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1.
早熟优质梨翠冠、清香、脆绿和西子绿引种试验 总被引：2，自引：0，他引：2
1 材料与方法 试验地设在文成县南田镇 ,海拔 630ｍ ,年均气温 14 9℃ ,降水量 190 0ｍｍ ,年日照时数 1750小时 ,无霜期 2 4 5天。从 1994年开始引种 ,在南田镇新星村高接和育苗。引进品种有浙江省农业科学院杂交育成的翠冠 (杭青×新世纪 )、清香 (新世纪×三花 )、脆绿 (杭青×新世纪 ) ,原浙江农业大学育成的西子绿 (新世纪× 71 3 55) ,同时以黄花梨 (黄蜜×三花 )做比较试验。高接在 8年生的黄花梨树上 ,每品种多头高接 5株 ,小苗砧木为豆梨 ,1995年栽培的株行距为 3ｍ× 4ｍ ,共 12 0 0株。后扩建引种园 ,株行距为2ｍ× 4ｍ ,到 … 相似文献
2.
红巴梨引种研究初报 总被引：2，自引：0，他引：2
红巴梨原产美国,系普通巴梨的红色芽变品种,除成熟果红色外,幼叶、幼果也均为红色。目前已在美国、新西兰、法国、澳大利亚等国推广栽培。山东省果树研究所自1987年4月由澳大利亚南澳州引入,当年以杜梨作砧木嫁接繁殖成苗5株,芽苗30株;1988年春将成苗定植于本所院内。接芽苗栽于本所试验场苗圃。现将4年试裁表现报告如下:1立地环境条件和栽培修理 土壤为沙壤土,中性偏酸,PH值6.9,有机质含量 1%左右,碱解氮 19 ×10-6( 19ppm)～43×10-6,速效磷21×10-6～34×10-6mg/kg,速效钾 32×10-6～68× 10-6。 栽植株行距 1. 25m× 4.5m,折合 666. 7m… 相似文献
3.
一、选育经过1977年我们选择了地理、生态、品种差异大的白梨系、秋子梨系、砂梨系的优良品种与苍溪雪梨进行杂交,22个杂交组合,共获种子3128粒,育出杂交实生苗856株.其中河北鸭梨×苍溪雪梨组合获得种子246粒,培育出实生苗77株,以3×2米的行株距定植于试验园.1985年开始结果,通过观察比较,苍梨5—51多种性状表现优良.当 相似文献
4.
黄花梨系浙江农业大学园艺系于１９６２年用黄蜜×义乌三花梨杂交育成，具有抗逆性强、早果丰产、果大质优、经济效益高等优点，深受经营者和消费者喜爱。８０年代发展２６６．６ｈｍ２，但因树体高大（树高４ｍ，冠径４．２ｍ×３．５ｍ），修剪不当，结果部位外移，产量... 相似文献
5.
晚熟梨新品种———爱宕梨刘成伊凯李俊才隋洪涛闫忠业孙丽梅王家珍许英武（辽宁省果树科学研究所熊岳１１５２１４）金炳奎（本溪市桓仁县林业局爱宕梨属砂梨系统，原产日本，是日本冈山县龙井种苗木株式会社推出的梨新品种，亲本为二十世纪×今村秋，１９８２年被日本农... 相似文献
6.
梨杂种果质量、耐贮性及果心大小的遗传倾向 总被引：5，自引：1，他引：5
果实大小、耐贮性及果心大小等是重要的梨果实性状。以龙香×早酥等4个组合的杂种后代为试材,研究梨在果重、耐贮性、果心大小等方面的果实性状遗传倾向。结果表明:梨的果重是受多基因控制的数量性状,杂种后代表现广泛的连续性偏小分布。基因效应为积加效应,并含有较大的非加性效应。梨后代果实的耐贮性呈明显的偏小分布,集中分布于30d以内,但有耐贮株系出现。梨后代果心大小遗传与组合类型有关,小果心出现的比例从高到低的组合类型依次为:小×小、小×中、大×中。 相似文献
7.
