生长延缓剂对巨尾桉苗生长控制试验

本试验目的主要是探讨生长延缓剂对桉苗高生长控制作用,采用多效唑(PP333)和矮壮素(CCC)对巨尾桉苗处理,在30、60天后测定株高,结果说明即使以200μg/g浓度处理对巨尾桉苗的高生长均具明显延缓作用,延缓作用在供试浓度范围内有随浓度升高而加剧的趋势,而且浓度过高会对植物产生严重药害。药剂对苗木在种植后的生长是否有延缓作用仍需进一步研究,因此在桉树育苗时慎用上述药剂。     

植物生长延缓剂对米老排幼苗生理特性的影响

为深入了解植物生长延缓剂对速生用材树种苗木生理特性的影响,以半年生米老排幼苗为试验材料,采用田间栽培法,测定速生树种米老排幼苗在烯效唑(S3307)、多效唑(PP333)和矮壮素(CCC)3种植物生长延缓剂处理下可溶性蛋白含量、可溶性糖含量、抗氧化物质活性及内源激素含量等生理指标。结果表明:3种植物生长延缓剂对米老排可溶性蛋白和可溶性糖积累均有显著影响(P<0.05),并且随着植物生长延缓剂浓度的升高,可溶性蛋白和可溶性糖含量呈现先升高后降低的变化趋势,其中,P3[浓度为1 200 mg·L^-1的PP333]处理的米老排幼苗可溶性蛋白和可溶性糖含量最高;除S1和S4[浓度为50和200 mg·L^-1的S3307]处理外,植物生长延缓剂处理后,米老排的丙二醛(MDA)含量均显著小于对照组;植物生长延缓剂还有利于提高超氧化物歧化酶(SOD)、过氧化物酶(POD)和过氧化氢酶(CAT)等抗氧化酶的活性;植物生长延缓剂会抑制米老排赤霉素(GA3)和吲哚乙酸(IAA)积累,其中,浓度为1 200 mg·L^-1的PP333抑制...     

怎样种植草坪

塔里木石油勘探开发指挥部利用草坪绿化是从1991年起，先后引进十多种优良草皮、草种，在库尔勒石油生活小区种栽，初步筛选出匐匐茎剪股颖，多年生黑麦草，草地早熟未家族的瓦巴斯、菲尔金、纳苏、亨特、豆科草坪植物的白三叶，四种草坪品系在当地生长发育良好。观察表明：草坪用籽实、分蘖茎繁殖，易于大面积建植，生长迅速，群体长势佳，形成尊层快。土壤疏松肥沃，如管护措施得当，两个月即可覆盖裸土，覆盖率达80％以上。4月5日－11月15日保持叶色鲜绿，鲜绿期在210－235天之间。四种草坪品系生物学特性与生态观察见下表在这里，向大家…     

多效唑在草坪上的应用研究进展

多效唑是一种新型植物生长延缓剂,已在园林植物上得到广泛的应用。综述了国内外多效唑在草坪上的研究进展情况,包括了多效唑对草坪草的生理生化效应,讨论了多效唑在草坪上应用的意义,并提出多效唑实际应用所需解决的问题。     

几种生长延缓剂对瓜叶菊生长发育的影响

在爪叶菊生长期喷施多效唑、烯效唑、比久、矮壮素等四种生长延缓剂，使植株高度降低，叶片减少，叶绿素含量增加，硝酸还原酶活性增强，株型紧凑、生长健壮，花期延长3-5天，观赏价值提高。     

多效唑对5种芍药植株生长影响研究

本文对萌芽期的5种芍药(Paeonia Lactiflora)采用不同浓度的多效唑(Paclobutrazol)进行叶面喷施处理,比较不同处理对芍药的株高、茎粗、冠幅生长状况的影响。结果表明:多效唑处理显著降低了芍药植株的高度和冠幅,使茎粗增大(P0.05),其中以喷洒100 mg/L浓度下的多效唑综合效果最佳。     

