四川花椒感官指标分析

花椒为芸香科花椒属植物,是重要的经济树种.四川花椒栽植面积广,且近年来发展面积逐渐扩大.本文测量了四川境内各花椒产地的感官检验指标、物理指标等.分析结果表明,感官检验以颜色差异最大,红花椒果皮以红色为主,色泽分布均匀、有光泽,冕宁正路椒暗红或浅红、较均匀;金阳青花椒为黄绿色,重庆九叶青花椒、遂宁蓬溪青花椒、洪雅藤椒为青绿色,雅安多营藤椒为青褐.物理检测以闭眼椒的含量差异值比较大,红花椒闭眼椒的百分含量为0.8％ ～9.04％,含量最大为冕宁正路椒(9.04％),含量最小为越西贡椒(0.8％).青花椒的闭眼椒百分含量为0.61％ ～ 15.48％,最大为遂宁蓬溪青花椒(15.48％),最小为洪雅藤椒(0.61％).研究结果可为对花椒品种选育提供理论指导.     

舟曲花椒生产与发展

舟曲花椒生产与发展马福友，陈立新（舟曲县林业局）舟曲县为我省花椒（Ｚａｎｔｈｏｘｙｓｐ）重点产区之一。目前全县有花椒树４１５万株，其中结果椒树２１０万株，１９９３年花椒产量２５．５万ｋｇ。初步规划，到“八五”期末全县花椒树发展到４３０万株，结果树保持...     

花椒虎天牛的生物学特性及危害研究

花椒虎天牛是椒树的主要害虫，可造成椒树大量死亡，而且防治困难。作者２ 年观察研究，并通过解剖大量被害椒树表明，花椒虎天牛虫态重叠（幼虫、蛹、成虫、卵可同时存在），多为一年生 １ 代，危害以春季秋季明显，主要危害期为 １～３ 龄幼虫，此时该虫取食椒树基干部的韧皮部，中断输导组织，被害椒树根部吸收水分无法运往树叶，使椒树整株枯死。     

大红袍花椒规范化栽培技术

大红袍花椒规范化栽培技术郭全建（宝鸡市林业局，陕西宝鸡７２１０００）大红袍花椒原产秦岭西部，故又称秦椒、凤椒。它是大花椒类中栽培面积最大、品质最优良的农家品种。其生物学特性与其它品种差异甚大，尤其是各物候期超前，决定了它在管理措施上的特殊性。现根据研...     

大红袍花椒规范化栽培技术

大红袍花椒规范化栽培技术郭全建（陕西省宝鸡市林业局宝鸡，７２１０００）大红袍花椒原产秦岭西部，又称秦椒、凤椒。它是大花椒类中栽培面积最大，品质最优良的农家品种。其生物学特性与其它品种差异甚大，尤其是各物候期超前，决定了它在管理措施上的特殊性。现根据研...     

花椒枝枯病损失量与防治效益研究

通过对810株18年生绵椒枝枯病损失量及防治效益研究，得到了花椒枝枯病情指数（X）与花椒损失率（Y）的一元线性回归方程Y=0.8146X-9.3719(r=0.98098)；花椒枝枯病不造成经济损失的临界病情指数为11.50，花椒枝枯病防治的经济阈值为病情指数19，防治指标为病情指数30.50。     

汉源花椒栽培及采收技术

"汉源花椒"亦称"清椒"、"黎椒",至今已有两千多年的栽培历史,自唐元年间(806年-820年)始贡朝庭,至清光绪二十九年(1903)免贡,历贡达1083年以上,故也有"贡椒"之名,以椒柄部附生1粒～3粒败育的小椒粒为其显著特征,俗称"子母椒"或"娃娃椒"[1].近20多年来"汉源花椒"更是以其千年"贡椒"的优异品质,享誉全国,名扬海外,深受广大消费者青睐.全国各地引种"汉源花椒"的地区也不少.为促进各地花椒产业稳步健康发展,根据汉源花椒千百年的种植、采收、贮运经验结合我们的工作实际,试总结制定该"汉源花椒种植、采收、贮运技术规程",供广大生产者参考.     

