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| 基于NOAA NDVI 的中国植被绿度始期变化 | |
| 引用本文： | 武永峰,李茂松,刘布春,白文波,蒋卫国.基于NOAA NDVI 的中国植被绿度始期变化[J].地理科学进展,2008,27(6):32-40. |
| 作者姓名： | 武永峰 李茂松 刘布春 白文波 蒋卫国 |
| 作者单位： | 1. 中国农业科学院农业环境与可持续发展研究所,北京,100081;农业部农业环境与气候变化重点开放实验室,北京,100081 2. 北京师范大学地表过程与资源生态国家重点实验室,北京,100875 |
| 基金项目： | 国家科技支撑计划课题(2006BAD04B07). |
| 摘 要： | 在对1982-1999 年NOAA/AVHRR NDVI 数据集进行缺失处理、平滑处理以及残存误差订正的基础上，利 用基于NDVI 累积频率曲线的Logistic 拟合模型计算生成了各年份全国植被绿度始期数据， 统计了所有气候植被 类型和生物气候区的平均绿度始期，并对不同空间类型植被绿度始期的年际变化趋势与显著性程度、时空变化特 征等做了统计分析。结果表明：①全国大部分地区植被绿度始期呈提前趋势，其中华北平原、贵州东北部、湖南中南 部山地丘陵区、广东西部地区以及内蒙古高原东部典型草原区等明显提前。②植被绿度始期年际波动程度高于10 天的地区主要分布在农业植被区、常绿植被区和草原区，其中河套平原、关中盆地、河南中东部、川西盆地、广东、藏 东南边缘地带以及台湾部分地区超过15 天。③除温带荒漠以外，其它所有植被类型绿度始期均为提前趋势。④从 各生物气候区空间变化来看，随着年积温降低和干旱指数增大，植被绿度始期大致呈推迟趋势；从年际变化来看， 华南、华东、华中、华北、内蒙、东北和青藏区植被绿度始期提前，陕晋和西北区植被绿度始期推迟。⑤受1982～1983 年厄尔尼诺事件影响，各空间类型植被绿度始期分别表现为推迟和提前趋势。 |
| 关 键 词： | NDVI 植被绿度始期 植被类型 生物气候区 中国 |
| 收稿时间： | 2008-04-01 |
| 修稿时间： | 2008-09-01 |
Changes of Chinese Beginning Date of Vegetation Greenness Period Based on NOAA NDVI |
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| WU Yongfeng,LI Maosong,LIU Buchun,BAI Wenbo,JIANG Weiguo.Changes of Chinese Beginning Date of Vegetation Greenness Period Based on NOAA NDVI[J].Progress in Geography,2008,27(6):32-40. | |
| Authors: | WU Yongfeng LI Maosong LIU Buchun BAI Wenbo JIANG Weiguo |
| Institution: | 1. Institute of Environment and Sustainable Development for Agriculture, Chinese Academy of Agricultural Science, Beijing 100081, China; 2. Key Laboratory of Agro-Environment &|Climate Change, Ministry of Agriculture, Beijing 100081, China; 3. State Key Laboratory of Earth Surface Processes and Resource Ecology, Beijing Normal University, Beijing 100875, China |
| Abstract: | Beginning date of greenness period of vegetation(BGP)is closely related to seasonal dynamics of the lower atmosphere and is therefore an important variable in influences and feed-back mechanisms of global climate variation to terrestrial ecosystem.Detecting BGP using remote-ly sensed data at regional or global scales has become an advanced topic in geography and ecolo-gy.Based on the processed NOAA/AVHRR NDVI data,the study is to use Logistic fitting model on cumulative frequency of NDVI to compute BGP of China by pixels from 1982 to 1999,count the annual average BGP of every vegetation type and bio-climate district,and analyze the inter-annual change trends,spatio-temporal dynamic change feature of BGP of various spatial types.The results indicate that:(1)BGP have an advance trend in most regions and obviously advance in North China Plain,northeast Guizhou,the middle and south Hunan,west Guangxi and typical grassland area of east Inner Mongolia.(2)The regions in which inter-annual fluctuation of BGP are over 10 days are mainly distributed in the area covered with agricultural vegetation types,the areas covered with evergreen vegetation types and the areas covered with steppe vegetation types.Thereinto,the fluctuation of BGP in Hetao plain,Guanzhong basin,east Henan,west Sichuan basin,Guangdong,Taiwan and so on,are over 15 days.(3)BGPs of the other vegetation types ex-cept temperate desert show an advance trends.(4)With the reduction of annual accumulative tem-perature and increase of drought indices,BGP of various bio-climate areas delay.An advance of BGP is found in South China,East China,Central China,North China,Inner Mongolia,Northeast China and Tibet,whereas a delay occurred in Shaanxi,Shanxi and Northwest China.(5)BGP of all vegetation types evidently delay in 1982,1983 or 1984,which may be associated with the strong EI-Nino effect in the 1982-1983 period. |
| Keywords: | NDVI beginning date of vegetation greenness period vegetation type bio-climate area China |
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