早熟优质梨新品种(优系)-翠冠、清香 总被引：1，自引：0，他引：1
翠冠、清香梨系浙江省农科院等单位分别以幸水×(杭青×新世纪)、新世纪×三花杂交育成,本所1993年秋引入.因其具有早熟、果型大、品质优、丰产性好、抗性强、果实成熟能避开台风侵袭等特点,近年来在温州各县迅速推广,果实一上市就受到消费者的宠爱,在南方地区有着良好的开发应用前景.现将两品种主要的优良性状简介如下. 相似文献
8.
梨树矮化密植栽培，具有结果早、产量高、品质好、效益高、更新品种快等优点。矮化栽培．是当今世界果树生产发展的总趋势。政和县石屯镇四津村的新厂自然村，于1993年种梨苗1300株，株行距3×2m或3×2.5m，1994～1995年小量挂果，但由于不整形，不修剪，放任生长冠内郁密，旺长，角度不开张，成花少，产量低。1995年冬我站介入，实行品种、修剪、土、肥水、保、工、管综合整治，1996年330株产果3435kg，1997年产果11550kg，平均株产35kg，并且二年好果率均在98％以上，取得较好的经济效益。一、以早熟黄花梨为主栽的种改发展早熟优质梨是当… 相似文献
9.
翠冠梨系省农科院园艺所以日本“丰水”×６号（杭青×新世纪）杂交育成。１９９６年我县引种翠冠１１１５万株，同时引入翠绿８００株、香绿２００株进行试种。三个品种互为授粉品种，分另栽种子山地和平原水稻田，以平地栽培为主进行观察。行株距４ｍ×２ｍ；三个品种间行或间株混栽。这些品种的早熟性和优良品质受到果农和消费者的关注，尤其对翠冠更为青睐，１９９９年平均株产２０ｋｇ，该品种特点是：（１）成熟早，６月底７月初已可食用，只是味稍淡，７月中下旬成熟，品质最佳，比黄花梨提早２０多天，比幸水梨早５～６天。（２）品… 相似文献
10.
湖北省襄阳县地处北纬３１°４６′～３２°２８′，东经１１１°４４′～１１２°２３′，属北亚热带湿润气候区。全县海拔高度在５１～４６０．５ｍ之间，地形起伏不平，耕地多为丘陵地。过去农业生产以粮棉油为主，为发展当地的水果生产，我们于１９８９年引进优质梨树... 相似文献
11.
Fruit cracking after rain limits the production of a number of crops, including some Ribes species. To gain a better understanding of the factors involved in cracking, fruit growth, deposition of the cuticular membrane (CM), water uptake and fruit cracking were studied in black currant (Ribes nigrum L. cv. Zema), gooseberry (Ribes uva-crispa L. cv. Rote Triumph), and jostaberry (Ribes nidigrolaria B. cv. Jostine). Fruit surface area and fresh mass increased continuously throughout development, whereas deposition of the CM was biphasic. CM mass per fruit increased rapidly up to 42, 41, and 49 days after full bloom (DAFB) in black currant, gooseberry, and jostaberry, respectively. Thereafter, CM mass per fruit remained constant in gooseberry and jostaberry or increased at a lower rate in black currant. The cessation of or reduced rate of CM deposition resulted in a decrease in CM mass per unit area in all berries. Elastic strain of the CM at maturity averaged 23.8% and 19.5% in gooseberry and jostaberry, respectively, and only 8.2% in black currant. Microcracks in the CM were observed first in gooseberry and jostaberry 64 DAFB, whereas there were no microcracks in black currant. Water uptake into mature detached berries was linear over 2 h of incubation. Rates of uptake were highest in gooseberry followed by black currant and jostaberry. Relative uptake was similar via the cut end of the pedicel (32.1%), the apex of the fruit (34.7%) and the fruit surface (33.2%). Rates of water uptake through the fruit surface were positively related to surface area. Average fruit water potential for black currant, gooseberry, and jostaberry was −2.14 ± 0.17, −1.24 ± 0.03, and −1.89 ± 0.20 MPa, while the permeability for osmotic water uptake was 7.7 ± 0.4 × 10−8, 5.2 ± 0.1 × 10−8, and 3.3 ± 0.3 × 10−8 m s−1. Incubating whole fruit in deionized water for 72 h resulted in more cracked jostaberries (94%) than black currants (74%) or gooseberries (50%). A comparison of our findings in Ribes berries with published data for the sweet cherry drupe revealed that the berries fitted the relationships established in sweet cherry among fruit growth, cuticle deposition, strain of the cuticle, microcracking, permeability for osmotic water uptake, frequency of stomata and cracking. The Ribes berries were less susceptible to cracking than sweet cherry. 相似文献
12.
