Spatiotemporal Variation in Driving Factors of Vegetation Dynamics in the Yellow River Delta Estuarine Wetlands from 2000 to 2020
Date
2023
Authors
Niu, Zhongen
Si, Bing Cheng
Li, Dong
Zhao, Ying
Hou, Xiyong
Li, Linlin
Wang, Bin
Song, Bing
Zhang, Mengyu
Li, Xiyu
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MDPI
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Article
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Abstract
Previous studies of vegetation dynamics in the Yellow River Delta (YRD) predominantly relied on sparse time series or coarse-resolution images, which not only overlooked the rapid and spatially heterogeneous changes, but also limited our understanding of driving mechanisms. Here, employing spatiotemporal data fusion methods, we constructed a novel fused enhanced vegetation index (EVI) dataset with a high spatiotemporal resolution (30-meter and 8-day resolution) for the YRD from 2000 to 2020, and we analyzed the vegetation variations and their driving factors within and outside the YRD Nation Natural Reserve (YRDNRR). The fused EVI effectively captured spatiotemporal vegetation dynamics. Notably, within the YRDNRR core area, the fused EVI showed no significant trend before 2010, while a significant increase emerged post-2010, with an annual growth of 7%, the invasion of Spartina alterniflora explained 78% of this EVI increment. In the YRDNRR experimental area, the fused EVI exhibited a distinct interannual trend, which was characterized by an initial increase (2000–2006, p < 0.01), followed by a subsequent decrease (2006–2011, p < 0.01) and, ultimately, a renewed increase (2011–2020, p > 0.05); the dynamics of the fused EVI were mainly affected by the spring runoff (R2 = 0.71), while in years with lower runoff, it was also affected by the spring precipitation (R2 = 0.70). Outside of the protected area, the fused EVI demonstrated a substantial increase from 2000 to 2010 due to agricultural land expansion and human management practices, followed by stabilization post-2010. These findings enhance our comprehension of intricate vegetation dynamics in the YRD, holding significant relevance in terms of wetland preservation and management.
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© 2023 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https:// creativecommons.org/licenses/by/ 4.0/).
Keywords
vegetation variations, spatiotemporal heterogeneity, remote sensing, fusion, Yellow River Delta
Citation
Niu, Z.; Si, B.; Li, D.; Zhao, Y.; Hou, X.; Li, L.;Wang, B.; Song, B.; Zhang, M.; Li, X.; et al. Spatiotemporal Variation in Driving Factors of Vegetation Dynamics in the Yellow River Delta Estuarine Wetlands from 2000 to 2020. Remote Sens. 2023, 15, 4332. https:// doi.org/10.3390/rs15174332
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Citation
Niu, Z.; Si, B.; Li, D.; Zhao, Y.; Hou, X.; Li, L.;Wang, B.; Song, B.; Zhang, M.; Li, X.; et al. Spatiotemporal Variation in Driving Factors of Vegetation Dynamics in the Yellow River Delta Estuarine Wetlands from 2000 to 2020. Remote Sens. 2023, 15, 4332. https:// doi.org/10.3390/rs15174332
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DOI
10.3390/rs15174332