95%CI(1.20-2.12),P=0.001],male[OR=1.35,95%CI(1.10-1.66),P=0.005],furry pet[OR=1.39,95%CI(1.10-1.75),P=0.006],daily sleep time<8 hours[OR=1.30,95%CI(1.07-1.58),P=0.009]were risk factors for allergic rhinitis.Conclusion:The prevalence of allergic rhinitis among middle school students in Haikou was higher than reported in most areas of China.Male,urban residents,antibiotic use,sleeping less than 8 hours a day,feeding furry pets,living in humid environment,frequent exposure to dust,family history of allergic rhinitis,history of sinusitis and history of asthma were risk factors for allergic rhinitis.Family history of allergic rhinitis,sinusitis and asthma were the most significant factors.
