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对墨脱县优选耕地区进行土壤养分地球化学特征分析,查明墨脱县调查区土地质量状况,为调查区所在地方政府履行土地资源管理、农业结构调整、土壤环境保护、脱贫攻坚等管理职能提供科学依据。通过对185件样品进行有机质、N、P、K、B、Mn、Zn、Cu、Se、Mo、碱解N、速效P、速效K、pH、As、Cd、Cr、Hg、Pb、Ni、Co、V、F、I、Ge等25项元素指标的分析测试发现,墨脱县调查区的土壤以酸性土壤为主,而调查区表层土壤有机质含量以较丰富、丰富为主,两者合计面积达到22.02 km2,占调查区总面积的86.71%。调查区土壤全氮、碱解N、全磷、有机质含量相当丰富,全钾、速效P含量以中等为主,速效K以较缺乏为主。根据土壤养分综合等级划分,调查区土壤养分综合评价等级丰富的地块面积占4.90%,较丰富的地块面积占78.83%,中等的地块面积占15.41%,较缺乏地块面积占0.86%,无缺乏地块。 相似文献
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埃及是具有悠久历史和文化的古国,国土面积100.2万km2,沙漠面积达90%以上.全国分5个区,即西部利比亚沙漠区、东部沙漠区、尼罗河谷地和尼罗河三角洲区、苏伊土地峡区、西奈半岛区.现已利用土地52.5万hm2,其中农田面积为32.8万hm2,人均占有农田面积0.05hm2.总人口6300多万,农业人口占56%,全国95%的人口都集中在占国土面积5%的尼罗河两岸、苏伊士地峡区和沙漠中的少数绿洲上.埃及全境干燥少雨,大部分地区属热带沙漠气候.北部地中海沿岸地区雨水稍多,多集中在冬季,由北往南降雨量急剧减少. 相似文献
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在扼要介绍平远县坪山岗石灰石矿基本概况与地质条件的基础上,着重分析了该矿山存在的主要地质环境问题与成因。综合考虑其危害程度,依照"预防为主、防治结合"的基本原则,分别从保护性措施、工程治理措施以及监测措施四个方面提出了该矿山地质环境综合防治对策。通过预防与治理相结合,可使日益加剧的矿山地质环境问题得到有效遏制,消除或减弱矿山地质灾害安全隐患,并全面恢复矿山地质环境。 相似文献
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本次调查研究通过野外地震地质观察并结合热释光和释光测年手段,对研究区的5条主要断层活动性进行了研究。综合分析研究区的地震综合环境后认为研究区断层在中更新世有过明显活动且在断层交汇处由于应力集中作用具备发生5.5级地震的构造条件。 相似文献
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陈浩 《皮革制作与环保科技》2022,3(1):57-59,62
为了提高水环境保护区景观生态的可持续建设与发展能力,以某水环境保护区为例,对该地区的景观生态脆弱性时空特征展开分析.选择水环境保护区外围缓冲10.0 km的覆盖范围作为此次研究的主要区域,绘制研究区范围与地理位置概况图.采用图像增强、配准、调整等方式,对获取的信息进行预处理,以此完成水环境保护区概况与来源数据的处理,基于景观生态格局,构建一个水环境保护区脆弱性模型.使用ArcGIS10.2处理软件,对获取的遥感数据进行解析,将获取的数据与上述计算公式进行匹配,得到景观生态类型在三期内的占地面积,发现研究地区"城进湖退"问题较为严重.辅助使用景观时空特性分析软件Fragstats4.2,对研究区的景观数据进行分析,得到景观生态类型在三期内的脆弱度指数,并通过水环境保护区景观生态脆弱性驱动机制分析,得到水环境保护区生态系统的持续化建设仍有待加强的结论. 相似文献
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我国矿山种类丰富,在矿山开采领域具有较先进的水平,但在矿区的生态环境保护方面存在着一些问题。本文首先分析了矿区开发对周围环境造成的影响,然后分析了如何进行矿区的生态环境评价,最后研究了矿区的生态治理方法。希望通过本研究有效改善矿区的生态治理水平,确保矿区生态协调发展。 相似文献
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武夷岩茶不同岩区品质形成研究进展 总被引:1,自引:0,他引:1
武夷岩茶是四大乌龙茶中闽北乌龙的典型代表。由于地理环境的不同,武夷岩茶有正岩、半岩、洲茶之分。其中正岩茶香高味浓、醇而不涩,其品质优于半岩茶和洲茶。而洲茶的品质较次于半岩茶,这和其生长的环境、土壤因素有着重要关系。本文综述了武夷岩茶不同岩区风味品质差异的历史形成以及现代分析技术依据,并从气候条件和土壤条件两方面分析形成不同岩区岩茶品质差异的成因,得出武夷岩茶不同岩区风味品质差异主要是由于名岩产区独特的地质条件和优异的生态环境所生产出的茶鲜叶品质优良。并指出构建武夷山正岩茶产区自然生态模型将有助于自然生态已遭破坏的茶产区恢复生态环境,提高茶叶品质,同时也可作为茶叶设施农艺的理论依据;另一方面对于不同岩区武夷岩茶感官品质的剖面分析可能是进一步研究形成正岩茶优异品质的方向,或许能够为提高其他产区岩茶品质指明道路。 相似文献
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在我国生态环保事业不断发展的时代背景下,作为生态环保事业工作者,必须对生态环境保护的工作模式进行创新和改进,而生态环境监测工作是生态环境保护事业中的关键环节,精准的生态环境监测可以发挥极大的效果,为生态环境保护工作的开展提供数据支撑,有利于生态环保事业的长久发展,也能使生态环保工作更加符合社会发展的需求,使其与现阶段的经济形势相符,从而进一步提高生态环保工作效果。正因如此,本文简述了生态环境监测的特点并分析了其在生态环境保护中的作用和意义。 相似文献
