长江流域资源与环境 >> 2013, Vol. 22 >> Issue (06): 705-.

• 自然资源 • 上一篇    下一篇

基于MODIS的鄱阳湖湿地植被变化及其对水位的响应研究

叶 春 | 刘元波 | 赵晓松 | 吴桂平   

  1. (1 中国科学院南京地理与湖泊研究所|江苏 南京 210008; 2中国科学院大学|北京 100049
  • 出版日期:2013-06-20

ANALYSIS OF POYANG LAKE WETLAND VEGETATION GROWTH DYNAMICS
AND ITS RESPONSE TO LAKE WATER LEVEL BASED ON MODIS

YE Chun1|2|LIU Yuanbo1|ZHAO Xiaosong1|WU Guiping1   

  1. (1. Nanjing Institute of Geography and Limnology|Chinese Academy of Sciences|Nanjing 210008|China; 
    2. University of Chinese Academy of Sciences|Beijing 100049|China
  • Online:2013-06-20

摘要:

针对鄱阳湖水情变化如何影响湖区湿地植被生长过程的问题,在鄱阳湖国家级自然保护区内的蚌湖—吴城生态断面上,选取3个梯度分布MODIS像元样点,基于2001~2010年MODIS 增强型植被指数(EVI)时间序列,分析了近10 a来退水期植被生长动态变化过程;结合星子站水位资料,探讨了鄱阳湖退水期水位变化对湿地植被生长的影响。结果表明:各样点EVI年内均值表现为先上升后下降的单峰特征,多年平均值在10月份最大,高程越高的样点其EVI达到年最大值的时间越早;不同水位持续长短及其起讫时期影响植被的生长变化,EVI均值与生长期的拟合优度(075)高于最大值与生长期的拟合优度(049);样点每提前出露10 d,EVI均值约升高002,[JP3]二者相关性R2达到055。研究结果对湖区植被资源管理以及湖泊水位调控效应研究等具有积极的参考意义

Abstract:

The Poyang Lake is the largest freshwater lake in China and it is one of the most important wetlands in the world Wetland vegetation plays an important role in material circulation and energy flow as well as other ecological process Plant community in wetland exhibits significant responses to water content and water level fluctuation in wetland As for the Poyang Lake,water level varies significantly within an order of 10m in a single year,with the bottom of lake emerging at low water level Only in these dry seasons hygrophilous vegetation,such as Carex can grow Hence,water levelinduced vegetation variations have been substantially discussed in recent literatures The relationship between vegetation growth and water level dynamics has been currently carried out The launch of MODIS (moderate resolution imaging sepctroradiometer)provided an opportunity for us to study the vegetation growth dynamic process In this study,time series of Enhanced Vegetation Index (EVI) calculated from multiyear MODIS images were used to analyze vegetation variations in the course of low water level for the year 20012010 For this purpose,three hierarchically distributed MODIS pixels were selected along the BanghuWucheng ecological transect in the Poyang Lake National Nature Reserve (PLNNR) The average Wusong elevation of the three sample points was 138m,152m,158m,respectively More over,we also explored the influence on vegetation growth imposed by fluctuation of water level assisted with data from Xingzi hydrometric station Results indicated that intraannual EVI of each sampling site exhibited a trend of increasing firstly and then decreasing The annual mean EVI culminated in October and pixel with higher terrain corresponded to the early occurrence of peak EVI No significant trends were found in the interannual EVI.  Water level determines time span of outcrop emergence,thereby affects the growing season of vegetation Mean EVI had a better goodness of fit(075) with the growing phase than that of the maximum of EVI (0.49).  Mean EVI would increase by 002 when the bottom of sample site emergenced 10 days in advance compared with the year 2005 as reference year,and the determination coefficient reached 0.55 In the typical dry year (2006),the three sample points with high,middle and low elevation were exposed 72,60,52 days in advance respectively,and the mean EVI of each sample significantly increased by 0.12,0.16 and 0.11 In the typical wet year (2002),only the maximum EVI significantly increased due to more precipitation in the study period We can conclude that  the longlasting water level extends the length of the vegetation growth It is propitious to the growth of wetland plant community And the precipitation is an important climatic factor for the vegetation Results can be used to guide the vegetation resource management in the Poyang Lake and the lake level regulation.

No related articles found!
Viewed
Full text


Abstract

Cited

  Shared   
  Discussed   
[1] 罗专溪,张 远,郑丙辉,富 国,陆兆华. 三峡水库蓄水初期水生态环境特征分析[J]. 长江流域资源与环境, 2005, 14(6): 781 -784 .
[2] 陈 诚,陈 雯 . 盐城市沿海的适宜开发空间选择研究[J]. 长江流域资源与环境, 2008, 17(5): 667 .
[3] 李晓文,方精云,朴世龙. 上海城市土地利用形成、变化及其空间作用机制[J]. 长江流域资源与环境, 2006, 15(1): 34 -40 .
[4] 李加林,许继琴,童亿勤,杨晓平,张殿发. 杭州湾南岸滨海平原土地利用/覆被空间格局变化分析[J]. 长江流域资源与环境, 2005, 14(6): 709 -713 .
[5] 李玉辉,李忠德,张丹丹,李兆林 ,周顺吉. 石林风景名胜区对乡村经济发展的影响[J]. 长江流域资源与环境, 2004, 13(1): 18 -23 .
[6] 黄真理. 国内外大型水电工程生态环境监测与保护[J]. 长江流域资源与环境, 2004, 13(2): 101 -108 .
[7] 杨志荣,吴次芳, 靳相木, 姚秋萍. 基于DEA模型的城市用地经济效益比较研究[J]. 长江流域资源与环境, 2009, 18(1): 14 .
[8] 吴虹月,包维楷,王 安. 外来种入侵对乡土生物多样性的影响机制[J]. 长江流域资源与环境, 2004, 13(1): 40 -46 .
[9] 徐新良, 庄大方, 贾绍凤, 胡云峰. GIS环境下基于DEM的中国流域自动提取方法[J]. 长江流域资源与环境, 2004, 13(4): 343 -348 .
[10] 徐宪立,张科利,刘 雯,孔亚平, 陈济丁. 青藏公路路堤边坡水土保持措施及效益分析[J]. 长江流域资源与环境, 2008, 17(4): 619 .