江苏科技信息
江囌科技信息
강소과기신식
JIANGSU SCIENCE & TECHNOLOGY INFORMATION
2015年
13期
9-12
,共4页
植被覆盖估算%动态变化%植被指数%黄河三角洲
植被覆蓋估算%動態變化%植被指數%黃河三角洲
식피복개고산%동태변화%식피지수%황하삼각주
estimation of vegetation coverage%dynamic changes%vegetation index%the Yellow River Delta
植被覆盖度是重要的生态环境参数之一。文章以黄河三角洲为例,运用归一化植被指数(NDVI)和像元二分模型对黄河三角洲地区2004年和2010年的植被覆盖度进行了估算,将黄河三角洲植被覆盖划分为4个等级:低植被覆盖区、中植被覆盖区、高植被覆盖区和全植被覆盖区,并分析其变化趋势。结果表明,低植被覆盖区面积最大,主要位于沿海、中部地区和黄河以南,中植被覆盖区主要位于北部沿海地区,全植被覆盖区主要位于黄河及其支流沿岸。从植被覆盖变化趋势看,2004-2010年间低植被覆盖区、中植被覆盖区和全植被覆盖区面积都有所减少,其中低植被覆盖区减少面积最大,达312.39km2,全植被覆盖区面积变化幅度最大,变化率为76.8%。高植被覆盖区面积增加了352.31km2,变化率为30.6%。利用NDVI植被指数和像元二分模型对黄河三角洲地区植被覆盖度进行遥感估算,可以快速有效地分析不同时期的植被覆盖变化,方法简单可行,结果可为黄河三角洲地区水土保持和生态环境保护政策制定提供依据。
植被覆蓋度是重要的生態環境參數之一。文章以黃河三角洲為例,運用歸一化植被指數(NDVI)和像元二分模型對黃河三角洲地區2004年和2010年的植被覆蓋度進行瞭估算,將黃河三角洲植被覆蓋劃分為4箇等級:低植被覆蓋區、中植被覆蓋區、高植被覆蓋區和全植被覆蓋區,併分析其變化趨勢。結果錶明,低植被覆蓋區麵積最大,主要位于沿海、中部地區和黃河以南,中植被覆蓋區主要位于北部沿海地區,全植被覆蓋區主要位于黃河及其支流沿岸。從植被覆蓋變化趨勢看,2004-2010年間低植被覆蓋區、中植被覆蓋區和全植被覆蓋區麵積都有所減少,其中低植被覆蓋區減少麵積最大,達312.39km2,全植被覆蓋區麵積變化幅度最大,變化率為76.8%。高植被覆蓋區麵積增加瞭352.31km2,變化率為30.6%。利用NDVI植被指數和像元二分模型對黃河三角洲地區植被覆蓋度進行遙感估算,可以快速有效地分析不同時期的植被覆蓋變化,方法簡單可行,結果可為黃河三角洲地區水土保持和生態環境保護政策製定提供依據。
식피복개도시중요적생태배경삼수지일。문장이황하삼각주위례,운용귀일화식피지수(NDVI)화상원이분모형대황하삼각주지구2004년화2010년적식피복개도진행료고산,장황하삼각주식피복개화분위4개등급:저식피복개구、중식피복개구、고식피복개구화전식피복개구,병분석기변화추세。결과표명,저식피복개구면적최대,주요위우연해、중부지구화황하이남,중식피복개구주요위우북부연해지구,전식피복개구주요위우황하급기지류연안。종식피복개변화추세간,2004-2010년간저식피복개구、중식피복개구화전식피복개구면적도유소감소,기중저식피복개구감소면적최대,체312.39km2,전식피복개구면적변화폭도최대,변화솔위76.8%。고식피복개구면적증가료352.31km2,변화솔위30.6%。이용NDVI식피지수화상원이분모형대황하삼각주지구식피복개도진행요감고산,가이쾌속유효지분석불동시기적식피복개변화,방법간단가행,결과가위황하삼각주지구수토보지화생태배경보호정책제정제공의거。
The vegetation coverage is one of the important ecological parameters.Remote sensing image can reflect the information and its trend of vegetation coverage at different spatial scales.So the remote sensing monitoring is an important means of obtaining the regional vegetation coverage parameters.In this paper,the normalized difference vegetation index(NDVI) and two sub-pixel model were used on the vegetation coverage estimation of the Yellow River Delta.And the dates of the Yellow River Delta in September 2004 and September 2010 were used to conduct a longitudinal comparison.The result indicated that the high vegetation cover distribution was more concentrated in the northwest and eastern regions,and the middle vegetation cover was mainly distributed in the northern coastal areas;the high coverage of the vegetation of the region was distributed in the northwest and along the Yellow River , while the vegetation coverage of the south bank was low;the vegetation coverage of coastal areas was low ,while the vegetation coverage of the inland was high.The areas of low vegetation coverage,the middle vegetation coverage and the full vegetation coverage reduced from 2004 to 2009 obviously.The regions with high have increased with the changing rate of 30.6%.