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To evaluate the scale-dependent spatial variability of water chemistry within two Swedish boreal catchments (subcatchment areas 0.01-78 km2), samples were taken at every junction in the stream network during June 2000 and August 2002. The values of most chemical constituents spanned more than an order of magnitude, and the range was similar to that found in all of Northern Sweden by the national stream survey in 2000. According to the official assessment tools used in Sweden, the entire range of environmental status (for pH, absorbance, alkalinity, dissolved organic carbon (DOC)) and human acidification influence existed within these two study catchments. The water chemistry parameters were relatively stable at catchment areas greater than 15 km2. Sampling at that scale may be adequate if generalized values for the landscape are desired. However the chemistry of headwaters, where much of the stream length and aquatic ecosystem is found would not be characterized. Map parameters correlated to the variability in a key chemical parameter, DOC, but the best predictive map parameters differed markedly between catchments. This study highlights the importance of accounting for headwater spatial variability in environmental assessments of running waters, even in relatively pristine areas. The nature of drainage networks with many headwaters and progressively fewer downstream watercourses makes this a considerable challenge. 相似文献
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Ahn JH Grant SB Surbeck CQ DiGiacomo PM Nezlin NP Jiang S 《Environmental science & technology》2005,39(16):5940-5953
Field studies were conducted to assess the coastal water quality impact of stormwater runoff from the Santa Ana River, which drains a large urban watershed located in southern California. Stormwater runoff from the river leads to very poor surf zone water quality, with fecal indicator bacteria concentrations exceeding California ocean bathing water standards by up to 500%. However, cross-shore currents (e.g., rip cells) dilute contaminated surf zone water with cleaner water from offshore, such that surf zone contamination is generally confined to < 5 km around the river outlet. Offshore of the surf zone, stormwater runoff ejected from the mouth of the river spreads out over a very large area, in some cases exceeding 100 km2 on the basis of satellite observations. Fecal indicator bacteria concentrations in these large stormwater plumes generally do not exceed California ocean bathing water standards, even in cases where offshore samples test positive for human pathogenic viruses (human adenoviruses and enteroviruses) and fecal indicator viruses (F+ coliphage). Multiple lines of evidence indicate that bacteria and viruses in the offshore stormwater plumes are either associated with relatively small particles (< 53 microm) or not particle-associated. Collectively, these results demonstrate that stormwater runoff from the Santa Ana River negatively impacts coastal water quality, both in the surf zone and offshore. However, the extent of this impact, and its human health significance, is influenced by numerous factors, including prevailing ocean currents, within-plume processing of particles and pathogens, and the timing, magnitude, and nature of runoff discharged from river outlets over the course of a storm. 相似文献