| 植被NDVI对城市扩展及气候变化的响应——以西安及其附近区域为例 |
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| 引用本文： | 王涛,李贝贝,裴春营.植被NDVI对城市扩展及气候变化的响应——以西安及其附近区域为例[J].干旱区地理,2017,40(2):388-396. |
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| 作者姓名： | 王涛 李贝贝 裴春营 |
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| 作者单位： | 1. 西安科技大学测绘科学与技术学院, 陕西 西安 710054;
2. 西北大学城市与环境学院, 陕西 西安 710127;
3. 黄土高原土壤侵蚀与旱地农业国家重点实验室, 中国科学院水利部水土保持研究所, 陕西 杨凌 712100 |
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| 基金项目： | 国家自然科学基金项目（41271103）；黄土高原土壤侵蚀与旱地农业国家重点实验室开放基金项目（A314021402-1616） |
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| 摘 要： | 植被 NDVI 对城市扩展及气候变化响应研究，对于科学评估区域生态环境变化及调整与约束人类活动具有重要理论和现实意义。以西安及其附近区域为例，基于区域土地利用、MODIS NDVI、气温和降水数据，分析了植被 NDVI 对城市扩展及气候变化的响应，结果表明：（1）2000-2014 年研究区植被 NDVI 变化过程划分为2000-2007 年的显著增加阶段和2007-2014 年的显著减少阶段，前者主要分布于区域北部黄土高原、南部秦岭北坡，后者主要分布于区域中部关中平原尤其是西安及其附近区域。（2）2000-2015 年研究区建设用地增加1 428.27 km2 ，建设用地增加区域植被 NDVI 呈显著减少趋势。（3）研究区植被 NDVI 与年降水量的相关性高于年平均气温，同时西安及其以南区域植被 NDVI 与年平均气温、年降水量均呈负相关关系，反映出城市扩展等人类活动对植被 NDVI 变化的影响超过了气候变化的影响。研究结果表明植被 NDVI 总体受气候变化控制，但局部受人类活动影响更为严重，并且植被 NDVI 对气候变化的响应表现出波动性，而对城市扩展表现出线性减少趋势性，为通过植被 NDVI 变化区分自然因素与人为因素对环境影响提供了可能。
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| 关 键 词： | 人类活动 气候变化 植被覆盖 定量分析 西安 |
| 收稿时间： | 2016-10-09 |
Impact of urban expansion and climate change on vegetation NDVI: a case of Xi'an City and its nearby area |
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| WANG Tao,LI Bei-bei,PEI Chun-ying.Impact of urban expansion and climate change on vegetation NDVI: a case of Xi'an City and its nearby area[J].Arid Land Geography,2017,40(2):388-396. |
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| Authors: | WANG Tao LI Bei-bei PEI Chun-ying |
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| Institution: | 1. College of Geomatics, Xi’an University of Science and Technology, Xi’an 710054, Shaanxi, China;
2. College of Urban and Environment, Northwest University, Xi’an 710127, Shaanxi, China;
3. State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Institute of Water and Soil Conservation, Chinese Academy of Sciences and Ministry of Water Resources, Yangling 712100, Shaanxi, China |
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| Abstract: | Urban expansion reflecting human activities and climate change are the two main driving forces of global and regional ecological environmental change. As an important indicator of characterizing vegetation ecology in global land surface, vegetation NDVI provides a probability to study the impact of urban expansion and climate change on regional ecological environmental change. Compared with the previous independent analysis of the impact of urban expansion or climate change on vegetation NDVI, this paper will analyze the impact of urban expansion and climate change on vegetation NDVI together, and also analyze the difference of the two driving forces, which may provide a probability to quantitatively distinguish the effects of climate change and human activities. Taking Xi'an City and its nearby area for example, the impact of urban expansion and climate change on vegetation NDVI was analyzed based on the land use data, MODIS NDVI, yearly temperature and precipitation data in 12 meteorological stations, and the methods including linear trend analysis, correlation coefficient, partial correlation coefficient and t-test. Results show as follows:(1)The process of vegetation NDVI change was divided into 2 stages, 2000-2007 and 2007-2014. The former stage showed significant linear increasing trend, which was mainly distributed in Loess Plateau area in northern study area and northern Qinling in southern study area. The latter stage showed significant linear decreasing trend, which was mainly distributed in Guanzhong plain, especially in Xi'an City and its nearby area.(2)Urban area had increased 1 428.27 km2, which was mainly from 2010 to 2015 in the study area. Vegetation NDVI in the area of urban expansion showed a significant linear decreasing trend(P<0.05).(3)Overall, the correlation between vegetation NDVI and precipitation was higher than that between vegetation NDVI and temperature. At the same time, negative correlation between vegetation NDVI and temperature, precipitation was distributed in Xi'an City and its nearby area, which indicated that the impact of urban expansion was higher than that of climate change on vegetation NDVI. The conclusions are that vegetation NDVI was controlled by climate change overall, but was influenced by urban expansion more seriously in local area; the response of vegetation NDVI to climate change fluctuated, and the vegetation NDVI showed linear decreasing trend to urban expansion. The conclusion of this research may have some limitations and needs to further study the relationship between vegetation NDVI and climate change, human activities at large scale and using long time-series data, to obtain a general conclusion. |
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| Keywords: | human activities climate change vegetation cover Xi'an City |
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