种子直播建立高标准银杏采叶园技术的研究   总被引：2，自引：1，他引：1  

俞飞飞  丁增成 《安徽农业科学》1998,26(2):168-169

专用型银杏采叶园，已成为当今银杏栽培的最主要模式。种子直播建立银杏采叶园，使生产成本大大地降低，实现了当年投资当年取得显著的经济效益。笔者从①种子的选择；②种子贮藏与播种方法；③覆盖技术；④根外补肥技术入手，旨在解决种子建园中的出芽率问题、病害问题、采叶量问题。为我省的银杏采叶园建设提供量的参考。  相似文献   

热科院行政效能监察建设初探     

于钦华 《热带农业科学》2009,29(12):64-67

对中国热带农业科学院行政效能监察的现状与问题进行分析,并针对这些问题提出提高对行政效能监察内涵的认识,延伸行政效能监察工作触角,建立完善的领导体制和工作机制,增强行政效能监察工作的针对性,完善行政效能监察工作的制度建设等行政效能监察建设的措施。  相似文献   

乡村社区总体营造发展模式之探讨     

张俊斌  廖绍安  梁大庆 《水土保持研究》2007,14(1):259-262

乡村地区之社区总体营造是目前台湾近年来各公部门所极力推行的社区再造运动，发展模式主要是以民间力量为基础。相关部门所扮演的角色则是经费及技术支持者。由于社区总体营造所涵盖的范畴极为广泛，因此大部分营造成功的社区是在推动社造初期时就将社区未来的发展定位的某个范围里。以台湾彰化县仑雅乡村为例。发展成生态社区、人文社区、古迹文化社区等多种范围的定位，有明确的定位后在逐渐发展出社区未来营造的主轴，随着营造主轴有顺序的制定发展方针。现已成功地让乡村民众能够透过概念式的构想延伸至发展策略来进行社区营造的实际进行。并且有效的提升社区民众参与公共事务的比例。让推动者藉由社造概念的启发了解社区未来营造的方向及目标。  相似文献   

太子山马尾松种子园营建技术研究   总被引：5，自引：1，他引：5  

高大雄  刘宗友  王希群  王罗荣  代新平  邱龙广  谢经荣  王昌玉 《湖北林业科技》2003,(1):15-21

本文从建园材料选择和收集、嫁接技术、建植方式及定植密度、种子园营建和激素对促进球花形成的研究等方面总结了太子山马尾松种子园建设的技术及经验。太子山种子园的建成不但加速了我省马尾松良种化的进程 ,而且为今后我省马尾松种子园营建和育种提供了理论依据和材料。  相似文献   

Relative contribution of initial root and shoot morphology in predicting field performance of hardwood seedlings   总被引：4，自引：1，他引：4  

D.F. Jacobs  K.F. Salifu  J.R. Seifert 《New Forests》2005,30(2-3):235-251

Single and multiple linear regression techniques were used to explain the capacity of initial seedling root volume (Rv) and first-order lateral roots (FOLR) relative to shoot height, diameter, and fresh mass to serve as important indicators of stock quality and predictors of first- and second-year height and diameter on an afforestation site in southern Indiana, USA. This was accomplished for northern red oak (Quercus rubra L.), white oak (Quercus alba L.), and black cherry (Prunus serotina Ehrh) seedlings graded into four Rv categories at establishment. Field survival was high (85–97%) for all species. Initial diameter, height, fresh mass, and Rv provided similar predictive ability of second-year field response for absolute height (R² = 0.59–0.77) and diameter (R² = 0.50–0.73) for both oak species. Initial seedling Rv was a better predictor of field response than FOLR for both oak species, though not for cherry. Multiple-variable models accounted for a greater proportion of the total variation in seedling field height and diameter than did single-variable equations. The high R² (up to 0.95) of regression models suggests field performance of these species can be reliably predicted and confirms the importance of initial seedling morphology in dictating early plantation performance.  相似文献   

建设宁波生态屏障的必要性及发展对策     

沈定夫  陈火春  汤社平  王金荣 《浙江林业科技》2003,23(6):60-63

在分析宁波建设生态屏障必要性和有利条件的基础上，提出今后一段时期宁波生态屏障建设的目标、重点及应采取的对策。  相似文献   

The propagation of Ramón (Brosimum alicastrum Sw.; Moraceae) in Mayan homegardens of the Yucatan peninsula of Mexico     

Gillespie  A.R.  Bocanegra-Ferguson  D.M.  Jimenez-Osornio  J.J. 《New Forests》2004,27(1):25-38