Robert Rosen 《Landscape Ecology》1989,3(3-4):207-216
An exceptionally rich and colorful literature, drawn in almost equal parts from pure mathematics, from the sciences, and from the technologies, has grown up over the years, which bear in different ways on the topics under discussion. It is the intent of the present paper to survey this far-flung literature, point out some of the commonalities and interrelationships which underlie it, and briefly indicate how it has been and can be applied. To my knowledge, this kind of review has not been attempted before. 相似文献
13.
Wetlands, carbon, and climate change 总被引：3，自引：0，他引：3
William J. Mitsch Blanca Bernal Amanda M. Nahlik Ülo Mander Li Zhang Christopher J. Anderson Sven E. Jørgensen Hans Brix 《Landscape Ecology》2013,28(4):583-597
Wetland ecosystems provide an optimum natural environment for the sequestration and long-term storage of carbon dioxide (CO2) from the atmosphere, yet are natural sources of greenhouse gases emissions, especially methane. We illustrate that most wetlands, when carbon sequestration is compared to methane emissions, do not have 25 times more CO2 sequestration than methane emissions; therefore, to many landscape managers and non specialists, most wetlands would be considered by some to be sources of climate warming or net radiative forcing. We show by dynamic modeling of carbon flux results from seven detailed studies by us of temperate and tropical wetlands and from 14 other wetland studies by others that methane emissions become unimportant within 300 years compared to carbon sequestration in wetlands. Within that time frame or less, most wetlands become both net carbon and radiative sinks. Furthermore, we estimate that the world’s wetlands, despite being only about 5–8 % of the terrestrial landscape, may currently be net carbon sinks of about 830 Tg/year of carbon with an average of 118 g-C m?2 year?1 of net carbon retention. Most of that carbon retention occurs in tropical/subtropical wetlands. We demonstrate that almost all wetlands are net radiative sinks when balancing carbon sequestration and methane emissions and conclude that wetlands can be created and restored to provide C sequestration and other ecosystem services without great concern of creating net radiative sources on the climate due to methane emissions. 相似文献
14.
J. Van Bragt 《Scientia Horticulturae》1982,17(2):199
15.
Harold S. J. Zald Thomas A. Spies Manuela Huso Demetrios Gatziolis 《Landscape Ecology》2012,27(8):1197-1212
Tree invasions have been documented throughout Northern Hemisphere high elevation meadows, as well as globally in many grass and forb-dominated ecosystems. Tree invasions are often associated with large-scale changes in climate or disturbance regimes, but are fundamentally driven by regeneration processes influenced by interactions between climatic, topographic, and biotic factors at multiple spatial scales. The purpose of this research was to quantify spatiotemporal patterns of meadow invasion; and how climate, larger landforms, topography, and overstory trees have interactively influenced tree invasion. We combined airborne Light Detection and Ranging (LiDAR) characterizations of landforms, topography, and overstory vegetation with historical climate, field measurements of snow depth, tree abundance, and tree ages to reconstruct spatial and temporal patterns of tree invasion over five decades in a subalpine meadow complex in the Oregon Cascade Range, USA. Proportion of meadow occupied by trees increased from 8?% in 1950 to 35?% in 2007. Larger landforms, topography, and tree canopies interactively mediated regional climatic controls of tree invasion by modifying depth and persistence of snow pack, while tree canopies also influenced seed source availability. Landscape context played an important role mediating snow depth and tree invasion; on glacial landforms tree invasion was negatively associated with spring snowfall, but on debris flows tree invasion was not associated with snow fall. The importance of snow, uncertain climate change impacts on snow, and mediation of snow by interacting and context dependent factors in complex mountain terrain poses substantial hurdles for understanding how these ecotones may respond to future climate conditions. 相似文献
16.
