薜荔茎段的组织培养与植株再生技术

以薜荔茎段为外植体,研究了其丛生芽诱导和快繁技术.实验结果表明,B5为最适合的基本培养基,根据正交试验结果,各激素对诱导丛生芽的作用大小为:6-BA>NAA>KT>IAA,诱导丛生芽的最佳培养基为:B5 1 mg/L NAA 0.1 mg/L IAA 1mg/L KT 2 mg/L 6-BA 蔗糖20 g/L 琼脂0.75%;生根培养基以B5 3 mg/L NAA 0.1 mg/L IAA 1 mg/L KT 2 mg/L6-BA 蔗糖20 g/L 琼脂0.75%为宜.     

三种榕树的板根生长特征及其在城市绿化的应用研究

榕树在广东城市绿化中颇受青睐。然而,榕树板根的破坏作用也日益被关注。大榕树一般都具有发达的板根,且穿透力强,能够拱破路面、树池和墙体等交通或建筑设施。对小叶榕（Ficus microcarpa）、黄葛榕（F. virensvar. sublanceolata）和高山榕（F. altissima）的板根高度、板根幅度与胸径调查分析,总结3种榕树板根的生长特征,并对现有板根处理措施进行了分析评价,对城市绿化中榕树板根的合理处置提出了建议。     

无花果花芽分化期芽ABA和IAA含量的变化

果树在花芽分化的各个阶段几乎都要受到激素的调节。相关的研究已经表明，GAs可以抑制多种等果树的花芽分化，CTK可以促进果树的花芽分化。ABA、IAA对成花的作用，看法尚不一致。Luck—will认为果树成花取决于促花物质和抑花物质之间出现的一种平衡关系，并且指出高的CTK／GAs值有利于成花。而对芒果和荔枝的研究结果也支持了Luckwill的假说。     

运用BIB-LCJ审美评判法评价榕属植物景观

榕属植物在园林中形成的景观大体可归纳为7种类型：孤植景观、行道树景观、盆景景观、丛植群植景观、特色景观(附生与绞杀景观)、绿篱景观、地被景观。运用BIB-LCJ审美评判法评价7种类型的榕属植物景观，研究公众对各种榕属植物景观的审美趋向，进而讨论如何配置榕属植物，营造符合公众审美的植物景观。     

云南普洱黄金榕主要病虫害的发生及防治

调查发现,云南普洱黄金榕上的虫害有3种、病害2种,简述其为害特点、发生规律及其防治措施。     

小叶榕对土壤铅镉污染的抗性和修复潜力研究

采用盆栽试验探讨小叶榕(Ficus microcarpa)对土壤Pb、Cd污染的适应性,并采用熵权TOPSIS模型综合评价其对Pb、Cd污染的修复潜力。结果表明,土壤低含量Pb促进小叶榕生长而高含量Pb抑制小叶榕生长,500 mg·kg~(-1)Pb处理下,小叶榕地下部和总生物量比对照分别增加28.92%和30.09%,氮、磷、钾吸收量分别增加11.74%、97.59%和61.80%,而1 500 mg·kg~(-1)Pb处理对小叶榕生长发育表现出明显抑制作用。低含量Cd(10 mg·kg~(-1))对小叶榕生物量和氮、钾元素吸收无明显影响,≥25 mg·kg~(-1)Cd抑制小叶榕生长。复合Pb、Cd污染土壤中,小叶榕对Cd比较敏感,而对Pb表现出较好的耐受性;与Pb_(1000)Cd_(25)处理相比,增加土壤中的Pb含量(Pb_(1500)Cd_(25))或Cd含量(Pb_(1000)Cd_(50))仅显著增加小叶榕根部的重金属含量。与Pb_(1500)Cd_(25)处理相比,增加土壤中Cd的含量(Pb_(1500)Cd_(50))会抑制小叶榕根部对Pb的吸收,但会促进地上部对Pb的吸收。熵权TOPSIS模型评价结果显示,单一Pb、Cd污染中小叶榕生长及养分吸收状况综合评价排序为:Pb_(500)Cd_(10)CK_1Pb_(1000)Cd_(25)Pb_(1500)Cd_(50),即小叶榕在土壤Pb含量为500 mg·kg~(-1)时适应性最好。Pb、Cd复合污染中小叶榕吸收重金属能力综合评价排序为:Pb_(1500)Cd_(50)Pb_(1500)Cd_(25)Pb_(1000)Cd_(25)Pb_(1000)Cd_(50)CK_2,但Pb_(1500)Cd_(50)、Pb_(1500)Cd_(25)处理小叶榕的生长和养分元素吸收均受到抑制,因此小叶榕适于修复Pb、Cd含量分别低于1 000、25 mg·kg~(-1)的Pb、Cd复合污染土壤。     

