河北省太行山区板栗低产原因及开发途径的探讨

河北省太行山区板栗生产上普遍存在的问题是产量低、品质差。本文对板栗低产原因进行了分析,为开发现有板栗资源,增产增值提出了切实可行的措施和途径。     

麦积山风景区蝗虫多样性研究

对麦积山风景区蝗虫多样性进行了初步研究,研究结果表明,麦积山风景区的蝗虫共有47种,分别隶属于7科32属。各科中属数最多的是丝角蝗科,占总数的43.75%,其次是斑翅蝗科,占总属数的21.88%;各科中种数最多的是丝角蝗科,占总数的42.55%,其次是网翅蝗科,占总数的17.02%,种数最少的是锥头蝗科,仅为1属1种,分别占总数的3.13%和2.13%。不同生境蝗虫种类存在一定的差异性,在阔叶杂木林、农田和草地3种生境中阔叶杂木林中蝗虫种类最多,占总种数的76.6%。从蝗虫区系多样性来看,景区蝗虫区系以古北界为主,占总种数的55.32%,其次东洋界的种类占到38.3%。     

高寒山区荒坡建立丰产苹果园试验成果初报

在威宁的高寒山区,经过采用撩壕整地、高标准栽植、引进红富士和新红星等新品种、加强病虫害管理等措施建立的苹果园,经过观测,提高了园地肥力,增强了保水保肥能力,促进了地上树体的发育,第3年结果植株达到70%,第4年达95%,第5年全部结果,株均产量3kg,第10年以后每hm2平均产量已达到7500～15000kg,达到了优质丰产的目的.     

Photosynthetic physio-response of Taxodium ascendens seedlings to different soil water gradients

Four different kinds of water treatments were applied to study the photosynthetic eco-physiological characteristics of Taxodium ascendens seedlings in the environment of the Three Gorges hydro-fluctuation belt. The four kinds of water treatments were: normal growth water condition (CK), light drought stress (T1), soil water saturation (T2), and soil submersion (T3). The results showed that different water treatments could effectively influence the content of the photosynthetic pigment, leaf gas exchange and apparent resources use efficiency of T. ascendens seedlings. It was also demonstrated that the T. ascendens seedlings could not only tolerate water submersion and wet conditions but also endure a certain degree of drought. To establish a protection forest system in the hydro-fluctuation belt in the Three Gorges Reservoir Area, the species T. ascendens is suitable for planting in conditions of root submersion or water-saturated soil. In case it is planted in drought conditions, this tree species should be watered appropriately in order to keep its normal net photosynthetic rate. Translated from Forest Research, 2006, 19(1): 54–60 [译自: 林业科学研究]     

广州地区草本花卉生产选种及栽培要点

结合广州地区气候特点,经过作者多年草花栽培经验,总结出草本花卉在本地区周年生产的品种及栽培要点。     

赣南地区杜鹃属植物资源及其保护利用

摘要：通过查阅文献资料结合实地调查研究,对赣南地区杜鹃属野生植物资源分布进行了统计分析。赣南地区杜鹃属植物共有32种（不包括种下等级）,隶属于映山红亚属、马银花亚属、常绿杜鹃亚属和羊踯躅亚属。根据生活型,赣南地区杜鹃属植物可分为灌木型和灌木与乔木兼有型;从垂直分布来看,赣南地区200~2000m海拔内均有杜鹃属植物分布,其中以500~1200m海拔高度种数最多;从水平分布来看,赣南地区各县市均有杜鹃属植物资源分布,主要集中在赣南地区的西南部和东部;从观赏和药用两个方面探讨了杜鹃属植物资源的价值,并提出杜鹃植物资源在赣南地区的合理保护利用措施。     

无线网在海洋渔业中的应用探讨

当今互联网迅猛发展，各行各业应用互联网进行信息化管理已成必然趋势。但是由于海洋渔业所涉及的面广、点多、点分散等特点，在应用互联网进行信息化管理方面有一定的困难。然而随着无线互联网的出现与普及，海洋渔业也能象其它行业一样越来越多地应用互联网，加快渔业信息化的进程。     

江西沟地区禾本科牧草引种试验

经过对早熟禾属(poa L.)、披碱草属(Elymus L.)的九种禾本科牧草在江西沟地区的生长情况、青干草产量及籽实产量的试验观测,筛选出了适于江西沟地区种植的牧草种类。     

四季草莓寒地高效栽培技术研究

利用四季草莓新品种‘四季公主2号’为试材,在吉林省开展四季草莓寒地高效栽培技术研究。结果表明,秋季定植四季草莓的产量和经济效益比春季定植的高,最佳定植时期8月10—25日;最佳栽培方式是平畦;春季采收后修剪使植株更新复壮,可提高草莓秋季产量和品质。     

You cannot conserve a species that has not been found: The case of the marine sponge Axinella polypoides in Liguria,Italy

1. Detailed knowledge about the distribution of species in need of protection is required for the management of Marine Protected Areas, a major tool to reduce marine biodiversity loss. Such knowledge is deficient for most marine invertebrates.
2. Axinella polypoides is a marine sponge included on the list of protected species by the Barcelona Convention (1976) and the Bern Convention (1987). This large and erect species has an important ecological role in habitat forming and benthic–pelagic coupling.
3. Bathymetrical, geographical and ecological data over the last 60 years were collated from publications and reports, together with new surveys to assess the distribution and protection status in Liguria of A. polypoides. It identified a more widespread distribution than previously thought, which points at a general need for dedicated investigations on the occurrence of species that require protection.
4. Bathymetrical distribution was trimodal, with peaks corresponding to different geomorphological settings: coastal cliff bases (around 38 m depth), inner shelf shoals (52 m) and rocks amidst coarse sediment on the outer shelf (79 m). Density was significantly greater at the shallowest depths. The species was mostly found in the coralligenous biocoenosis, in association with other characteristic species or forming a monospecific facies.
5. On (sub)vertical cliffs, A. polypoides often exhibited an unusual cane shape, rather than the typical bushy morphology, thus causing confusion with the congeneric A. cannabina, a more southern species. Records of the latter in the Ligurian Sea therefore need confirmation.
6. Only a minority (22.6%) of A. polypoides records were in Marine Protected Areas, the remainder being located in areas with no current environmental protection plans in place. While the occurrence of this species in MPAs remained stable over the decades, the only quantitative historical data available indicated that populations in non-protected areas were declining owing to anthropogenic impacts (fishing and anchoring).