西乡县濒危野生动物资源及保护对策

西乡县境内共有濒危野生动物87种,其中国家Ⅰ级保护动物7种、国家Ⅱ级保护动物41种、陕西省重点保护动物37种、列入国际贸易公约动物但未列入国家和陕西省重点保护动物的2种,并从3个方面提出了加强野生动物保护的对策。     

江西龙虎山中华秋沙鸭自然保护区野生动植物资源调查

调查确定江西龙虎山中华秋沙鸭自然保护区维管束植物有190科603属1 280种,其中国家Ⅰ级重点保护植物2种,国家Ⅱ级重点保护植物18种;野生脊椎动物5纲33目87科266种,其中国家Ⅰ级保护动物有3种,国家Ⅱ级保护动物有28种。提出一些保护管理建议,加强保护管理。     

江西铜钹山自然保护区动植物资源调查

调查确定江西铜钹山自然保护区维管束植物有192科706属1540种,其中国家Ⅰ级重点保护植物5种,国家Ⅱ级重点保护植物15种;野生脊椎动物5纲32目86科275种,其中国家Ⅰ级保护动物有3种,国家Ⅱ级保护动物有28种。建议加大措施,进一步做好保护管理工作。     

安阳漳河峡谷国家湿地公园生物多样性保护对策

对安阳漳河峡谷国家湿地公园生物多样性进行了物种现状调查。查清了现有植物资源70科181属413种,其中国家Ⅱ级重点保护植物3种;动物资源31目76科170属238种,其中国家Ⅰ级保护动物有2种、国家Ⅱ级保护动物有24种。对湿地生态系统进行了客观评价,分析了湿地生物多样性保护存在面临的主要问题,有针对性地提出了保护对策。     

博峪河保护区动植物资源特点与保护对策

以博峪河省级自然保护区野生动植物资源为研究对象,开展了野生动植物种类、国家重点保护对象、影响因素等方面的研究。结果表明:保护区分布高等植物有133科528属1 185种,国家重点保护植物有10种,其中:国家Ⅰ级保护植物3种,国家Ⅱ级保护植物7种;保护区分布脊椎动物5纲27目62科236种(亚种),国家重点保护动物有39种,其中:国家Ⅰ级保护动物10种,国家Ⅱ级保护动29种。根据保护区内野生动植物分布特点和影响保护区因素,提出了加强巡护监测、社区共管、宣传教育、能力建设等保护对策。     

一颗璀璨的绿色明珠——记全国绿色小康县重庆石柱县

石柱县,名列重庆币七大森林资源大县之,森林资源十分丰富,境内野生动植物种类繁多,有高等维管束植物2182种、陆生野生脊椎动物329种、昆虫1053种,其中,有国家Ⅰ级保护植物7种、Ⅱ级保护植物46种;国家Ⅰ级保护动物5种、Ⅱ级保护动物37种,还是我国水杉的原生地之一和三峡水库建成蓄水后我国惟一的荷叶铁线蕨的原生栖息地,是三峡库区生物多样性最丰富的地区之一。     

祁连山生物多样性保护现状与发展措施

甘肃祁连山同家级自然保护区地处祁连山北坡东、中段,位于青藏、内蒙古、陕西黄土高原交汇地带,地理环境独特,生物种类丰富,生态系统多样。保护区内分布有高等植物95科451属1311种,野生脊椎动物28目63科286种。有国家一二级保护动物53种,国家保护的有益的或者具有重要经济价值、科研价值的动物140种;甘肃省保护动物6种,     

后河国家级自然保护区鸟类资源调查

为探明后河自然保护区鸟类资源，于2003年7月10日～8月8日，采用样带法等对保护区进行鸟类资源调查。结果记录有164种鸟类，其中属于国家Ⅰ级保护动物1种，国家Ⅱ级保护动物32种，湖北省级保护动物30种，属于国家林业局公布的《国家保护的有益的或者有重要经济、科学研究价值的陆生野生动物名录》中的种类92种，保护区新记录7种。     

西藏色林措国家级自然保护区野生动植物资源调查

通过抽样调查法、运用样线和样点法两种方式,对西藏色林措自然保护区野生动植物资源进行调查,共发现国家Ⅰ级重点保护动物10种,国家Ⅱ级重点保护动物22种;区域内脊椎动物中有10种为中国特有种,9种为青藏高原特有种;国家Ⅱ级保护植物2种,中国特有种2种。     

皖西大别山药用脊椎动物资源与利用研究

研究了皖西大别山野生药用脊椎动物资源的分布及应用。该区现有野生药用脊椎动物5纲58科123种,其中国家I级保护动物2种,II级保护动物9种。并就如何保持动物资源的可持续发展和合理利用进行了探讨,提出了药用动物资源保护及其开发利用的若干建议,以推动当地经济的发展。     

