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引用本文:叶春,吴桂平,赵晓松,王晓龙,刘元波.鄱阳湖国家级自然保护区湿地植被的干旱响应及影响因素.湖泊科学,2014,26(2):253-259. DOI:10.18307/2014.0212
YE Chun,WU Guiping,ZHAO Xiaosong,WANG Xiaolong,LIU Yuanbo.Responses of wetland vegetation to droughts and its impact factors in Poyang Lake National Nature Reserve. J. Lake Sci.2014,26(2):253-259. DOI:10.18307/2014.0212
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鄱阳湖国家级自然保护区湿地植被的干旱响应及影响因素
叶春1,2, 吴桂平1, 赵晓松1, 王晓龙1, 刘元波1
1.中国科学院南京地理与湖泊研究所, 南京 210008;2.中国科学院大学, 北京 100049
摘要:
近年来鄱阳湖干旱事件频发,干旱导致的气象水文要素变化直接影响植被生长状况,尤其是对于地上植被生物量的影响极为显著.研究鄱阳湖干旱事件对于湿地植被的影响,对于保护鸟类栖息地,认识湿地生态功能和结构的变化具有重要的现实意义.利用长期卫星遥感数据,结合植被生物量野外调查,以2003和2006年极端干旱年份为出发点,从湿地植被面积、生物量密度和总生物量的角度分析了鄱阳湖湿地植被生物量对于极端干旱的响应.研究表明:湿地植被面积、生物量密度以及总生物量均呈现双峰分布特征,在4和11月分别达到上、下半年的峰值.2003年植被生物量与多年均值一致,2006年下半年植被面积、生物量密度以及总生物量均明显超出多年均值.影响湿地植被面积的主要因素为鄱阳湖水位变化;而影响植被生物量密度的主要因素为气温和水位,退水时间提前对于生物量密度影响最大;总生物量同时受到植被面积与植被生物量密度的综合影响,其中植被面积的影响更大,植被面积对于总生物量的影响在2006年表现得比2003年更加显著.总之,2006年湿地植被对水文干旱的响应要比气象干旱强烈得多.
关键词:  鄱阳湖  干旱  总生物量  植被面积  生物量密度  遥感
DOI:10.18307/2014.0212
分类号:
基金项目:国家重点基础研究发展计划"973"项目(2012CB417003);中国科学院南京地理与湖泊研究所"一三五"战略发展重点项目(NIGLAS2012135001)联合资助
Responses of wetland vegetation to droughts and its impact factors in Poyang Lake National Nature Reserve
YE Chun1,2, WU Guiping1, ZHAO Xiaosong1, WANG Xiaolong1, LIU Yuanbo1
1.Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, P. R. China;2.University of Chinese Academy of Sciences, Beijing 100049, P. R. China
Abstract:
Recent droughts have changed meteorological and hydrological conditions of Lake Poyang and caused great influences on vegetation growth, especially for the vegetation biomass on the ground. To investigate the influences of droughts on vegetation, it is vital to preserve habitats for migrating birds and to understand the ecological functionality of wetland. For this purpose, we used long-term satellite data to inspect the response of vegetation biomass associated with field measured vegetation biomass for the typical drought years 2003 and 2006 in terms of vegetation area, biomass density and total biomass. Vegetation area, biomass density and total biomass show general two peaks across 2003 and 2006, and the peaks occur in April and November, respectively. The biomass had little variation by comparison with multi-year mean biomass between 2001 and 2010, while biomass for the second half year of 2006 are much higher than multi-year averages for corresponding months. The dominating factor affecting vegetation area is the lake water level, while biomass density is affected by temperature. The time of water recession has the greatest influence on biomass density variations. The total biomass is affected by both vegetation area and biomass density, and the magnitude of effects of vegetation area is more than that of biomass density. This is more significant for 2006 than 2003. To conclude, response of vegetation to hydrological drought is much stronger than that to meteorological drought in 2006.
Key words:  Lake Poyang  drought  total biomass  vegetation area  biomass density  remote sensing
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