共查询到20条相似文献，搜索用时 468 毫秒
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详细总结了七叶树冬季播种育苗的母树选择、种子采集、种子处理、贮藏、整地、播种、覆膜及土、肥、水管理等技术。采取七叶树冬季播种育苗技术,减少了种子的贮藏时间,节约了贮藏成本,降低了因贮藏时间过长,可能出现的种子腐烂风险。通过对比试验,七叶树冬季播种育苗,种子发芽出土时间提前,缩短了种子发芽出土苗周期,提高了种子出苗率和苗木质量。 相似文献
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我局于一九七八年春开始,在影壁进行了落叶松等五个树种的塑料大棚容器育苗试验。试验表明,塑料大棚容器育苗能缩短育苗周期,加强苗木生长,是提高育苗、造林质量的有效途径之一。 相似文献
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采用秋季播种育苗方法,用地膜覆盖与稻草、麦秸覆盖对比试验.结果表明地膜覆盖连翘生育苗效果好,覆膜的比稻草、麦秸覆膜的提前出苗18d,出苗率高出16％,苗木高度、地径、根长分别高出16.2cm、0.18cm、9.2cm,覆膜苗质量明显高于稻草、麦秸覆盖苗,增产效果明显. 相似文献
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杏树常规育苗,是当年的种子经冬季层积处理,第二年春才能播种。我们用赤霉素处理鲜杏种解除休眠,对加速繁殖,缩短育苗周期,取得了明显的效果,在生产上具有一定的意义。 相似文献
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板栗一直采用直播和嫁接繁殖,周期长。经3年扦插试验,筛选出用嫩梢、嫩枝经激素处理后在地窖式温棚中育苗的方法,生根率可达65%。该方法育苗既节约了种子又缩短了育苗周期。 相似文献
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在乌江峡谷瘠薄山地的典型地段设立了两个造林试验点,采用不同的种植穴土壤覆盖保水措施进行了夹竹桃、柏木、刺桐、黄葛树、黄花槐5个树种的植苗造林试验,结果表明:不同的种植穴覆盖措施对不同树种当年的植苗造林成活率及成活植株3年生时的保存率均产生显著影响,地膜覆盖的当年植苗成活率最高,而杂草覆盖保存率最高。种植穴经用杂草覆盖后,5个树种3年生幼树期的高生长都存在一定优势,不同覆盖措施对5个树种3年生幼树期的地径生长影响不大。试验结果表明:刺桐和黄花槐较适宜用作乌江峡谷瘠薄山地的造林树种。 相似文献
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Weed control is fundamental in plantations of valuable broadleaved species. The most common weeding techniques are repeatedly applied herbicides and removable plastic mulching, both raising environmental concerns. We studied the performance of these techniques on a hybrid walnut plantation, compared with three biodegradable mulch alternatives: a prototype bioplastic film, a layer of composted woodchips and a layer of ramial chips. The durability and effect of the treatments on tree performance (survival, growth, physiological traits) and soil features (moisture and temperature) were evaluated over 4 years. Herbicide yielded the best results, while all the mulching treatments provided better results than controls for nearly all the variables. The performance of plastic and bioplastic films was similar, suggesting that the latter could replace plastic mulching. The performance of the two chip mulches was similar and slightly below that of the films, probably because of the excessive thickness of the former (13–14 cm). In summary, biodegradable mulches showed high effectiveness in controlling weeds and so could offer an alternative to herbicide application and plastic mulching when these are contra-indicated technically (accessibility, repeatability), economically (labour cost), legally or environmentally. 相似文献
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France Lambert Benoit Truax Daniel Gagnon Normand Chevrier 《Forest Ecology and Management》1994,70(1-3):231-244
The effects of mulching materials (black plastic and straw) and herbicide application (glyphosate) on growth and nitrogen nutrition of butternut (Juglans cinerea), white ash (Fraxinus americana) and bur oak (Quercus macrocarpa) were studied in a plantation established in an abandoned field in southern Québec (Canada) since 1987. To ascertain the efficiency of mulching materials on the performance of tree seedlings, a herbicide (glyphosate, 6 l ha−1) was applied in half of the experimental plots in June 1990 and 1991. Soil parameters (temperature, moisture) and soil nitrate and ammonium concentrations were measured during the growing season in 1991. In summer 1991, nitrogen nutrition of the seedlings was monitored using enzyme assays (nitrate reductase activity (NRA), glutamine synthetase activity (GSA)) of the leaves of the three deciduous tree species. Mulching affected soil parameters, with black plastic producing the highest soil temperature (23.4°C) and straw the highest soil moisture (183.6 g kg−1) in June. NRA varied in relation to tree species, herbicide application, mulching material and time. GSA was poorly correlated to silvicultural treatments. Butternut showed the highest NRA, especially in herbicide plots irrespective of mulching material. Bur oak NRA showed less variation between herbicide and non-herbicide plots and reacted more to the mulching treatments. White ash NRA only showed an herbicide effect in June. All species reacted positively to the addition of an herbicide around the mulching material, but not to the same degree. Height and diameter increment ratios (with/without glyphosate application) indicate that butternut growth was the most improved by herbicide applications, followed by white ash and bur oak. This indicates that the effectiveness of mulching alone decreases in the following order: bur oak > white ash > butternut. The utilization of mulching material in abandoned fields as an alternative to herbicide application is closely linked to the species chosen. Enzyme assays (NRA) were shown to be a valuable tool for monitoring physiological status of planted trees subjected to environmental changes brought on by silvicultural practices. 相似文献
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为了解不同覆盖物对红松播种苗床土壤日蒸发量、土壤表层温度和种子出苗率及幼苗生长的影响,开展了不同覆盖物红松播种试验.结果 表明:不同覆盖物下土壤日蒸发量由大到小依次为CK、河沙、草炭土、松针、锯末和豆秸;河沙覆盖的土壤表层温度最高,其次是松针覆盖,豆秸覆盖的最低,锯末和草炭土覆盖下的土壤温度两者相差不大;松针、草炭土、... 相似文献
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对“平膜打孔法”、“直播平膜法”、“大田播种”三种育苗方法进行了对比试验,结果表明,采用“平膜打孔法”对苗木生产量提高幅度较大,大面积推广应用,可提前一年达标出圃.“平膜打孔法”在播种育苗生产实践中可操作性强. 相似文献