浅谈混凝土膨胀剂的应用     

崔承春  王玉新 《林业科技情报》2007,39(2):66-67

通过对混凝土膨胀剂的品种、性能及应用的论述,进而提出影响膨胀混凝土质量的因素及预防措施.  相似文献   

巨尾桉扦插育苗技术研究     

周建和  王少芳 《防护林科技》2005,(2):19-20,92

采用不同母株年龄的穗条、不同类型的插条、不同基质配比及不同浓度生根剂进行巨尾桉扦插育苗试验。结果表明:巨尾桉插条随母株年龄增大其生根率和生长量下降;嫩枝扦插生根率高、平均根数多、生长快;用珍珠岩和红土等量均匀混合的基质扦插效果好;用质量分数为50×10-6~200×10-6浓度的IBA浸泡2 h,能较大幅度提高扦插成活率。  相似文献   

Applied Behavior Analysis as a Development Tool: Examples from Agroforestry     

Sonia M. Goltz  Audrey L. Mayer 《Journal of Sustainable Forestry》2020,39(8):785-799

ABSTRACT

Applied behavior analysis can be used by development practitioners to improve the design and implementation of development programs. Programs are most successful when the goals and consequences of change agents, strategists, and adopters align, as we demonstrate with real-world examples from international agroforestry projects. We focus on the role of change agents acting as intermediaries between change strategists, such as large development agencies, and development adopters, the rural farmers who implement agroforestry projects. We describe three aspects that are particularly important for agroforestry projects: (1) identifying the rules being used, (2) assessing the roles and reinforcement contingencies of both individuals and larger groups, and (3) being flexible and able to respond to rapid change.  相似文献   

乳状分散松香胶的研制和试产   总被引：5，自引：0，他引：5  

丁礼金  叶青 《林产化学与工业》1996,16(2):63-68

对乳状分散松香胶制备工艺：分散体选择和用量、乳化温度、转相温度、助剂进行了研究，并在此基础上进行了试产，制得效果较好的产品．  相似文献   

玉米淀粉为原料制备API胶主剂的研究   总被引：3，自引：0，他引：3  

时君友  李春风 《木材工业》2006,20(6):8-10,19

将玉米淀粉复合,改性制得玉米淀粉悬浮液,加入水溶性高分子作为稳定剂,在一定条件下与天然玉米淀粉、碳酸钙、VAE乳液相混合,搅拌均匀,形成以玉米淀粉为原料的API胶黏剂主剂.用该胶黏剂压制的杨木、桦木胶合板,其湿强度可满足国际Ⅱ类胶合板的要求.  相似文献   

应用菊酯油烟剂喷烟防治杉木种子园害虫试验   总被引：1，自引：0，他引：1  

余荣卓 《福建林业科技》1997,24(1):86-88

1993-1994年在洋口林场应用3Y－25型脉冲式烟雾机喷施0．05％溴氰菊酯油烟剂防治杉木种子园害虫的试验。结果表明：菊酯油烟剂喷烟可同时防治杉木球果麦蛾、杉木蝙长蝽及杉梢小卷蛾的成虫和幼虫。二次处理区球果虫害率比对照下降45．6％。  相似文献   

菠萝果皮汁有效成分的研究     

古和平  林文光  邹建云 《热带农业科技》1997,(4)

菠萝果皮鲜汁蛋白酶活性一般在０．０３—０．０６万单位／ｇ，总糖６％—８％，总酸０．３５％—０．６５％，挥发酸０．０２％—０．２０％，ｐＨ值３．５—４．１。夏季有效成分比冬季高。随自然贮存时间延长，酶活性、总糖含量逐渐降低，总酸、挥发酸逐渐升高。尤以总糖变化最大，贮存６ｄ，下降幅度达８２％。保鲜剂对总糖保护有明显效果，对酶活性保护效果略差。  相似文献   

棉籽油及油脚合成汽车涂料固化剂原理的研究     

聂小安 《林产化学与工业》2001,21(3):42-46

以棉籽油及油脚为原料，经由甲酯化、异构化、聚合及酰胺化等反应，合成了汽车涂料固化剂，探讨了聚合反应的机理，并进行了应用性研究。试验表明，由棉籽油合成的聚酰胺，可以作为汽车电泳涂料固化剂，具有较为广阔的应用前景。  相似文献   

Large cardamom (Amomum subulatum Roxb.) plantation — An age old agroforestry system in Eastern Himalayas     

K. A. Singh  R. N. Rai  Patiram  D. T. Bhutia 《Agroforestry Systems》1989,9(3):241-257

Large cardamom (Amomum subulatum Roxb.) is a shade loving plant grown in the Indian hill states of Sikkim and Dargeeling district of West Bengal. About 30 important tree species are used to provide shade to the cardamom plants. Alnus nepalensis, a deciduous, nitrogen fixing and fast growing tree, is the species most commonly underplanted with cardamom. In addition to providing shade, it is also used for fuelwood. The old trees are cut and young plants coming up are allowed to grow in cyclic order. The quick decomposing leaf litter of A. nepalensis also fertilises the cardamom plants. The nitrogen added to the soil in this way has been found to be as high as 249 kg/ha. Large cardamom thrives well in a moist soil, which is maintained by water diverted from seasonal springs on the upper slopes. The system is well suited to conserving soil, water and tree cover of the characteristically steep slopes of the region. Moreover, the management inputs required for growing cardamom are low but the crop gives a higher financial return than rice or maize. The shade trees used in the system are also a major source of fuel, fodder and timber, especially as access to state owned forests is restricted by legislation. However, increasing incidence of viral chirkey and foorkey disease, panicle rot and capsule borer are reducing the cardamom productivity. It has been observed that integrating dairying and apiculture will further augment profitability from large cardamom agroforestry system.  相似文献   

Biology,incidence and host susceptibility of Pineus boerneri (Hemiptera: Adelgidae) in Colombian pine plantations     

Carlos A Rodas  Rubén Serna  Maria D Bolaños  Ginna M Granados  Michael J Wingfield 《Southern Forests》2015,77(3):165-171

Adelgids (Hemiptera) in the genus Pineus have been reported as introduced insect pests causing serious losses to Pinus plantations worldwide. In 2008, Pineus boerneri was recorded for the first time in Colombia, with infestations noted on Pinus kesiya, P. tecunumanii, P. maximinoi and P. oocarpa. The lack of information on this insect in Colombia prompted investigations of its life cycle and infestation levels as well as host susceptibility of the main Pinus species planted in Colombia. In addition, the possibility of using a Ceraeochrysa species, an already established predator of adelgids in Colombia, for biological control was considered. Results showed that Pineus boerneri in Colombia has an anholocyclic life cycle comprised of four instars with a complete duration of between 49 and 97 d. Infestations were higher in the middle and upper part of trees. Pinus kesiya and P. maximinoi had the highest levels of susceptibility in field as well as in greenhouse trials. A survey of naturally infested trees showed P. tecunumanii to be moderately susceptible, whereas P. patula and P. oocarpa had low levels of susceptibility in a greenhouse trial but were not susceptible in the field. Investigations considering the impact of predation of Ceraeochrysa species showed a high predation rate of up to 140 P. boerneri consumed per day by a single Ceraeochrysa individual. Other predators of P. boerneri were recorded but were not sufficiently common to warrant detailed study.  相似文献