基于MODIS的重庆市植被指数对地形的响应

doi:10.3969/j.issn.1000-6362.2012.04.017

中国农业气象 ›› 2012, Vol. 33 ›› Issue (04): 587-594.doi: 10.3969/j.issn.1000-6362.2012.04.017

基于MODIS的重庆市植被指数对地形的响应

陈艳英，唐云辉，张建平，游扬声，杨雪梅

1重庆市气象科学研究所，重庆401147；2重庆大学土木工程学院，重庆400045；3山地城镇建设与新技术教育部重点实验室/重庆大学，重庆400030

收稿日期:2012-02-09 出版日期:2012-11-20 发布日期:2013-02-26
作者简介:陈艳英（1974-），女，蒙古族，辽宁朝阳人，硕士，高级工程师，主要从事气候资源、GIS、RS应用研究。Email：chenyanying1618@163.com
基金资助:
重庆市科技攻关项目“重庆市不同气候年型粮食种植风险及对策研究”（CSTC，2011AC1168）；中央高校项目“分布相似度及其在气温资料预处理中的应用”(CDJZR11200003)；国家科技支撑计划课题“重大农业气象灾害立体监测与动态评估技术研究”（2011BAD32B01）

Response of Vegetation Index Based on MODIS to Topographic Factors in Chongqing

CHEN Yan ying，TANG Yun hui，ZHANG Jian ping,YOU Yang sheng,YANG Xue mei

1Chongqing Institute of Meteorological Sciences，Chongqing 401147,China;2College of Civil Engineering，Chongqing University，Chongqing 400045;3Key Laboratory of New Technology for Construction of Cities in Mountain Area,Ministry of Education /Chongqing University，Chongqing 400030

Received:2012-02-09 Online:2012-11-20 Published:2013-02-26

摘要/Abstract

摘要： 利用重庆市2011年3-11月晴空条件下逐日MODIS数据，采用最大值合成法合成逐旬（月、年）归一化植被指数，将各旬植被指数按高度和坡度分别分成6个高度特征区和5个坡度特征区，对各特征区植被指数进行对比分析。结果表明，（1）区域平均植被指数随特征区高度或坡度值增加呈增大的趋势。高程1500m以下相邻区域间NDVI值相差3.5～8.7，且植被指数随高度升高增加较快，1500m以上相邻区域间NDVI值相差在1.9以内，随高度升高增加缓慢；坡度25°以下相邻区域间NDVI值相差3.0～8.0，且植被指数随坡度增加增大较快，25°以上相邻区域间NDVI相差0.2～1.0，随坡度增大增加缓慢。（2）大于平均植被指数的频率与高度和坡度的相关分析表明，在海拔较高的特征区，植被指数高值格点的频率也较大，该频率与海拔高度间呈极显著正相关关系，相关系数为0.9552（P＜0.01）；而植被指数与坡度无显著的相关性，相关系数为-0.3000。（3）按高度分区比按坡度分区更能体现植被指数的地区差异性。各高度特征区高程与植被指数的相关系数在0.9541～0.9871（P＜0.001），各坡度特征区坡度与植被指数的相关系数在0.9457～0.9723（P＜0.01）。研究结果说明，重庆市地形因素对植被指数有较大的影响，且高度因素对植被指数及其分布的影响较坡度更明显。

关键词: 重庆市, 高度特征区, 坡度特征区, 归一化植被指数

Abstract: Based on the daily MODIS data under clear sky condition from March to November 2011 in Chongqing，authors computed the 10-day (monthly，yearly) NDVI by using MVC method.The serial NDVI enlarged 100 times in different period of time were divided into 6 characteristic districts with different altitudes which were below 400m，400-800m，800-1200m，1200-1500m，1500-2000m and above 2000m and 5 characteristic districts with different slopes which were below 5°，5°-15°，15°-25°，25°-35° and above 35°，and the NDVI of each district was analyzed.The results showed that (1) The NDVI augmented with the increase of altitude or lope NDVI in districts below 1500m increased conspicuously and the added value was 3.5 to 8.7 between neighboring districts，but in districts above 1500m increased inconspicuously and the added value was <1.9 between neighboring districts NDVI in districts below 25°increased conspicuously and the added value was 3.0 to 8.0，but in the districts above 25°increased inconspicuously and the added value was 0.2 to 1.0(2)According to analysis，in higher districts，the grid frequency of NDVI above the average augmented with the increase of altitude.The correlation coefficient between NDVI and altitude was 0.9552（P＜0.01）while that between NDVI and slope was -0.3000.The results showed that the grid frequency of NDVI above the average augmented with increase of altitude while there was no significant correlation between grid frequency of NDVI above the average and slope.(3)The difference of NDVI in different districts was reflected more conspicuously by altitude division than by slope division.The correlation coefficient was more than 0.9541 between NDVI and altitude（P＜0.001）,and was 0.9457-0.9723 between NDVI and slope（P＜0.01）.All the results above showed that in Chongqing city，the topographic factors had obvious effect on NDVI，and the effect of altitude on NDVI was more conspicuously than that of slope.

Key words: Chongqing city, Characteristic district with different altitude, Characteristic district with different slope, NDVI

中图分类号:

S127

陈艳英，唐云辉，张建平，游扬声，杨雪梅. 基于MODIS的重庆市植被指数对地形的响应[J]. 中国农业气象, 2012, 33(04): 587-594.

CHEN Yan ying，TANG Yun hui，ZHANG Jian ping,YOU Yang sheng,YANG Xue mei. Response of Vegetation Index Based on MODIS to Topographic Factors in Chongqing[J]. Chinese Journal of Agrometeorology, 2012, 33(04): 587-594.

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基于MODIS的重庆市植被指数对地形的响应

Response of Vegetation Index Based on MODIS to Topographic Factors in Chongqing

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