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51.
乌饭树组织培养移栽技术研究 总被引:1,自引:0,他引:1
根据乌饭树喜酸、喜湿的生物学特性,研究了试管苗移栽前后的一系列配套技术,摸索出最佳移栽程序,移栽成活率达90%。 相似文献
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The herbicide, hexazinone, was applied four ways over ponderosa pine, 2–0 seedlings planted in northeast Oregon. The four treatments were two broadcast applications, a single broadcast application, a large spot application, and a small spot application. Seedling survival and growth were monitored for five growing seasons. Results indicate that survival more than doubled with either large or small spot applications compared to no application, and either one or two broadcast applications can increase survival an additional 30% over spot applications. Differences in stem volume were substantial, with two broadcast applications yielding more than twice the volume of a single broadcast treatment and more than five times the volume of seedlings treated with spot applications. Trees in small spots were still three times bigger than surviving seedlings in the control. These results are consistent with the concept of competition threshold. Management implications were considered in terms of cost of established seedlings. Although broadcast applications cost more per acre than spot applications, gains in seedling survival, growth and quality offset the additional cost and translate into lower established seedling costs. The cost effectiveness of broadcast applications also may be seen in the elimination of replanting or in-planting requirements and increases in long-term growth potential of the established trees. 相似文献
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Leonor Cataln Carlos Carranza Laura Gonzlez Ulf Karlin Marcela Ledesma 《Forest Ecology and Management》1994,70(1-3):113-119
In implantation trials carried out with Prosopis chilensis and Prosopis flexuosa, the following variables were considered: implantation time (December and March), implantation technique (direct seeding and seedling transplantation) and age of the seedlings at the time of transplantation (60, 105 and 150 days). Survival was evaluated for more than 9 months after implantation and trials were repeated in 3 consecutive years.
Results from both species were similar and they show that survival after transplantation was higher (60–80%) than from direct seeding (35–45%). Survival from transplantation was independent of the size and age of the seedlings and it was less affected by climatic conditions than direct field sowing. Survival from direct seeding was higher in March than in December. The best time for either implantation alternative would be the end of the summer or beginning of fall, when climatic conditions increase the probability of seedling survival. 相似文献
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大树引入城市是改变城市生态环境、提高城市绿化绿地质量、生态效益和景观的有效途径。本文分析了进城大树成活率低的原因,提出了提高大树成活率的对策。 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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洪泽湖大堤旱柳防浪林更新的问题与对策 总被引:1,自引:0,他引:1
本研究从1990年开始对洪泽湖大堤迎湖面林台上新植的插干旱柳的生长进行了观察,对洪泽湖大堤的小气候因子、土壤因子进行了测定,分析了这些自然条件与柳树生长的关系以及病虫害、栽培技术对柳树生长的影响,从而明确了影响柳树成活的原因。针对柳树死因,设计了4种栽植方式并进行比较试验,优选出可以大幅度提高柳树更新成活率的最佳栽植方式,提出了提高柳树成活率的一套栽培技术措施。 相似文献