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invasion weeds
相关语句
  入侵杂草
     The investigation on the the harm and prevention strategies of the exot invasion weeds in the Guangzhou White Cloud Mountain
     外来入侵杂草对广州市白云山的危害及其防治策略的探讨
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  “invasion weeds”译为未确定词的双语例句
     In this paper,the main species,the harm and prevention strategies of the exotic invasion weeds in the White Cloud Mountain have been studied.
     本文分析了广州市白云山风景区分布的有害外来杂草的种类及对风景区产生的危害 ,并对如何防治的策略进行了初步的探讨。
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  相似匹配句对
     Invasion;
     侵袭;
短句来源
     The Invasion
     入侵
短句来源
     Pasture Introduction and Exotic Weeds Invasion
     牧草引种与外来杂草入侵研究
短句来源
     FORMATION OF WEEDS
     杂草的形成
短句来源
     Approach to Weeds
     走进《野草》
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Ajania tenuifolia is one of the main species of invasion weeds on artificial Elymus nutans grassland in Haibei. For the sake of proving that the relationship of allelopathy exists in the natural degeneration process of artificial E.nutans grassland, the experiments of intrespecific inhibitory effect of E. nutans interspecific inhibitory and stimulated effects between E.nutans and Ajania tenuifolia)inhibitory effects of various metabolites of A. Tenuifolia on the seeds germination and seedling growth of...

Ajania tenuifolia is one of the main species of invasion weeds on artificial Elymus nutans grassland in Haibei. For the sake of proving that the relationship of allelopathy exists in the natural degeneration process of artificial E.nutans grassland, the experiments of intrespecific inhibitory effect of E. nutans interspecific inhibitory and stimulated effects between E.nutans and Ajania tenuifolia)inhibitory effects of various metabolites of A. Tenuifolia on the seeds germination and seedling growth of Elymus nutans have been carried out,, the results are as follows.1. The experimental results of intraspecific inhibitory effect of E. nutans showed that when the sowing densities raised from 0.2g/p.d to 0.4,0.6 and 0.8g/ p.d, the germination rales of seeds were reduced by 28.2, 34.9 and 39.6%,respectively, the germination time of 50% seeds was delayed by 5,20 and 30 hours respectively.2. The experimental results of interspecific inhibitory and stimulated effects of Ajania tenuiolia on seeds germination and seedling initial growth of Elymus nutans showed that when the mixed amount of Ajania tinuifolia seeds was 0.1g/p.d, compared with contrast, the germination rate of Elymus nutans seeds was reduced by 32.8%, their seedling height and root length were reduced by 10.9 and 4.5mm respectively. When the mixed amount of Elymus nutans seeds was 100/p.d, compared with contrast the germination rate of Ajania tenuifolia seeds could be raised by 3 times.3. The experiments results of inhibitory effects of Ajania Tenuifolia various metabolites on seeds germination and seedling growth of Elymus nutans showed that after the secretion of germinating Ajania tenuifolia seeds was separated into three parts by polyamide and XAD-4 resin. It was noticed that, the XAD-4'fraction had stronger inhibitory effect on seeds germination and seedling initial growth of E.nutans.The roots exudats of Ajania tenuifolia which was collected by XAD-4 rasin also has inhibitory effect.on the seedling initial growth of E. nutans. The volatile oil Ajania tenuifolia has strong inhibitory effect on the seeds gemination of Elymus nutans.All above rsults proved that the relationship of allelopathy in the natural degeneration process of artificial E.nutans grassland is entirely possible.

细叶亚菊是海北地区垂穗披碱草人工草场上主要入侵杂草之一。本文探讨了垂穗披碱草和细叶亚菊草种间抑制与促进作用以及细叶亚菊各种代谢产物对垂穗披碱草种子萌发与幼苗生长的抑制作用。实验表明:在垂穗披碱草人工草场自然退化过程中存在着生化他感作用。牧草的自然退化速度与主要杂草入侵程度呈明显的相关性。

The relationship between weed invasion and intensity was analysed on sown pasture mixed by whiteclover and perennial ryegrass,and the preliminary results were that 1)the number of invasive weeds ismainly dependent on grazing intensity;2)the trend of species diversity was successively increase-decrease-increase when the grazing intensity is increase;3) principal invasion weed species are Lysimachiahemsleyana, Eragrostis nigra, etc,8 species;4)the sown pasture in question is pioneer stage...

The relationship between weed invasion and intensity was analysed on sown pasture mixed by whiteclover and perennial ryegrass,and the preliminary results were that 1)the number of invasive weeds ismainly dependent on grazing intensity;2)the trend of species diversity was successively increase-decrease-increase when the grazing intensity is increase;3) principal invasion weed species are Lysimachiahemsleyana, Eragrostis nigra, etc,8 species;4)the sown pasture in question is pioneer stage of the recoverysuccession,therefore the retrograssive course of pasture can be hold back.

本文分析了白三叶草十多年生黑麦草混播人工草地上杂草入侵与放牧强度之间的关系,得出如下初步结论:1)杂草入侵的种数主要决定于放牧强度;2)α物种多样性随放牧加重而有增-减-增的趋势;3)入侵的主要杂草种为点腺过路黄等8个种;4)所论人工草地都处在恢复演替的先锋阶段,因而草地退化的进程还是能予以遏制的。

In this paper,the main species,the harm and prevention strategies of the exotic invasion weeds in the White Cloud Mountain have been studied.

本文分析了广州市白云山风景区分布的有害外来杂草的种类及对风景区产生的危害 ,并对如何防治的策略进行了初步的探讨。

 
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