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白世印!沈阳市青年大街药王庙路号楼号 《吉林蔬菜》2000,(4)
近一段时间陆续收到大量读者来信，或询问栽培形式及效益，或问香椿树苗如何引进，因工作量较大，现统一作答： 香椿品种较多，在可入菜食用的品种中，黑油香椿香味最浓，脆嫩多汁，油脂含量高，味甜无渣，生食无苦味，适平原地区零星栽植。红香椿的特点也是味甜、香气浓、多汁脆嫩，腌制后风味更佳。红香椿较耐低温，比较适合大棚栽培。从东北气候特点及冬春反季节栽培摸索到的经验来看，红香椿栽培更适合东北地区。萌萌红香椿在东北已经是第四个年头，从各方面表现来看都不错。不仅矮化易控制，分枝也较好，产量也高。今年秋天沈阳萌萌新… 相似文献
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日光温室香椿生产品种来源是红香椿和绿香椿。早育苗、培育壮苗是夺取香椿优质高产的关键。阳畦育苗，矮化处理，假植栽培，高密度土培，打破休眠，温湿度调控，是日光温室无公害香椿高产栽培的技术环节。通过苗木的出棚及再利用，可进行日光温室无公害香椿的周年生产，周年供应。 相似文献
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菜用香椿设施栽培技术刘向东，王轶，于海成（河北农技师范学院园艺系）香椿原产我国，属多年生木本蔬菜，不但可以食用、材用，还能入药，具有很高的经济价值。目前，香椿栽培还远远不能满足市场需求。因此研究香椿的设施栽培技术有很高的实用价值。一、香椿的特征、特性... 相似文献
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为比较不同波长光照对香椿采后贮藏期间品质的影响，本文以5种不同单色发光二极管（lighting-emitting diode,LED）光质（白光、红光、黄光、蓝光、绿光）在4℃的光照培养箱中照射香椿，测定香椿的感官品质、失重率、色差、维生素C含量、可溶性固形物和还原糖含量。结果表明，不同单色LED光照均能减缓香椿贮藏过程中营养品质下降的速度。其中，经红光LED照射的香椿，感官评分65、水分含量80.35%、还原糖含量1.31 mg/g、VC含量0.09 mg/g、可溶性固形物含量2.96%，在不同单色LED光照射处理组中效果最好。因此，红光LED照射对香椿贮藏品质的保持效果最佳。 相似文献
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香椿贮藏保鲜技术的研究 总被引：2，自引：0，他引：2
我国食用香椿久已成习，汉代就已遍布大江南北。作为苯类，香椿芽尤以春季色香味浓。采摘露地香椿芽多在清明至谷雨期间，此时，香椿芽从萌动到长出半月有余，质嫩无筋，香味浓。随着人民生活水平的提高，广大消费者对香椿的食用需求越来越大，而目前香椿生产多为分散经营，没有形成规模，给香椿的加工带来广阔的前景。通过对香椿的保鲜处理及深加工，可缓解香椿在春季集中上市的压力，进行反季节销售，实现香椿产品的四季供应，扩大市场份额，创造可观的经济价值。[编者按] 相似文献
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香椿种子采收与贮藏技术香椿种植面积在逐年扩大，对香椿种子的需求量也在连年增加。而有些农户反映，“种了几十年香椿树，从未见过香椿开花结子”。下面就向广大农户介绍香椿种子的采收与贮藏技术。香椿树幼树不能开花结籽，当树龄达７～８年时开始开花结果。适龄香椿树... 相似文献
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日光温室香椿栽培技术齐心，唐志文，生国辉（吉林省蔬菜花卉研究所）（吉林市九站乡蔬菜园艺站）香椿，又名猪椿、香椿叶，属楝科落叶乔木，是优质木本蔬菜。树皮可做香料，树干是高级木料。香椿性味苦、温、无毒，具有涩肠止血．、固精等作用。香椿嫩芽有良好的营养价。... 相似文献
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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
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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
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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
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Ralph E. J. Boerner 《Landscape Ecology》2012,27(8):1235-1236
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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
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This paper is based on interviews with fifteen professionals within ecology, forestry and park and landscape architecture. The interviewees are believed to have had a large influence on woodland planning in Sweden between 1950 and 2000. They have won recognition because of their ability to transform theoretical knowledge into practical action. Their work is translating theory into practice and, as such, it may be regarded as art in its deepest sense. During a long period the educational system as well as the dominating research has been concentrating on providing better facts in a search for the best knowledge, high degrees of generality and objectivity. However, this may cause many disadvantages. It has lead to a standardisation and an oversimplification of knowledge and thereby also to an oversimplification of the landscape. This study is based on a humanistic approach, on theory of knowledge, of how facts coming from the world of natural sciences can be encapsulated in daily woodland management. 相似文献
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Landscape Ecology, Cross-disciplinarity, and Sustainability Science 总被引：6，自引：16，他引：6
Jianguo Wu 《Landscape Ecology》2006,21(1):1-4
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Richard E. Toth 《Landscape Ecology》1988,1(4):193-201
A soft paradigm for landscape analysis is presented. This paradigm focuses on the analysis of function first, and then on structure. The objective is to determine which factors are operationally significant, how these factors bring about change, and how they define the spatial characteristics of landscapes. 相似文献
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Road Density and Landscape Pattern in Relation to Housing Density,and Ownership,Land Cover,and Soils 总被引：5，自引：0，他引：5
Roads are conspicuous components of landscapes and play a substantial role in defining landscape pattern. Previous studies
have demonstrated the link between roads and their effects on ecological processes and landscape patterns. Less understood
is the placement of roads, and hence the patterns imposed by roads on the landscape in relation to factors describing land
use, land cover, and environmental heterogeneity. Our hypothesis was that variation in road density and landscape patterns
created by roads can be explained in relation to variables describing land use, land cover, and environmental factors. We
examined both road density and landscape patterns created by roads in relation to suitability of soil substrate as road subgrade,
land cover, lake area and perimeter, land ownership, and housing density across 19 predominantly forested counties in northern
Wisconsin, USA. Generalized least squares regression models showed that housing density and soils with excellent suitability
for road subgrade were positively related to road density while wetland area was negatively related. These relationships were
consistent across models for different road types. Landscape indices showed greater fragmentation by roads in areas with higher
housing density, and agriculture, grassland, and coniferous forest area, but less fragmentation with higher deciduous forest,
mixed forest, wetland, and lake area. These relationships provide insight into the complex relationships among social, institutional,
and environmental factors that influence where roads occur on the landscape. Our results are important for understanding the
impacts of roads on ecosystems and planning for their protection in the face of continued development. 相似文献