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淤泥土中抗拔桩在濒海地区的应用研究
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作者 赵小燕 韩雪 曹利岗 《河南建材》 2011年第5期48-49,共2页
工程桩基础的设计主要考虑竖向承载力或基础沉降等问题,但在靠近海边特殊的场地,地质条件比较差并且受海风影响,需要设计抗拔桩。本文通过工程实践将桩基础的应用范围做了进一步的扩展,使其作为抗拔桩应用于特种结构。
关键词 淤泥土 抗拔桩 特种结构 濒海区
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基于物候参数和面向对象法的濒海生态脆弱区植被遥感提取 被引量:10
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作者 张贵花 王瑞燕 +3 位作者 赵庚星 袁秀杰 彭杨 王向峰 《农业工程学报》 EI CAS CSCD 北大核心 2018年第4期209-216,共8页
用遥感数据快速准确地提取植被信息对生态环境监测和发展气候模型具有基础性和关键性的意义。由于中国黄河三角洲地区植被类型插花分布,传统遥感提取方法精度较低。该文选取近代黄河三角洲典型生态脆弱区为研究区,基于MODIS和LANDSAT8数... 用遥感数据快速准确地提取植被信息对生态环境监测和发展气候模型具有基础性和关键性的意义。由于中国黄河三角洲地区植被类型插花分布,传统遥感提取方法精度较低。该文选取近代黄河三角洲典型生态脆弱区为研究区,基于MODIS和LANDSAT8数据,通过提取研究区的物候参数和不同分辨率遥感影像的融合处理,根据植被类型斑块大小确定分割尺度,根据典型植被类型的物候特征、光谱和空间等特征值构建分类规则,利用分区策略自上而下进行面向对象分类。结果表明,该方法总体精度为80.75%,Kappa系数0.79,高于传统物候和面向对象分类方法。广生态幅的棉田与其他植被的光谱混淆是传统面向对象分类方法植被分类精度低的主要原因,利用物候参数进行植被分区能规避棉田和自然植被的光谱混淆,有利于对植被类型的区分。分类结果与当地植被分布情况相符,可以用于研究区植被类型的精细提取。 展开更多
关键词 遥感 植被 提取 濒海生态脆弱 物候参数 面向对象方法
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Ethnobotanical Study of Some Useful Plants Used as Folk Remedies in Anatolia (Turkey)
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作者 A. Duzenli D. Karaomerlioglu 《Journal of Agricultural Science and Technology(B)》 2011年第5期692-697,共6页
Turkey contains about 11,000 plant taxa. The study area covers East Mediterranean Region of South Anatolia. It is detected that plant diversity in this area corresponds to 51% of Turkey's native flora. In this study,... Turkey contains about 11,000 plant taxa. The study area covers East Mediterranean Region of South Anatolia. It is detected that plant diversity in this area corresponds to 51% of Turkey's native flora. In this study, we investigated native plants in point of ethnobotanic usage of some endemic and endangered plants used as folk remedies in Anatolia. Especially collected causes of these plants are executed. A questionnaire form is designed as a tool for gathering information from many villages of different districts within the area. Endemic taxon rate in the study area is 25% and non-endemic taxon rate is 5%. 45% of the plants in the area have ethnobotanical importance. 21% of them are utilized as medicinal, 14% as foods, 10% as agricultural products, 6% as industrial inputs and 3% as ornamental plants. 6% of the endangered plants with ethnobotanical importance are endemic and 2% of them are non-endemic. Due to ethnobotanical usage, endemic plants are endangered. 12 of 13 critically endangered taxa are utilised as medicinal, 5 as foods, 1 as agricultural and industrial input. In research area, some other taxa are also mistakenly collected because of morphological, physiological or aromatical resemblance to those collected plants. This fact creates even more negative impact especially on endemic and endangered taxa population. 展开更多
关键词 Ethnobotanic folk remedies useful plant ANATOLIA ENDEMIC
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