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| 张承地区植被指数时空演变特征及其与气候因子的关系 |
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邵雅琪1,2, 姜群鸥1,2, 胡中民3, 吴戈男4
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| (1.北京林业大学 水土保持学院, 北京 100083;2.北京林业大学 水土保持与荒漠化防治教育部重点实验室, 北京 100083;3.华南师范大学, 广州 510631;4.中国科学院大学, 北京 100049) |
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| 摘要: |
| 为研究对张承地区生态环境质量改善具有重要现实意义的植被动态变化及其与气候影响因素间的关系，本研究解析张承地区2000-2014年气候因子与植被指数（NDVI）的时空演变特征，进而揭示该区域气候因子与植被指数的相关关系。结果表明：1）2000-2014年张承地区NDVI整体呈现增长趋势，年际波动较大，季节差异和空间分异特征显著。2）对于气候要素，15年间光合有效辐射与气温呈下降趋势，而年降水量呈现出增长趋势，且具有明显季节差异。3）在季节尺度上，夏季NDVI与降水量的相关性最显著，而在冬季NDVI与气温和光合有效辐射的相关性更显著；在年际尺度上，NDVI与光合有效辐射相关性较低，但却与降水量呈显著正相关，与气温呈显著负相关。4）不同植被类型的NDVI与气候因子的相关程度存在差异，但对于同一植被类型，NDVI与降水量的相关性最高。这些研究结论将为张承地区应对气候变化、改善生态环境提供重要参考信息。 |
| 关键词: 归一化植被指数 气候影响 时空变化 |
| DOI：10.11841/j.issn.1007-4333.2018.07.11 |
| 投稿时间：2017-10-22 |
| 基金项目:国家科技重大专项项目（2017ZX07101004和2017ZX07108002）；中国科学院特色研究所培育项目；中央高校基本科研业务费专项（2017JC15）；中国博士后基金（2014M560110） |
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| Spatio-temporal evolution of the vegetation index and its relationship with climatic factors in the Zhangjiakou-Chengde Region |
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SHAO Yaqi1,2, JIANG Qun'ou1,2, HU Zhongmin3, WU Genan4
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| (1.College of Soil and Water Conservation, Beijing Forestry University, Beijing 100083, China;2.State Key Laboratory of Soil and Water Conservation and Desertification Combating of Ministry of Education, Beijing Forestry University, Beijing 100083, China;3.South China Normal University, Guangzhou 510631, China;4.University of Chinese Academy of Sciences, Beijing 100049, China) |
| Abstract: |
| Understanding the vegetation dynamics and its relationship with influencing factors is of great importance to enhancing the ecological environment quality of the Zhangjiakou-Chengde Region.This study explored the spatio-temporal evolution characteristics of climate factors and Normalized Difference Vegetation Index (NDVI),and then analyzed the correlation between them from 2000 to 2014.The results indicated that:1) The vegetation index in the Zhangjiakou-Chengde Region showed an increasing trend with a considerable inter-annual fluctuation as well as significant seasonal and spatial variation.2) The photosynthetic effective radiation and temperature experienced a decreasing trend in the past fifteen years,while the precipitation increased with obvious seasonal variation.3) At the seasonal scale,the correlation between NDVI and precipitation was the most remarkable in summer,however,NDVI is more closely related with the temperature and photosynthetically active radiation in winter.At the inter-annual scale,NDVI had a low correlation with photosynthetically active radiation,but it had a significant positive correlation with precipitation and a significant negative correlation with temperature.4) There were obvious differences among correlation degrees between NDVI of different vegetation types and the climate factors,while as for the same vegetation type,there is the highest correlation between precipitation and NDVI.All these results of this study can provide important reference information for responding the climate change and improving the ecological environment quality in the Zhangjiakou-Chengde Region. |
| Key words: NDVI climatic impact spatio-temporal variation |
