地被植物不同基质繁殖试验研究

笔者对小丑火棘、亚菊、小叶牛至等几种地被植物采用不同基质繁殖的生根情况进行了初步研究,结果表明:碳化谷壳作地被植物扦插基质,其效果较好,扦插时间短、生根量大、生根率高。     

小丑火棘扦插繁殖技术

小丑火棘是优良的观赏树种,具有良好的市场前景.经4年的研究开发,总结出了扦插繁殖配套技术,包括商品苗定位、穴盘苗和网袋苗扦插技术和建立采穗圃栽培技术,并进行了区域试验,为推广应用提供可靠的实践依据.     

火棘引种栽培及其在城市园林绿化中的应用研究

本文报道引种野生火棘，繁殖火棘苗的栽培管理技术关键，并对其在城市园林绿化中的应用效果和前景进行了分析评价。     

彩叶地被植物栽培试验

在湖南省森林植物园内对26种彩叶地被植物进行了繁殖和栽培试验,对其适应性进行了观察与分析,筛选出了金焰绣线菊、金叶连翘、金叶大花六道木、银姬小腊、金脉连翘、小丑火棘、银边石菖蒲、金心黄菖蒲、金叶苔草、大叶花叶络石、金边阔叶麦冬、花叶凤梨薄荷、花叶锦带花、金叶过路黄、书带草、红脉酸膜、紫叶酢浆草、花叶忍冬、花叶马兰、金山绣线菊等20种适合长沙地区栽培的优良彩叶地被植物。     

火棘的栽培技术与园林应用

火棘是分布广泛的优良的园林绿化、植物造景材料,对其生态习性、繁殖栽培技术和园林应用作了介绍。     

火棘繁育技术

火棘（ｐｙｒａｃａｎｔｈａｆｏｒｔｕｎｅａｎａ）又名火把果，属蔷薇科，火棘属。其繁殖方法通常采用播种、扦插和压条法。一、播种：火棘果期８～１０月，可在１０月底～１１月上旬采收。采收后，除去叶片、枝刺、果柄等杂物，置于阴凉处摊开通风约１０～１５天，并每...     

欧洲火棘引种及其抗寒性的初步研究

采用电导法对引种的欧洲火棘对照中国火棘进行抗寒力分析测定。结果表明:欧洲火棘有较稳定的电导率,其半致死温度高于中国火棘,利用电导法测定的抗寒性与越冬形态表现的观察结果一致。     

我国火棘资源研究现状及展望

为更好地开发利用火棘这一野生可食果及观赏植物资源，对近十年来我国火棘资源的研究成果和发展前景进行了述评，对火棘的开发利用提出建议。     

火棘苗木的培育技术

火棘，又名火把果，属蔷薇科小灌木。常见于山坡、地埂、公路旁。生命力极强。秋天，火棘树红果累累，非常美丽。近几年来，用火棘制作盆景、绿篱开始兴起。其育苗栽植技术简介如下。     

火棘在海南引种及育苗技术研究

研究了火棘在海南引种种植的适应性;采用赤霉素和硫酸溶液处理火棘种子,观察种子萌芽情况。结果表明,火棘在海南能够正常生长;用赤霉素和硫酸溶液处理火棘种子后均能有效提高种子发芽率。     

火棘扦插繁殖的研究

通过3年、2个扦插季节的5次试验,分别用NAA、生根剂、根旺和生根粉对火棘插条进行了处理,结果表明：不同的药剂处理对提高火棘扦插成活率没有明显效果,而扦插基质对成活有着决定性作用;春季扦插的效果优于夏季扦插。     

The Effect of Landfill Leachate Spraying on Foliar Nutrient Concentrations and Leaf Transpiration in a Northern Hardwood Forest, Canada

The effect of municipal solid waste (MSW) leachate spray irrigationon a mature northern hardwood forest was investigated. Canopyfoliar samples and stem increment cores were collected fromtwo indicative species, sugar maple (Acer saccharum Marsh.)and American beech (Fagus grandifolia Ehrh.), within each ofa heavily sprayed, lightly sprayed and control area. Foliarconcentrations of N and P were significantly higher in bothmaple and beech foliage within the sprayed areas when comparedto an unsprayed area (control). Levels of Mg and K were markedlyhigher in maple but not beech foliar samples within the heavilysprayed areas when compared to foliage sampled within the unsprayedcontrol. While no significant trends were observed within themaple foliage, both Fe and B levels increased significantlyin beech foliar samples obtained from within the heavily sprayedarea in comparison to foliage samples from the control. Directporometric measurements of the transpiration rate and diffusive(stomatal) resistance of canopy and understory plant leavesrevealed a significant increase in diffusive resistance anda decline in transpiration rate with leachate spraying. Afterfour years of spraying a significant effect of leachate applicationon radial stem growth of both maple and beech trees has notbeen observed.     

