排序方式: 共有27条查询结果,搜索用时 31 毫秒
11.
中草药具有药源丰富,作用广泛,标本兼冶,安全低毒,不易产生耐药性,无污染、无残留等优点;同时还能提高家禽的生产性能,改善肉、蛋品质,从而提高养禽业的经济效益,因而在养禽业上有着广泛的应用前景。虽然中草药也有其弱点,但却始终阻碍不了中草药向前发展的步伐。 相似文献
12.
13.
Strategic studies on the biodiversity sustainability in Yunnan Province, Southwest China 总被引:1,自引:0,他引:1
Pu Ying-shan Zhang Zhi-yi Pu Li-na 《中国林学(英文版)》2007,9(3):225-237
With an area of 394,000 km2 (4.1% of China's total area) and specific diversified geographical environments, Yunnan houses over 18,000 species of higher plants (51.6% of China's total), 1,836 vertebrate species (54.8% of China's total) and multitu-dinous species of rare, endemic and epibiotic wildlife, ranking first in species richness value and endemicity rate of China's biodiver-sity, thus becoming a rare gene bank of wildlife species with the most concentrated distribution of important wildlife taxa and a key terrestrial biodiversity region of global significance. Despite its evident abundance and endemism, however, the biodiversity is faced with threats of ecological fragility and human disturbances in socioeconomic development resulting in attenuation of biodiversity, degradation of ecosystems and serious loss of species, thus, it needs to be carefully studied for its sustainability. Based on the analy-ses of the geographical diversity, the macro material bases of Yunnan's biodiversity were reviewed and six characteristics of the pro-vincial biodiversity were described in the ecosystems, forest types, species compositions, endemic species, genetic resources, etc. By appraising the present status of the provincial biodiversity conservation, the facts that the biodiversity coexisted with fragility were revealed so that eight key disadvantageous factors in the provincial ecological fragility causing serious biodiversity loss were sum-marized and described in this paper. In order to satisfy the two-fold needs of biodiversity sustainability and socioeconomic develop-ment, eight strategies for the sustainable development were intensively elaborated by borrowing certain theories in modern conserva-tion biology, recycling economics and some successful innovations, and by giving comprehensive consideration to the ecological fragility mechanism, nature reserve construction, environmental protection and the exploitability of resources for biodiversity sus-tainability and socioeconomic development. Accordingly, relevant targets, principles, tactics and measures for effective biodiversity conservation and sustainability were suggested to lay a solid theoretical foundation and reliable scientific basis for the biodiversity and socioeconomic sustainable development. 相似文献
14.
Agrow Reports杂志的产品负责人Philip Jarvis认为在日益萎缩的除草剂市场新产品开发仍存在机遇。2004年9月在荷兰阿姆斯特丹召开的IBC生命科学与农化研讨会上,他认为近期的除草剂开发仍以针对草甘膦防治特殊弱点的后期产品为主,并在近几年持续这种状况。 相似文献
15.
16.
分析、措施到位,保证同业对标的计划可行
同业对标工作的第一个重要环节是进行指标、数据比较分析。因此,分析现状,寻找薄弱点和潜力点,对自身的状况有一个正确、充分的了解是我们工作的立足点。一是寻找差距和薄弱点。根据同业对标综合评价体系,我们对2004年指标完成实绩和2005年的指标计划完成值进行了反复分析,专题研究。将综合评价中的74个项目和未列入综合评价体系的2个同业对标项目分别逐项下达到各专业科室,要求专业科室将同业对标的指标标准值、先进企业的指标实绩与我局实绩比较,对比较后存在的差距进行问题点、问题原因分析,对分析不到位的问题点要求相关科室加大基层调查研究的力度,真正找到问题症结所在。 相似文献
17.
植物源农药因其低残留、无污染、易分解等优点,越来越受到广大科技工作者的青睐。本文主要对植物源农药的研究现状、存在问题及前景展望等作了阐述,并对将来的发展提出了几点建议。 相似文献
18.
19.
20.