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胡桃楸直播造林成败的关键在于种子处理。对整地方法、造林技木、苗期抚育等主要技术环节进行了较为系统的研究,并提出一套行之有效的实施方法。 相似文献
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本文对金丝楸特性以及用途广泛的作用进行叙述,通过本企业自身的优势条件,提出了种植金丝楸的可行性以及具体保障实施的措施和方法。 相似文献
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近年来,东北地区林业部门探索出一套人工营造核桃楸林的技术,为经济建设、社会发展以及生态工程提供了重要的树种和木材.本文就是基于核桃楸繁育和养护实际经验,在总结和分析核桃楸人工林造林经验的基础上,提出了采种、整地、幼林抚育和病虫害防治等核桃楸人工林造林关键工作的技术要点,希望为东北地区更快地扩大核桃楸林覆盖面积,更有效地提高核桃楸人工林营造质量,更高地提升核桃楸的产出做出技术上的总结和积累. 相似文献
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洪德元 《中国科学院研究生院学报》1984,22(3):181-184
Echicocodon Hong (Wahlenbergieae); Gen. nov.
Calyx 2-5-saepe 4-fidus; lobis utrinque 2-4-lobulis spiniformibus praeditis. Corolla tu-
bulosa; ad medium parterm (3-) 4 (-5)-lobata. Stamina (3-) 4 (-5); libera; sed inter
se eonniventia; filamentis basi parum expansis. Ovarium fere inferum; 3-5-1oculare; stig-
mata 3-5; demum recurva; linearia; ovula ∞. Capsula globosa; 3-5-locularis; spice locu-
licide dehiscens; valvis calycis lobis alternantibus. Semina ∞ ; minima; ellipsoidea; obtuse tri-
quetra.——Herbae perennes; lactesentes; radicibus palaribus crassiusculis. Folia alterna; pin-
natipartita. Flores solitarii terminalesque vel 2-3 in cymam conferti.
Genus monotypicum; in provincia Hubei Sinae cresens.
Typus generis: Echinocodon lobophyllus Hong.
Echinocodon lobophyllus Hong; sp. nov. plate 1
Herbae diffusae; omnino glabrae; radicibus palaribus ad 5 mm crassis. Caulis ad 40 cm
longus; ramosissimus. Folia alterna; petiolis 5-10 mm longis; laminis ellipticis; 5-20 mm
longis; 3-15 mm latis; basi anguste cuneatis; apice obtusis; pinnatisectis vel ad medium
pinnatipartitis.
Flores solitarii terminales vel 2-3 in cymam conferti; pedicellis 1-5 cm longis. Caly-
cis lobi ovato-lanceolati; 2-6 mm longi; lobulis spiniformibus exclusis 1-3 mm lati. Corol-
la purpureo-caerulea; tubulosa; 3-4.5 mm longa; ad medium (3-)4(-5)-lobata; lobis la-
te ovato-diltoideis; ad 3 mm latis. Stamina inter se conniventia; filamentis liberis; 1.5 mm
longis; basi expansis; ciliatis; antheris oblongis; 1 mm longis. Stylus 1 mm longus; stigmata
linearia; demum recurva. Capsula globosa; 3-5 mm diam.; sed parte supera conica et 2 mm
longa. Semina minima; luteo-fusca; ellipsoidea; obtuse triquetra; 0.3 mm longa.
China: Hubei Province; Yunxi County; near the town; 300 m alt.; 1 Jul. 1983. Ma Yu-
an-jun and Hong De-yuan PB83006 (holotype; PE); the same locality; 11 Jul. 1978; Ma
Yuan-jun 3921.
The new genus; Echinocodon Hong; shows its systematic position in the tribe Wahlen-
bergieae by the inferior ovary and capsule which loculicidally dehisces above the calyx and
is closely related to the genera Codonopsis; Platycodon and Wahlenbergia; from all of which
it differs in having the calyx lobes with spinelike lobules and the pinnatisect or pinnatipar-
tite leaves. From Codonopsis it differs also in having the linear stigma lobes; from Platyco-
don also in the capsule valves alternate with the calyx lobes and from Wahlenhergia also in
having the 4(5)-colpate pollen grains.
