Results 21 to 30 of about 241 (96)
Spatial and Temporal Changes and Driving Factors of Soil Erosion in North Piedmont of Yinshan Mountain [PDF]
, 2023 [Objective] The spatial and temporal changes of soil erosion and its influencing factors in the north piedmont of Yinshan Mountain from 2000 to 2020 were analyzed in order to provide scientific guidance for soil erosion control and land space planning in
Aruhan, Pan Haiwei, Wu Shuai
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A dataset of land cover classification in 25 port cities and their surrounding areas along“One Belt and One Road” (2015) [PDF]
, 2017 利用2015年成像的Landsat 8 OLI多光谱影像，参考全球30 m土地覆盖数据（GlobeLand30）的分类标准、制图规范，建立“一带一路”港口城市土地覆盖分类系统，运用ENVI 5.2软件，基于支持向量机的监督分类方法，对“一带一路”海上丝绸之路沿线的25个重要港口城市及其周边区域的土地覆盖进行遥感分类，经过严格的修改与精度验证工作，得到土地覆盖分类数据。本数据集可用于土地利用变化、生态环境变化研究 ...
侯西勇, 宋洋
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GIS-based Study of Ecological Water Requirement of Vegetation in Inner Mongolia Autonomous Region [PDF]
, 2023 [Objective] The ecological water requirement (EWR) of vegetation in different typical zones for the rational allocation of water resources in the Inner Mongolia Autonomous Region was analyzed and calculated to provide scientific suggestions for water ...
Ge Zheng +5 more
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, 2007 郝景盛在西北考查团中的植物考察和采集,是中国学者在新中国成立之前在青海地区有限的几次之一.当时西方人在青藏高原的考察已经很多.郝景盛后来在德国完成的博士论文《青海植物地理》,以他自己的这次考察为基础,充分利用了西方已有的研究成果,对青海东北部作了植物地理学研究 ...
徐凤先
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, 1998 通过对短花针茅荒漠草原几种牧草不同刈割高度下再生特性的研究，结果表明，刈割时留茬高度不同，牧草的再生能力显著不同，0CM留茬，牧草的再生次数、再生速度及再生草产量均小于2CM~3CM留茬，而2CM~3CM留茬再生次数、再生速度差别不大（P＞0.05 ...
许志信, 赵萌莉
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, 1981 寄生在牛羊肝脏的双腔吸虫在国内各农牧区中形成流行区的有中华双腔吸虫(Dicr-ocoelium chinemis Tang et Tang,1978)、矛形双腔吸虫(D. lanceatum Stiles et Hassall,1896)及扁体矛形双腔吸虫亚种(D. lanceatum platynosomum Tang et al., 1980)它们在国内分布及危害情况曾有介绍(唐崇惕等,1980)。矛形双腔吸虫在国内有很大的分布区,也曾有人体病例报道。本吸虫的生活史虽已经阐明(Noller ...
唐仲璋 +6 more
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Research on the potential and strategy for coal resources exploitation in Xinjiang [PDF]
In view of the uniqueness of the occurrence conditions of coal resources in Xinjiang and the fragility of the ecological environment in the coal occurrence area, it is urgent to develop coal resources in Xinjiang scientifically. Therefore, in this paper,
Changshen WANG +7 more
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Advances in the Study of Arbuscular Mycorrhizal Fungi in High Altitude and Cold Habitats on Tibetan Plateau [PDF]
, 2017 极端生境往往蕴藏着具有特殊生理生态功能的生物类群.海拔高、温度低、生长季节短的青藏高原高寒草原生态系统是典型的极端生境之一,目前有关该生境中分布的丛枝菌根真菌（Arbuscular mycorrhizal fungi,AMF）研究已引起广泛关注.本文从青藏高原高寒生境中AM真菌的研究概况入手,论述青藏高原高寒生境中AM真菌的群落组成、物种多样性与分布特征、菌根侵染发育状况及高寒生境对AM真菌的影响.指出高寒生境中AM真菌群落结构研究方面存在的问题,探讨解决这些问题的可能途径及其研究发展前景 ...
张亮, 王强, 王晓娟, 金樑
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野生动物学报, 2004 藏羚羊是青藏高原的特有物种,栖息于海拔4000-5500米间的高寒草甸、高寒荒漠草原及高寒荒漠等环境中。藏羚羊的绒毛轻柔无比,用藏羚羊绒制成的披肩叫做“沙图什”（Shahtoosh ...
孙忻, 王丽
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, 1980 寄生在牛羊及人体肝脏胆管的双腔吸虫广泛地分布于南北美洲、欧洲、非洲及亚洲。在我国主要分布在温带草原、温带荒漠草原中的森林草原、青藏高原、暖温带的黄土高原及亚热带云贵高原等地区(见图1)。各地牛羊受感染严重,感染率常在70％以上,百分之百受感染的牛羊群亦不罕见。每只患畜感染强度可达千余条虫至万余条甚至拾几万条。各流行区每年牲畜因此吸虫病死亡可达5—10％,对畜牧业生产危害很大 ...
吕洪昌 +7 more
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