Winter desiccation and injury of subalpine red spruce

Montane red spruce (Picea rubens Sarg.) in the northeastern United States has undergone a decline during the past two decades. One symptom associated with the decline syndrome is the episodic browning of first-year foliage in early spring. To examine the potential role of winter desiccation in this browning, the water relations of red spruce foliage in a subalpine forest on Mt. Moosilauke, New Hampshire, USA, were monitored from January to May, 1989. All sampled trees lost water during the winter and the first-year foliage on some trees turned brown in early spring. The relative water content of first-year shoots during the winter was a significant predictor of spring browning; red spruce trees that showed browning had desiccated faster and reached lower relative water contents. Damaged trees also had more closely packed needles and lower cuticular resistances to water loss. The first-year shoots had a significantly lower average relative water content than older shoots before and after browning. Cuticular resistance to water loss decreased with elevation. Sun-exposed shoots lost more water than shaded shoots because of solar heating of needles. Winter desiccation can occur before the decline-related spring browning of red spruce foliage.     

Seed Maturation Indicators in Pyracantha crenulata Roxb. in Kumaun Central Himalaya

Fruits of Pyracantha crenulata were collected from two locations varying by approximately 550 m in elevation from south aspect for assessing seed maturation indicators. The mean seed size (length×diameter) across the collection dates varied between 1.61 ± 0.7 and 4.93 ± 0.06 mm² across both the locations. The seed moisture content negatively correlated with germination. The change in fruit colour from dark green to light orange, the range of fruit moisture content (30.43% ± 0.06 to 36.10% ± 0.25) and the seed moisture content between 68.8% ± 0.68 and 71.6 ± 0.62 coincided with maximum germination and appear to be major indicators of seed maturation in Pyracantha crenulata.     

Biochemical composition of loblolly pine reflects pollutant exposure

Under experimental conditions, the growth of loblolly pine (Pinus taeda L.) is often responsive to ozone at near-ambient concentrations. However, little is known of the biochemical changes associated with this or other pollutants. Loblolly pine seedlings in open-top chambers were exposed to combinations of ozone (sub-ambient, ambient, or twice-ambient), acidic precipitation (pH 3.8 or pH 5.2) and soil magnesium (0.15 or 0.32 microg g(-1) exchangeable Mg) for three growing seasons. The effects of these treatments were greater in foliage than in stems or roots. The largest treatment effect was a 50% decrease in the starch concentration of current-year foliage from the twice-ambient ozone treatment compared with current-year foliage from the sub-ambient ozone treatment. Responses to ozone were consistent with the hypothesis that ozone-induced growth reductions are associated with depletion of carbohydrate reserves resulting from injury compensation and repair processes or reduced carbon fixation or both. Addition of acidic precipitation, and to a small extent Mg, decreased sugar concentrations of tissues; however, this effect appeared to be mediated by nutrient addition rather than by acidity per se. Given the role of carbohydrates in plant resistance to environmental stress, the sensitivity of carbohydrates to experimental treatments demonstrates the potential for indirect effects of ozone, acidic precipitation, and soil properties on stress resistance. Noncarbohydrate constituents were largely unresponsive to the experimental treatments. These findings imply that tissue carbohydrate analysis may be useful for assessing the impacts of pollutants in forest ecosystems.     

观赏植物火棘研究进展

火棘是一种具有较高观赏价值的植物。述评火棘的生物学、形态解剖学、栽培学、化控及应用研究，并对今后研究方向进行了探讨。     

不同处理对火棘种子发芽的影响

采用三因素、四水平的正交设计方法,研究了浸种温度、赤霉素、硝酸钾对经浓硫酸处理后的火棘种子发芽的影响。结果表明：浓硫酸处理30min及适宜的温度15～45℃是提高种子发芽能力的关键。     

40种木本植物水分逸出强度与燃烧性分析

经对水分逸出强度与含水率，绝干比重相关分析认为，水分逸出强度为木本植物生评价的独立因子和重要因子。应用水分逸出强度和含水率两个因子，对４０种木本植物的燃烧性分析后认为；化香，山桐子为难燃性乔木胡颓子，火棘为难燃性灌木。     

马尾松赤枯病发生规律及其防治技术

马尾松赤枯病是由枯斑盘多毛孢引起的，此病的发生与气候，地形，地势，坡向，坡位和松林经营管理等情况密切相关，通过加强营林措施，增强松树抗病力；清除病原，隔断侵染源，实施放烟，撒灰及叶面喷雾等防治措施，防治效果较好。