凝胶水泥封闭法防治核桃枝干类病害新技术

文章介绍了核桃枝干病害造成的损失及其病害特点;阐述了凝胶水泥封闭法防治核桃枝干病害的技术方法;对该方法的技术成熟度和推广应用前景作了论述。     

略论花椒采摘后的管理技术

对花椒的采摘后管理技术作了详细论述,详细介绍了常见花椒病虫害的防治,对其采后的合理修剪技术包括盛椒期修剪,老树修剪等技术进行了论述,最后介绍了深翻培土和施肥等土肥水管理技术。     

略论花椒采摘后的管理技术

对花椒的采摘后管理技术作了详细论述,详细介绍了常见花椒病虫害的防治,对其采后的合理修剪技术包括盛椒期修剪,老树修剪等技术进行了论述,最后介绍了深翻培土和施肥等土肥水管理技术.     

苗圃地的耕作

文章对苗圃地整地、作床与作垄、土壤处理、轮作等苗圃地耕作的主要施工项目进行了论述和说明,针对生产实践中苗圃地的具体用途进行了技术设计。     

浅谈黄河三角洲盐碱地绿化施工技术

介绍了黄河三角洲盐碱地绿化的施工技术,重点论述了盐碱地土壤的改良方法、耐盐碱植物的栽植,并对盐碱地的绿化灌溉技术作了阐述,提出了具有建设性的意见。     

森林病虫害遥感监测研究的现状与展望

论述了森林病虫害遥感监测技术研究现状、内容及技术方法,并对今后遥感技术在森林病虫害监测上的应用前景作了展望.     

森林病虫害遥感监测研究的现状与展望

论述了森林病虫害遥感监测技术研究现状、内容及技术方法,并对今后遥感技术在森林病虫害监测上的应用前景作了展望。     

秦巴山区枇杷容器苗繁育技术

本文结合实践,就秦巴山区枇杷容器苗繁育技术从容器选择、营养土配制装填;砧木苗、良种嫁接苗培育等方面,作了较详细论述,供枇杷生产经营者参考。     

结合GIS的遥感专题地图编制与应用

探讨了如何利用地理信息系统技术和遥感技术编制遥感专题地图的技术方法和过程,并对遥感图像处理、地图数字化、图像几何精校正和遥感专题地图的应用等问题作了详细论述。     

基于GIS的森林资源档案数据更新方法

采用基于GIS等先进技术的森林资源档案,数据更新才能及时反映森林资源动态变化.对森林资源档案不同类型数据的更新方法作了论述.对数据更新的流程作了说明.     

半枫荷塑料大棚内嫁接快速育苗技术研究

对半枫荷塑料大棚内嫁接育苗试验的结果表明,当年用休眠芽嫁接,翌年6月嫁接成活率可达95.07%,平均接穗高67.33 cm,平均接穗茎粗0.54 cm。砧木以3年生半枫荷I级侧枝为好,嫁接成活率、生长量、保存率由高到低排序为容器苗>移植苗>留床苗,砧木切干高度对成活率和生长量无影响。     

Ultrastructural aberrations referring to viruses in the needles of young growth disturbed pine seedlings

Ultrastructural abnormalities in phloem albuminous cells of needles of young pine seedlings from two Finnish nurseries suffering from the growth disturbances of conifer seedlings were studied. Needle samples were taken from growth disturbed seedlings and from healthy looking nursery seedlings as well as from naturally born forest seedlings. The results are discussed in relation to the possibility of virus disease in growth disturbed seedlings. The first trials to observe the viruslike particles from abnormal seedlings will be discussed, too.     

落叶松播种苗使用钼酸铵根外追肥试验报告

通过对落叶松播种苗根外追施钼酸铵液，促进苗高，地径生长，较明显地提高了苗木整体质量，对苗木木质化和提高苗木对不良环境的抵抗力有着积极的促进作用。     

4种行道树中苗与大苗定植后生长比较

对广东省东莞市丘陵片中心区盆架子、小叶榕、秋枫和桃花心木4种行道树中苗和大苗的8 a生长表现进行比较,4个树种的中苗胸径增长量均极显著大于大苗。生长表现及种植成本等综合比较结果表明,行道树种植采用中苗的做法是科学可行的。建议行道树种植不用或少用成本高、生长慢的大苗,多用中苗。     

Temporal allocation of (14)C to extramatrical hyphae of ectomycorrhizal ponderosa pine seedlings

Ponderosa pine seedlings were inoculated with Hebeloma crustuliniforme either in growth pouches before they were transplanted to root-mycocosms (P seedlings), or at the time of transfer to root-mycocosms (V seedlings). Uninoculated seedlings served as controls (U seedlings). The use of root-mycocosms allowed examination of portions of hyphae separate from roots and rooting substrate but still in symbiosis with the host. The results thus provided a quantitative basis for estimating hyphal mass and carbon allocation to extramatrical hyphae. The amount of (14)CO(2) fixed after a 2-h exposure was greatest for P seedlings and least for uninoculated seedlings. Four and nine days after exposure, (14)C content was greatest in uninoculated seedlings and least in inoculated seedlings. In isotope distribution and dry mass accumulation, V seedlings were more similar to U than to P seedlings. Calculated on a dry weight basis, the allocation of isotope to mycelium suggested that extramatrical hyphae of P seedlings were a stronger sink for carbon than extramatrical hyphae of V seedlings. Differences in inoculation methods resulted in differences in carbon allocation and physiology of extramatrical hyphae that could affect seedling establishment and survival. Seedlings inoculated by one method cannot serve as surrogates for mycorrhizal seedlings produced by other inoculation techniques.     

