[Objective] The aim was to investigate the effects of Primo MAXX growth regulator on growth of Bermuda grass,explore appropriate application concentration of Primo MAXX on Bermuda grass,and provide basis for the application of Primo MAXX in Bermuda meadow.[Method]The height,leaf colour and the aerial part＇s fresh weight of Bermuda grass treated with different concentrations were researched using single factor random block test.[Result]Primo MAXX application effectively reduced the height in all treatment without significant difference;appropriate application of Primo MAXX can enrich the color;and 35 days after application,Bermuda grass roots were become thicker.[Conclusion]The application of Primo MAXX with effective dose of 150-300 g/hm2 on Bermuda grass in southern China is more appropriate.
薇甘菊(Mikania micrantha H B K.)是一种危害极大的外来入侵农林杂草。为了预测薇甘菊在中国的适生区,该文运用预设预测规则的遗传算法(genetic algorithm for rule-set production,GARP)和最大熵(Maximum Entropy,MaxEnt)模型对薇甘菊在中国的适生区进行预测,并运用受试者工作曲线(receiver operating characteristic,ROC)分析方法对2种模型的预测结果进行分析,选出最优模型进行预测,同时对环境变量进行刀切法分析,判断环境变量对薇甘菊分布的影响。结果表明,GARP和MaxEnt模型ROC曲线下面的面积AUC(area under the ROC curve)均值分别为0.910和0.971,MaxEnt模型的AUC值更大,预测结果更准确,运行速度更快,更适合用于薇甘菊的适生区预测;对环境变量进行刀切法表明,海拔和季节性降水量方差对薇甘菊的分布影响最小,年温变化范围、年降水量、最湿月份降水量、最湿季度降水量、温度变化方差这5个环境变量对薇甘菊适生区预测影响最大;预测结果显示薇甘菊在中国大陆的适生区主要集中在海南、广东、广西、香港、澳门、云南、福建、西藏、贵州等省,其中西藏东南部和西南部、贵州西南部、福建中南部等地区应该加强监测及预警。
