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通过对西南桦采穗圃4种不同母株定植密度和不同截干高度与母株产穗量的相关分析,研究了西南桦不同种源家系对母株产穗量的影响。结果表明:不同母株定植密度和母株截干高度对西南桦穗条的生产量影响差异显著。7个种源最优家系最优单株中,以G12及M16产穗量最高。 相似文献
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经过2年来对野牡丹采穗圃的建立和管理及穗条的不同药剂浓度、不同扦插时间、穗条所处不同部位、不同的修剪方式试验研究,结果表明:(1)苗圃中选择的优树建立的采穗圃当年每株母树采穗量达18条~54条,丛生性母株留低桩1 cm~2 cm采穗量最大,达到54条/株;(2)穗条用200 mg.L-1GGR6生根粉处理后的扦插效果最好,生根率达到88.5%,清水处理的穗条扦插效果最差,生根率为68.5%;10月中旬是扦插野牡丹的最佳时间,成活率可达90.5%;枝条上部的穗条扦插成活率最高,可达91.5%;穗条的不同修剪方式对扦插成活率影响不明显,平均成活率80.4%。 相似文献
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以普通油茶作砧木和接穗进行大树嫁接换冠,研究不同嫁接条件对油茶接穗成活及生长的影响。结果表明:砧木年龄、嫁接时期、接穗保存时间对接穗成活有显著影响,断砧高度对接穗成活没有显著影响;砧木年龄、断砧高度、嫁接时期对接穗新梢长度有显著影响,接穗保存时间在接穗成活后对新梢长度没有显著影响。选择20 a砧木+25~50 cm断砧高度+6月上旬+采穗当天嫁接,最有利于提高油茶的嫁接成活率和新梢长度。 相似文献
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用马尾松19个家系1年生苗及18个家系3年生苗为母株建立采穗圃,采集半木质化插条在人工气候室的条件下扦插试验,研究生根率、每穗生根数、最长根长、平均根长、当年插条苗高的家系间变异程度,生根性状间的表型相关,遗传力等。结果表明,各生根性状在家系间存在显著差异,且受较强的遗传控制。根系效果指数是评价马尾松插条生根能力的较理想综合指标,但从不同生根性状的相关性分析结果来看,用生根率性状更简便直观。在家系选择基础上建采穗圃,可明显提高马尾松扦插繁殖能力。从种子园优良家系中筛选出生根率高的优良家系建立采穗圃,是马尾松扦插繁殖应用的有效途径。 相似文献
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Since 1986 a novel type of shoot orchard has been under development. Lower portions of the donor stems are buried horizontally in the soil and cuttings are taken from shoots that arise from them. This process apparently rejuvenates, so that mature trees of various ages can be propagated vegetatively. Seedlings of superior provenances, open-pollinated, and control-pollinated families, stump sprouts and upper branches of plus trees were used to establish the orchard, which contains about 40,000 donors and occupies 1.3 ha. Cuttings produced in this orchard can be rooted to about 85% success without hormones or shading. This shoot orchard provides more planting stock, and provides it five to six years earlier, than a seed orchard. The height and root-collar diameter of the rooted cuttings are greater than those of seedlings at outplant, and production costs are 15–20% lower than those associated with seedling production. Test plantations demonstrated that four-year height and diameter of cuttings and genetically similar seedlings are equivalent. This paper reports the details of this orchard, and summarizes other work on propagation and storage of Chinese fir cuttings. 相似文献
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对马尾松进行扦插繁殖试验,结果表明,采取剪除1~2年生母株的全部当年生新梢促萌,主梢可提高繁殖系数20倍以上,侧枝提高4倍以上;用吲哚丁酸和自配混合促根水溶液处理插穗,可使1年生母株穗条扦插成活率由40%提高到80%以上,多年生母株穗条扦插成活率由20%提高到60%以上。并表现出明显的年龄效应。扦插苗的地径明显大于同级实生苗。其全株重量、根重和根长亦显著增大。同时受母株遗传性所制约。说明其具有较大的无性系选育潜力。 相似文献
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Stephen Syampungani Mulualem Tigabu Nalukui Matakala Ferdinand Handavu Per Christer Oden 《林业研究》2017,28(3):549-556
The miombo woodland is one of the most extensive woodlands in Africa, supporting livelihoods based on biomass fuel for millions of rural people. However, there are growing concerns about the sustainability of harvesting for biomass fuel(mainly charcoal). Thus, the aim of this study was to examine whether regeneration by coppice is a viable option for sustainably managing miombo woodlands for biomass fuel production. We tested the hypotheses that(1) species, stump diameter, stump height and time since cutting significantly affect the number of sprouts per cut stump(coppice density) and mean sprout height(shoot vigour) and(2) higher coppice density reduces shoot vigour due to competition among coppice shoots in a given stump. In an inventory in areas that were harvested for charcoal production by the local people, 369 stumps of 11 species were recorded with mean coppice stumps ranged from 6 to 84. The mean coppice density ranged from 5 to 8 shoots per stump while the mean height of coppice shoots ranged from 46 to 118 cm with marked interspecific variations. Stump size was significantly and positively correlated with coppice density for some of the species, but not with shoot vigour for the majority of the species. However, shoot vigour was significantly positively correlated to time since cutting of trees for nearly half of the species. Coppice density had a significant negative correlation with shoot vigour for two species, and a positive correlation for one species. In conclusion, the results provide evidence about the importance of coppice management as a win–win strategy for sustaining charcoal-based rural livelihoods and recovering the miombo woodland ecosystem. 相似文献
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邱进清 《中南林业科技大学学报(自然科学版)》1998,(2)
对杉木无性系扦插繁殖的生根及生长能力与扦插基质、原株年龄、采穗部位、穗条长度、扦插深度和时间等相关因素进行研究,结果表明,在不同杉木无性系之间,扦插生根及生长能力存在极显著差异.扦插基质、原株年龄、采穗部位和穗长、扦插深度和时间,对杉木扦插成活有显著或极显著的影响:①蛭石插床有利于插穗生根,但苗高生长以混合土为基质的插床为好;②无性系的生根能力、苗高和根径的生长量与原株年龄的关系表现为1年生>3~5年生>15~20年生;③根径处插穗的生根率、侧根生长量及苗高,分别比苗高1/3处的插穗大11.8%~18.6%,3.4%~9.8%和14.7%~25.7%;④穗长以10~12cm为宜,扦插深度为穗长1/2为好,扦插时间选择在12月份为佳. 相似文献
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平茬高度对沙枣萌条生长的影响 总被引:2,自引:0,他引:2
沙枣(Elaeagnus angustifolia L.)作为有重要价值的燃料能源林树种,平茬是其利用的主要途径。研究了沙枣距地面0cm、5cm、10cm^3种高度平茬后的年生长变化及萌条的数量与质量。结果表明,沙枣丛高7、8、9三个月生长最快,3种平茬处理下丛高年生长量分别为147.84、145.88、136.04cm,极显著大于未平茬丛高年生长量。比较萌条的高径生长指标,发现距地面0cm平茬〉距地面5cm平茬〉距地面10cm平茬;而萌条总数:距地面10cm平茬〉距地面5cm平茬〉距地面0cm平茬。 相似文献