| 气候变化和人类活动对东部沿海地区NDVI变化的影响分析 |
| 摘要点击 1249 全文点击 461 投稿时间：2022-07-04 修订日期：2022-08-26 |
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| 中文关键词 归一化植被指数(NDVI) 影响因素 残差分析 阶段性 异质性 |
| 英文关键词 normalized difference vegetation index (NDVI) impact factors residual analysis different periods heterogeneity |
| 作者 | 单位 | E-mail | | 金岩松 | 青岛农业大学资源与环境学院, 青岛 266109 | jys990817@163.com | | 金凯 | 青岛农业大学资源与环境学院, 青岛 266109
中国科学院水利部水土保持研究所, 黄土高原土壤侵蚀与旱地农业国家重点实验室, 杨凌 712100 | jinkai-2014@outlook.com | | 王飞 | 中国科学院水利部水土保持研究所, 黄土高原土壤侵蚀与旱地农业国家重点实验室, 杨凌 712100
西北农林科技大学水土保持研究所, 杨凌 712100
中国科学院大学, 北京 100049 | | | 刘春霞 | 青岛农业大学资源与环境学院, 青岛 266109 | | | 秦鹏 | 青岛农业大学资源与环境学院, 青岛 266109 | | | 宗全利 | 青岛农业大学资源与环境学院, 青岛 266109 | | | 刘佩茹 | 青岛农业大学资源与环境学院, 青岛 266109 | | | 陈明利 | 青岛农业大学资源与环境学院, 青岛 266109 | |
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| 中文摘要 |
| 植被是陆地生态系统的重要组成部分,特别是在人类活动密集地区,良好的植被覆盖对于维持区域生态环境稳定、增进居民生活福祉和促进社会经济可持续发展意义重大.基于归一化植被指数(NDVI)、气温、降水和太阳辐射数据,采用趋势分析、偏相关分析和残差分析等方法,探究了1982~2019年中国东部沿海地区NDVI时空变化特征及其与气候因子的关系,评估了气候因素和人类活动等非气候因素对NDVI变化的影响.结果表明:①1982~2019年研究区NDVI变化趋势具有明显区域性、阶段性和季节性差异,就区域平均而言,2000年以前(第一阶段)的生长季NDVI比2001年以后(第二阶段)增加更快,而两阶段春季NDVI增加速率均为各季节最快;②同一阶段NDVI与各气候因子的关系在不同季节存在差异,而同一季节NDVI的主要气候控制因子在不同阶段也不一致,并且NDVI与气候因子的关系具有很大空间差异.总体上,1982~2019年研究区生长季NDVI的增加与气温的持续上升关系紧密,第二阶段降水和太阳辐射的增加也产生了积极作用;③相比于人类活动等非气候因素的影响,气候变化对近38年来研究区生长季NDVI变化的影响更大;人类活动等非气候因素和气候变化分别主导了第一和第二阶段的NDVI变化.建议应进一步加强对不同时期NDVI变化驱动因素的探讨,以加深对陆地生态系统变化的认识. |
| 英文摘要 |
| Based on the datasets of normalized difference vegetation index (NDVI), temperature, precipitation, and solar radiation and the methods of trend, partial correlation, and residual analyses, this study explored the spatiotemporal variation in NDVI and its response to climate change from 1982 to 2019 in eastern coastal areas of China. Then, the effects of climate change and non-climatic factors (e.g., human activities) on NDVI trends were analyzed. The results showed that:① the NDVI trend varied greatly in different regions, stages, and seasons. On average, the growing season NDVI increased faster during 1982-2000 (stage I) than that during 2001-2019 (stage Ⅱ) in the study area. Moreover, NDVI in spring showed a more rapid increase than that in other seasons in both stages. ② For a given stage, the relationships between NDVI and each climatic factor varied in different seasons. For a given season, the major climatic factors associated with NDVI change were different between the two stages. The relationships between NDVI and each climatic factor showed great spatial differences in the study period. In general, the increase in growing season NDVI in the study area from 1982 to 2019 was closely related to the rapid warming. The increase in precipitation and solar radiation in stage Ⅱ also played a positive role. ③ In the past 38 years, climate change played a greater role in the change in growing season NDVI than non-climatic factors, including human activities. Whereas non-climatic factors dominated the increase in growing season NDVI during stage I, climate change played a major role during stage Ⅱ. We suggest that more attention should be paid to the impacts of various factors on vegetation cover variation during different periods to promote the understanding of terrestrial ecosystem changes. |
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