矮化剂在草坪上的应用试验

草坪的养护主要包括浇水、施肥、修剪等内容，据测算，草坪修剪费用的占草坪管理直接成本费用3/5左右，因此，怎样使草坪少剪甚至不剪，是降低草坪养护成本的关键。多效唑的矮化机理主要是作用于叶片，通过叶片吸收抑制植株生长，叶片变短，节间缩短。草坪矮化剂（吉林市昌邑区花卉研究所生产）主要作用于植株根部，达到抑制草坪生长，减少修剪次数。1试验材料和方法试验地位于克拉玛依市朝阳公园内，为早熟禾与高羊茅的混播草坪。选用15%多效唑和草坪矮化剂两种试验材料喷施草坪，喷施药剂前修剪草坪，修剪平均高度5．５cm，每种试验材料分…     

冷季型草坪的管理

冷季型草坪,是指最适温度为15-20℃,主要分布于温带和副极地气候带的草坪.其主要品种有早熟禾属的六月禾、加拿大早熟禾、草地早熟禾、林地早熟禾、粗茎早熟禾、一年生早熟禾、剪股颖属的小糠草、细弱剪股颖、匍匐剪股颖.羊茅属的紫羊茅、匍匐紫羊茅、羊茅、硬羊茅等等.冷季型草坪的建植有种子繁殖和营养繁殖两种方法.     

喷施多效唑对普通狗牙根生长的影响

试验结果表明,在普通狗牙根拔节前后喷施多效唑,可明显抑制其主茎和分蘖茎的伸长,缩短节间长,延缓生长速度,增加主茎和分蘖茎粗,解除植株的顶端优势,显著地促进分蘖;但对植株重量增长有一定的抑制作用,且对其地上部分物质积累的影响远大于地下部分。试验得出400 mg/kg是喷施多效唑的适宜浓度,在此浓度下可使普通狗牙根产生明显的矮化效应,且对植株的分蘖量和分蘖茎粗度的影响也大,其生物量稳定,可替代人工修剪。     

多效唑对香花槐组培苗生长的影响

多效唑可抑制香花槐试管苗的生长,使繁殖系数和嫩梢长度都受到影响,在继代培养时,培养基中加入0.1～2.0 mg/L多效唑对壮苗有利,当多效唑浓度超过2 mg/L时,在常温下能达到种质保存的目的.用多效唑处理后,茎纵切面及横切面细胞不仅形态发生了变化,而且细胞壁明显加厚.生根香花槐试管苗用多效唑处理后能明显提高根系活力和...     

多效唑处理对马尾松苗木质量影响

在马尾松育苗过程中应用不同浓度的多效唑进行叶面喷洒试验表明,在苗高20cm左右,间隔15d进行连续2次的叶面喷洒,1000、1500、2000mg/kg浓度能很好地提高苗木质量、抗寒能力和造林成活率,500mg/kg浓度处理效果不明显。3种浓度处理苗木的高径比能控制在较为理想的65左右,侧根数和干物质积累显著增加,木质化程度提高,抗寒能力显著加强,冻害率下降35%,次年造林成活率提高11%,但2000mg/kg浓度处理对次年的新梢生长有一定的影响。     

4种城市园林绿化灌木嫩枝扦插繁殖技术试验

以城市园林绿化树种芽红红瑞木(Cornus stolonifera Cardinal)、紫叶风箱果(Physocarpus opulifolius Diablolo)、金雨点金露梅(Potentilla fruiticosa Golddrop)、蓝叶忍冬(Lonicera korolkowii Srapf)为试材进行嫩...     

