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991.
We evaluated differences between the forest floors and the establishment and growth of coniferous seedlings in fenced (13 years)
and unfenced plots on Mt Ohdaigahara where the sika deer (Cervus nippon) population density is high. Large coniferous seedlings (height > 0.05 m) were less abundant in the unfenced plot, as a result
of deer browsing. Small coniferous seedlings (height < 0.05 m), however, were more abundant in the unfenced plot, where most
seedlings of Abies homolepis were found on bare ground and those of Picea jezoensis var. hondoensis were found on buttresses and fallen logs. The large area of bare ground in the unfenced plot was caused by deer browsing.
Deer therefore have an indirect effect on the emergence and growth of small coniferous seedlings by modifying the forest floor. 相似文献
992.
In order to develop a fireproof wooden material, the synergic effect of fire-retardant chemicals and wood coatings was studied.
The fire performance was evaluated by cone calorimeter. Impregnation of fire retardants including polyphosphatic carbamate,
and ceramic coatings including alkoxy metal salt improved the fire performance of wooden materials. This treatment made it
possible to meet the guidelines for fire performance of noncombustible materials in Japan. In addition to the vacuum-pressure
impregnation treatment, hot-and-cold-bath impregnation treatment is an effective way to develop fire-retardant wood by impregnating
fire retardant and ceramic coating. The weatherability of the developed material was also investigated. The ceramic coating
was resistant to light and moisture.
Part of this report was presented at 54th Annual Meeting (Sapporo, August 2004) and the 55th Annual Meeting (Kyoto, March
2005) of the Japan Wood Research Society 相似文献
993.
世界贸易组织(简称WTO),作为处理世界自由贸易机制的国际组织,允许为可持续发展和保护自由贸易和环境选择利用世界自然资源。中国作为世界贸易组织成员国,签定入世议定书,入世后中国在林业的可持续发展方面受到世界贸易组织的条约和原则的制约和挑战。中国的林业资源应当作为基础资源加以保护,政府的行政管理职能在世界贸易组织的原则下加以改革。因此,中国林业的可持续发展的目.标是优先处理环境保护和经济发展的关系。在入世条件下,按照世界惯例,中国林业资源可持续发展问题瞄准中国林业体制改革,以便适用中国天然林业战略,依靠科技进步依法保护中国环境,特别是在中国林业保护和处理环境和自然资源等关系方面。依据世界贸易组织的协议和规则,建立林业的生态化体系,尤其是GATT20条的规定,保护中国林业可持续发展,为中国林业创建国际环境。表1参21。 相似文献
994.
Development, manufacture and application of Beta-Cypermethrin aqueous capsule suspension 总被引:1,自引:0,他引:1
LANGZi-jian SUYuan-ji WANGZhi-ying ChenLi-ping 《林业研究》2004,15(3):218-222
The optimal formula of Beta-Cypermethrin aqueous capsule suspension was screened out through the experiment,preparation and manufacture of basic formulas, which has no sedimentation, suspended drops of oil, peels and agglomerating and the diameter of capsule is in range of 10-30μm, conformed to the technical requirement. The aftereffect of the 3.3% Beta-Cypermethrin aqueous capsule suspension which was manufactured according to the optimal formula was up more than 25 days. The experiments on controlling the larvae of Dendrolinmus superans Butler and the adults of Xylotrechus rusticus L were carried out with different concentrations of this chemical. The death rate reached 80% when 250 times solution of the chemical was sprayed on stem to control the larvae of D. superans. For control of the adults of X. rusticus, 200, 400 and 600 times solution of the chemical were applied and their control effects (death rate) reached 85.23%, 74.21% and 66.59% respectively. Two kinds of solution (200 times and 300 times) of the chemical were used to control the larvae of D. superans in large area, and the control effect for both concentrations was over 90%. 相似文献
995.
996.
997.
