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火炬松嫁接不亲和性调查 总被引:3,自引:1,他引:2
文章通过对英德火炬松种子园的1~5年生的251个嫁接无性系,780个分株作嫁接不亲和性调查,结果有24.7%的无性系,7.3%的分株出现嫁接不亲和性;概述了不亲和性接株的生长情况和形态特征;将不亲和株初步分为4种类型,并提出一些克服嫁接不亲和的方法。 相似文献
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枫杨作砧快速营建核桃良种采穗圃技术研究 总被引:3,自引:0,他引:3
以枫杨为砧,对核桃进行了嫁接时期、嫁接方法、接穗处理等试验研究,其高改嫁接703株,株成活率达95.2%,接穗成活率达70.9%。当年亩产接穗比以核桃为砧改接核桃采穗圃产量高2.16-3.48倍,具有成本低、见效快、质量好的特点。94年已通过省级成果鉴定。 相似文献
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选用优良板栗新品系-2次结实板栗对5年生低产栗园进行多头高接改造,采取造时抹芽摘心,病虫防治,深翻改土,合理修剪等综合技术措施,其嫁接茬成活率达100%,接穗成活率达96%,高接换种后栗园,当年改接当年挂果,每公顷产量第1年达206.25kg,第2年则高达981kg,是原栗园(末改接)的5.1倍,且2次坚果商品价值均较高,经济效益显著。 相似文献
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用当年育秧移栽的实生苗为砧木,在10月3日~13日进行就地单芽嫁接.嫁接的气温28~18℃之同.当年12月30日检查,接口愈合且接芽饱满的达96%,第2年5月20日检查,抽芽率88.2%. 相似文献
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我国城市林业研究进展 总被引:3,自引:0,他引:3
城市林业是近10年才在我国兴起的一门边沿学科。文章从我国对城市林业的理论认识、城市林业的实践和城市林业的专题研究三个方面概述了城市林业研究的进展,并提出近中期需要有所突破的几个方面。 相似文献
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均匀设计法在植物组织培养外植体消毒中的应用 总被引:2,自引:0,他引:2
以2年生刺槐插根苗的叶柄为材,采用均匀设计及其分析方法,以84消毒液为消毒剂,进行外植体消毒试验,得出最佳消毒处理组合为:消毒液有效浓度0.3%,时间4.07min。 相似文献
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良好的生态是自然和谐的保证,有了对自然的保护之心,人与自然之间也就形成了一种欢愉的和谐状态。本期我们特别刊发浙江省武义县白鹭休闲飞舞的摄影作品,以唤起人们心中对自然的情感。 相似文献
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The development of board and pulp manufacture is discussed inthe light of the country's dependence on imports of timber andtimber products. The development of board and pulp projectsis traced up to the present time, and the individual requirementsare briefly examined. The effects of the country's forestryprogramme, of consumption trends in industry, and of trendsin the main exporting countries on the possible future courseof home development are discussed. The conclusion is reachedthat while expansion is likely in both board and pulp manufacture,pulp development may claim greater attention in spite of itsmore formidable problems. Emphasis is placed on the need forcareful planning in the development of the board and pulp industrie.s 相似文献
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- Soil temperature measurements in a forestry plantation at Birkhall,near Ballater, Aberdeenshire, have been maintained from January1952 onwards, and the present paper extends the results alreadypublished (Quart. J. Roy. Met. Soc. lxxxi (1955), 72) with regardto soil temperature profiles, frost occurrence, and the efficiencyof daily maxima and minima of temperature in the estimationof mean weekly temperatures.
- Results are given for the interceptionof rain by vegetationalcovers of various types and for thedifferences in moisturestatus that occur between soils in anopen ride and under theforest canopy.
- The amplitudes of diurnaltemperature fluctuations in the rideand under the forest canopyhave been compared. Over the periodAugust 1954 to December1956, the latter average about 60 percent, of the former; thereare, however, large differences betweenthe results for thedry conditions in 1955 and the wet conditionsin the later monthsof 1956, and consideration is given to thefactors contributingto these differences.
- The mean temperatures in the ride arehigher than those underthe canopy between April and September;the greatest differences,which are of the order of 1? C., occurin the later part ofthe spring and the earlier part of thewinter.