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湖南烤烟质量与气候因子的关系研究 总被引:9,自引:3,他引:9
对湖南5个烤烟主产县(市)35份烟叶样品的的化学成分、评吸得分与烟样产地的33项主要气象数据进行了相关及回归分析,阐述了烟叶化学成分中的总糖、还原糖、烟碱、钾、总氯、糖氯比、糖碱比和烟叶评吸质量中的香气质得分、香气量得分、浓度得分、刺激性得分与烟叶产地烟季中的温度、日照、降水量、蒸发量、相对湿度等气候因子的关系.其中表现为极显著关系的指标有温度因素中的采烤期70 d积温、烟季≥35℃天数;光照因素中的烟季第2,3,5月日照百分率和日照时数、采烤期日照百分率和烟季日照总时数、日照百分率等因素. 相似文献
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以武陵山区女儿寨小流域为研究区,根据流域2004—2008年77场典型降雨径流观测资料,研究流域次降雨径流与产沙特征。结果表明:77场降雨中,以25.0~49.9 mm和50.0~100.0 mm的降雨为主,占降雨总数的67.53%,降雨强度以10~40 mm/h为主;降雨量与径流深和产沙模数呈现较为显著的线性相关性,降雨量、径流深及降雨侵蚀力对产沙模数均有明显影响,其中以径流深和产沙模数的拟合效果最好,R2达0.684 7;在对降雨、径流、产沙共12个指标进行相关性分析的基础上,对径流深、洪峰流量、产沙模数、降雨侵蚀力4个主要指标进行多元逐步回归拟合,R2均在0.85以上,并通过显著性检验,回归方程拟合效果较好,可用于相关指标的定量计算;流域的产沙量主要取决于几次大的暴雨,汛期的降雨决定流域的产流产沙状况。研究结果可为流域水土流失监测和预报、水土保持措施合理配置等提供相应参考。 相似文献
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AIM:To evaluate therapeutic effect of Zhiqi oral solution on adult periodontitis.METHODS:Supragingival scaling and root planning were carried out in 100 patients with adult periodontitis. Then the patients with periodontitis were divided into two groups randomly. 32 patients in the control group took orally Metronidazole and 68 patients in the experimental group took orally Zhiqi oral solution. The pain reaction, bleeding index, probing depth, plaque index, changes of microorganisms in periodontal pocket and side effect before and after the treatment were observed at a 30 days observation period.RESULTS:Zhiqi oral solution had a therapeutic effect on periodontitis, compared with the control group (P<0.05). The bleeding index and plaque index in patients of two groups were improvedobviously compared with before treatment (P<0.05). However Zhiqi oral solution had an obvious effect on decreasing the probing depth(P<0.05).CONCLUSION:Zhiqi oral solution improves effectively the condition of periodontium, and its supplementary treatment effect on adult periodontitis is obvious. 相似文献