The sown area of winter wheat in the Huang-Huai-Hai（HHH） Plain accounts for over 65% of the total sown area of winter wheat in China. Thus, it is important to monitor the winter wheat growth condition and reveal the...The sown area of winter wheat in the Huang-Huai-Hai（HHH） Plain accounts for over 65% of the total sown area of winter wheat in China. Thus, it is important to monitor the winter wheat growth condition and reveal the main factors that influence its dynamics. This study assessed the winter wheat growth condition based on remote sensing data, and investigated the correlations between different grades of winter wheat growth and major meteorological factors corresponding. First, winter wheat growth condition from sowing until maturity stage during 2011–2012 were assessed based on moderate-resolution imaging spectroradiometer（MODIS） normalized difference vegetation index（NDVI） time-series dataset. Next, correlation analysis and geographical information system（GIS） spatial analysis methods were used to analyze the lag correlations between different grades of winter wheat growth in each phenophase and the meteorological factors that corresponded to the phenophases. The results showed that the winter wheat growth conditions varied over time and space in the study area. Irrespective of the grades of winter wheat growth, the correlation coefficients between the winter wheat growth condition and the cumulative precipitation were higher than zero lag（synchronous precipitation） and one lag（pre-phenophase precipitation） based on the average values of seven phenophases. This showed that the cumulative precipitation during the entire growing season had a greater effect on winter wheat growth than the synchronous precipitation and the pre-phenophase precipitation. The effects of temperature on winter wheat growth varied according to different grades of winter wheat growth based on the average values of seven phenophases. Winter wheat with a better-than-average growth condition had a stronger correlation with synchronous temperature, winter wheat with a normal growth condition had a stronger correlation with the cumulative temperature, and winter wheat with a worse-than-average growth condition had a stronger correlation with the pre-phenophase temperature. This study may facilitate a better understanding of the quantitative correlations between different grades of crop growth and meteorological factors, and the adjustment of field management measures to ensure a high crop yield.展开更多
目的:分析龋病患儿唾液离子浓度、链球菌、双歧杆菌变化与病情的关联性。方法:选择2022年5月—2023年4月收治的80例3~6岁龋病患儿为试验组,根据龋失补指数(DMFT)分为轻度组(DMFT≤15%,n=35)和重度组(DMFT>15%,n=45);另选择进行健康...目的:分析龋病患儿唾液离子浓度、链球菌、双歧杆菌变化与病情的关联性。方法:选择2022年5月—2023年4月收治的80例3~6岁龋病患儿为试验组,根据龋失补指数(DMFT)分为轻度组(DMFT≤15%,n=35)和重度组(DMFT>15%,n=45);另选择进行健康检查的80例3~6岁无龋病患儿为对照组。采用甲基麝香酚蓝检测唾液中钙离子浓度,采用实时定量PCR技术检测链球菌、双歧杆菌水平,采用Pearson分析DMFT与唾液钙离子浓度、链球菌、双歧杆菌的相关性,并采用受试者工作特征曲线(receiver operating characteristic curve,ROC)评估唾液钙离子浓度、链球菌、双歧杆菌对龋病患儿病情严重程度的诊断价值,计算曲线下面积(area under the curve,AUC)。采用SPSS 22.0软件包对数据进行统计学分析。结果:试验组唾液钙离子浓度、变形链球菌、远缘链球菌和双歧杆菌水平显著高于对照组(P<0.05);重度组显著高于轻度组(P<0.05);DMFT与唾液钙离子浓度、链球菌、双歧杆菌呈正相关(P<0.05)。根据DMFT制作ROC曲线,唾液钙离子浓度、变形链球菌、远缘链球菌和双歧杆菌对评估龋病患儿病情严重程度的AUC分别为0.760、0.658、0.718和0.705。结论:唾液离子浓度、变形链球菌、远缘链球菌和双歧杆菌水平增加与患儿龋病有关,与龋病病情程度呈正相关,对评估病情严重程度有一定价值。展开更多
基金financially supported by the National Nonprofit Institute Research Grant of Chinese Academy of Agricultural Sciences(IARRP-2015-8)the European Union seventh framework"MODEXTREME"(modelling vegetation response to extreme events)programme(613817)
文摘The sown area of winter wheat in the Huang-Huai-Hai（HHH） Plain accounts for over 65% of the total sown area of winter wheat in China. Thus, it is important to monitor the winter wheat growth condition and reveal the main factors that influence its dynamics. This study assessed the winter wheat growth condition based on remote sensing data, and investigated the correlations between different grades of winter wheat growth and major meteorological factors corresponding. First, winter wheat growth condition from sowing until maturity stage during 2011–2012 were assessed based on moderate-resolution imaging spectroradiometer（MODIS） normalized difference vegetation index（NDVI） time-series dataset. Next, correlation analysis and geographical information system（GIS） spatial analysis methods were used to analyze the lag correlations between different grades of winter wheat growth in each phenophase and the meteorological factors that corresponded to the phenophases. The results showed that the winter wheat growth conditions varied over time and space in the study area. Irrespective of the grades of winter wheat growth, the correlation coefficients between the winter wheat growth condition and the cumulative precipitation were higher than zero lag（synchronous precipitation） and one lag（pre-phenophase precipitation） based on the average values of seven phenophases. This showed that the cumulative precipitation during the entire growing season had a greater effect on winter wheat growth than the synchronous precipitation and the pre-phenophase precipitation. The effects of temperature on winter wheat growth varied according to different grades of winter wheat growth based on the average values of seven phenophases. Winter wheat with a better-than-average growth condition had a stronger correlation with synchronous temperature, winter wheat with a normal growth condition had a stronger correlation with the cumulative temperature, and winter wheat with a worse-than-average growth condition had a stronger correlation with the pre-phenophase temperature. This study may facilitate a better understanding of the quantitative correlations between different grades of crop growth and meteorological factors, and the adjustment of field management measures to ensure a high crop yield.
文摘目的:分析龋病患儿唾液离子浓度、链球菌、双歧杆菌变化与病情的关联性。方法:选择2022年5月—2023年4月收治的80例3~6岁龋病患儿为试验组,根据龋失补指数(DMFT)分为轻度组(DMFT≤15%,n=35)和重度组(DMFT>15%,n=45);另选择进行健康检查的80例3~6岁无龋病患儿为对照组。采用甲基麝香酚蓝检测唾液中钙离子浓度,采用实时定量PCR技术检测链球菌、双歧杆菌水平,采用Pearson分析DMFT与唾液钙离子浓度、链球菌、双歧杆菌的相关性,并采用受试者工作特征曲线(receiver operating characteristic curve,ROC)评估唾液钙离子浓度、链球菌、双歧杆菌对龋病患儿病情严重程度的诊断价值,计算曲线下面积(area under the curve,AUC)。采用SPSS 22.0软件包对数据进行统计学分析。结果:试验组唾液钙离子浓度、变形链球菌、远缘链球菌和双歧杆菌水平显著高于对照组(P<0.05);重度组显著高于轻度组(P<0.05);DMFT与唾液钙离子浓度、链球菌、双歧杆菌呈正相关(P<0.05)。根据DMFT制作ROC曲线,唾液钙离子浓度、变形链球菌、远缘链球菌和双歧杆菌对评估龋病患儿病情严重程度的AUC分别为0.760、0.658、0.718和0.705。结论:唾液离子浓度、变形链球菌、远缘链球菌和双歧杆菌水平增加与患儿龋病有关,与龋病病情程度呈正相关,对评估病情严重程度有一定价值。
