共查询到19条相似文献，搜索用时 203 毫秒
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截干对迎春５号杨树造林成活率的影响张青正（黑龙江省迎春林业局）杨树造林后苗木能否成活，关键在于苗木水分的供需平衡。由于起苗时苗木的根系都不同程度地受到了损伤，致使根系从土壤中吸收水分的能力下降。造林后如果苗木根系不能保证苗木地上部分对水分最基本的需求... 相似文献
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苗木含水量与造林成活率关系的研究 总被引：3，自引：0，他引：3
造林后成活的关键在于苗木能否迅速生长出新的根系和恢复其生理功能。苗木的新根再生长及生理机能的恢复,主要决定于整个苗木,特别是根系生活力的大小。一般的说,影响苗木生活力的主导因子是水分。为了探讨苗木含水量对造林成活率的影响,我们于1985年和1986年,对辽宁东部主要造林树种苗木的不同含水量,进行了浸根、失水和造林等试验,以求探明成活率与苗木含水量的关系及苗木根系水分等情况,为在起苗、运苗、假植、造林等工序中,确定保护苗木措施提供依据。 相似文献
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通过对金沙江干热河谷上段乡土树种川楝1年生苗木进行5种晾晒处理试验,测定不同晾晒处理后根系的相对含水率、相对电导率、根系活力和移植后的成活率,分析探讨川楝苗木水分与苗木活力的关系.结果表明:川楝苗木活力与其苗木水分密切相关,在晾晒的过程中苗木失水使相对含水量下降,相对电导率增加,根系活力下降,最终导致苗木成活率降低和影响幼林生长情况.在川楝造林时,要做好起苗后的苗木保护工作,尤其是根系的保护,这对于维持苗木活力,提高造林成活率和保存率有重要的意义. 相似文献
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传统的造林用苗木,一般都在苗圃中露地培育。裸根栽植。容器育苗是在装有培养基质的各种容器中培育苗木,苗木根系在容器中形成,造林时带着完整的根团土栽入造林地。由于根系不受损伤,不被风吹日晒,栽植后无缓苗期,从而提高了造林成活率和造林后的初期生长量。对于自然条件比较恶劣的地区和某些栽植后较难成活的树 相似文献
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毛白杨的苗木质量随繁殖方法的不同而表现出很大的差异。一般认为,苗木是否具备完整、健壮的根系是衡量毛白杨苗木质量的重要标志之一。在相同的栽培技术和立地条件下,用根系发达的毛白杨苗造林,当年的高生长可以达到1-3米;但是,如果用根系发育不良的苗木造林,往往缓苗期很长,影响造林成果。 相似文献
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采用ECH2O含水量监测系统,对侧柏容器苗留袋、脱袋造林后容器水分动态及苗木生长及生物量进行监测。林地土壤平均含水量>脱袋造林>留袋造林。根系数量、根系分布、苗木生长状况、标准株生物量脱袋造林均优于留袋造林。大规格移植容器苗造林时,在确保苗木根团完整的情况下,以采用脱袋造林栽植方式为好。 相似文献
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马尾松不同处理苗木造林初期效果分析 总被引：1，自引：0，他引：1
从马尾松不同处理苗木造林3年生调查分析表明,马尾松截根移栽或切根裸根苗造林效果最好,根系发达,可提高造林成活率和幼林生长,且造林成本适中,而常规裸根苗造林效果差。 相似文献
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闽粤栲在紫色土林地生长的调查研究 总被引：6，自引：1，他引：5
对紫色土林地栽培的闽粤栲林分生长量、生物量、林分生长过程、空间分布等进行了分析研究。结果表明 :1 5年生闽粤栲平均胸径、平均树高、林分立木材积分别为 1 8 5cm、1 2 1m和 1 0 9 72 5 0m3 ·hm-2 ,生长量较高 ,是较好的速生用材造林树种。同时闽粤栲在紫色土林地还表现出 :侧根发达 ,分布较浅 ,根量减少 ,板根明显的特点 ,与红壤林地根系存在差异 ,说明其根系有较强的适应性 相似文献
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《Scandinavian Journal of Forest Research》2012,27(5):400-408
Plant biomass, root colonization by ectomycorrhizal (ECM) fungi and root peroxidase (POD) activity were monitored in Scots pine (Pinus sylvestris L.) nursery seedlings during the first growing season after planting (after 4, 8 and 16 weeks, in July, August and October, respectively) in forest humus in outdoor open-top chambers with gaseous atmospheric pollutants (combinations of low levels of ozone, sulfur dioxide and nitrogen oxides). The number of ECM morphotypes as well as root biomass increased towards the end of the growing season, while root POD activity decreased. Fungal biomass estimated as ergosterol concentration peaked in August, 8 weeks after planting. The seedling growth, mycorrhizal status and POD activity in the roots were not affected by the gaseous pollutants. 相似文献
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闽楠扦插繁殖技术研究 总被引：1，自引：1，他引：1
通过正交试验设计研究不同年龄母株穗条、扦插基质、生根促进剂浓度、扦插时间对闽楠生根率及根生长的影响。结果表明:扦插基质、母株年龄、扦插时间对闽楠生根率及根生长影响显著,不同生根促进剂浓度对生根率及根生长无显著影响;各因素的最佳组合为:1年生母株穗条经ABT1#800 mg.L-1速沾后扦插于砻糠灰中;3月份扦插生根率最高,达89.6%。 相似文献
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Root growth and hydraulic conductivity of southern pine seedlings in response to soil temperature and water availability after planting 总被引：1，自引：0，他引：1
Comparison of the root system growth and water transport of southern pine species after planting in different root-zone environments is needed to guide decisions regarding when, and what species to plant. Evaluation of how seed source affects root system responses to soil conditions will allow seed sources to be matched to planting conditions. The root growth and hydraulic conductivity of three sources each of shortleaf, loblolly and longleaf pine seedlings were evaluated for 28 days in a seedling growth system that simulated the planting environment. Across species, an increase in root-zone temperature alleviated limitations to root growth caused by water stress. In the coldest temperature, longleaf pine maintained a higher hydraulic conductivity compared to shortleaf and loblolly pine. Without water limitation, the root growth and hydraulic conductivity of shortleaf and loblolly pine were superior to that of longleaf pine, but as water availability decreased, the root growth of longleaf pine surpassed that of loblolly pine. Hydraulic conductivities of the seed sources differed, and differences were attributed to either new root growth, or an increase in the efficiency of the root system to transport water. 相似文献
