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遥感技术与应用
模型与反演     
不同覆盖度下小麦农田土壤对NDVI影响模拟分析
方雨晨1,2,3,王培燕1,2,3,田庆久1,2,3
(1.南京大学国际地球系统科学研究所,江苏 南京210023;
2.江苏省地理信息技术重点实验室,江苏 南京210023;
3.江苏省地理信息资源开发与利用协同创新中心,江苏 南京210023)
Simulation and Analysis on the Influence of Soil Background of Wheat Farmland on NDVI under Different Vegetation Coverage
Fang Yuchen1,2,3,Wang Peiyan1,2,3,Tian Qingjiu1,2,3
(1.International Institute for Earth System Science,Nanjing University,Nanjing 210023,China;
2.Jiangsu Provincial Key Laboratory of Geographic Information Science and Technology,
Nanjing 210023,China;3.Jiangsu Provincial Collaborative Innovation Center of GeographicInformation Resources Development and Utilization,Nanjing210023,China)
 全文: PDF(3155 KB)  
摘要:
生长于不同土壤类型背景条件下的相同长势小麦农田遥感像元尺度的归一化植被指数(NDVI)有很大差异,也一直困扰着利用NDVI进行小麦长势有效监测和精确评价。拟定小麦冠层光谱不变即小麦冠层NDVI为一常数条件下,选择反射率差异较大的我国9种典型土壤类型作为土壤背景,由小麦冠层和土壤背景的不同线性混合比模拟计算遥感像元尺度上的植被覆盖度,研究不同土壤类型背景对小麦农田NDVI信息的影响。研究结果表明:同一土壤类型背景条件下,随着植被覆盖度逐渐增加,小麦农田NDVI总体表现为增长的趋势,反之亦然;不同类型土壤背景对小麦农田NDVI造成很大差异,当植被覆盖度大于25%时,随着植被覆盖度的增加对小麦农田NDVI影响差异性逐渐减小;不同类型土壤背景也导致小麦农田NDVI对植被覆盖度的敏感性有明显差异,较低反射率土壤背景条件下的敏感性随着植被覆盖度增长呈现曲线下降的趋势,较高反射率土壤背景条件下敏感性随着植被覆盖度的增长而单调增加,为不同类型土壤背景的各小麦生长期遥感NDVI信息估算频次选择提供依据。
关键词: NDVI光谱小麦土壤植被覆盖度    
Abstract: It is quite confusing to effectively monitor and precisely evaluate growing conditions of wheat by using normalized differential vegetation index (NDVI)which is based on pixel scale as they are significantly different when acquired by the same growth status wheat with different background of soil types.This paper selects 9 typical soil types in our country as background with the wheat canopy spectrum is fixed which means the NDVIc is a constant value to study the influence of different soil background types on NDVI of wheat and analyze the sensitivity of NDVI of wheat to the vegetation coverage simulated by diverse liner mixed ratio of wheat canopy and soil background.The results show that:(1)wheat NDVI of farmland increases along with the increase of vegetation coverage under the same of soil background type,and vice versa;(2)wheat NDVI of farmland vary greatly with different soil background types,and the difference decrease while the vegetation coverage exceed 25%;(3)NDVI sensitivity also shows a quite difference to vegetation coverage under the diverse soil background types.With the increase of vegetation coverage,NDVI sensitivity decreases with the lower\|reflectance soil background while it increases monotonously with the higher reflectance soil background.It provides the foundation for the times of calculating the remote sensing’s NDVI information of all wheat growing periods under different types of soil background.
Key words: NDVI    Spectra    Wheat    Soil    Vegetation coverage
收稿日期: 2016-08-03 出版日期: 2017-09-13
:  TP 79  
基金资助:
作者简介: 方雨晨(1992-),女,安徽安庆人,硕士研究生,主要从事高/多光谱遥感与遥感信息定量化研究。 Email :fangycnju@foxmail.com
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引用本文:

方雨晨,王培燕,田庆久. 不同覆盖度下小麦农田土壤对NDVI影响模拟分析[J]. 遥感技术与应用, 10.11873/j.issn.1004-0323.2017.4.0660.

链接本文:

http://www.rsta.ac.cn/CN/Y2017/V32/I4/660

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