1982～2006年中国东部植被覆盖度的变化

张学珍; 朱金峰

doi:10.3878/j.issn.1006-9585.2012.11174

1982～2006年中国东部植被覆盖度的变化

doi: 10.3878/j.issn.1006-9585.2012.11174

张学珍¹,
朱金峰²

1.
中国科学院地理科学与资源研究所, 北京 100101
2.
中国科学院遥感应用研究所, 北京 100101

基金项目: 国家自然科学基金项目41001122;全球变化研究国家重大科学研究计划2010CB950903、2010CB951801

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出版历程
- 收稿日期: 2011-11-07
- 修回日期: 2012-05-03

Variations in Fractional Vegetation Coverage over Eastern China during 1982-2006

ZHANG Xuezhen¹,
ZHU Jinfeng²

1.
Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101
2.
Institute of Remote Sensing Application, Chinese Academy of Sciences, Beijing 100101

摘要

摘要: 陆地植被是影响地表水热通量,乃至气候的重要因素,植被覆盖度是气候模式(陆面过程模型)中的关键参数。为更全面认识中国东部植被覆盖度变化的时空特征,以便于今后研究陆地植被变化对气候的反馈效应,利用NOAA AVHRR-NDVI数据集,采用像元二分模型法,计算了中国东部(105°E以东)1982～2006年的植被覆盖度,并对其空间分布特征与时间演变过程进行了分析。结果表明:(1)研究区多年平均植被覆盖度为0～84.2%, 呈现南高北低、东高西低的空间分布特征,南北差异在冬季最大,夏季最小;(2)森林、灌丛、农业植被和草原的年平均植被覆盖度依次减小,分别是49.9%、44.7%、40.4%和31.1%,并且植被覆盖度的季节变幅也依植被类型而异,其中森林的季节变幅最大,达31.5%,其次是灌丛,为27.7%,草原的季节变幅最小,为15.3%;(3)1982～2006年中国东部超过74%的地区植被覆盖度呈增加趋势,其中黄淮海平原、关中地区以及东北平原增幅相对较大,前两个地区主要表现为春季和冬季增加,后一地区则主要表现为夏季和秋季增加;在植被覆盖度降低的区域中,长三角、珠三角的降低趋势最强。上述结论为进一步研究中国东部地—气相互作用提供了科学基础。
- 中国东部 /
- 植被覆盖度 /
- 归一化差值植被指数(NDVI)
Abstract: This study calculated the fractional vegetation coverage (FVC) using NOAA AVHRR-NDVI data and the dimidiate pixel model and analyzed the mean FVC spatial pattern and the trends in variations in the FVC across eastern China (east of 105°E) during 1982-2006. The results show: (1) The mean spatial variations in the study area have a range of 0-84.2% and exhibit a pattern featuring high FVC in the south and low FVC in the north; the south-north gradient was higher in winter than in summer; (2) forest, shrub, crops, and grassland have annual mean FVCs of 49.9%, 44.7%, 40.4%, and 31.1%, respectively; among the types of natural vegetation, forest exhibits the largest seasonal differences (as high as 31.5%), shrub has intermediate seasonal differences of about 27.7%, and grasslands have the smallest seasonal differences (about 15.3%); (3) during 1982-2006, more than 74% of the study area exhibited an increasing trend in the Yellow River-Huaihe River-Haihe River (YHH) reaches, in the Guanzhong (GZ) area, and on the Northeast China Plain (NECP). The FVC increases in the YHH and GZ areas occurred mainly in the spring and winter, whereas those in the NECP occurred mainly in summer and autumn. The Yangtze River Delta and Pearl River Delta exhibited significant decreasing trends. These findings are expected to be valuable for investigating land-atmosphere interaction in eastern China.
- Eastern China /
- Fractional vegetation coverage /
- Normalized difference vegetation index (NDVI)

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