共查询到19条相似文献，搜索用时 234 毫秒
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《林业实用技术》2015,(11)
采用不同贮藏方法、催芽处理进行丝栗栲(Castanopsis fargesii)种子发芽试验,并对11个地理种源的丝栗栲种子进行种子千粒质量、含水量检验和发芽试验,探讨丝栗栲种子催芽、贮藏技术及发芽率与种子千粒质量、含水量的相关性。结果表明:(1)沙藏可最大限度的保持丝栗栲种子活性,越冬后种子发芽率与新鲜种子相比,发芽率仅下降1.2%,但种子发芽周期比新鲜种子增长了将近一周。(2)用冷水浸泡24h丝栗栲种子发芽率达95.0%,比未催芽处理提高5.0%,还可缩短种子发芽周期将近3~4d。(3)丝栗栲种子的发芽率与含水量存在着显著的正相关关系,含水量是影响丝栗栲种子发芽率的主要因素之一,在贮种选种中,含水量的控制十分关键。本研究解决了丝栗栲种子越冬贮藏、催芽处理等关键技术,可为丝栗栲育苗提供理论指导和技术参考。 相似文献
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马尾松条播切根育苗研究 总被引：1，自引：0，他引：1
马尾松属深根性用材树种,常规育苗情况下,苗木主根发达,侧根稀少,裸根苗上山造林成活率低。采用切根育苗技术,在8月初切断主根,抑制主根生长,可控制苗木主根徒长和苗木高生长,防止松苗秋天抽梢,促进侧根与须根生物量成倍增加,提高苗木质量和造林成活率。 相似文献
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马尾松切根、菌根化容器育苗效果的试验 总被引：5，自引：0，他引：5
对马尾松切根、菌根化容器育苗效果的试验表明：催芽切根的苗木的主根和高生长受到一定抑制，但地径生长、侧根发育及须根数量均有显著改善，并且避免了畸形根系的产生，从而提高了容器苗的规格质量；切根茵根化的苗木高、径生长和生物量积累均优于切根未接种菌根的苗木，幼苗造林成活串和幼林生长发育状况也明显比对照要好。 相似文献
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对福建永春牛姆林自然保护区内22a生的闽粤栲(Castanopsis fissa)、丝栗栲(Castanopsis fargesii)、拉氏栲(Castanopsis lamonteii)不同器官的灰分含量、去灰分热值和碳含量进行对比分析,并估算各树种人工林的碳储量和能量现存量。结果表明:3种栲属树种各器官灰分含量总体表现为叶根枝干,各器官平均灰分含量则表现为拉氏栲丝栗栲闽粤栲;各树种各器官去灰分热值总体表现为叶枝干根,各器官平均去灰分热值则表现为拉氏栲闽粤栲丝栗栲;各树种各器官碳含量均表现为干枝根叶,各器官平均碳含量则表现为闽粤栲丝栗栲拉氏栲;各树种各器官间的灰分含量、去灰分热值和碳含量总体差异均达到显著水平(t检验,P0.01);除了碳含量与去灰分热值呈极显著正相关外,其他各指标间无显著相关性;3种栲属树种人工林碳储量和能量现存量表现为为闽粤栲丝栗栲拉氏栲,在低产低效林分改造中可优先考虑闽粤栲。 相似文献
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马尾松播种苗截根提高造林成活率研究 总被引：2，自引：0，他引：2
秋季造林前于８月中下旬对马尾松当年生播种苗进行截根处理，截根后主根变短，促进了须根生长，使侧根，须根量增加，吸收营养的面积增大，地下与土上部分生长趋于平衡，提高了苗木质量及造林成活率。 相似文献
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高质量丝栗栲基因组DNA的提取方法 总被引：1，自引：0，他引：1
为了促进丝栗栲分子生物学的研究,采用尿素法、柠檬酸钠法、改良CTAB法和SDS法4种方法提取丝栗栲叶片基因组DNA,并对提取效果进行了比较和分析。结果表明,改良CTAB法较适合丝栗栲基因组DNA提取,其提取的DNA产率高,凝胶检测条带整齐清晰,杂质少、无明显降解,OD260/OD280比值在1.8左右;而尿素法难以提取基因组DNA,SDS法提取的DNA得率较低,柠檬酸钠法有蛋白质、多糖等杂质污染均不太适用丝栗栲基因组DNA提取。采用改良CTAB法提取得到丝栗栲幼叶、老叶、嫩芽和幼茎基因组DNA,产率分别为177.3、167.1、242.0和156.7μg/g。酶切分析也证明,改良CTAB法提取的不同组织DNA适用于进行后续分子生物学研究。 相似文献
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The effect of cutting the tap root on shoot growth and development of lateral roots was observed in seedling Quercus robur L. growing in PVC tubes containing peat and perlite. Cutting the tap root had little effect on shoot height and leaf number although some treatments caused a significant but slight reduction in shoot dry weight and number of branches. Total root dry weight was similar in control and treated plants but distributed differently between the types of root present. The tap root always formed the largest part of the total root dry weight. In control plants most lateral root dry weight was in roots < 1 mm diameter whereas in treated plants most dry weight was in roots > 1 mm diameter. Development of the root system following root cutting was similar for all treatments: new long laterals > 1 mm diameter with relatively few branches, that formed replacement tap roots, developed near the cut end of the original tap root. Fine laterals (< 1 mm diameter) near the root collar continued to grow forming highly branched systems. 相似文献
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为了提高黧蒴栲苗木质量和造林成活率,利用随机区组设计开展了黧蒴栲芽苗截根移栽、截根苗造林对比试验.结果表明：黧蒴栲芽苗截根处理对苗高、主根长、一级侧根数、叶干重、茎枝干重、根器官干重有极显著影响,对苗木地径、一级侧根长度有显著影响.芽苗截根处理后苗木高度增加17.51％、地径增加13.72％.不同剪叶处理方式对黧蒴栲苗木造林成活率有极显著影响,芽苗截根苗造林以剪叶75％效果最好,造林成活率达95.86％,而未剪叶苗造林成活率为57.69％;应用芽苗截根苗造林可提高造林成活率17.0％～24.0％,增加当年树高、地径生长量分别为18.22％、15.44％. 相似文献
