Knowledge Resource Center for Ecological Environment in Arid Area
| 中国植被季节变化对气候的响应及其年际差异分析 | |
| 谢力 | |
| 出版年 | 1999 |
| 学位类型 | 硕士 |
| 导师 | 符淙斌 |
| 学位授予单位 | 中国科学院大气物理研究所 |
| 中文摘要 | 本文利用1982年到1993年逐年逐旬（准10天）归一化植指被数（ND VI）数据，通过经验正交函数分解的方法（EOF）分析了中国植被覆盖变化的时间、空间特征及其与温度、降水气候因子的定量关系以及它们的年际差异。主要结果是：·中国不同区域植被的季节变化受所在区域气候影响显著：东部季风区植被生长随东亚季风的推移，呈明显的季节变化；云贵高原地区植被受西南季风气候控制，4－7月植被处于年低值期；中国西部植被受季风影响很小，植被季节变化不显著。·影响中国植被空间分布的主要气候驱动因子为降水；温度对中国植被季节生长变化起主导作用。·中国植被季节生长与温度存在同期相关；与降水存在滞后相关，滞后时间平均为2旬，各年存在差异，最大可达4旬。·中国植被生长季的开始和结束都具有突变性质，但突变发生的时间各年有所不同，最大可达第12旬。突变发生的时间均滞后温度、降水的季节突变发生期，滞后旬数各年稍有差异。·中国，NDVI与温度存在e指数关系，这种关系说明当温度低于某临介值时，NDVI的变化不显著，超过此值，NDVI随温度迅速增加而加速增长；NDVI与降水存在幂指数关系，这种关系可能反映了当降水量未超过临界值时，NDVI随降水量增加而增加，但当降水量达到或超过临界值时，降水量不再是植被增长的控制因子。·位于北方半干旱区附近的植被过渡带是中国植被分布的一个主要特征，它是东亚夏季风的北界位置，随夏季风强弱有所偏移，但偏移幅度不显著。 |
| 英文摘要 | This article presents the results of the tempo-spatial characteristics of the vegetation and their climates responses at seasonal and inter-annual scale in China. The data for 10 days of Normalized Difference Vegetation Index (NDVI) for the years 1982 to 1993 have been analyzed. We have evaluated NDVI-temperature and NDVI-rainfall relationships by using the Empirical Orthogonal Function (EOF) analysis. The main conclusions of our research are as follows: 1. The seasonal variability of vegetation in different regions of China is greatly influenced by the regional climate. In the monsoon region of East China, the growth of vegetation shows evident seasonal variability along with the process of the East Asia monsoon. In the Yun Gui Plateau, the vegetation is controlled by the southwest monsoon climate, and the vegetation from April to July is in a period of low values of the year. In West China, the vegetation is less influenced by monsoon, therefore, the seasonal variability of vegetation is not evident. 2. The main climatic driving factor influencing the spatial distribution of vegetation in China is rainfall and the temperature is a leading factor causing the seasonal variability of vegetation growth in China. 3. The seasonal growth of vegetation in Chins responds synchronically to the temperature, and lags 20 days to the rainfall on the average, with variance from 1982-1993. The biggest variance could amount to 40 days. 4. The beginning and ending of the growing season for vegetation in China are characteristic of abrupt change. However, the time that the abrupt change happens varies from year to year, and it lags to the temperature and rainfall. 5. In China, there is exponential of 'e' relationship between NDVI and temperature. When the temperature is lower than some threshold value, the change of NDVI is not evident. When the temperature is above the value, the NDVI increases greatly with a speed greater than the increasing speed of temperature. In the meantime, the NDVI and rainfall have a power exponent relationship. This probably is reflected by the following facts. When the rainfall does not exceed some threshold value, the NDVI increases along with the increase of rainfall. But when the rainfall reaches or exceeds the threshold value, the rainfall no longer acts as the controlling factor of vegetation increase. 6. One character of the vegetation distribution in China is the existence of the vegetation transitional zone, which locates near the semi-arid zone in North Chain. The transitional zone is the northern limit of the East Asia summer monsoon, and the location of the transitional zone shows a little deviation along with the strength of the East Asia summer monsoon. |
| 中文关键词 | 归一化植被指数 ; 对气候的响应 ; 季节变化 ; 年际差异 |
| 英文关键词 | normalized difference vegetation index responses to climate seasonal change inter-annual variability |
| 语种 | 中文 |
| 国家 | 中国 |
| 来源机构 | 中国科学院大气物理研究所 |
| 资源类型 | 学位论文 |
| 条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/286226 |
| 推荐引用方式 GB/T 7714 | 谢力. 中国植被季节变化对气候的响应及其年际差异分析[D]. 中国科学院大气物理研究所,1999. |
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