地果的光能利用特性及叶面积指数对土壤营养的响应

研究了地果Ficus tikoua的光能利用特点和地果叶面积指数对土壤营养的响应。结果表明:1)地果光饱和点为1 124 μmol/(m2·s),光补偿点接近0,因此地果具有较宽的光强适应范围;2)地果水分利用效率为1.45～15.8,在光合有效辐射达500 μmol/（m2·s）时达到最大;3)地果斑块的叶面积指数处于0.662.67 m2/m2,平均为1.51 m2/m2,与其它园林绿化植物相比较低;4)叶面积指数能对土壤营养中的水分和全N含量变化作出响应,对有机C、有机P、有机K的含量变化不敏感。     

Diurnal Photosynthesis and Transpiration of Ficus benjamina L. as Affected by Length of Photoperiod,CO2 Concentration and Light Level

Abstract

The diurnal net photosynthesis of Ficus benjamina L., cultivar Cleo, was studied at different daylengths (12, 18 and 24 h day^?1), photosynthetic photon flux densities (40 and 120 μmol m^?2 s^?1 PPFD) and CO₂ concentrations (350 and 700 μmol mol^?1). Net photosynthesis increased to a maximum after 5–6 and 6–7h of light at 12 and 18h day^?1photoperiods, respectively, followed by a decrease towards the end of the photoperiod. At a photoperiod of 18 h day^?1 similar diurnal curves were found at 350 and 700 μmol mol^?1 CO₂, and at 40 and 120 μmol m^?2 s^?1 PPFD. Five days after the photoperiod was changed from 18 to a 24h day^?1the diurnal rhythm disappeared. Transpiration followed the same diurnal rhythm as that for photosynthesis. The water-use efficiency was enhanced by raising the CO2 concentration. A decrease in the CO₂ concentration from 700 to 350 μmol mol^?1after six days at high CO₂ first significantly decreased the photosynthesis, but three days later it reached the same level as that at high CO₂.     

Accumulation and utilization efficiency of potassium in ramie varieties

Difference in nutrient utilization efficiency of genotypes of crops is attracting more and more attention of plant nutrition and breeding scientists. This experiment was carried out to reveal whether genotypic variation of potassium (K.) utilization efficiency exists in ramie [Boehmeria nivea (L.) Gaud.], by measuring K concentrations and accumulations in different organs in relation to the dry matter and fiber productivity of six field growing ramie varieties with evident dissimilarity in growth vigor. Potassium concentration decreased in leaves, petioles and seeding organ, but increased in stem wood and in the raw fiber of high raw fiber yield (RFY) varieties at the late growth stage. For different parts, stem bark attained the largest K concentration, followed in order by petiole, stem wood, seeding organs, raw fiber and leaves. Potassium concentration of stem wood, bark and raw fiber, respectively, demonstrated positive and significant correlation with RFY. Potassium utilization efficiency declined by harvest time. The results suggested that the ramie varieties with high biomass and RFY and K consumption such as Xiyeqing can be planted under the condition of abundant K resource, while Nindu‐Ramie variety may be used as high K efficient genetic resource for its ratios of RFY (g) and biomass (g) to K consumption (g) are over 25 and 114, respectively, in spite of its low biomass and RFY.