Effect of silvicultural treatments on growth,fertility and capsule traits in seedling seed orchards of <Emphasis Type="Italic">Eucalyptus camaldulensis</Emphasis> and <Emphasis Type="Italic">E. tereticornis</Emphasis>

The effects of nutritional treatments and the flowering promoter Paclobutrazol™ on tree growth and fertility were studied in unpedigreed seedling seed orchards (SSOs) of Eucalyptus camaldulensis and E. tereticornis at two locations in southern India. At Pudukkottai, a semi-arid site in Tamil Nadu State, five treatments were applied: (1) untreated control, (2) nitrogen (two doses of urea at 217 g N/tree), (3) nitrogen plus phosphorus (two doses of 312 g single superphosphate), potassium (two doses of 83 g muriate of potash) and trace elements (two doses of 10 g sodium borate and 25 g zinc sulphate), (4) pollarding trees at 4 m height with application of N, P, K and trace elements, (5) drenching with the flowering promoter Paclobutrazol (0.25 ml active ingredient per cm of stem girth) along with N, P, K and trace elements. At Panampalli, a higher-rainfall site in Kerala State, only treatments 1, 2 and 3 were applied. Four replicates of treatment plots sized 18 m × 18 m, with 22–32 trees per plot were set up in each orchard in randomized complete block designs. Untreated plots of E. camaldulensis and E. tereticornis at Pudukkottai displayed 12 and 21% fertile trees, respectively, in the first year of monitoring, while at Panampally the percentage of fertile trees in untreated E. camaldulensis plots was higher at 72%, and that of E. tereticornis similar at 23%. Both species attained greater stem diameter at breast height at age 9 years at the higher-rainfall location but there was no significant impact of fertilizer application on 9-year diameter at either site. Diameter was reduced by pollarding and Paclobutrazol application at Pudukkottai. Only Paclobutrazol produced a significant increase in fertility in both species for four successive years, increasing the percentage of fertile trees to 59 and 71%, respectively, for E. camaldulensis and E. tereticornis 1 year after application. The number of capsules produced per tree also increased significantly with Paclobutrazol application, although the difference was comparatively less by the fourth year. The number of capsules per umbel did not differ significantly between locations, whereas the germination rate varied between treatments although no consistent trends were observed.     

多效唑对大丽花生长及生理特性的影响

用25、507、5、1001、25 mg/L的多效唑,对大丽花＂陇上雄鹰＂进行喷施和根灌处理,研究多效唑对大丽花生长、开花和部分生理指标的影响。结果表明：根施效果优于喷施。喷施浓度以125 mg/L效果较好,矮化率达37.6%,花径增加2.5 cm,叶绿素含量增加,SOD活性达到对照的3.2倍;根施浓度为75 mg/L和100 mg/L时效果最佳,矮化率分别达54.2%和55.9%,花朵增大,叶绿素含量增多,SOD活性为对照的5.9倍。     

多效唑对无患子的矮化效应

采用不同浓度的多效唑对无患子进行矮化试验,结果表明:适宜浓度的多效唑可使无患子高生长减缓、茎杆加粗、叶面积降低、叶绿素含量增高,以多效唑1g·L-1处理对无患子的矮化作用效果最好.     

深圳福田红树林无瓣海桑+海桑群落钙镁钠的累积和循环

研究了深圳福田红树林无瓣海桑 +海桑人工林群落的Ca、Mg、Na元素的吸收、分布、累积和循环。结果表明 ,该群落植物现存量中 ,库存Ca、Mg、Na总量分别为 2 5 975 4 6、10 332 4 6、115 832 16mg·m-2 ,其中地下部分分别为 86 38 93、6 342、894 99 0 1mg·m-2 。该群落Ca、Mg、Na元素生物循环为 :年吸收量分别为 9337 6 2 6、36 73 318、5 0 2 0 3 5 4 7mg·m-2 ,年归还量分别为 4 32 6 96、16 79 2 97、11792 3474 8mg·m-2 ,年存留量分别为 5 0 10 6 6 6、1976 0 2 8、384 11 2 0mg·m-2 ,周转期分别为 :7a、7a、10a。其中Ca、Mg的循环比Na要快     

