| 引用本文: | 叶春,赵晓松,吴桂平,王晓龙,刘元波.鄱阳湖自然保护区植被生物量时空变化及水位影响.湖泊科学,2013,25(5):707-714. DOI:10.18307/2013.0512 |
| YE Chun,ZHAO Xiaosong,WU Guiping,WANG Xiaolong,LIU Yuanbo.Vegetation biomass spatial-temporal variations and the influence of the water level in Poyang Lake National Nature Reserve. J. Lake Sci.2013,25(5):707-714. DOI:10.18307/2013.0512 |
|
| 摘要: |
| 基于时间序列Moderate Resolution Imaging Spectroradiometer(MODIS)植被指数,结合野外实测生物量及水文气象等数据,分析了2001 2010年退水期鄱阳湖国家自然保护区湿地植被生物量的空间格局及其时间变化规律,并在此基础上探讨了水位变化的影响.研究结果表明:(1)湿地植被生物量密度多年均值处于0~1402 g/m2之间,除蚌湖四周生物量沿湖心向四周逐渐升高外,其他区域呈现南高北低的分布格局,且其分布与研究区高程密切相关;(2)湿地植被生物量密度多年均值在退水初期为901 g/m2,随时间变化先上升后降低;植被分布面积则随着滩地出露而逐渐增大,随后基本稳定;总生物量呈现单峰变化,在11月初达到最高值.2001 2010年研究区年均生物量变化呈现波动状态,多年均值为18.3×107kg;最高出现在2006年,达到28.2×107kg,2010年最低,仅有8.37×107kg;(3)年均生物量与洲滩出露天数以及植被分布面积呈显著正相关,相关系数分别为0.719和0.865.水位变化为湿地生物量变化的重要影响因素. |
| 关键词: 鄱阳湖 湿地植被 生物量 遥感 MODIS |
| DOI：10.18307/2013.0512 |
| 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"重点项目(NIGLAS2012135001)联合资助 |
|
| Vegetation biomass spatial-temporal variations and the influence of the water level in Poyang Lake National Nature Reserve |
|
YE Chun1,2, ZHAO Xiaosong1, WU Guiping1, 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: |
| Vegetation is an important part of wetland ecosystem in Poyang Lake National Nature Reserve and the analysis of its spatial-temporal variations and the influences of water level changes offer a better understanding of biotic community and habitats of immigrating birds.Hence,the primary concern of this paper is the effects of varying water levels on spatial-temporal variations of biomass in Poyang Lake National Nature Reserve based on MODIS EVI time series data.We also made use of biomass measurements obtained from a field campaign and hydro-meteorological data to assist our study.The main results are as follows: (1) Multi-year annual mean biomass density is between 0 and 1402 g/m2.Except Lake Banghu which shows a radial distribution with lower biomass in the center and higher biomass outside,biomass distribution for the rest of the area generally decreases from north to south and is closely related with elevation.(2) Biomass density for flood recession period is about 901 g/m2 and firstly increases and then decreases with time.The size of the area of vegetation community increases with the exposure of lake bottom and thereafter remains unchanged.The total biomass exhibits a unimodal distribution with a maximum in November.The annual mean values of biomass from 2001 to 2010 bear comparative fluctuations with the ten-year mean value of 18.3×107 kg,and maximum of 28.2×107 kg in 2006,and minimum of 8.37×107 kg in 2010.(3) Annual mean biomass is significantly related with the exposure days of lake bottom and with the size of the area of vegetation community,with a correlation coefficient of 0.719 and 0.865,respectively.To sum up,the water level is a key factor of biomass variations. |
| Key words: Lake Poyang wetland vegetation biomass remote sensing MODIS |
