色木槭嫩枝扦插试验初报

利用光照喷雾装置，采用ABT生根粉处理色木槭半木质化嫩枝，在不同基质内进行色木槭嫩枝扦插试验。结果表明适宜的激素处理与选用适宜的扦插基质，可提高色木槭的扦插生根率，最高可达90％。     

尾叶桉等植物叶提取液对几种植物插条生根和种子萌发的影响

尾叶桉等植物叶提取液对几种植物插条生根和种子萌发的影响＊黄卓烈林韶湘谭绍满林松煜杨国清莫晓勇关键词尾叶桉落地生根紫竹梅水竹草插条生根种子萌发桉树是相当难生根的植物。当用桉树的成熟枝条扦插时成功率极低［１］，甚至成活率为零［２］。柳树和杨树则是较容易生...     

Vegetative propagation of Colutea istria Mill. from leafy stem cuttings

This study investigates the optimal conditions for the vegetative propagation of the multipurpose leguminous shrub Colutea istria from leafy stem cuttings. The conditions examined included 1) the origin of the cutting (apical, medial or basal), 2) indole-3-butyric acid (IBA) treatment (0, 50, 200 or 400 mg/l), 3) the relative humidity of the propagation environment (high or low), 4) wounding base of cutting, and 5) the season in which the cutting was taken. The rooting ability of the cuttings was significantly influenced by all these factors. Winter cuttings obtained from the middle and base of the branch showed a greater rooting capacity than those harvested from the apical area, while autumn cuttings harvested from the middle and apical areas of the branch showed a greater rooting capacity than those harvested from the base. Winter cuttings showed the best rooting capacity than autumn cuttings. IBA treatment (200 mg/l), high humidity (98-100%), and wounding increased the rooting capacity of the cuttings. The sprout of new leaves was higher in basal cuttings, while IBA and wounding also significantly enhanced the root number of rooted cuttings. A method for vegetatively propagating C. istria plants is given.     

金丝垂柳扦插繁殖试验

金丝垂柳扦插繁育技术的研究结果表明 :金丝垂柳插条主要以皮部生根为主 ;ABT 1号生根粉 10 0 0× 10 -6mg/ ml处理 ,促进插条生根效果最显著 ,插穗长势最好。其它处理效果由强到弱为 ABT 1号生根粉 5 0 0× 10 -6mg/ ml、南林 I型生根粉、 ABD生根剂 10 0 0× 10 -6mg/ ml和清水。     

台湾杉木幼树侧枝扦插试验初报

从５年生台湾杉木幼林中选择优良单株，利用树冠中上部枝条进行扦插试验。结果表明：台湾杉木扦插生根与愈伤组织的形成关系不大，属皮部生根型；用不具顶芽的１年生二级侧枝作插穗，穗长８ｃｍ，去除插穗下部２／３的针叶，用１００×１０￣（－６）ＡＢＴ＿１生根粉处理４小时，插于粘性黄心土上效果最好。     

The use of isozyme genetic markers to estimate the rate of outcrossing in a Sitka spruce (Picea sitchensis (Bong.) Carr.) seed orchard in Scotland

Effects of genotype, collection date, auxin treatment, crown position and artificial chilling on rooting and subsequent vegetative growth of Cupressus sempervirens L. softwood cuttings taken from 13-year-old plants were evaluated. Three different clones (318, 296 and 22) previously selected for resistance to cypress cortical cancer caused by Seiridium cardinale were used. In all these clones, both the IBA treated and the untreated cuttings showed seasonal periodicity of rooting. Untreated cuttings rooted best when collected in April (up to 49% for the best clone, i.e. 296) and rooted very poorly in July and October. Auxin treatments appeared unable to overcome this periodicity, as the cuttings taken in July and October did not respond to IBA stimulation. However, in January and April, IBA treatments enhanced adventitious root formation of poorly rooting clones (318 and 22), as well as of clone 296, which performed best (89%) when cuttings were treated in April with 1.5% IBA. Cuttings of each clone collected in the lower third of the crown of the donor trees showed a significantly higher rooting percentage, when compared with those from the upper third. A 4-week post-severance chilling treatment (4°C) significantly enhanced the rooting capacity of cuttings taken in January, while a longer chilling treatment (8 weeks) had a negative effect. The subsequent growth of the rooted cuttings was not affected by either the crown position of the severed cuttings, or the genotype.     

饲料型四倍体刺槐嫩枝扦插试验初报

根据四倍体刺槐自根能力弱的特点,利用其嫩枝进行全光喷雾扦插繁殖。在同等试验条件下,与匈牙利刺槐进行对比,经多种激素处理,结果表明:1 a生苗的嫩枝较2 a生苗的嫩枝易生根,匈牙利刺槐较四倍体刺槐易生根;用甘霖1号速蘸发根剂处理的效果最好,生根率可达60%~88%。     

福建山樱花扦插繁殖及其影响因子研究

在塑料拱棚下进行福建山樱花半木质化枝条扦插繁殖试验,分别进行了不同扦插繁殖时间、不同浓度的ABT1号和IBA处理、不同扦插基质和添加钙镁磷对生根促进剂提高福建山樱花扦插生根的影响试验及综合试验。结果表明,福建山樱花半木质化枝条扦插繁殖以冬末春初为适宜时期,以2份素沙+1份粘性黄土为扦插基质,插穗经IBA 2 500 mg.L-1+钙镁磷沾根I、BA 3 750 mg.L-1+钙镁磷沾根或IBA 5 000 mg.L-1浸泡处理均有良好的促进生根效果,平均插穗生根率和平均一级不定根数最高分别可达86.67%和4.68条。     

Observations on the rooting patterns of some agroforestry trees in an arid region of north-western India

The present study deals with root architecture of 6-year-old trees of 9 indigenous and 3 exotic species growing in arid climate of north-western India. Observations, made on excavated root systems (3 tree replicates of each species) showed large variation in horizontal and vertical spread of roots. In Morus alba, Melia azedarach and Populus deltoides, the roots were confined to 80 cm, while in Prosopis cineraria, Acacia nilotica and Eucalyptus tereticornis, roots penetrated more deeply to 233 cm. The number of total roots ranged from 103 in Acacia catechu to 1932 in Eucalyptus tereticornis, and 62 to 80% of the roots were less than 2 mm in diameter. The primary roots were more horizontal than the secondary roots. The total root biomass varied from 2.2 kg in Acacia catechu to 30.6 kg^–1 tree in Populus deltoides, and top 30 cm soil contained 42 to 78% of the total biomass. The implications of the results are discussed in the context of the ecological niche of the species, and its usefulness in agroforestry systems.     

石灰石粉施用量对重庆酸雨区马尾松林下木荷生长的影响

重庆是我国酸雨发生最早且其污染最严重的地区之一。由于长期遭受酸雨影响,这里的森林受害明显,经济和环境损失巨大。马尾松(Pinus massonianaLamb.)和木荷(Schima superbaGardn.etChamp.)都属于重庆的重要乡土树种,马尾松在造林中被广泛使用,木荷是优良的生物防火树种,并因