| 基于ICEEMDAN方法的黄土高原植被覆盖变化及其对气候变化的响应 |
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| 引用本文： | 孙倩倩,刘超,郑蓓君. 基于ICEEMDAN方法的黄土高原植被覆盖变化及其对气候变化的响应[J]. 应用生态学报, 2021, 32(6): 2129-2137. DOI: 10.13287/j.1001-9332.202106.011 |
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| 作者姓名： | 孙倩倩 刘超 郑蓓君 |
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| 作者单位： | 1.安徽理工大学空间信息与测绘工程学院, 安徽淮南 232001;2.河北工程大学矿业与测绘学院, 河北邯郸 056038;3.福州大学空间数据挖掘与信息共享教育部重点实验室, 福州 350108;4.数字中国研究院(福建), 福州 350108 |
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| 基金项目： | 国家自然科学基金项目(42071246)和河北省自然科学基金项目(E2020402006)资助 |
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| 摘 要： | 地理数据和遥感数据的长期序列中包含噪声和周期性波动信息。本研究基于ICEEMDAN方法对黄土高原1982—2015年归一化植被指数(NDVI)、降雨和温度进行逐像元分解,分解后得到的残差项减少了原始数据中的噪声和周期性波动,并利用残差项研究NDVI的变化趋势以及NDVI与气候因子之间的关系。结果表明: 1982—2015年,黄土高原NDVI以上升为主,残差项NDVI变化趋势的显著性(95.9%)大于原始NDVI变化趋势的显著性(72.3%),并且存在一定的空间差异性。温度和降雨的变化可以在很大程度上解释植被覆盖的变化。其中,温度与黄土高原NDVI之间呈极显著正相关的区域占83.7%,极显著负相关区域占13.9%;降雨与黄土高原NDVI之间呈极显著正相关的区域占54.4%,极显著负相关区域占37.2%。黄土高原植被对气候变化的响应存在明显的空间差异性,不同气候因子对不同植被覆盖类型的影响程度不同。总体上,黄土高原生长季不同植被与温度之间的相关性强于降水,温度是影响黄土高原植被覆盖变化的主要因素。
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| 关 键 词： | ICEEMDAN 黄土高原 归一化植被指数 降雨 温度 |
| 收稿时间： | 2020-11-15 |
Vegetation cover change and its response to climate change on the Loess Plateau,Northwest China based on ICEEMDAN method |
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| SUN Qian-qian,LIU Chao,ZHENG Bei-jun. Vegetation cover change and its response to climate change on the Loess Plateau,Northwest China based on ICEEMDAN method[J]. The journal of applied ecology, 2021, 32(6): 2129-2137. DOI: 10.13287/j.1001-9332.202106.011 |
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| Authors: | SUN Qian-qian LIU Chao ZHENG Bei-jun |
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| Affiliation: | 1.School of Spatial Informatics and Geomatics Engineering, Anhui University of Science and Technology, Huainan 232001, Anhui, China;2.School of Mining and Geomatics, Hebei University of Engineering, Handan 056038, Hebei, China;3.Key Laboratory of Spatial Data Mining and Information Sharing of Ministry of Education, Fuzhou University, Fuzhou 350108, China;4.Academy of Digital China (Fujian), Fuzhou 350108, China |
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| Abstract: | The long-term series of geographic data and remote sensing data contain noise and perio-dic fluctuation. We used the improved complete ensemble empirical mode decomposition with adaptive noise (ICEEMDAN) to decompose the data of the normalized difference vegetation index (NDVI), precipitation, and temperature from 1982 to 2015 on per-pixels in the Loess Pla-teau to obtain residuals. Using the residual with less noise and periodic fluctuations, we examined the changes of NDVI and the relationship between NDVI and climatic factors. The results showed that the spatial change trend of NDVI was mainly increasing from 1982 to 2015 in the Loess Plateau. The significance of the change trend of residual NDVI (95.9%) was greater than the original NDVI (72.3%), with spatial variations. Temperature and precipitation could largely explain the changes in vegetation coverage. The proportions of areas with extremely significant positive and negative correlations between temperature and NDVI on the Loess Plateau were 83.7% and 13.9%, respectively, while that between precipitation and NDVI were 54.4% and 37.2%, respectively. There were obvious spatial variations in the responses of vegetation to climate change on the Loess Plateau. Different climatic factors had different effects on different types of vegetation. In general, temperature had stronger correlation with different vegetation than precipitation. Therefore, temperature was the main driving factor for the changes of vegetation cover in the Loess Plateau. |
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| Keywords: | ICEEMDAN Loess Plateau NDVI precipitation temperature |
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