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鄱阳湖湿地虉草种群自然分布及影响因子研究 被引量:1
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作者 曹昀 王佳艺 +2 位作者 国志昌 吴海英 罗姗姗 《人民长江》 北大核心 2019年第5期59-64,共6页
虉草是鄱阳湖洲滩湿地典型优势植物,对维护湿地生态及环境有重要意义。以鄱阳湖湿地优势植物种群虉草为研究对象,采用野外调查和统计分析相结合的方法,研究了虉草种群自然分布特征和影响因子(土壤水分状况、高程)的关系。结果表明:①根... 虉草是鄱阳湖洲滩湿地典型优势植物,对维护湿地生态及环境有重要意义。以鄱阳湖湿地优势植物种群虉草为研究对象,采用野外调查和统计分析相结合的方法,研究了虉草种群自然分布特征和影响因子(土壤水分状况、高程)的关系。结果表明:①根据高斯回归方程,虉草分布的高程范围为9.85~18.11 m,分布的最适高程在12.13~15.84 m;②虉草作为优势种在12~15 m高程范围出现的频次较多,在14~18 m平均盖度和平均高度较大;③虉草作为伴生种在13~15 m高程范围出现的频次较多,在15~16 m及18 m处平均盖度较大,在14~15 m及17m处平均高度较大;④土壤水分状况明显影响虉草种群自然分布,虉草种群出现的频次随土壤湿度的增加呈下降趋势,在湿环境下生长状况最好,各土壤湿度下虉草作为优势种出现的频次由大到小为干、稍润、润、湿、潮,作为伴生种出现的频次由大到小为干、稍润、润、潮、湿。 展开更多
关键词 虉草 种群自然分布 湿地 环境影响因子 鄱阳湖
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Relationship between ethnic landscape and environment in the Nujiang River basin of Yunnan Province, China
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作者 Jing Ying Huang Chengmin Su Caixiu 《Ecological Economy》 2007年第3期303-311,共9页
Each nationality has formed unique ethnic culture in the long history. Ethnic culture is spatially reflected byethnic distribution. The distribution of nationalities is influenced by ethnic history, culture, society a... Each nationality has formed unique ethnic culture in the long history. Ethnic culture is spatially reflected byethnic distribution. The distribution of nationalities is influenced by ethnic history, culture, society and religion, alsoaffected by regional physical setting. This paper analyzes the relationship between ethnic distribution pattern and naturalsetting with contrast analytical method. The digital elevation model (DEM) is established on basis of contour map on ascale of 1:250,000 in the Nujiang River basin, Yunnan Province by ArcGIS, a Geographic Information System (GIS)software. Based on DEM, the spatial analysis and statistical function of GIS, the landscape patterns of populationdistribution of the selected minorities is described, and 4 sub-regions are divided in the Nujiang River basin of YunnanProvince while the features and disparity of landscape pattern and its forming mechanism are discussed, along withhistorical and archaeological data. The conclusions are as follow: (1) The ethnic distribution is mosaic in the matrix ofother racial distribution, and have a distinct spatial correlation. (2) For the difference in cultivation between differentnationalities, certain nationality lived in the area suitable for production mode of its own and coincident with appropriategeographical setting. (3) The spatial distribution of settlement spots of the minorities is controlled by the convenience ofwater supply. The landscape pattern of ethnic distribution is closely relative to natural environment. 展开更多
关键词 Ethnic group distribution Landscape pattern Nujiang River Basin GIS Natural environmentl
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