Browsing Damage on Pine (Pinus sylvestris and P. contorta) by a migrating moose (Alces alces) Population in Winter: Relation to Habitat Composition and Road Barriers

In Scandinavia, moose (Alces alces L.) sometimes cause severe browsing damage to economically-important pine. Moose-vehicle accidents have spurred construction of fences along roads, and these may interfere with moose migration between summer and winter ranges, or the road alone may be a barrier. If this happens and moose build up along roads, landowners may suffer economically. Therefore, this study investigated whether roads, fences or other factors influence the use of young pine stands by moose. Eighty stands along roads in northern Sweden were evaluated in which individually-browsed branches were counted on 9972 pines. Moose browsing was not significantly related to birch (Betula pendula Roth, B. pubescens Ehrh.) density, nor did it differ between pines (Pinus contorta Douglas or P. sylvestris L.). However, increased pine density, site productivity and proximity to a highway were associated with increased browsing. Further large-scale studies are needed to understand moose habitat selection and the effects of roads.     

Effects of Root Freezing on the Physiology and Growth of Picea glauca,Picea mariana and Pinus banksiana Seedlings Under Different Soil Moisture Regimes

The root systems of 2-yr-old Picea glauca, Picea mariana and Pinus banksiana seedlings were submitted to various frost temperatures during an artificial frost to induce different levels of root damage. Frost-damaged and control seedlings were placed in a greenhouse under high and low soil moisture regimes. Seedling growth and physiology were evaluated periodically. Seedling survival was reduced when root damage reached levels of 60-80%. Root systems of all three species showed partial to total recovery by the end of the experiment. In general, root freezing damage caused reductions in seedling growth, with these reductions becoming less significant over time. Root damage had little to no effect on black spruce and jack pine seedling physiology, while white spruce CO 2 uptake decreased with increasing root damage. Shoot nitrogen content of all three species decreased slightly with increasing root damage.     

Stand Structure in Pine,Spruce and Deciduous Forests: A Comparison Between Finnish and Russian Karelia

This study investigated the stand structure in pine, spruce and deciduous forests in the border district of Finland and Russia. A total of 46 mature forest stands was selected as pairs, the members of each pair being as similar as possible with respect to their forest site type, age, moisture and topography. The stands were then compared between the two countries by means of basal areas and number of stems. The proportions of dominating tree species were 2-12% lower, and correspondingly the proportions of secondary tree species higher, in Russian forests. The density of the forest stock was also higher in each forest type in Russia. The forests in the two countries differed most radically in terms of the abundance of dead trees. The amount was two to four times higher in Russian deciduous and spruce forests, and in pine forests the difference was 10-fold. The stand structures indicated that Russian coniferous stands, in particular, were more heterogeneous than intensively managed pine and spruce stands in Finland.     

Growth and Terminal Bud Formation in Picea abies Seedlings Grown with Alternating Diurnal Temperature and Different Light Qualities

The root collar diameter and the height:diameter ratio are of particular importance in container-grown seedlings where a high density in the containers may produce spindly seedlings. Temperature regimes and light quality are known to affect plant growth. The aim of this study was to identify responses in Picea abies (L.) Karst. seedlings grown with light providing different red:far-red ratios and under temperature regimes with alternating day (DT) and night temperature (NT) from negative (DT < NT) to positive (DT > NT) difference (DIF) between DT and NT. Experiments were conducted in controlled environment chambers and in a daylight phytotron. Only limited thermoperiodic responses appeared in P . abies seedlings with respect to seedling height and dry weight accumulation. The formation of terminal buds, however, was clearly delayed in seedlings grown at negative DIF. The results indicate a requirement for day extension light that is high in far-red, to prevent terminal bud formation under natural short-day conditions. An extended study should be conducted to clarify the minimum level of light intensity and the optimal light quality needed to prevent terminal bud formation under natural short-day conditions.     

CAD与建筑设计的关系

本文分析了CAD在设计中引起的正面和负面影响,并进行了系统的阐述,从而使设计者在应用中能够保持客观的态度。     

Natural Regeneration in Clear-cuts: Effects of Scarification,Slash Removal and Clear-cut Age

The effects of soil scarification (mounding), slash removal and clear-cut age on the natural regeneration in clear-cuts was evaluated using data from four sites in southern Sweden. The treatments were carried out during a good seed and establishment year for birch ( Betula pubescens Ehrh. and B. pendula Roth). Scarification had the strongest positive effect on the density of naturally regenerated seedlings, especially in birch, but also in pine ( Pinus sylvestris L.) and spruce [ Picea abies (L.) Karst]. Slash removal had a positive effect on birch density. No statistically significant effect of clear-cut age was found. In addition, no statistically significant interactions between clear-cut age and scarification or slash removal were found. The ingrowth of field vegetation was the fastest in areas that were not scarified, less rapid in areas scarified on old clear-cuts, and the slowest after scarification in fresh clear-cuts. In conclusion, it may be possible to control the density of birch during a good establishment year for birch. If birch is desired, the best combination of treatments is to remove the slash and scarify; otherwise, these treatments should be avoided.     