建始县日本落叶松苗木分类造林试验研究

为了保证日本落叶松造林后林相整齐,减少苗木分化,提高林分质量,确保尽快郁闭成林。2009～2011年间,开展了苗木分类造林对比试验。结果表明:无论用哪个类别的苗木造林其成活率和保存率没有太大区别;造林后连续3 a地径、树高新生长依次为:1 a生超级苗>2a生Ⅰ级苗>2 a生混合苗>2 a生Ⅱ级苗。造林时,一定将苗木进行分类,在2 a生Ⅰ级苗用完后,可采用1a生超级苗造林,不提倡混合苗造林。     

组织培养对草莓微繁殖苗植物学性状的影响

为揭示组培因子对草莓微繁殖苗植物学性状的影响,以草莓品种"丰香"为试材,研究了组培因子导致草莓微繁殖苗植物学性状的表现变化。结果表明:在生长季的大部分时间里,草莓微繁殖苗的株高、叶柄长和冠径,均比普通苗要小。在果实成熟期后,普通苗株高呈明显下降趋势。草莓微繁殖苗整个生长期中的4个主要物候期要比普通苗早2～3 d。而茎尖分化出的微繁殖苗的叶面积和植株冠径都要大于不定芽分化出的微繁殖苗。叶片再生植株移栽后的生长情况因不同品种而异。再生植株的生长势较差,在叶面积、叶柄长、株高和植株冠径上,都要低于正常继代培养的微繁殖苗。继代次数不同的微繁殖苗移栽到温室后,在植物学性状上表现出差异,表现为:继代8次的微繁殖苗>继代6次>继代10次>继代4次。这说明草莓的继代次数要限制在10以下才能满足生产上的要求,一般继代次数以5～10次为宜。     

Influence of water stress on the physiology and growth of red spruce seedlings

Two-year-old, container-grown red spruce (Picea rubens Sarg.) seedlings from a New Hampshire seed source were exposed to 10 or 11 drying cycles in which the seedlings were not watered until their midday (1400 h) xylem water potentials averaged -1.57 MPa. Control seedlings were kept well watered to maintain midday water potentials of about -0.73 MPa. After the final drying cycle, the water-stressed seedlings were rehydrated and osmotic potentials were determined by pressure-volume analysis. Gas exchange at ambient CO(2) concentration (338 ppm) and at an elevated CO(2) concentration (838 ppm) was measured on both groups of plants as they slowly dried down. No osmotic adjustment or photosynthetic acclimation occurred as a result of the water-stress treatment and both groups of seedlings maintained photosynthesis to water potentials as low as -3.0 MPa. Twenty-four hours after rehydration, the water-stressed seedlings had photosynthetic rates as high as the control seedlings. Estimated stomatal limitation to photosynthesis was approximately 30% down to water potentials of -1.4 MPa, but increased steadily as water potentials decreased further. At ambient CO(2) concentrations (338 ppm) and water potentials averaging -2.45 MPa, photosynthetic rates of water-stressed seedlings were 15% those of well-watered seedlings, whereas when the same water-stressed seedlings were measured in the presence of an elevated concentration of CO(2) (838 ppm) their photosynthetic rates were 73% those of well-watered seedlings measured at an ambient CO(2) concentration (338 ppm).     

文冠果育苗技术试验研究

本文通过混沙埋藏催芽、温水浸种催芽、快速催芽法三种方法对文冠果种子进行了催芽试验。结果表明文冠果种子催芽中,采用混沙埋藏催芽法,出苗率能达100%,在生长过程中,苗高和地径都显著优于其他催芽方式。容器育苗和插根育苗在苗高和地径方面优于播种育苗。     

Early season short-day treatment did not affect the field performance of Pinus sylvestris container seedlings in summer planting

Abstract

When Scots pine (Pinus sylvestris L.) seedlings are short-day (SD) treated in May or early June, height growth ceases but seedlings reflush within a few weeks and grow secondary needles (later referred to as early SD treatment). These “2-year-old-like” seedlings have been thought to be more stress tolerant than traditional 1-year-old pine seedlings, and thus suitable for summer and autumn plantings. To test this, seedlings sown in April were early SD treated over a 3-week period from the beginning of June and the seedlings were planted at 10-day intervals from the beginning of July until the end of September, and also during the following spring. Neither survival nor height growth of early SD-treated seedlings differed from untreated (1-year-old) seedlings. Moreover, for both early SD-treated seedlings and 1-year-old seedlings, those planted in summer grew and survived better after planting but had more multiple leaders than seedlings planted in autumn or spring.