为了研究朱槿(Hibiscus rosa-sinensis Linn.)对干旱胁迫的响应,以朱槿盆栽幼苗为材料,进行干旱胁迫及复水试验,并对朱槿相关的生理指标进行测定.结果表明,叶片叶绿素随干旱胁迫强度的增加呈明显下降趋势,渗透调节物质、丙二醛(MDA)、保护酶(POD、SOD)活性均随干旱胁迫强度的增加而增加,复水后有所恢复,但都没有完全恢复到胁迫前的水平.综上,朱槿的自身调节能力较好,对干旱胁迫有较好的适应能力.

[Objective]Daylight change rule and the influence of different light qualities on flowering and other physio-logical indicators of Bougainvillea spectabilis Willd.were studied to provide technical reference for B.spectabilis flowe-ring regulation.[Method]With Brilliant Red Bougainvillea as experimental material,physiological indicators such as net photosynthetic rate(Pn)and transpiration rate(Tr)were determined every hour on a summer day under natural lighting con-ditions in Nanning.The daily variation dynamic figure was drew.Treated by purple,red and white light qualities and natu-ral light,flower number,new branch length,chlorophyll content were determined after 45 d and 70 d of light irradiation. The effects of different light qualities on physiological indicators of B.spectabilis were analyzed.[Result]Daily variation of Pnand Trpresented asymmetric bimodal curve with obvious midday depression phenomenon.After 45 days and 70 d of purple light treatment,the flower numbers were 171 and 23,increase rates were 612.50% and 2200.00% respectively.At the same time,the chlorophyll a content,chlorophyll b content,and chlorophyll a+b content were greatly higher than other groups.The effects of B.spectabilis flowers treated by these light qualities were as follows:purple light>red light>white light>natural light.After 45 days and 70 days light irradiation,new branch growth of B.spectabilis in all treatments were inhibited.In purple light treatment,after 45 d and 70 d,new branch lengths were 12.34 and 10.55 cm,growth rates were-32.34% and-6.88% respectively,which were largely lower than other groups.Therefore,the inhibition effects of purple light treatment was the most obvious.[Conclusion]Under natural lighting conditions of summer day in Nanning,Brilliant Red Bougainvillea has obvious midday depression feature.Purple light is more favorable to the growth and the synthesis of chlorophyll.After using purple light to process B. spectabilis in production,the flower number at full-bloom stage in in-creased,flowering period is prolonged,new branch grows less and its ornamental value is promoted.

[目的]筛选防除黄金榕上日本菟丝子的安全、高效除草剂,为园林菟丝子防控提供科学依据.[方法]选用20种除草剂对接种了日本菟丝子的黄金榕进行茎叶处理,分别在药后1、5、10、20、30 d调查记录日本菟丝子中毒及黄金榕药害症状;药后30 d调查不同除草剂对日本菟丝子的防效及对黄金榕的抑制率.[结果]6％菟丝特AS 30mg/L和41％草甘膦异丙胺盐AS 365 mg/L对日本菟丝子的防除效果分别达90.55％和82.14％,对黄金榕新枝生长速率抑制率分别为9.89％和10.99％,属高效且安全等级1级;5％咪唑乙烟酸AS 134 mg/L、10％双草醚SC 56 mg/L、38％莠去津SC 1265 mg/L、10％苯磺隆WP 333 mg/L、4％烟嘧磺隆SC 89 mg/L和25％啶嘧磺隆WDG 55 mg/L对日本菟丝子的防效为56.93％～73.74％,对黄金榕新枝生长抑制率为12.09％～17.58％,属中效且安全等级1级;5％精喹禾灵EC89 mg/L、12％噁草酮EC 577 mg/L、96％精异丙甲草胺EC 2131mg/L、10％苄嘧磺隆WP 18 mg/L、24％乙氧氟草醚EC427 mg/L和33％二甲戊灵EC 1835mg/L对日本菟丝子的防效为0.63％～45.38％,对黄金榕新枝生长抑制率为2.20％～25.27％,属低效或无效,安全等级为0级或1级;90％环嗪酮WP1998mg/L、48％百草敌AS 427 mg/L、72％2,4-滴丁酯EC 640 mg/L、56％2甲4氯钠盐SP 745mg/L、20％氯氟吡氧乙酸EC 356 mg/L和80％敌草隆WP 2136 mg/L对日本菟丝子的防效为63.24％～100.00％,对黄金榕新枝生长抑制率为51.65％～100.00％,属高效或中效,安全等级为3级或4级.[结论]6％菟丝特AS 30 mg/L和41％草甘膦异丙胺盐AS 365 mg/L对日本菟丝子有较高的防除效果,且安生性较高,是防除黄金榕上日本菟丝子安全、高效的理想药剂.

本文主要介绍了阴生地被植物在南宁园林绿化中的应用情况。