Risk Perception Among Non-industrial Private Forest Owners

Based on an enquiry, risk perception among non-industrial private forest owners is described in relation to climate change and forestry hazards. Of the respondents, 11% took action to remedy the effects of climate change. Out of a given set, hazards were ranked according to each respondent's experience of recent substantial financial loss to the estate and in relation to his or her willingness to make investments aimed at risk reduction. For each hazard, the respondent assessed the risk in four classes ranging from very high to negligible risk. Six hazards were considered most problematic in all three aspects: browsing damage, falling timber prices, damage by wind, spruce bark beetle, root rot and pine weevil. A majority of the respondents claimed to take action to reduce the risk associated with at least one hazard, while 35% did not know whether they did. Excluding climate change, the need for decision support was the largest in relation to damage by wind owing to a combination of perceived high risk and a high level of ignorance in relation to whether risk-reducing measures were taken.     

Interactions in decomposition and N mineralization between tropical legume residue components

In situ produced plant residues contain a mixture of different plant components of varying quality. To assess synergistic or antagonistic interactions occurring during the decomposition and mineralization of such mixtures, individual plant parts (stems, leaves, leaf litter and roots) or the mixture of stems, leaves and leaf litter of the agroforestry species pigeonpea (Cajanus cajan) or of crop residues of peanut (Arachis hypogaea) or of the weed hairy indigo (Indigofera hirsuta) were incubated in pots for 19 weeks. Periodically, remaining plant residues were sieved out (>2 mm), weighed and N content as well as soil mineral N determined. Above- and below-ground residues of peanut decomposed fastest and showed the largest N release in agreement with their high N concentration and low-acid detergent fibre (ADF) : N ratio. Hairy indigo was hypothesized to be of lower quality than pigeonpea because of its high-polyphenol content. However, it decomposed faster than pigeonpea, largely because of the higher N and lower lignin concentration of its components. Ranking of individual plant components for N mineralization resulted in the following pattern, leaves > leaf litter > roots > stems. In mixtures of the different plant components a similar species order in decomposition was obtained, e.g. peanut > hairy indigo > pigeonpea. The amount of N released from the mixture was dominated by stem material that comprised 46–61% of the mixture. The interactions in mixtures were relatively small for peanut (generally high-quality components) as well as for pigeonpea (low proportion of high-quality components, i.e. N rich leaf material). However, a positive interaction occurred during later stages of N mineralization in the mixture of hairy indigo as it had a significant proportion of N rich components and absence of highly reactive polyphenols. Thus, for plants with low to intermediate chemical quality attributes, manipulating plant composition (e.g. by varying harvest age, affecting stem and leaf proportions) will be important to obtain significant interactions during decomposition when its components are mixed.     

Pasture production and tree growth in a young pine plantation fertilized with inorganic fertilizers and milk sewage in northwestern Spain

The use of organic waste materials such as milk sewage as an organic fertilizer could have the dual advantages of organic-waste disposal and reduced dependence on inorganic fertilizers. The effects of fertilization with (1) conventional mineral fertilization, (2) milk sewage sludge at 40 kg N ha⁻¹ target rate and (3) no fertilization on pasture production and tree growth were examined in an experiment consisting of two pasture mixtures under a one-year-old Pinus radiata plantation with a density of 2500 trees ha⁻¹. The two pasture mixtures were: (1) Dactylis glomerata L. var. saborto (25 kg ha⁻¹) + Trifolium repens L. group Ladino (4 kg ha⁻¹) + Trifolium pratense L. var. Marino (1 kg ha⁻¹); (2) Lolium perenne L. var. Tove (25 kg ha⁻¹) + Trifolium repens L. group Ladino (4 kg ha⁻¹) + Trifolium pratense L. var. Marino (1 kg ha⁻¹). The experiment began in the spring of 1995 using a randomized block design with three replicates in Castro Riberas de Lea (Lugo, Galicia, north-western Spain). Plot size was 12 × 8 m², with a 1 m buffer strip between plots. Two-year data showed that fertilization with either material had a positive effect on pasture production, with no significant difference between the two fertilization treatments. Tree growth in the milk sewage sludge plot was significantly higher than in the control plots. Inorganic fertilization increased pasture production, but affected tree growth negatively. The results show that milk sewage sludge could be used as a fertilizer in silvo-pastoral systems. This revised version was published online in June 2006 with corrections to the Cover Date.