基于MODIS反演的2000—2011年江西省植被叶面积指数时空变化特征

吴国训; 阮宏华; 李显风; 居为民; 耿君

doi:10.3969/j.issn.1000-2006.2013.01.002

吴国训,阮宏华,李显风,居为民,耿君

南京林业大学学报（自然科学版） ›› 2013, Vol. 37 ›› Issue (01) : 11-17.

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南京林业大学学报（自然科学版） ›› 2013, Vol. 37 ›› Issue (01) : 11-17. DOI: 10.3969/j.issn.1000-2006.2013.01.002

研究论文

基于MODIS反演的2000—2011年江西省植被叶面积指数时空变化特征

吴国训^1,2,阮宏华^1*,李显风³,居为民⁴,耿君¹

作者信息 +

Spatial-temporal variations of leaf area index(LAI)in Jiangxi province during 2000—2011 based on MODIS data

WU Guoxun^1,2,RUAN Honghua^1*,LI Xianfeng³,JU Weimin⁴,GENG Jun¹

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文章历史 +

摘要

叶面积指数(LAI)是陆地植被的重要结构参数之一,是陆地生态系统生产力模型和气候、水文、生物地球化学等模型的关键输入参数。笔者基于MODIS-MOD09A1反射率数据,利用4-尺度几何光学模型反演了2000—2011年江西省植被LAI。结果表明:(1)江西省植被LAI呈现出明显的季节变化,1年中1—2月LAI值较低(最低为1月,平均值为0.85),3—4月随着植被生长,LAI值逐渐增大,到6—8月,LAI达到最大值,最大值为7月的4.8,约为最小月份平均值的5.6倍,9月以后,LAI值逐渐减少;(2)2000—2007年江西全省生长季LAI呈增加趋势,2008—2011年LAI平均值呈下降趋势,2000—2011年全省生长季LAI平均值呈下降趋势,平均下降0.048;(3)江西省不同植被类型的LAI值差异较大,2000—2011年间,各植被类型LAI平均值从大到小顺序为:常绿针叶林(5.67)、常绿阔叶林(4.57)、混交林(4.01)、落叶阔叶林(3.17)、农作物/自然植被混合(2.08)、高郁闭度灌木(1.92)、农作物(1.85)。2000—2011年江西全省植被LAI的平均值为3.60。

Abstract

Leaf area index(LAI)is an important parameter of terrestrial ecosystem models. This paper analyzed the spatial-temporal variations of LAI in Jiangxi province during 2000—2011, which was retrieved from MODIS-MOD09A1 dataset、land cover and 4-scale geometric optical model. The results showed that:(1)the LAI presented noticeable seasonal variations, and the highest value of which(July, 4.8)was about 5.6 times of the lowest(January, 0.85);(2)During from 2000 to 2011, the average LAI of growing seasons decreased 0.048 per year,while average LAI of growing season increased 0.125 per year during 2000 to 2007, but the average LAI of growing season decreased during 2008—2011;(3)The average LAI during 2000 to 2011 exhibited considerable changes among different vegetation types. Evergreen needle leaf forest had the highest LAI(5.67), followed by evergreen broad leaf forest(4.57), mixed forest(4.01),deciduous broad leaf forest(3.17),mixed crop and natural vegetation(2.08),closed shrub(1.92),crop(1.85). The average LAI of whole province was 3.60 during 2000—2011.

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吴国训,阮宏华,李显风,居为民,耿君. 基于MODIS反演的2000—2011年江西省植被叶面积指数时空变化特征[J]. 南京林业大学学报（自然科学版）. 2013, 37(01): 11-17 https://doi.org/10.3969/j.issn.1000-2006.2013.01.002

WU Guoxun,RUAN Honghua,LI Xianfeng,JU Weimin,GENG Jun. Spatial-temporal variations of leaf area index(LAI)in Jiangxi province during 2000—2011 based on MODIS data[J]. JOURNAL OF NANJING FORESTRY UNIVERSITY. 2013, 37(01): 11-17 https://doi.org/10.3969/j.issn.1000-2006.2013.01.002

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基金

收稿日期:2012-04-23 修回日期:2012-09-24
基金项目:国家林业公益性行业科研专项项目(200804006)
第一作者:吴国训,博士生。*通信作者:阮宏华,教授。E-mail: hhruan@njfu.edu.cn。
引文格式:吴国训,阮宏华,李显风,等. 基于MODIS反演的2000—2011年江西省植被叶面积指数时空变化特征[J]. 南京林业大学学报:自然科学版,2013,37(1):11-17.