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园林苗木的整形修剪的方法 总被引：1，自引：0，他引：1
整形修剪能培养出理想的主干,丰满的侧枝,圆满、匀称、优美的树形。通过整形修剪能使植物按照人们设计好的树形生长发展,有利开花结果;改善苗木的通风透光条件,减少病虫害,苗木健壮,质量提高;整形修剪可使植株矮化。园林苗木的整形修剪方法主要有抹芽、摘心、短截、疏枝、拉枝、刻伤、环割与环剥、劈枝等。 相似文献
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一、乔木的整形与修剪的概念 整形是通过修剪树木枝条，如：剪、锯、捆、绑、扎等手段，使树木生长成栽培者所希望的特定形状。修剪就是在整形的基础上，对树木的某些器官(枝叶、花等)加以疏删短截，以达到调节生长，开花结实的目的。整形、修剪是两个紧密联系的操作技术，常常结合在一起进行。一般来说，整形着重于幼树及新植乔木，修剪则贯穿于树木一生中。 相似文献
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如何对园林绿化树木进行修剪养护 总被引：6，自引：0，他引：6
园林树木修剪的主要内容是对园林树木在生长期内进行整形和修剪。整形是树木在幼年期为了形成一定树形而进行的树体生长调整工作。修剪是指树木成形后的修剪,其目的是为了维持和发展这一既定的树形,同时也包括对自然生长树木的树形改造. 相似文献
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我国是苹果生产国,在东北、华北、华东、西北和四川、云南等地均有栽培。果树的整形修剪在提高苹果单产、解决大小年问题上有着至关重要的作用。本文探讨如何对苹果树进行正确适当的整形修剪问题,为栽培苹果树的果农提供参考。 相似文献
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《中国科学院院刊(英文版)》2008,22(1):2-3
CAS should stick to the principle of rendering service to, and giving impetus for, the development of China＇s science enterprise by making S＆T innovations, said CAS President LU Yongxiang. The CAS president made the remarks in a recent talk to communicate the gist of the winter session of the Party＇s Leading-member Group at CAS, which was held from 7 to 11 January in Beijing. 相似文献
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《中国科学院院刊(英文版)》2008,22(1)
With great care, Dr. ZHOU Zhonghe takes out a package wrapped by cotton tissue from a drawer and says: "This is the gem of our collections: the fossil of a bird that lived 125 million years ago!" Then, pointing at a tiny mound, he explains: "Look, this is the claw and that is the head. It was in the egg shell and ready to hatch ... The species fell into a family of waterside inhabitants." 相似文献
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Prof. SUN Changpu from the CAS Institute of Theoretical Physics coworkers from University of Basel in Switzerland have worked out a way - at least in theory - to split a beam of molecules according to their chirality. The technique involves passing the molecules through three different laser beams is similar to the famous Stern-Gerlach effect whereby a beam of atoms passing through a magnetic field is split in two according to the atoms' spin states 《中国科学院院刊(英文版)》2008,22(1):23-23
Prof. SUN Changpu from the CAS Institute of Theoretical Physics and coworkers from University of Basel in Switzerland have worked out a way --at least in theory --to split a beam of molecules according to their chirality. The technique involves passing the molecules through three different laser beams and is similar to the famous Stern-Gerlach effect, whereby a beam of atoms passing through a magnetic field is split in two according to the atoms＇ spin states （Phys. Rev. Lett. 99 130403）. 相似文献
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《中国科学院院刊(英文版)》2014,(3):212-213
<正>In February 2014,the 30th Chinese Antarctic inland expedition team reported that they have successfully conducted the seeing measurement at the Antarctic Taishan Station using a Differential Image Motion Monitor(DIMM)developed by the Nanjing Institute of Astronomical Optic and Technology(NIAOT),Chinese Academy of Sciences.In astronomy,seeing is a physical parameter that describes the irregular movement and blur of the star 相似文献
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XIN Ling 《中国科学院院刊(英文版)》2014,(4):270-271
Amassive overhaul is coming to the Chinese Academy of Sciences （CAS）. To straighten its ＂fragmented, inefficient research＂, the academy has decided to restructure its 104 institutes for better teamwork. 相似文献
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SONG Jianlan 《中国科学院院刊(英文版)》2014,(4)
<正>DNA demethylation in mammalian zygotes,a biochemical process through which the parental genomes let go the epigenetic marks from their"past lives"to obtain totipotency,has long fascinated biologists:how does it happen?A joint team at the CAS Shanghai Institutes for Biological Sciences tells a surprising story. 相似文献
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China is one of the fastest growing economies worldwide. Are science and research also in the fast lane? We talked with LUO Yuan, scientist at the Institute of Coal Chemistry in Shanxi, and Axel Mosig, Professor at Ruhr University in Bochum, who has first-hand experience working and living in China. 相似文献
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INS 《中国科学院院刊(英文版)》2014,(4):311-311
Neonatal heart:Largely,postnatal coronary vessels might not have expanded from preexisting embryonic vasculature as formerly believed–see what CAS biologists revealed in page 311. 相似文献
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《中国科学院院刊(英文版)》2014,(4):312-312
<正>Recently a group of researchers at the unit of molecular virology,Institut Pasteur of Shanghai,Chinese Academy of Sciences revealed a new mechanism to regulate the survival of influenza A virus and reported their discoveries in the Journal of Virology on July 相似文献
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《中国科学院院刊(英文版)》2014,(4):319-320
<正>Amber-bearing deposits are among the most important Konservat-Lagersttten providing unique windows into past ecosystems.Fushun amber has been known for over a century and was traditionally regarded as an important source of medicine as well as organic gemstones.The inclusions,however,were not the subject of any comprehensive investigation 相似文献