Ralph E. J. Boerner 《Landscape Ecology》2012,27(8):1235-1236
17.
AIM: To detect the treatment of K562 leukemia cells with bortezomib altering the expression of genes fas, bcl-2, bcl2l12, bim, bax, caspase-9 and caspase-3.METHODS: MTT assay was used to detect the inhibition of proliferation. Apoptosis was detected by Annexin-V staining and mitochondrial transmembrane potential (Δψm). RT-PCR was used to analyze the mRNA expressions of fas, bcl-2, bcl2l12, bim, bax, caspase-3 and caspase-9.RESULTS: Bortezomib caused a time- and dose-dependent inhibition of cell proliferation and IC50 of 24 h and 48 h were 161.41 nmol/L and 96.33 nmol/L, respectively. At the concentration of 104 nmol/L, bortezomib induced apoptosis in a time-dependent manner, including increasing annexin-V positivity and decreasing the Δψm. RT-PCR showed that bortezomib up-regulated the mRNA expression of fas, bcl2l12, caspase-9 and caspase-3, but mRNA expressions of bcl-2, bim and bax did not changed obviously.CONCLUSION: Bortezomib inhibits the proliferation of K562 and induces apoptosis, in which fas, bcl2l12, caspase-9 or caspase-3 gene is one of the main genes taking part in. 相似文献
18.
K.C. Sink 《Scientia Horticulturae》1978,8(1):91-92
19.
氮磷钾硼肥配施对青花菜养分吸收分配及产量和品质的影响 总被引：4，自引：0，他引：4
研究了不施肥处理,氮磷钾配施和增施硼肥对青花菜养分吸收分配及产量和品质的影响。结果表明,现蕾期至花球膨大期,青花菜对氮、磷、钾的吸收量最大,整个生长期对钾的吸收最多,氮次之,磷最少。氮磷钾主要分配在叶片中,现蕾后逐渐向花球转移,从现蕾到采收时,叶片中氮、磷、钾分配率分别降低了19.6%、10%和9.0%,花球中氮磷钾分配率分别提高了23.1%、15.9%和11.1%。不施氮、磷、钾肥显著降低了花球产量、维生素C含量和成品率,增施硼肥处理的花球成品率较氮磷钾肥处理提高了4.8%,不施氮肥和钾硫肥(K2SO4)显著降低了花球中的硫代葡萄糖苷含量。相关性分析表明,青花菜产量与植株内氮、钾积累量显著正相关,成品率与植株内磷营养显著正相关。 相似文献
20.
August De Hertogh 《Scientia Horticulturae》1974,2(4):313-355
Systematic investigations on the forcing of tulips, hyacinths, daffodils, Easter lilies and Dutch iris have produced a fairly complete set of scientific principles. In this review, these principles have been classified into a 3-phase concept of forcing. These are: production, programming, and greenhouse. The production phase is defined as all processes which occur during bulb production and it terminates with the harvesting of the bulbs. The programming phase comprises all handling of the bulbs from harvesting until they are placed under greenhouse conditions. The greenhouse phase is the accelerated development of the bulbs until anthesis or marketing of the plants. These phases have been discussed relative to floral and root development and the basic environmental requirements of the bulb species. 相似文献