椒叶粉的加工利用

椒叶粉的加工利用孙钦航，成中余（咸阳市林业技术推广站，陕西咸阳７１２０００）何中银，吕秉林，宫建文长期以来，人们栽培花椒只重视其水土保护和果皮的食用、药用意义，而对其叶子的作用未能引起注意。针对渭北有丰富椒叶资源的现状，以及人们食用椒叶的习惯，从１９...     

花椒在山东的栽培历史和现状

花椒是重要的调味品,也是著名的木本油料(种子可榨油)和香料。果皮含芳香油,种子含油率达25～30％,枝干可作工艺品。栽培历史山东的花椒属有4种,其中野花椒(刺椒)、竹叶椒(钩椒、山椒)、香椒子(崖椒、小花椒)为野生,现在栽培的花椒是野生种驯化的还是从外地引入的,尚待考证。惟北魏贾思勰在《齐民要术》中记载花椒引入栽培情况很详细:“按今青州有蜀椒种,本商人居椒为业,见椒中     

甘肃陇南花椒果实性状及其生长表现分析

通过对甘肃省陇南市花椒品种资源圃已挂果的9个品种果实性状综合分析,以秦安1号、短柄大红袍果品质量综合最好;其次为德国椒、油椒、早绵椒,较差的为毛椒、构椒、豆椒和白椒。并对15个花椒品种的生长表现进行了测定。     

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.     

Decomposition and nutrient loss from prunings of different contour hedgerow species in tea plantations in the sloping highlands of Sri Lanka

Contour hedgerows of multipurpose tree species in the sloping tea lands of Sri Lanka are expected to reduce soil erosion and also add significant amounts of plant nutrients to the soil via periodic prunings. The objective of this experiment was to characterize the biomass decomposition pattern and quantify the amount of nutrients added through prunings of six tree species (Calliandra calothyrsus, Senna spectabilis, Euphatorium innulifolium, Flemingia congesta, Gliricidia sepium and Tithonia diversifolia) currently being used in hedgerows associated with tea. Withered leaf and stem prunings (50 g) were enclosed in 2-mm litter bags, placed at 5-cm depth and retrieved after one, three, six, nine and 12 weeks. Loss of initial dry weight, N, P and K was measured. Single exponential decay function adequately described both dry weight and nutrient loss. Tree species differed significantly in their rate of breakdown with decomposition constants (k) varying from 0.0299 to 0.2006 week⁻¹ for leaves and from 0.0225 to 0.0633 week⁻¹ for stems. Gliricidia showed the highest k for leaves with the rest in the following descending order: Senna > Tithonia ≥ Euphatorium > Calliandra > Flemingia. A similar pattern was observed for loss of all nutrients with Calliandra and Flemingia always having lower k values than the rest. Although N immobilization was not observed, immobilization of P and K was observed during the first week of incubation in some species, particularly in stem prunings. Annual biomass of prunings differed significantly between tree species in the following descending order: Calliandra > Senna > Flemingia > Tithonia > Gliricidia > Euphatorium. Calliandra added the greatest amount of nutrients annually to the soil with Euphatorium adding the least. Calliandra prunings provided the annual total K requirement and 49% of the N requirement of mature tea. However, none of the species provided more than 5% of the P requirement. It is concluded that among the tree species tested, Calliandra and Flemingia are the most suitable for contour hedgerows in tea plantations of this agroclimatic region because of their higher soil nutrient enrichment capacity and slower decomposition rates which would minimize leaching losses. This revised version was published online in June 2006 with corrections to the Cover Date.     

Growth of Phlebiopsis gigantea in wood of seven conifer species

Heterobasidion parviporum and Heterobasidion annosum are widely distributed root‐rot fungi that infect conifers throughout Europe. Infection of conifer stumps by spores of these pathogens can be controlled by treating fresh stumps with a competing non‐pathogenic fungus, Phlebiopsis gigantea. In this study, growth of three Latvian strains of P. gigantea and the biological control agent ‘Rotstop’ strain was evaluated in stem pieces of Norway spruce, Scots pine, lodgepole pine, Douglas‐fir, Weymouth pine, Siberian larch and Sitka spruce. The growth rates of one H. parviporum and one H. annosum isolate were also measured in the same stem pieces. The growth rate of P. gigantea varied greatly in wood of different conifer species. It was higher in the three pine species, lower in Norway spruce and lowest in Sitka spruce and Siberian larch, and in Douglas‐fir, this fungus did not grow. The largest area of wood occupied by P. gigantea was in lodgepole pine. Growth of Latvian isolates of P. gigantea in the wood of Pinus and Picea species was comparable to that of the Rotstop isolate. Consequently, stump treatment with local P. gigantea isolates should be recommended. However, our results suggest that Douglas‐fir stump treatment against Heterobasidion by P. gigantea may be ineffective and other stump treatment methods should be considered.     

