柚木(Tectona grandis)无性系繁育及造林技术

柚木为马鞭草科柚木属植物,是世界上最珍贵的用材树种之一。文章介绍了柚木的生物学特性、无性繁殖即组培技术要点以及造林技术,论述了柚木在我省的推广前景。     

浙江淳安新安江开发公司封山育林效益研究

浙江省淳安县新安江开发公司所属16个国营林场22475.53hm~3荒山迹地,封山育林30年,现有天然次生林总蓄积量135万m~3,年总生长率8.07％,活立木直接经济价值2.25亿元。到1987年止公司已获中间利用净收入2135万元。近20年累计天然次生林比无林地多涵蓄水10亿m~3,每年进入水库的泥沙量减少80％,对调节水库水源、延长发电年限、纯洁水质都起到良好作用。公司长期实施的5项管护技术,把封山育林提高到科学经营水平,在千岛湖区成功地建立了森林生态屏障。     

辽西北困难立地造林有关建议

辽西北地区造林成效很低究其根源,概括起来,困难立地造林主要问题也不少。     

浅谈林业生产中的造林及抚育技术

在林业生产的过程中,采用正确、合理的造林技术和抚育技术,能够提高造林成活率,确保林木健康生长,并在短时间内构建完善的林分结构。而科学的抚育管理,又能进一步挖掘林业发展潜力,提升林地质量和产量,为林业发展创造更多的空间。同时做好造林和森林抚育工作,能够有效地促进林业科学发展,更好地应对全球气候变化的挑战。     

不同马尾松杂种F_1代早期生长的比较

在福建省大田梅林国有林场连续4年调查火炬松×马尾松、湿地松×马尾松杂种F1代以及马尾松纯种苗木造林早期生长情况,结果表明：幼树存活率在造林4年后趋于稳定,且火炬松×马尾松杂种F1存活率高于湿地松×马尾松。火炬松×马尾松、湿地松×马尾松杂种F1代和马尾松纯种3个树种4年生以下（含4年生）幼树的平均地径（胸径）、抽梢、树高生长总体大小依次为：火炬松×马尾松〉湿地松×马尾松〉马尾松纯种,但3个树种间差异均不显著。4年生（48个月）幼树火炬松×马尾松杂种F1代和马尾松纯种平均树高差异显著;50个月生幼树火炬松×马尾松杂种F1代和马尾松纯种间、湿地松×马尾松杂种F1代与马尾松纯种间差异显著,但火炬松×马尾松与湿地松×马尾松间差异不显著。     

东沙窝沙漠区不同造林技术效果分析

通过对东沙窝沙漠区采取提前整地、压沙等方式,选用良种壮苗、蘸泥浆、覆沙、平茬复壮、纯林改混交林等综合技术进行造林试验,结果表明,试验区造林成活率、保存率普遍提高,小气候环境明显改善:植被区风速比旷野区降低了25.8%～32.6%;灌木固沙林在夏季降低气温10℃左右,降低地温6～10℃,冬季地面最高温度提高2～4℃。     

具有交易费用和马氏调制的均值-方差组合选择

研究了均值-方差准则下，最优投资组合选择问题.投资者为了增加财富它可以在金融市场上投资.金融市场由一个无风险资产和n个带跳的风险资产组成，并假设金融市场具有马氏调制，买卖风险资产时，考虑交易费用.目标是，在终值财富的均值等于d的限制下，使终值财富的方差最小，即均值-方差组合选择问题.应用随机控制的理论解决该问题，获得了最优的投资策略和有效边界.     

Analysis on Knowledge Sharing Under the Incomplete Information Condition

Knowledge sharing is the important way in which enterprises create organizational knowledge and obtain competition advantage.Scholars always have difference viewpoints about the motivators in knowledge sharing.This paper(analyzes) the incomplete information game and the choice of the motivators in knowledge sharing.If the knowledge(acceptant) offers motivators to the knowledge owner,knowledge sharing might make the participants obtain knowledge-sharing incomes.If knowledge-sharing incomes can make up the participants' costs,knowledge sharing can be caught through.Because the information of knowledge's value is incomplete,enterprises need knowledge managers and organizational additional motivators promote knowledge sharing.     

Management System of the Tender and Bidding for Power Projects with a Valuation Based on the Bill of Quantities

Valuation based on the bill of quantifies will change the existing valuation mode of tender and bidding. For the standardized management of tender and bidding for power projects and the inteUigentized information management of power enterprises, it is an inevitable trend of reform to apply the valuation mode based on the bill of quantifies. According to the characteristics of power projects, this paper expounds the working process of the valuation mode based on the bill of quantities and analyzes the goal and function need of the tender and bidding management system. Considering the calculation procedure of the valuation and the quote strategy of quantities bill, the composition of fees for the valuation is settled and the calculation method is designed. To establish the management system of tender and bidding with a valuation based on the bill of quantities is beneficial for the costing reform of power projects and the perfection of the tender and bidding market. Therefore it is of great significance to spread the new management mode of project costing with a valuation based on the bill of quantities.