中文题名: | 鄱阳湖湿地NDVI演变与候鸟时空分布关系研究(博士后研究工作报告) |
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学科代码: | 083001 |
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学生类型: | 博士后 |
学位: | 理学博士 |
学位年度: | 2012 |
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研究方向: | 环境与健康 |
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提交日期: | 2012-09-10 |
答辩日期: | 2012-09-09 |
外文题名: | NDVI Variation and Spatial Temporal Distribution of Migratory Birds in the Poyang Lake Wetland |
中文摘要: |
本文基于1999-2009年间的SPOT-VGT NDVI 影像数据,利用遥感和地理信息系统方法分析鄱阳湖湿地NDVI的时空变化趋势;并利用1999-2009年间鄱阳湖湿地越冬候鸟环湖调查数据,分析候鸟的时空分布特征,对候鸟按照食性进行分类,分析各食性候鸟时空分布特点。最后,基于相关统计分析鄱阳湖湿地NDVI变化与各食性候鸟时空分布的相互关系,并建立不同NDVI区间与土地利用分类的关系,得出NDVI与不同食性候鸟的相关性和相关系数。研究结果表明:(1)鄱阳湖地区NDVI的时序变化明显,并随时间呈整体上升趋势。由于鄱阳湖独特的水文特性,其沿湖各保护区NDVI值受季节和水文动态的双重影响。鄱阳湖国家自然保护区、南矶山自然保护区、康山自然保护区以及鄱阳湖北部地区植被覆盖保护较好,NDVI值处于较高水平。鄱阳湖周边绝大部分地区植被覆盖基本不变和略微上升,表明植被的覆盖程度有逐步增加的趋势。(2)整个鄱阳湖地区越冬候鸟的种类及数量随时间呈整体上升趋势,在空间分布上遍布鄱阳湖湿地各保护区,其数量主要分布在鄱阳湖国家自然保护区、康山自然保护区以及都昌候鸟保护区,且近年来有向鄱阳湖国家自然保护区集中的趋势。(3)鄱阳湖NDVI与候鸟时空分布的相关研究中,其与各保护区候鸟数量分布变化呈现显著相关性,相关系数多在0.6以上。在与各食性候鸟的相关分析中,食草类候鸟与都昌候鸟保护区、康山自然保护区和白沙洲自然保护区3个地区的NDVI值呈现显著相关性;食块茎类以及食昆虫软体类不呈现很强的相关性,相关系数无统计学意义,但是仍能看出一定的正相关趋势;食鱼虾类候鸟与杂食类的候鸟与NDVI则不呈现任何相关性。该研究明确了鄱阳湖湿地候鸟的时空分布,为整个鄱阳湖地区候鸟的生态保护及鄱阳湖湿地自然保护区的建设与管理提供了理论依据,同时,作为评价候鸟的非连续传播方式在禽流感传播中地位与作用的前期研究,为有效防控禽流感传播提供了一定的科学借鉴意义。
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外文摘要: |
In this study, SPOT-VGT imagery was used to monitor vegetation coverage of the Poyang Lake wetland. NDVI serves as an indicator revealing vegetation change of the wetland. Spatial temporal trend of NDVI in the Poyang Lake wetland was analyzed. The spatial temporal distribution of migratory birds in the Poyang Lake from 1999 to 2006 was also investigated. Migratory birds were classified based on their feeding habits. We then analyzed the relationship between the NDVI change and the spatial distribution of migratory birds. The correlation coefficient between a time series of NDVI and different types of migratory birds were obtained.Our results showed that: (1) temporal change of NDVI in the Poyang Lake area showed an overall upward trend. All Natural Reserves in Poyang Lake area were impacted by both phonological and water level changes. The vegetation coverage of the national nature reserves including Nanjishan Nature Reserve, Kangshan Nature Reserve, and the northern Poyang Lake was higher than elsewhere in the region, indicated by higher NDVI. The vegetation coverage of most areas around the Poyang Lake has a positive slight increasing trend, but not statistically significant. (2) The total number of migratory birds and the number of bird species in the Poyang Lake area showed an overall increase over time. Poyang Lake region is a harbor of migratory birds with main habitats distributed in the National Nature Reserve, Kangshan Nature Reserve, and Duchang Reserve. (3) The NDVI value was correlated with the quantity of migratory birds with a correlation coefficient (an R squared value?) above 0.8. For herbivorous birds, NDVI of the three areas, Duchang, Kangshan, and Baishazhou Reserve, was significantly correlated with the quantity of migratory birds respectively.This association study between the NDVI and the spatial temporal distribution of migratory birds in the Poyang Lake wetland provide us a theoretical basis for the protection of migratory birds in the Poyang Lake area, and the management of the Poyang Lake Nature Reserve. As a preliminary study on the role that migratory birds play in the circulation of the avian influenza virus, this will also provide policy recommendations to make effective prevention and control strategies.
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参考文献总数: | 56 |
作者简介: | 吴晓旭,女,1984年生,博士,2010年进入环境学院博士后流动站,研究方向为环境与健康。在站工作期间,发表学术论文4篇(均为第一作者),包括SCI论文1篇;在站期间主持国家自然科学基金(青年基金)项目“高立式机械沙障流场的数值模拟研究”以及博士后面上基金“中国H5N1高致病性禽流感时空分布的自然地理传播因素研究”。 |
馆藏地: | 图书馆学位论文阅览区(主馆南区三层BC区) |
馆藏号: | 博083001/1217 |
开放日期: | 2012-09-10 |