黄杞容器扦插繁殖技术试验研究

通过正交试验设计L9（34）深入研究了使用不同种类生根促进剂（H ）来处理母株不同采插穗部位的插穗（F ）和插穗不同基部下切口型（E ）对黄杞扦插生根率、生根数及生根长的影响差异。试验结果表明：采用生根促进剂ABT －1＃（H1）＋母株下部采的插穗（F3）＋基部下切口型为双削面（E2）,即 H1 F3 E2组合试验效果最好,其平均生根率高达86．8％、平均生根数8．8条、平均生根长达18．6cm。     

胆木硬枝扦插育苗研究

以1年生胆木萌芽条作试验材料,对不同径段、不同生根剂种类和浓度及不同基质进行生根培养试验。结果表明:本试验研究范围内比较理想的生根剂种类为ABT-1,浓度为800倍溶液,适合扦插的插穗径段为0.5～1.0cm,最好的基质为砖红壤土。     

樱梅嫩枝扦插育苗技术

总结了樱梅嫩枝扦插育苗技术,包括圃地选择、设施建设、插条采集与处理、扦插、肥水运筹、温湿度与通风管理、病虫害防治、扦插苗炼苗与越冬等内容,以期对樱梅的栽培提供技术参考。     

Rooting of baldcypress cuttings

A test of the rooting performance and growth of cuttings from 1-year-old and 25-to 50-year old baldcypress (Taxodium distichum L.) branch tips is reported. Rooting of cuttings from one-year-old trees averaged 75% (0.1% IBA treatment) and 88% (control), cuttings from 25 to 50-year-old trees averaged 12% in both the IBA treatment and the control treatment. Indole-3-butyric acid at a 0.1% concentration did not enhance rooting, but resulted in a significant increase in shoot dry weight on cuttings from one-year-old trees. The results of this experiment suggest that cuttings from mature baldcypres trees have the potential to root, thereby, additional rooting techniques such as girdling and stump sprouts is worthy of pursuing.     

Restoration of the mangrove vegetation in the Mahanadi delta,Orissa, India

In India, mangroves occupy 6740 km² of which the Mahanadi delta andBhitarkanika mangrove forests of Orissa cover 191.44 km², most of whichhas been severely overexploited. World wide concern to conserve mangrovesnecessitated propagation of mangroves to re-establish them on barren andswampy land along tidal creeks around Paradeep port of Orissa. Avicenniaofficinalis, Aegiceras corniculatum, Bruguiera parviflora, B. sexangula,Ceriops decandra, Excoecaria agallocha, Heritiera fomes, Kandelia candel,Rhizophora mucronata, Sonneratia apetala were vegetatively propagated andplanted over 10 ha of degraded salt-marshy wetlands of Mahanadi delta inpure and mixed stands depending on the intensity and the frequency of tidalinundation at the experimental site. Survival was significantly higher(80%) in S. apetala followed by A. officinalis, R. mucronata, K.candel and H. fomes (70–75%). S. apetala recorded the maximumgrowth in height (3.0 m after 2 years) whereas C. decandra showed theminimum growth (0.5 m). Growth performance was better with plants in mixedstands than the plantation with single species. This gives us hope topropagate and re-establish mangroves for conservation in scientificallymanaged plantations in a physiologically arid environment.     

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...     

Stem respiration in leafy cuttings of Prosopis juliflora during the rooting process

An oxygen electrode was used to estimate the respiration rate of basal 1 cm sections of Prosopis juliflora cuttings. The respiration rate per unit dry mass decreased linearly with increasing diameter at a rate of 0.42 nmol0₂g^–1s^–1mm^–1 between the range of 1–3 mm diameter. However, as a result of increased mass, total respiration for the whole 1 cm section of tissue increased linearly with increasing diameter. The average respiration rate of the basal 1 cm of stem tissue, measured 14 days after insertion in the propagator, was almost double that of the 1 cm section of tissue above it (1.01 nmol0₂g^–1s^–1 compared to 0.57 nmol0₂g^–1s^–1). The value of this technique as an aid to our understanding of the development of adventitious roots is discussed.     

油松嫩枝扦插育苗试验

用油松嫩枝作插穗，在粗河沙中扦插育苗，插后先形成愈合组织，后从愈合组织处生根，皮部不生根．以浓度１０００μｇ／ｇ萘乙酸处理生根率最高，为５７．７％，移栽成活率为９４．９％。     

Inducing long-shoot growth for vegetative propagation of western larch

This study evaluated methods to release from suppression both short shoots on lower stems and developing buds on leaders of western larch (Larix occidentalis Nutt.) seedlings, in order to increase the number of long shoots suitable for stem-tip cuttings. Treatments included application of the cytokinin N-6-benzyladenine (BA), horizontal stem bending, and decapitation on container-grown 1.5-year-old seedling ortets. The rate of release of suppressed growth of short shoots on the basal stem segments increased from 15% to 83% after spraying with 200 ppm BA and doubled on unsprayed horizontally-bent stems. Syllepsis on the upper stems increased by 19% following decapitation and by 32% after a combination of decapitation and BA treatments. Although these treatments resulted in large increases in the numbers of long shoots available for stem cuttings, the rootability of BA-treated shoots needs assessing before use in operational programs.     

Browse yield and nutritive value of two Salix species and Dorycnium rectum in New Zealand

The willows Salix matsudana x alba and S. kinuyanagi, and the leguminous shrub Dorycnium rectum, are used for soil conservation in New Zealand and have potential value as browse plants. Two experiments were conducted in the lower North Island to ascertain the effect of selected establishment and cutting practices on their browse yield and nutritive value. A hill site experiment determined the effect of rooted and unrooted stem cuttings on establishment and initial production of the Salix species. A flat site experiment determined the effect of cutting height (0.10–0.30 m, 0.80 m, and 1.20 m above ground) and cutting frequency (once or twice per year) on yield of the Salix species and D. rectum. The establishment and dry matter (DM) yields of the Salix species were unaffected by the type of stem cutting. S. matsudana x alba (1.2 kg DM/tree) plants yielded more edible DM than S. kinuyanagi (0.9 kg DM/tree) and D. rectum (0.4 kg DM/tree). Cutting height had no effect on edible DM yield but affected total DM yield of the Salix species. Nitrogen concentration in edible DM, of all species, was 18–22 g/kg DM. In vitro organic matter digestibility of S. matsudana x alba (648–691 g/kg DM) and D. rectum (664–666 g/kg DM) was greater than S. kinuyanagi (611–615 g/kg DM). The condensed tannin concentration in edible DM of S. kinuyanagi was four-fold higher than in S. matsudana x alba (255 vs. 59 g/kg DM). It was concluded that S. matsudana x alba had the greatest potential as a browse species and D. rectum the least.This revised version was published online in November 2005 with corrections to the Cover Date.