扎龙国家级自然保护区游客客源特征调查分析 总被引:1,自引:2,他引:1
通过对扎龙自然保护区的游客进行问卷调查,得出游客的客源特征。结果表明:男、女游客的比例(2.1:1)高于全国平均出游性别比例1.27:1;大多数游客以观鸟、了解大自然和单位或会议组织为目的;具有高中以上学历的游客组成了扎龙自然保护区游客的主体;游客职业主要是公务员(46%),公司职员(19%)、工人(17%)和商人(11%);游客以20~39岁年龄段的游客为主体,表现出游客中青年化的总体趋势;月收入在300~1000元之间的游客比例最大,占47.26%,其次是月收入在1000~3000元之间的游客,占37.20%;扎龙自然保护区的游客以省内游客尤其是来自齐齐哈尔市的游客为主要客源。扎龙自然保护区的旅游需求以团体旅游为主体:最后对保护区的宣教工作提出若干建议。 相似文献
998.
在福建省邵武市对椽竹、孝顺竹、坭竹等几种造纸用丛生竹进行秆节育苗试验表明,用平埋方法育苗显著优于斜埋和直插,竹蔸平埋效果更佳;不同竹种秆节育苗成活率存在明显差异;不同年龄的秆节育苗成活率在不同竹种间表现不同;不同育苗时间(3月或5月)的成活率差异不显著。竹秆不同粗细、不同部位、单节段或双节段育苗对比试验,结果以细秆(胸径2.5cm)、上部节段、双节段育苗成活率较粗秆(胸径4.6cm)、下部节段、单节段的为高。椽竹秆节径用不同激素处理后,处理间成苗率差异显著,以2,4-D20mg/kg处理5h和硼酸20mg/kg处理24h的效果最佳。几种造纸用丛生竹秆节育苗试验*张文燕周道三马乃训叶长青曹德友张华明 相似文献
999.
Emma Wilhelmson Dianne Staal Wästerlund Lage Burström Per-Olof Bylund 《Small-Scale Forestry》2005,4(4):427-435
Little is known about the extent of work-related accidents occurring during the performance of forestry work by the non-industrial private forest owner or their assistant (hereafter called self-employed NIPF). The absence of an effective accident registration system largely excludes this group from accurate representation in official statistics. In this study, data from 1996 to 2001 were collected from hospital injury records managed by the Umeå Accident Analysis Group at the University Hospital in Umeå. During that period, it was found that 485 persons in the Umeå region were given medical attention due to injuries possibly acquired during self-employed forestry work. Questionnaires about the accidents were sent to each of the 485 injured persons and 80% were returned. Responses revealed that 225 of the respondents were injured during self-employed forestry work. Out of these, 81% performed fewer than 31 days of forestry work annually. Due to the injury, 29% had been on sick leave for some period of time and 42% had persistent symptoms. On average, each injury led to 13 days of sick leave and 24 hours of institutional care. Firewood production was shown to be a key factor behind the large number of accidents for self-employed NIPF. Further studies on the lack of knowledge about how the work should be done and conscious risk taking should be considered as an important link to the development of effective accident prevention strategies. 相似文献
1000.
Alexandre Behling Carlos Roberto Sanquetta Ana Paula Dalla Corte Sylvio Péllico Netto Aurélio Lourenço Rodrigues Bráulio Otomar Caron Augusto Arlindo Simon 《林业研究》2016,27(6):1211-1217
The amount of photosynthetic radiation intercepted by a crop is a function of the incident solar radiation on the plants, the leaf area index (L AI), and the light extinction coefficient (k). We quantified L AI and k in stands of black wattle (Acacia mearnsii De Wild.) over a 7-year growth cycle at two locations in the state of Rio Grande do Sul, Brazil. Our study was conducted in commercial stands in agroecological regions with high densities of black wattle plantations. L AI was calculated as the ratio between the leaf area of a tree and its planting space, and k was derived from Beer’s law. L AI depends on the planting site and stand age. Between the two sites, the L AI was similar over time, the amount of variation differed. Values of k depended only on stand age, with the highest average observed for stands up to 5 years old. The trend of k during the plantation cycle was inversely proportional to L AI and was correlated with L AI, leaf area, leaf dry mass, canopy volume, height, branches dry mass, total dry mass, and crown diameter. 相似文献