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.     

Effects of Seed Weight and Seed Type on Early Seedling Growth of Pinus sylvestris under Harsh and Optimal Conditions

The effects of seed weight and seed type on seedling growth of Pinus sylvestris (L.) were studied by seeding individually weighed orchard and stand seed in different mixtures under harsh (direct seeding in field) and optimal (seeding in nursery) conditions. In the nursery experiment an increase in the seed weight from 3 to 7 mg increased the seedling height by 10-27% and total weight by 27-113%, and decreased the height/diameter ratio by 5-6% after 2 yrs. With elimination of seed weight effects, orchard seedlings were 2% taller than stand seedlings in year 2. Without elimination of seed weight effects, orchard seedlings were 7-13% taller. In the field experiment an increase in the seed weight from 3 to 7 mg increased seedling height by 18-65%, stem volume by 81-274% and the number of top-buds by 23-34% in year 5. After elimination of seed weight effects, orchard seedlings were 7-13% taller than stand seedlings and without elimination of seed weight effects 20-21% taller after 5 yrs. Even after elimination of both seed weight and genetic effects orchard seedlings were 3-9% larger than stand seedlings in the field experiment. In conclusion, the influence of seed weight and seed type on growth traits and slenderness is highly significant and the influence seems to be greater in harsh 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。     

Potential to harness superior nutritional qualities of exotic baobabs if local adaptation can be conferred through grafting

Baobab leaves form an important part of the local diet in Sahel countries and elsewhere in Africa. Existing leaf nutritional data and agroforestry performance information are based solely on Adansonia digitata L., the baobab of continental Africa. The introduction potential of Adansonia species from the center of diversity in Madagascar and from Australia remains untapped. To assess this potential, the mineral contents and B₁ and B₂ vitamin levels of dried baobab leaves were determined for five-year old trees of A. digitata, A. gibbosa (A. Cunn.) Guymer ex D. Baum, A. rubrostipa Jum. & H. Perrier (syn. A. fony Baill.), A. perrieri Capuron and A. za Baill. grown in an introduction trial in Mali. Nutritional data were evaluated against survival and vigor to identify promising germplasm. Leaf vitamin and crude protein contents were highest in the Madagascar species, especially A. rubrostipa (B₁ 88 mg 100 g⁻¹, B₂ 187 mg 100 g⁻¹, protein 20.7% dry weight). However, the local species far outperformed the introductions in survival, tree height, basal diameter and resistance to termites. We suggest grafting as a way of harnessing the vigor of well-adapted local baobab varieties to the superior nutritional profiles of A. rubrostipa and others. Cross-species grafting tests in Adansonia were successful, thus creating new agroforestry possibilities with different scion/rootstock combinations.     

Modelling of adequate pretwist for obtaining straight timber

Abstract

Wood in general and wooden studs in particular are often distorted owing to uneven shrinkage during the drying process in the sawmill. Twist is often the most detrimental of all types of distortion, and it is caused by spiral grain in combination with variations in moisture content. For sawmills, the objective is to produce dried, straight boards, and one method of dealing with boards with excessive spiral grain is to sort them out and then dry them in a pretwisted position to obtain straight boards after drying. A model using the finite element (FE) method for the simulation of drying twist distortions was first calibrated against laboratory experiments in which boards were dried with and without restraints and pretwists. After the calibration, the FE results were compared with industrial test results for boards that were dried without restraints or with restraints with zero pretwist, i.e. straight restraints. The FE model used an elastic–ideally plastic material model to obtain permanent deformations. The calibration was to set the yield stresses so that there was a good match between FE results and results from the laboratory experiments. The comparison between the industrial test results and the FE results showed that the FE model is capable of realistic simulations of drying boards with and without restraints and presumably also pretwists.