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| 荒漠绿洲NDVI与气候、水文因子的相关分析 | |
| 引用本文： | 张远东,徐应涛,顾峰雪,潘晓玲.荒漠绿洲NDVI与气候、水文因子的相关分析[J].植物生态学报,2003,27(6):816-822. |
| 作者姓名： | 张远东 徐应涛 顾峰雪 潘晓玲 |
| 作者单位： | 1. 中国林业科学研究院森林生态环境与保护研究所,北京,100091 2. 浙江师范大学计算机科学与工程学院,浙江金华,321004 3. 新疆大学资源与环境科学学院,乌鲁木齐,830046 |
| 基金项目： | 国家基础研究重点规划项目 (G19990 43 5 0 3 ) |
| 摘 要： | 通过利用1992～1996年NOAA/AVHRR逐旬的归一化植被指数（NDVI）数据和阜康气候、水文资料，分别对绿洲和荒漠进行了NDVI与气候、水文因子间的相关分析，得出了一些初步结论：绿洲与荒漠NDVI具有不同的季节变化规律；与绿洲NDVI相关显著的因子依次为气温、地下水位和降水， |
| 关 键 词： | NDVI 气候因子 水文因子 时空尺度 |
| 修稿时间： | 2002年12月10 |
CORRELATION ANALYSIS OF NDVI WITH CLIMATE AND HYDROLOGICAL FACTORS IN OASIS AND DESERT |
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| ZHANG Yuan-Dong,XU Ying-Tao,GU Feng-Xue and PAN Xiao-Ling.CORRELATION ANALYSIS OF NDVI WITH CLIMATE AND HYDROLOGICAL FACTORS IN OASIS AND DESERT[J].Acta Phytoecologica Sinica,2003,27(6):816-822. | |
| Authors: | ZHANG Yuan-Dong XU Ying-Tao GU Feng-Xue and PAN Xiao-Ling |
| Abstract: | The interactions between vegetation and climate are always an important domain in ecological research. NDVI (Normalized difference vegetation index) is an important index that reflects the radiation_absorbing characteristic of vegetation and the climatic stress action. Since 1990, the relationships between NOAA/AVHRR NDVI and climatic factors have been studied in many papers and the relative conclusions in arid zones differ completely. It is very important to clear up the problem in the application of NDVI to eco_environmental monitoring and research in arid zones. By means of the digital NOAA/AVHRR NDVI images with 1 km spatial resolution and monthly climatic and hydrological data set in Fukang from 1992 to 1996, the correlation of NDVI with climate and hydrological factors are analyzed in oasis and desert respectively in this paper. NDVI images come from AVHRR database of United States Geological Survey, which have been treated with atmosphere rectification, cloud checkout, quality control and maximum value composite every ten days. NDVI images are registered to 0.3-0.7 pixel error according to the mountains and water system map in Xinjiang. Oasis NDVI is clipped with farm boundary in Fukang and desert NDVI is clipped with desert grassland boundary. Monthly NDVI mean values in oasis and desert are calculated respectively with Arcview 3.2. Climate indices include monthly precipitation, monthly maximum atmospheric temperature, monthly minimum atmospheric temperature, monthly average atmospheric temperature, monthly minimum relative humidity, monthly mean relative humidity and monthly sunlight hours. Hydrological indices include monthly surface runoff in Sangonghe basin and monthly mean water table in pluvial fan and alluvial plain. The correlation coefficients of NDVI with all climatic and hydrological factors are calculated with SPSS 10.0. The analysis shows that NDVI values in oasis have different rules of monthly variation from those in desert. Atmospheric temperature, groundwater table and precipitation are significantly correlative with NDVI in oasis, and irrigation is an important factor, which influences oasis NDVI. Correlation coefficients of desert sparse vegetation NDVI with oasis climatic and hydrological factors are insignificant and meaningless in ecological interpretation. In the process of analysis between NDVI and environmental factors in arid zones, the temporal and spatial scale must be strictly corresponding, oasis and desert must be considered respectively and conclusions from oasis NDVI are not adapted to the desert sparse vegetation. The contradictions in the conclusions of foregoing studies come from the confusion of application scope of their results, and the results of oasis NDVI can not represent the rules of the whole arid zone. |
| Keywords: | NDVI Climate factors Hydrological factors Temporal and spatial scale |
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