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The value of initial stem diameter near the root collar, shoot length and number of first-order lateral roots (FOLR) as morphological indicators of stock quality and field performance was examined for bareroot (1+0, undercut) red oak (Quercus rubra L.) underplanted in a shelterwood in central Ontario. These three attributes were measured on more than 400 seedlings prior to planting, and their relationship with height and basal diameter growth two years after planting was determined using correlation and regression analysis. Initial diameter, shoot length and number of FOLR were positively and significantly correlated with second-year height and diameter. These relationships were strongest for diameter, but this variable explained less than 25% of the total variation in growth. Of the three indicators, diameter was also the best predictor of several physical characteristics of root systems two years after planting. Initial diameter was significantly correlated with root volume, root area and lateral root, taproot and total root dry mass. Weaker relationships existed between initial shoot length and number of FOLR and second-year root system features. Stem diameter two years after planting was more strongly related to root volume, area and dry mass than was initial diameter, the probable result of adjustment in root-shoot balance of planting stock to the shelterwood environment. 相似文献
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该文报道了薄壳山核桃大田播种育苗和火箭盆、无纺布、塑料钵容器等育苗方式对苗木生长及根系结构的影响。结果表明:不同育苗方式对薄壳山核桃苗木高度和地径生长影响显著,其中火箭盆容器培育的苗高、地径生长量最大,为39.14 cm和0.96 cm;无纺布容器苗和大田播种苗次之;塑料钵容器苗的苗高、地径生长量最小。多重比较分析表明,不同育苗方式对薄壳山核桃苗木的主根长度、主根直径、1级侧根数、1级侧根平均长度、根鲜质量、根干质量、茎鲜质量、茎干质量、根茎鲜质量比和根茎干质量比等指标影响显著,火箭盆容器和无纺布容器培育的苗木侧根系发达,根系质量好;而大田播种苗和普通塑料容器苗的主根发达,侧根少,根系质量较差。 相似文献
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利用福建省南平樟湖国有林场不同类型和规格的木荷苗木造林对比试验林,系统研究苗木类型与规格对造林成活率、保存率、幼林生长及叉干率的影响。结果表明:轻基质营养袋苗、大田裸根Ⅰ级苗和大田裸根Ⅱ级苗3种类型和规格的木荷苗木造林成效差异显著,其中采用轻基质营养袋苗造林可取得95.56%的造林保存率,且叉干率只有3.47%;造林后木荷1年生幼苗地径、树高和冠幅的平均值分别达到了1.63cm、107.10cm和56.43cm;造林后2年生,其地径、树高和冠幅的平均值分别达到了2.61cm、224.90cm和113.07cm,均优于大田裸根Ⅱ级苗和大田裸根Ⅰ级苗的造林成效,说明采用木荷轻基质营养袋苗造林可显著提高造林成活率和生长量,降低林木叉干率,全面提升造林成效。 相似文献
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旱坡地枣树密植园密度与根系关系的研究 总被引：7，自引：1，他引：6
枣树的地上部分与根系的关系的相互依存，彼此制约的辩证统一关系，密度与根系关系就是从密度影响二者的矛盾中体现的，枣权索性密植园，栽植密度显著地影响着根系的生长发育，幼树期，密度从栽植后第２年或第３年起便开始制约枣树的生长发育，首先表现在根系对土壤有限养分水分的竞争上，到８年生时，不同密度植株根系在坡面上和水平沟内的分布数量和大小是不相同的，根的分布趋势是，粗大根随着密度的增加逐渐减少。 相似文献
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Importance of root growth in overcoming planting stress 总被引：6，自引：2，他引：6
Steven C. Grossnickle 《New Forests》2005,30(2-3):273-294
Root growth is critical to the establishment of planted seedlings. Seedlings can undergo stress just after planting if root growth is not sufficient to couple the seedling to available soil water. Stress occurs when a newly planted seedling’s root system can not supply enough water to transpiring needles to maintain a proper water balance and ensure survival. Thus, a newly planted seedling’s ability to overcome planting stress is affected by its root system size and distribution, root–soil contact, and root hydraulic conductivity. This paper describes how factors of root growth and water status of newly planted seedlings are important in overcoming the phenomenon of planting stress which then allows a newly planted seedling to enter the establishment phase of development. 相似文献