The sap flow velocity and the micro-meteorological environment of Sophora japonica f.pendula were measured from Aug.to Oct.2006 with sap flow gauge based on heat balance principle and auto-weather station in Ludong Un...The sap flow velocity and the micro-meteorological environment of Sophora japonica f.pendula were measured from Aug.to Oct.2006 with sap flow gauge based on heat balance principle and auto-weather station in Ludong University.The time lag effect of sap flow compared to meteorological factors was analyzed,and the regressive analysis between comprehensive affecting factor put forward by principal component analysis and sap flow was conducted.The time lag effect analysis results showed that the sap flow lag effect existed compared to total solar radiation,wind speed and photosynthetically active radiation,and the lag time was 10 min,20 min and 10 min,respectively.The time lag effect was the reason of water storage adjustment of leaves,branches and trunks.The sap flow lag time to total solar radiation and photosynthetically active radiation was shorter than wind,because solar radiation affected tree transpiration directly,and the wind affected tree transpiration through affecting boundary resistance of leaves.In the case sap flow time lag considered or not,the determination coefficients between comprehensive meteorological affecting factor and sap flow were 0.830 and 0.944,respectively,and the determination coefficient ascending 13.735% because of lag effect considered.In conclusion,the fitted precision would be improved with the time lag effect of trunk sap flow compared to micro-meteorological factors considered.展开更多
目的探讨红细胞平均体积(MCV)和红细胞分布宽度(RDW)对XN-3000血液分析仪电阻抗法(PLT-I)和核酸染色法(PLT-F)低值血小板计数的影响。方法采用Sysmex-XN3000血液分析仪对68例低值血小板患者(分四组:红细胞MCV≥70 f L、MCV<60 f L、6...目的探讨红细胞平均体积(MCV)和红细胞分布宽度(RDW)对XN-3000血液分析仪电阻抗法(PLT-I)和核酸染色法(PLT-F)低值血小板计数的影响。方法采用Sysmex-XN3000血液分析仪对68例低值血小板患者(分四组:红细胞MCV≥70 f L、MCV<60 f L、60 f LMCV<70 f L而RDW<0.2、60 f LMCV<70 f L而RDW>0.2)EDTA抗凝血分别用PLT-I法和PLT-F法进行血小板计数,同时用Beckman Coulter FC500流式细胞仪(免疫法)计数,以免疫法为参考方法进行比较分析。结果 PLT-F法、PLT-I法与免疫法的相关系数r分别为0.931、0.808,PLT-F法的相关性明显优于PLT-I法;当红细胞MCV≥70 f L、60 f L≤MCV<70 f L而RDW<0.2时,PLT-I法与免疫法比较血小板计数,差异无统计学意义(P>0.05);当红细胞MCV<60 f L、60 f L≤MCV<70 f L而RDW>0.2时,PLT-I法与免疫法比较血小板计数,差异有统计学意义(P<0.05);不同组在PLT-F法与免疫法比较差异均无统计学意义(P>0.05)。结论 PLT-F法与免疫法有良好的相关性,PLT-I法对低值血小板计数的准确性有较大影响,当MCV<60 f L或者60 f L≤MCV<70 f L而RDW>0.2时,血小板应该采用流式细胞仪或PLT-F法检测以获得更为准确的数据。展开更多
文摘The sap flow velocity and the micro-meteorological environment of Sophora japonica f.pendula were measured from Aug.to Oct.2006 with sap flow gauge based on heat balance principle and auto-weather station in Ludong University.The time lag effect of sap flow compared to meteorological factors was analyzed,and the regressive analysis between comprehensive affecting factor put forward by principal component analysis and sap flow was conducted.The time lag effect analysis results showed that the sap flow lag effect existed compared to total solar radiation,wind speed and photosynthetically active radiation,and the lag time was 10 min,20 min and 10 min,respectively.The time lag effect was the reason of water storage adjustment of leaves,branches and trunks.The sap flow lag time to total solar radiation and photosynthetically active radiation was shorter than wind,because solar radiation affected tree transpiration directly,and the wind affected tree transpiration through affecting boundary resistance of leaves.In the case sap flow time lag considered or not,the determination coefficients between comprehensive meteorological affecting factor and sap flow were 0.830 and 0.944,respectively,and the determination coefficient ascending 13.735% because of lag effect considered.In conclusion,the fitted precision would be improved with the time lag effect of trunk sap flow compared to micro-meteorological factors considered.
文摘目的探讨红细胞平均体积(MCV)和红细胞分布宽度(RDW)对XN-3000血液分析仪电阻抗法(PLT-I)和核酸染色法(PLT-F)低值血小板计数的影响。方法采用Sysmex-XN3000血液分析仪对68例低值血小板患者(分四组:红细胞MCV≥70 f L、MCV<60 f L、60 f LMCV<70 f L而RDW<0.2、60 f LMCV<70 f L而RDW>0.2)EDTA抗凝血分别用PLT-I法和PLT-F法进行血小板计数,同时用Beckman Coulter FC500流式细胞仪(免疫法)计数,以免疫法为参考方法进行比较分析。结果 PLT-F法、PLT-I法与免疫法的相关系数r分别为0.931、0.808,PLT-F法的相关性明显优于PLT-I法;当红细胞MCV≥70 f L、60 f L≤MCV<70 f L而RDW<0.2时,PLT-I法与免疫法比较血小板计数,差异无统计学意义(P>0.05);当红细胞MCV<60 f L、60 f L≤MCV<70 f L而RDW>0.2时,PLT-I法与免疫法比较血小板计数,差异有统计学意义(P<0.05);不同组在PLT-F法与免疫法比较差异均无统计学意义(P>0.05)。结论 PLT-F法与免疫法有良好的相关性,PLT-I法对低值血小板计数的准确性有较大影响,当MCV<60 f L或者60 f L≤MCV<70 f L而RDW>0.2时,血小板应该采用流式细胞仪或PLT-F法检测以获得更为准确的数据。
