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- It is found particularly in pioneer weed species and in ecosystems such as the tundra, where insect vectors are rare. 研究发现这种现象主要存在于某些先锋植物物种和苔原生态系统中,因为那里传粉的昆虫很少。
- Cyperus rotundus, Kylling abrevitolia var. leiolepis, Cynodon dacrtylon and Euphorbia thymifolia were dominant and the most dangerous weed species. 香附子、光鳞水蜈蚣、狗牙根、千根草等9种杂草为优势种,也是重要的防除对象;
- Results show that there are 66 weed species of 28 families, mainly Compositae and Gramineae,found in the seed production field. 结果表明:该基地计有28个科、66种杂草,其中以菊科和禾本科最多;
- The superior weed species mainly included Viola yedoensis Makino, Geranium wilfordii Maxim, Taraxacum mongolicum Hand Mazz and Trifolium repens Linn. 优势种杂草主要有紫花地丁、老鹳草、蒲公英和白三叶等。
- Abstract: Its various physical environments and long geologic history made it abundant in weed species with complex floristic elements in Henan Province. 摘要:通过野外调查和资料分析,对河南不同类型农田杂草区系及生态分布特点进行研究。
- An investigation on weed species biodiversity and host plants of vesicular arbuscular mycorrhiza fungi (VAMF) within weed communities in new developed fruit gardens was conducted. 本研究调查了红壤坡地幼龄果园杂草群落的物种多样性以及主要物种被VA菌根真菌的侵染率和侵染强度,分析了VA菌根真菌侵染与根际土壤磷素水平的关系。
- Only one herbicide, isopropylamine salt of N-Phosphonomethyl glycine proved significantly to depress the colonization of Ageratum houstonianum, a dominant weed species in the experiment field. 本试验证实杀草剂年年春对于紫花藿香蓟有显著抑制菌根菌感染率的效果。
- The Galium aparine L. and the Veronica didyma Tenore and the Descurainia Sophia (L) schur and the Copsella bursa-pastoris (L) Medic and the Arenaria serpyllifolia L.are 5 superior weed species of wheat field in Guanzhong west area of Shaanxi. 猪殃殃、婆婆纳、播娘蒿、荠菜及蚤缀为陕西关中西部麦田5种主要优势种杂草,其发生面积大,危害普遍严重。
- Abstract The ragweed, Ambrosia artemisiifolia L., is one of the most hazardous weed species distributed worldwide and causing serious damages to agricultural production and human health. 摘要 豚草是世界性重要有害杂草之一,对农业生产和人类健康均造成严重危害。
- The allelopathic effects of V. villosa on the weeds varied with weed species in the descending order of speedwell > annual bluegrass > barnyard grass. 毛苕子水浸提液处理对杂草的化感效应因杂草种而异,对供试杂草的化感抑制强度为波斯婆婆纳>稗草>一年生早熟禾;
- Keywords Heavy Metals Polluted Soil Bioaccumulation Weed Species; 重金属;污染土壤;生物累积;杂草;
- He weed out one by one the book he do not want. 他把不想要的书一本一本丢掉。
- First thing tomorrow I'll weed the garden. 我明天一大早首先去除园内的杂草。
- We have to weed out unqualified applicants. 我们必须淘汰不合格的申请人。
- Do wolves belong to the canine species? 狼是犬科动物吗?
- We should do our best to save endangered species. 我们应该竭尽全力挽救濒于灭绝的生物。
- This rare bird has become an endangered species. 这种珍禽已成为濒临灭绝的物种。
- He was wearing a strange species of hat. 他戴着一种奇怪的帽子。
- The species is a cosmopolitan, naturalized weed. 本种是一根世界性,归化杂草。
- This species is a troublesome weed. 本种是一根令人讨厌的杂草。