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鄱阳湖水体淹没频率变化及其湿地植被的响应
引用本文:谷娟,秦怡,王鑫,马静宇,郭仲皓,邹乐君,沈晓华.鄱阳湖水体淹没频率变化及其湿地植被的响应[J].生态学报,2018,38(21):7718-7726.
作者姓名:谷娟  秦怡  王鑫  马静宇  郭仲皓  邹乐君  沈晓华
作者单位:浙江大学地球科学学院;电力设备电气绝缘国家重点...;江苏省住建厅城建处;;浙江中控技术股份有限公司...;广州市环境保护工程设计院...;南京大学经济学院;;安徽江淮汽车集团股份有限...;中国科学院电子学研究所;...;民航内蒙古空管分局技术保...;湖南工业大学农牧业废弃物...;浙江大学地球科学学院;
基金项目:电力设备电气绝缘国家重点...;江苏省住建厅城建处;;浙江中控技术股份有限公司...;广州市环境保护工程设计院...;南京大学经济学院;;安徽江淮汽车集团股份有限...;中国科学院电子学研究所;...;民航内蒙古空管分局技术保...;湖南工业大学农牧业废弃物...;浙江大学地球科学学院;
摘    要:湖水淹没频率是影响湿地植被生态系统的最重要的水文因素。基于地物波谱特征的MODIS混合像元分解模型,分析了2000—2015年退水期鄱阳湖水体淹没频率的时间变化和空间规律,并在此基础上探讨了湿地植被的空间响应。研究结果表明:(1)鄱阳湖退水期水体的淹没频率总体呈"南低北高",同时具有大小不一的"斑块式"空间分布特征;(2) 15年内湖水的淹没频率经历了先急剧缩减然后恢复到相对稳定的状态,并且不同空间段的变化差异明显:北部河道的淹没频率先急剧降低后回升,中部洲滩不如北部河道段剧烈但大面积的淹没频率下降,南部子湖泊的淹没频率则基本没变;(3)植被丰度对淹没频率具有密切的响应关系,两者呈中间高两边低的"n"形分布,当淹没频率为40%时高植被丰度的像元数最多。(4)淹没频率与植被丰度的关系指示着鄱阳湖湿生植被在空间上的积极演变。

关 键 词:MODIS  混合像元分解  水体淹没频率  鄱阳湖  湿地植被
收稿时间:2017/10/23 0:00:00
修稿时间:2018/5/27 0:00:00

Changes in inundation frequency in Poyang Lake and the response of wetland vegetation
GU Juan,QIN Yi,WANG Xin,MA Jingyu,GUO Zhonghao,ZOU Lejun and SHEN Xiaohua.Changes in inundation frequency in Poyang Lake and the response of wetland vegetation[J].Acta Ecologica Sinica,2018,38(21):7718-7726.
Authors:GU Juan  QIN Yi  WANG Xin  MA Jingyu  GUO Zhonghao  ZOU Lejun and SHEN Xiaohua
Institution:School of Earth Sciences, Zhejiang University, Hangzhou 310025, China,School of Earth Sciences, Zhejiang University, Hangzhou 310025, China,School of Earth Sciences, Zhejiang University, Hangzhou 310025, China,School of Earth Sciences, Zhejiang University, Hangzhou 310025, China,School of Earth Sciences, Zhejiang University, Hangzhou 310025, China,School of Earth Sciences, Zhejiang University, Hangzhou 310025, China and School of Earth Sciences, Zhejiang University, Hangzhou 310025, China
Abstract:In lake ecosystems, the timing, duration, and frequency of inundation greatly determines the wetland/aquatic ecological conditions, and influence wetland plant regeneration and species richness. Under increasing impacts from human activities and climate change, a better understanding of how hydrological changes influence wetland vegetation is required. In this study, we analyze the spatial distribution of the inundation frequency and its temporal variation during the period from 2000 to 2015 in Poyang Lake by means of MODIS image interpretations method based on mixed pixel decomposition model derived from the spectrum characteristics of ground features. The relationship between the inundation frequency and the vegetation abundance is further discussed. The main results are as follows:(1) the spatial distribution of inundation frequency in the receding period shows a decreasing trend from north to south on the whole. Areas with high inundation frequency are distributed in patches. (2) The inundation frequency of the whole lake decreased from 2000 to 2010, then recovered to a relative stable state from 2011 to 2015. In different regions of the lake, the temporal changes of inundation frequency in the last 15 years shows different trends. The inundation frequency of the northern river channel and that of the central shoal shows trends similar to that of the whole lake, except that the changes of inundation frequency in the central shoal are gentler. On the other hand, the inundation frequency of the southern sub-lake is basically unchanged. (3) The vegetation abundance closely responds to the inundation frequency of Poyang Lake. The "n" form distribution on the scatter diagram of vegetation abundance versus inundation frequency shows that there were high values in the central part and low values on both sides, and the vegetation abundance reaches a maximum when the inundation frequency equals~40%. (4) The relationship between the inundation frequency and the vegetation abundance indicates a positive spatial evolution of emergent aquatic vegetation in Poyang Lake.
Keywords:MODIS  pixels spectral decomposition model  inundation frequency  Poyang Lake  wetland vegetation
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