共查询到17条相似文献,搜索用时 625 毫秒
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刚毛藻对Cu、Fe、Zn的耐受与污染控制研究 总被引:1,自引:0,他引:1
研究刚毛藻对Cu、Fe、Zn的耐受情况。实验设计了3种重金属的浓度,分别为00、.5 mg/L1、.0 mg/L、2.5 mg/L、5.0 mg/L、7.5mg/L1、0 mg/L的培养液,培养期间观察记录刚毛藻的长势,测定藻类生物量及叶绿素a的含量变化,研究藻体对模拟水中3种重金属的去除动态及实际去除效果。结果表明,3种重金属在低浓度(0.5—2.5 mg/L)时藻体长势较好;浓度达到5mg/L时开始出现毒害现象,表现为叶绿素a含量下降趋势;浓度达到7.5mg/L以上时藻体死亡。水体中有效Cu、Fe、Zn浓度较低时,藻体对3种重金属去除效果较好,较高浓度时由于毒害作用使其对3种重金属的去除能力下降。 相似文献
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江西珍稀濒危植物资源与保护 总被引:5,自引:0,他引:5
经调查统计,江西分布有国家第一批珍稀濒危保护植物74种,比《中国珍稀濒危植物》记载本省的种类(48种)增加了26种。本文论述了本省珍稀植物濒危的原因和我省自然保护的实际情况,提出了保护、发展和合理利用珍稀濒危植物资源的意见。 相似文献
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九峰山地区天然植被保存完整,动植物资源颇为丰富。该区有维管束植物82科302属596种;陆栖脊椎动物134种,其中兽类25种、鸟类100种(另有2亚种)、两栖和爬行类7种、鱼类2种。蒙古扁桃和黄芪为国家三类保护植物,青羊和雪豹为国家二类保护兽类,金雕等13种鸟为国家二类保护鸟类;另外还有其它用途的经济动、植物。 相似文献
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九峰山地区的生物资源及其保护 总被引:1,自引:0,他引:1
九峰山地区天然植被保存完整,支票物资源颇为丰富。该区有维管束植物82科302属596种,陆栖脊椎动物134种,其中兽类25种,鸟类100种(另有2亚种)、两栖和爬行类7种、鱼类2种。蒙古扁桃和黄芪为国家三类保护植物,青羊和雪豹为国家二类保护兽类,金雕等13处鸟为国家二类保护鸟类,另处还有其它用途的经济动、植物。 相似文献
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黄山市分布有49种国家级保护植物。依据药用、食用、材用、绿化观赏、芳香、栲胶等利用价值和科学研究价值将它们分为7类,阐述了各类代表植物的利用价值,对黄山市国家级保护植物的保护措施和开发利用提出建议。 相似文献
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川南地处四川盆地南部,长江上游,属大娄山北翼,西南以金沙江为界,与云南相邻,雷波和马边紧靠小凉山,海拔最高为4000m。该区属中亚热带气候,地貌、土壤、水文等自然条件复杂。由于自然条件优越,所以植物种类丰富,植物资源在全川占有一定的地位。一、野生资源植物现状 1.珍稀植物据“国家保护植物名录”确定,在我国第一批354种重点保护植物中,川南地区共有44种,占全国保护植物的12.7%,占四川省保护植物的1/2以上。 相似文献
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本文根据我国珍稀濒危植物的保护现状和管理工作中存在的问题,系统地探讨了加强我国珍稀濒危植物和野生植物资源保护的政策措施。文中提出一系列具体、有效的政策构思,以及建立政府有关主管部门对珍稀濒危植物协调管理的体制等。 相似文献
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The Indian desert, the Thar Desert, has its own importance and specific characteristics with respect to endemic and medicinal plants. Forty-five plant species are considered to be rare and/or endangered. The desert has a large number of plants of economic importance and medicinal use. The Thar Desert is thickly populated in comparison to other hot deserts of the world. 17.44 million people and 23.33 million livestock are recorded from the region. These populations exert pressure on the biological resources of the Thar Desert causing a lack of sustainability and necessitate conservation of biodiversity actions. 相似文献
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川西北地区位于青藏高原东南部,现有两栖爬行动物67种(亚种),其中两栖类28种,爬行类39种;珍稀、濒危种约占22.4%,经济意义大、有利用价值的种占29.8%,经济意义一般的种占47.8%。这些动物在科研、工艺、药用、维护生态平衡等方面均有一定意义。本文对这些动物的利用现状作了评价,并对资源保护提出5点建议。 相似文献
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Population viability analysis as a tool in wildlife conservation policy: With reference to Australia
David B. Lindenmayer Tim W. Clark Robert C. Lacy Virginia C. Thomas 《Environmental management》1993,17(6):745-758
Wildlife conservation policy for endangered species restoration follows a six-phase process. Population viability analysis
(PVA) can play a major contributing role in four of these. PVA, as discussed here, is a technique where extinction vulnerabilities
of small populations are estimated using computer simulation modeling. The benefits and limitations of using PVA in wildlife
decision and policy processes are reviewed based on our direct experience. PVA permits decision makers to set time frames
for management, estimate the required magnitude of restoration efforts, identify quantitative targets for species recovery,
and select, implement, monitor, and evaluate management strategies. PVA is of greatest value for rare species policy and management.
However, a limitation of PVA simulation models is that they are constrained by the amount of biological data available, and
such data are difficult to obtain from small populations that are at immediate risk of extinction. These problems may be overcome
with improved models and more data. Our experience shows benefits of PVA far outweigh its limitations, and applications of
the approach are most useful when integrated with decision analysis and completed within an adaptive management philosophy.
PVAs have been carried out for 14 Victorian species and less used elsewhere in Australia. Management and recovery plans are
developed from these PVAs. We recommend that PVA be used to guide research programs, develop conservation strategies, and
inform decision and policy making for both endangered and nonendangered species because it can significantly improve many
aspects of natural resource policy and management. 相似文献