In the Yucatan peninsula of Mexico, Maya natives have been propagating important species for centuries. However, little documentation exists of these methods, and traditional knowledge is fading as younger generations seek work in urban centers. With growing interest in using some of these species for plantation-scale production, this knowledge should be captured to aid in propagation and cultural methods of selected species. One such species, Ramón (Brosimum alicastrum Sw.), is grown in Mayan homegardens primarily as a source of dry season forage. We conducted a survey of Mayan families in several municipalities to determine basic propagation habits and procedures for cultivating Ramón, and used this information to conduct some controlled-environment studies of reproductive ecology of the species. Our survey showed that all or most Maya grow the Ramón tree in homegardens for forage and that the tree is both cultivated from wild seedlings as well as planted on a small scale. Propagation is by seed and young seedlings are irrigated until they are established. We examined the effects of temperature on seed germination and found that maximum germination occurred between 27° and 38 °C, with best germination and growth of healthy seedlings at 33 °C. No germination occurred below 21° or above 44 °C. Simulated Maya irrigation gave a four-fold increase in growth rate of seedlings, aiding early establishment. Watering gave seedlings of greater biomass, greater stem and root length, and greater numbers and size of leaves. This magnitude of response may provide an economic return for plantation culture of Ramón for forage production.  相似文献   

Trees and windbreaks in the Sahel: establishment,growth, nutritive,and calorific values     

J. P. A. Lamers  K. Michels  R. J. Vandenbeldt 《Agroforestry Systems》1994,26(3):171-184

Tree and windbreak species considered for the Southern Sahelian Zone (SSZ) of West Africa have to be evaluated following multiple criteria such as fast establishment, shelter efficiency, production of feed for livestock, and firewood. An on-station experiment was conducted on a sandy soil in southwest Niger between 1988 and 1993 to assess the establishment, growth, nutritive, and calorific values of seven species considered for windbreaks:Andropogon gayanus, Bauhinia rufescens, Acacia holosericea, Acacia nilotica, Acacia senegal, Faidherbia albida, andAzadirachta indica. Mortality and stem diameter were monitored twice a year. From 20 months after planting (MAP) onwards, species were annually trimmed to 2 m height and to 1 m sidewards of the main stem. Fresh and dry weight of leaves, twigs, wood, and fruits were recorded. Leaves were analyzed for crude protein (CP) and metabolizable energy (ME) content. Wood was analyzed for its gross calorific value and its ash content. At 56 MAP, all species had less than 5% morality, except forA. holosericea, which had a mortality rate of 15.9%.A. indica andA. holosericea showed the highest stem diameter among species with 12.2 and 11.8 cm, respectively, at 56 MAP.A. senegal had the highest dry matter production with 22.3 t ha^–1 at 56 MAP, followed byA. indica (12.0 t ha^–1),A. holosericea (11.7 t ha^–1) andB. rufescens (11.2 t ha^–1), butA. holosericea was most productive at earlier harvests. OnlyA. senegal (6.4 t ha^–1) andA. indica (5.1 t ha^–1) had a significant wood production, whereasA. holosericea (5.7 t ha^–1) had the highest phyllodes production. Leaves ofA. senegal andA. indica had highest CP contents of 258 and 214 g kg^–1, respectively. The leaves of all species exceptA. gayanus had a higher CP:ME ratio than natural pasture in the region. The calorific values of firewood did not differ significantly among the species.A. nilotica, the species with one of the lowest firewood production, had the highest Fuelwood Value Index of 6.6. The choice of species for planting trees and windbreaks in the SSZ must be oriented along these criteria. Further research should be directed towards cost-benefit analyses, land tenure and property rights in combination with surveys on local knowledge of rural people.  相似文献   

台州市沿海围涂果园防护林效益调查研究   总被引：1，自引：0，他引：1  

柯孔明  何小广 《浙江林业科技》1996,16(4):67-70,74

沿海围涂果园，采用“窄带小网型”防护林营建技术，能降低风速３６．８％－７０．％，减少落果３８．２％－６０．５％，提高空气湿度１％－３％，减少蒸发量１３．７％〉改善果园生态环境，促进果树生长，从而提高产量，该技术宜于南方滨海果园推广。  相似文献   

马尾松速生丰产林营建技术的研究   总被引：2，自引：0，他引：2  

金国庆  夏建文 《浙江林业科技》1997,17(3):1-9

根据立地、遗传、密度3大因素控制的原则，营建马尾松速生丰产林，着重采取了选用良好的造林地、优良种源、合理整地、适当密植与培育容器苗造林5项主要技术措施，并在造林后3～4年内进行及时合理的幼林抚育。从幼龄林生长量测试结果表明：与国家速生丰产林专业标准相比较，1～5年生高生长量超标达31．8％～60．0％4～5年生胸径生长量超标达21．1％～24．0％，5年生材积生长量超标达368．0％，达到了预期的速丰林幼林期的培养目标。  相似文献