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Stem cuttings of Eucalyptus globulus are used within tree improvement programs and for mass deployment. To be successful, cuttings must perform as well or better than seedlings. The root systems of cuttings are fundamentally different from those of seedlings. If these differences influence growth, the differences and their consequences must be identified and the propagation system manipulated to improve performance of the propagules.Cuttings are only a viable alternative to seedlings as planting stock if the method of propagation does not affect their growth and development adversely. Full-sibling cuttings and seedlings of Eucalyptus globulus were compared under controlled environmental conditions to minimise extraneous sources of variation, and to establish whether changes in growth or development were induced by propagation. On three occasions over a period of eight weeks root-collar diameter, shoot height, leaf and stem weight, shoot/root ratios and root system morphology were measured on cuttings and seedlings. Seedlings were taller than cuttings throughout the experiment, but both plant types had similar height growth rates. Diameter growth rates were lower in cuttings than seedlings, and there were differences in both height and diameter growth rates between families. Root system configuration differed between the plant types. Seedlings had strongly gravitropic tap-roots, with two types of primary roots from which secondary roots emerged. Cuttings had no tap roots, and the main structural components of their root systems were adventitious roots formed during propagation. Cuttings did not develop further structural roots during the experiment, whereas seedlings continued to develop primary roots. Individual primary roots of cuttings were longer and had larger mid-point diameters than those of seedlings, but the total length of primary roots was greater in seedlings. Seedlings also had a greater number and total length of secondary roots. Shoot/root ratios, calculated from a range of functional measures, were higher in cuttings than seedlings. 相似文献
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在云南西双版纳州勐海县的中心苗圃开展了黄樟的切根移袋育苗,与苗床常规育苗的对比试验。试验结果表明:通过切根移袋育苗提高了黄樟苗木的质量,苗木高径比差异缩小,促进了其苗高和地径的协调生长。通过切去黄樟苗木部分主根,极显著缩短了黄樟苗木主根的长度(59.675%),促进了苗木侧根的生长,显著提高了苗木的Ⅰ级侧根数(161.905%)和苗木地下部分的鲜重(195.288%),增加了苗木对土壤养分的吸收能力,从而显著地促进苗木的地径生长(22.051%)和地上部分鲜重的增加(42.887%)。其苗高比常规苗床育苗(对照)提高了10.475%、Ⅰ级侧根长比对照降低了12.614%。 相似文献
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桐棉马尾松芽苗截根移栽试验 总被引：3，自引：0，他引：3
应用ＬＯＴＵＳ１－２－３图表分析集成软件，对芽苗不同截根移栽处理与对照进行比较分析。结果表明：芽苗截根移栽后，能有效地抑制主根生长，促进侧根生长发育，且高径比下降２３．４％，Ｔ－Ｒ率下降２２．３％，苗木全株干重增加５１．１％；截根能使苗期的地上与地下部分生长趋于协调，图示聚类分析还表明，截根处理以保留根毛区约２／４－３／４根长为宜。 相似文献
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化学调控剂在巨尾桉组培苗嫩梢扦插育苗上的应用结果表明,化学调控剂能明显延缓或抑制巨尾桉扦插苗高生长,促进地茎生长,在抑制主根生长的同时强烈促进侧根生长。施用1.0 g.m-2的化学调控剂60 d内高生长仅增加3 cm,地茎增长0.12 cm,生根条数达20~30条,出圃率达95%;而不施药的苗木60 d内高生长增加17.6 cm,地茎增长0.05 cm,生根条数仅8~12条,出圃率只有85%。应用化学调控剂能提高苗木质量和产量,起到了贮存苗木作用,使用方法简便,成本低,效果好。 相似文献
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Two-year seedlings of Quercus robur (pedunculateoak) were root-pruned before transplanting in order toevaluate the importance of coarse versus fine roots onregrowth. Root systems were pruned by leaving c. 19,13 or 7 cm root from the root collar. Alternatively,coarse roots (>2 mm in diameter) were removed, leaving only the taproot and the fine roots (<2 mm)attached, or fine roots were removed from coarse rootsand taproot. Growth of shoots and roots after onegrowing season was compared to an unpruned controlunder standard nursery conditions. Seedlings rootpruned to 19, 13 or 7 cm were further tested undercompetition achieved by transplanting into a mixtureof clover and grass. Pruning of the root systemsignificantly reduced regrowth in terms of total plantDW in accordance with the severity of pruning, shootDW being more affected than root DW. Removal of coarseroots depressed final root DW whereas removal of fineroots reduced shoot DW and hence root:shoot ratioincreased. The study suggests that fine and coarseroots have different roles in root:shoot allocation.The competition test increased root:shoot ratioindicating that competition induced seedlings toallocate more of their resources into growth of theroot system. 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