保定市常见城市绿化树种对PM2.5滞纳能力的研究

为了探究绿化树种对改善城市污染的影响,选取保定市11种常见城市绿化树种,对其滞纳PM2.5能力进行了探讨。利用冠层分析仪(LAI-2000)、叶面积扫描仪和气溶胶再发生器(QRJZFSQ—I)测定各树种的叶面积指数、单位叶面积PM2.5滞纳量,并计算单位绿地面积PM2.5滞纳量,结果表明:叶面积指数、单位叶面积PM2.5滞纳量、单位绿地面积PM2.5滞纳量3个指标,都是针叶树大于阔叶树,说明针叶树对PM2.5的滞纳能力高于阔叶树;针叶树、阔叶树叶面积指数范围分别为2.172 1~3.026 3、0.873 8~2.120 5,单位叶面积PM2.5滞纳量范围分别为0.53~1.39mg/m~2、0.11~0.34mg/m~2,单位绿地面积PM2.5滞纳量范围分别为1.151 2~4.206 6mg/m~2、0.108 8~0.622 8mg/m~2。     

Drought resistance and water use efficiency of conifer seedlings treated with paclobutrazol

Growth and drought resistance of Douglas fir (Pseudotsuga menziesii (Mirb.) Franco), lodgepole pine (Pinus contorta (Loud.)), and white spruce (Picea glauca (Moench) Voss) container seedlings, treated with paclobutrazol at different times and with concentrations up to 2.8 mM, were examined over their second growing season. In two experiments all three species were planted in sand beds in the open and subjected to different levels of moisture stress. Paclobutrazol drenches of 0.3 and 0.6 mM made twice in October, prior to planting the following March, reduced dry weight growth the least, or increased growth in lodgepole pine under dry conditions. Paclobutrazol generally decreased survival under drought stress, particularly if treatment was applied immediately before planting, rather than the previous October. In a third experiment paclobutrazol treated white spruce were grown, in 3.1 L capacity containers filled with peat and vermiculite, at different moisture supply levels and temperatures in growth chambers. Water use efficiency (WUE) was calculated from water use and increases in dry weight of these seedlings over 83 days. Paclobutrazol treatment increased WUE most strongly over the first 31 day measurement period, under all temperature and moisture conditions, but the effect was negligible during the last 24 days of the experiment, and height growth was reduced by treatment. Mineral nutrient concentrations were affected by paclobutrazol, and it was concluded that these and other responsed depended partly on seedling condition at the time of treatment.     

Paclobutrazol affects the resistance of black spruce to high light and thermal stress

Detached needles from 20-week-old black spruce (Picea mariana (Mill.) B.S.P.) seedlings root-drenched with 60 mg of paclobutrazol were exposed to two temperatures (22 and 50 degrees C) and two light treatments (100 and 1900 &mgr;mol m(-2) s(-1) PAR) in a factorial combination for 4 h in vitro. Mean dry weights of individual needles from paclobutrazol-treated plants were approximately 1.9 times heavier than that of needles from untreated controls at 22 degrees C, but no differences were observed following incubation at 50 degrees C. Numbers of cells per needle remained constant in all treatments. Chlorophyll and carotenoid contents per needle were higher in seedlings treated with paclobutrazol than in untreated control seedlings, and the differences were most pronounced in the high temperature plus high light treatment. In low light at 50 degrees C, quantum efficiency of photosystem II was 45% higher in needles of paclobutrazol-treated seedlings than in needles of untreated control seedlings, but quantum efficiency of needles from treated seedlings declined when needles were exposed to high light at either temperature. Peroxidase and superoxide dismutase activities were up-regulated by paclobutrazol, whereas catalase activities were depressed and no significant differences were observed between treated and control needles at 50 degrees C in either light treatment. Paclobutrazol treatment did not moderate the depressive effects of high temperature on total soluble protein or on the activity of ribulose-1,5-bisphosphate carboxylase. In contrast, high activities of phosphoenolpyruvate carboxylase were maintained in paclobutrazol-treated needles under all stress conditions, whereas large losses in activity were recorded in untreated needles at 50 degrees C. Collectively, these observations suggest that paclobutrazol treatment may convey resistance to excessive light and high temperatures by increasing the potential of conifers to limit damage caused by oxidative stress.