摘要
以星子水文站逐日平均水位数据为基础,以自然年内多个特定水位维持时长为主要指标来表征水位波动规律,研究1987~2015水文情势变化。按湖底高程差异,将鄱阳湖分成10个高程区间,基于1988~2015年间18景Landsat遥感影像,通过提取NDVI指数,研究18a丰水期植被面积的变化。使用冗余分析RDA分析上一年和当年水位变化因子与1988~2015年鄱阳湖各高程区间丰水期植被覆盖面积间的关系。结果表明:(1)1988~2015年,鄱阳湖水位呈下降趋势,枯水期长度增加,丰水期长度减小;(2)1988~2015年,鄱阳湖丰水期植被面积随着年份呈增加的趋势,其中湖底高程(黄海高程)为10.5~11.5、11.5~12.5、12.5~13.5m区间的增加趋势比其他高程显著;(3)鄱阳湖湖底高程较高的地段,丰水期植被面积年际差异较小;(4)丰水期植被面积与上一年度丰水时长显著负相关。
Based on the data of daily average water level of Xingzi hydrological station and by using the number of specific water level duration as the main index to characterize the fluctuation of water level,this paper investigated the change of hydrological regime from 1987 to 2015.According to different elevations of lake,the Poyang Lake is divided into 10 elevation intervals.Based on the Landsat remote sensing images from 1988 to 2015,the NDVI index was used to study the changes of the vegetation area in the 18 aperiod.The relationship between the water level change factors of the previous year and the current year,and the vegetation coverage area in the high rainfall interval of Poyang Lake from 1988 to 2015 was analyzed by using the RDA.The results showed that：（1）From 1988 to 2015,the water level of Poyang Lake decreased,the length of dry season increased and the length of water period decreased.（2）In 1988-2015,the vegetation area of Poyang Lake increased with the year（3）Poyang Lake bottom of the higher elevation of the lot,the wet season of vegetation area（Poyang Lake）,the height of the lake are higher than those of the other（4）The vegetation area in the wet season was negatively correlated with the duration of the previous year.
出处
《南昌大学学报（理科版）》
CAS
北大核心
2017年第4期341-348,共8页
Journal of Nanchang University(Natural Science)
基金
江西省水利厅重大科技项目(KT201505)
关键词
鄱阳湖
丰水期长度
湿地植被
水文情势
Poyang Lake
the length of water period
wetland vegetation
hydrological regime