Meiosis in pollen mother cells was examined and; 8 bivalents in MI and 8 chromoso-
mes in MII were always observed (Plate 2: 1-2). The chromosomt number is thus de-
termined to be n=8.
The pollen grains taken from the flowers which were fixed in the fields with Carnoy
II fixative (6:3:1 absolute alcohol/chloroform/glacial acetic acid) were examined without
further treatment under SEM; and under LM after acetolysis. The result shows that they
are oblate; 4(5)-colpate (Plate 2: 3-4); with colpi 10.5μm long and 2.5μm wide and
with a smooth colpus membrane (Plate 2: 5). The exine is 2-layered; with a distinct bacu-
late layer (Plate 2:7-8). The sexine surface is covered with spinules almost regularly spa-
ced; 0.6μm high and basally divided. The sexine between spinules consists of short ridges
(Plate 2: 6).
The new genus is closely related to the genera Codonopsis; Wahlenbergia and Platyco-
don from gross morphological point of view; but its pollen grains differ markedly from
all of them. The pollen grains in Codonopsis are longly 5-colpate; and with the sexine consis-
ting of a low relief reticulum; those in Platycodon longly 5-colporate and those in Wahlen-
bergia 3-porate. The pollen type of the new genus Echinocodon with short colpi is therefore
probably derived from the longly colpate type of pollen like that of Codonopsis or directly
from longly colporate type like that of Platycodon; and is likely more primitive than thatin Wahlenbergia. 相似文献
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近年来，冀中能源股份有限公司显德汪矿纪委着力推进权力运行监控杌制建设，以“三重一大”事项为权力监控的重点，全力打造“赦力防控链条”，构建了从事前预防到内部制约，从全程监督监控到事后问责追究四大体系。抓好了9个小机制的建设落实，并细化为二十余项具体的防控举措，形成了体系清晰，权责分明的权力运行监督防控链，收到了良好效呆。 相似文献
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旨在通过对于数字光纤通信技术的优势分析和现状研究,通过阐述C4I的具体应用来分析数字光纤通信系在军事中的具体应用实例,明确数字光纤通信在军事通信中的作用和地位来阐明其在智能军事指挥中的具体应用。 相似文献
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介绍了I2C总线的基本原理.详细分析了I2C总线死锁现象产生的原因,提出了总线死锁恢复的各种解决方法.并就每一种方法进行了仔细的研究,比较了各种方法的优点以及局限性,对I2C总线可用性设计提出了指导. 相似文献
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本文结合仿真I2C实例介绍了Proteus仿真图表的使用方法。在单片机教学过程中可以使学生深刻了解单片机时序，辅助教学。 相似文献
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陈艺林 《中国科学院研究生院学报》1989,27(5):395-404
In the paper four new species of the genus Impatiens (Balsaminaceae) are des-
cribed from China. They are Impatiens fenghwaiana Y. L. Chen, I. wuyuanensis Y. L. Chen,I. jinggangensis Y. L. Ghen, and 1. hunanensis Y. L. Chen. 相似文献
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Career progress in centralized academic systems: Social capital and institutions in France and Italy
We analyze the role of social capital in academic careers. We distinguish between ties with reputed scientists and laboratories (scientific and technical human capital) and ties with influential actors with respect to recruitment/promotion decisions (political capital). We use institution-wise bibliometric indicators to measure separately the two types of capital for a large sample of French and Italian academic physicists between 2000 and 2003/2005. Controlling for scientific productivity, seniority and gender issues, career progress is explained by: the scientist's affiliation to important public research organizations (scientific and technical human capital - France); his/her social ties with senior members of the discipline, who exercise control over careers (political capital - Italy), and the commitment to work with senior colleagues in his/her own university (political capital - Italy). Significant differences exist between the two countries also with respect to the importance of productivity, seniority, and gender. 相似文献